US20110244012A1 - Fungicide, photo catalytic composite material, adsorbent, and depurative - Google Patents

Fungicide, photo catalytic composite material, adsorbent, and depurative Download PDF

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US20110244012A1
US20110244012A1 US13/053,558 US201113053558A US2011244012A1 US 20110244012 A1 US20110244012 A1 US 20110244012A1 US 201113053558 A US201113053558 A US 201113053558A US 2011244012 A1 US2011244012 A1 US 2011244012A1
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Prior art keywords
porous carbon
carbon material
group
fine pore
equal
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US13/053,558
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Inventor
Hironori Iida
Shun Yamanoi
Machiko Minatoya
Seiichiro Tabata
Shinichiro Yamada
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Sony Corp
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Sony Corp
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Assigned to SONY CORPORATION reassignment SONY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TABATA, SEIICHIRO, YAMADA, SHINICHIRO, MINATOYA, MACHIKO, IIDA, HIRONORI, YAMANOI, SHUN
Publication of US20110244012A1 publication Critical patent/US20110244012A1/en
Priority to US14/591,666 priority Critical patent/US20150118477A1/en
Priority to US16/823,697 priority patent/US11707068B2/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • A01N59/16—Heavy metals; Compounds thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/00—Treatment of water, waste water, or sewage
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    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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Definitions

  • the present invention relates to a fungicide which is made of a porous carbon material complex, a photo catalytic composite material, an adsorbent, and a depurative.
  • a functional material in which a physical property and a physicochemical property such as a light absorption property, and an absorptive capacity for a specific substance are given to a porous material is an interesting material because the functional material has both a high specific surface area, and a property of matter which the functional material has.
  • alumina, carbon, silica or the like can be given as the porous material.
  • fine particles or thin films made of metals such as Fe, Co, Ni, Au, Ag, Pt, or Cu, alloys thereof, oxides such as Fe 2 O 3 , Fe 3 O 4 , TiO 2 or ZnO 2 , compounds such as CdS, CdSe, ZnS, CaCO 3 or Ca(CH 3 COO) 2 , or the like, or polymeric films or a monomolecular films containing therein many amino groups can be given as the functional material having the light absorption property, and the absorptive capacity for the specific substance.
  • a fungicide for example, can be given as a usage of such a functional material.
  • Components such as fatty acid and glycerin contained in sweat are decomposed and altered into a lower fatty acid and the like, thereby generating an armpit odor.
  • a zeolite containing therein silver (Ag) has been offered commercially.
  • the zeolite containing therein Ag is such that Ag ions supported by the zeolite contacts a normal inhavitant (such as Staphylococcus epidermidis or diphtheroid fungus) to impede the action of the fungus, thereby cutting out the source of aroma.
  • the odor eliminating for eliminating the aroma generated, and the sterilization of the fungus which decompose and alter the components of the sweat are important in order to prevent the armpit odor from being generated.
  • the Ag containing zeolite described above has the sufficient property in terms of the odor eliminating and the sterilization.
  • the functional material, having the light absorption property, in which a titanium oxide (TiO 2 ) is supported by the porous material involves such a problem that the functional material concerned hardly absorbs a light in a visible light region and thus does not show the high decomposition reaction.
  • the porous carbon material as the case may involve such a problem that the porous carbon material concerned hardly adsorbs the metal.
  • the present invention has been made in order to solve the problems described above, and it is therefore desirable to provide a fungicide which is made of a porous carbon material and which has excellent odor eliminating and sterilization effects, a photo catalytic composite material which absorbs a light in a visible light region and shows a decomposition reaction, an adsorbent which adsorbs a metal, and a depurative.
  • a fungicide including: a porous carbon material; and a silver member (silver material) adhered to the porous carbon material, in which a value of a specific surface area based on a nitrogen BET, namely Brunauer, Emmett, and Teller method is equal to or larger than 10 m 2 /g, and a volume of a fine pore based on a BJH, namely Barrett, Joyner, and Halenda method and an MP, namely Micro Pore method is equal to or larger than 0.1 cm 3 /g.
  • a photo catalytic composite material including: a porous carbon material; and a photo catalytic material adhered to the porous carbon material, in which a value of a specific surface area based on a nitrogen BET method is equal to or larger than 10 m 2 /g, and a volume of a fine pore based on a BJH method and an MP method is equal to or larger than 0.1 cm 3 /g; and the photo catalytic material is composed of a titanium oxide doped either with a cation or with an anion.
  • an adsorbent or a depurative including: a porous carbon material; and an organic material adhered to the porous carbon material, in which a value of a specific surface area based on a nitrogen BET method is equal to or larger than 10 m 2 /g, and a volume of a fine pore based on a BJH method and an MP method is equal to or larger than 0.1 cm 3 /g; and the organic material adsorbs a metal.
  • the fungicide, the photo catalytic composite material, the adsorbent, and the depurative of the present invention will be generically hereinafter referred to as “a porous carbon material complex of the present invention” in some cases.
  • the silver member, the photo catalytic material, and the organic material each of which is to be adhered to the porous carbon material will be generically hereinafter referred to as “a functional material” in some cases.
  • the porous carbon material composing the fungicide, the photo catalytic composite material, the adsorbent, and the depurative of the embodiment of the present invention will be hereinafter referred to as “the porous carbon material in the embodiment of the present invention” in some cases.
  • the value of the specific surface area based on the nitrogen BET method is equal to or larger than 10 m 2 /g and a volume of a fine pore based on a BJH method and an MP method is equal to or larger than 0.1 cm 3 /g.
  • a porous carbon material is adhered to such a porous carbon material, thereby making it possible to increase an amount of functional material adhered per unit weight of the porous carbon material. Also, it is possible to obtain the porous carbon material complex having the high property and the high functionality.
  • the high adsorption property and the high sterilization can be obtained because the silver member is adhered to the porous carbon material.
  • the fungicide can also be utilized as a deodorant product, a deodorizer, an antimicrobial agent or preserving agent.
  • the photo catalytic composite material of the embodiment of the present invention is composed of the titanium oxide doped either with the cation or with the anion. Therefore, the photo catalytic composite material of the embodiment of the present invention can effectively absorb the visible light, and thus is given a charge separation property, a visible light absorption property, an ultraviolet ray absorption property, and a catalyst property.
  • the photo catalytic composite material of the embodiment of the present invention can be applied as a harmful material decomposition agent, and a harmful material remover which can be semi-permanently used due to the photo catalytic effect.
  • the metal a metal atom or a metal ion
  • the metal can be effectively adsorbed because the organic material is adhered (supported, adsorbed or bonded) to the porous carbon material.
  • the porous carbon material of the embodiment of the present invention is regulated in its volume of the fine pore, and has a fine pore in a meso region (in the range of 2 to 50 nm) which cannot be realized in existing activated carbon in addition to the fine pore in a micro region ( ⁇ 2 nm) which the existing activated carbon has.
  • the fungicide of the embodiment of the present invention shows the high adsorption capacity for the molecules as the cause of the aroma due to such a fine pore size.
  • the funguses are adsorbed by a macro fine pore (>50 nm) having the porous carbon material and dispersed, thereby also suppressing the growth of the funguses.
  • the photo catalytic material of the embodiment of the present invention can be very effectively adhered to the porous carbon material based on the fine pore size as described above, and thus the decomposition based on the photo catalytic action can be effectively caused.
  • the adsorbent and the depurative of the embodiment of the present invention as the material for the environment depuration, it is expected that the fine pore size as described above effectively act on the adsorption of the harmful materials.
  • the photo catalytic material or the organic material can be very effectively adhered to the porous carbon material, and thus the decomposition and detoxification of the harmful materials can be effectively caused.
  • the diffusion of the harmful materials in the inside of the porous carbon material is promoted, which results in that the decomposition can be more effectively caused, and the depuration of the water, and the depuration of the air can be very effectively carried out.
  • FIG. 1 is electron microscope images of fungicides of Example 1-A and Example 1-B, and a specimen of Comparative Example 1;
  • FIGS. 2A to 2C , and 2 D are charts of X-ray diffraction results of the fungicides of Example 1-A and Example 1-B, and the specimen of Comparative Example 1 each obtained by using a powder X-ray diffractometry, and standard data of Ag in an X-ray diffraction analysis, respectively;
  • FIGS. 3A and 3B are graphs representing a fine pore distribution of meso fine pores, and a fine pore distribution of micro fine pores in the fungicides of Example 1-A and Example 1-B, and the specimen of Comparative Example 1, respectively;
  • FIG. 4 is a graph representing measurement results of fine pore diameter distributions about Example 1-A, Example 1-B and Comparative Example 1 which are obtained by using a non localized density functional theory method;
  • FIG. 5 is a view conceptually showing a state in which a photo catalytic material absorbs an energy of a light in a photo catalytic composite material of Example 2;
  • FIG. 6 is a graph representing light absorption characteristics of TiO 2 ;
  • FIG. 7 is a graph representing results of a measurement of a fine pore (meso fine pore) distribution in specimens of Example 2-A and Example 2-B;
  • FIG. 8 is a graph representing measurement results of fine pore diameter distributions about Example 2-A and Example 2-B which are obtained by using the non localized density functional theory method;
  • FIG. 9 is a graph representing a state in which each of the photo catalytic composite material of Example 2-A, and a specimen of Comparative Example 2 decomposes a tannic acid solution with time;
  • FIG. 10 is a graph representing a state in which each of the photo catalytic composite material of Example 2-B, and a specimen of Comparative Example 2 decomposes a methyl orange solution with time;
  • FIG. 11A is a graph representing results of a decomposition test about micro cystine based on a specimen of Example 2-B and commercially available porous carbon
  • FIG. 11B is a conceptual view explaining decomposition of micro cystine in the specimen of Example 2-B;
  • FIG. 12 is a view schematically showing a state in which polyethylene imine as an organic material is adhered to the porous carbon material in an adsorbent and a depurative of Example 3;
  • FIG. 13 is a view schematically showing a state in which the adsorbent and the depurative of Example 3, an ion exchange capacity can be enhanced by carrying out a treatment by using FeCl 3 .6H 2 O;
  • FIG. 14 is a graph representing a state in which the adsorbent and the depurative of Examples 3 and activated carbon of Comparative Example 3 adsorb potassium chromate;
  • FIG. 15 is a view schematically showing a state in which the adsorbent and the depurative of Examples 3 adsorb a chromate ion;
  • FIG. 16 is a graph representing measurement results of fine pore diameter distributions about Example 3 and Comparative Example 3 which are obtained by using the non localized density functional theory method.
  • Example 1 (Fungicide of the Embodiment of the Present Invention)
  • a silver member in a fungicide of an embodiment of the present invention, can be composed of either an ion containing therein a silver ion; a particle containing therein silver, a silver alloy or a silver ion; or a thin film containing therein silver, the silver alloy or the silver ion.
  • an alloy of silver and ruthenium, an alloy of silver and rhodium, an alloy of silver and palladium, an alloy of silver and gold, an alloy of silver and platinum, an alloy of silver and cobalt, an alloy of silver and nickel, or an alloy of silver and copper can be exemplified as the silver alloy.
  • a form of silver nitrate, a form of silver chloride, or a form of silver sulfate can be exemplified as the silver ion.
  • a method such as impregnation in a silver salt aqueous solution, or reduction and precipitation of silver by using a reducing agent can be exemplified as a method of adhering the silver member to a porous carbon material.
  • a photo catalytic material can have a constitution that an energy of a light having a wavelength of 200 to 600 nm is absorbed.
  • the photo catalytic material is composed of a titanium oxide doped either with a cation (positive ion) or with an anion (negative ion).
  • a chromium ion, an iron ion, a silver ion, a platinum ion, a copper ion, a tungsten ion, or, a cobalt ion or a nickel ion can be exemplified as a concrete example of the cation.
  • a nitrogen ion, a carbon ion, or a sulfur ion can be exemplified as a concrete example of the anion.
  • Adhesion in a state of a fine particle, or adhesion in a state of a thin film can be exemplified as a form of the adhesion of the titanium oxide to the porous carbon material. It is noted that a zinc oxide (ZnO) can also be used instead of using the titanium oxide.
  • a depurative can be obtained from the photo catalytic composite material of the embodiment of the present invention.
  • a visible light has to be radiated to the photo catalytic composite material of the embodiment of the present invention. Harmful substances each existing either in water or in air can be given as the harmful substances. Specifically, it is possible to exemplify a micro-cystine class or substances as sources of various kinds of virus or allergy.
  • the depurative functions either as a depurative for water, or as a depurative for air, and thus, for example, can be applied as a filter of an air purification apparatus.
  • the photo catalytic composite material can be used by subjecting a surface thereof either to a hydrocolloid treatment or to a hydrophobic treatment.
  • an organic material having at least one kind of group selected from the group consisting of a phenol group, a carboxyl group, an amino group, a thiol group, a ketone group, a phosphoric acid group, an alkyl group, an ether group, and a thionyl group can be given as the organic material.
  • a phenol group a carboxyl group
  • an amino group a thiol group
  • a ketone group a phosphoric acid group
  • an alkyl group an ether group
  • a thionyl group a phosphoric acid group
  • chromium, mercury, arsenic, lead, cadmium, tin, copper, zinc, lithium, beryllium, boron, titanium, vanadium, manganese, cobalt, nickel, gallium, germanium, selenium, rubidium, strontium, zirconium, niobium, molybdenum, palladium, indium, antimony, tellurium, cesium, barium, hafnium, tantalum, tungsten, rhenium, platinum, thallium, bismuth, scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, or lutetium can be given as the metal (including a metal atom and a metal ion).
  • a method of forming C—C bond, C—N bond, CO bond or the like between the porous carbon material and the organic molecule, a method of coating SiO 2 and bonding the organic material to the porous carbon material by silane coupling, or a mixing and stirring method, for example, can be exemplified as the method of adhering (including the concept such as support, adsorption, bonding and surface modification) the organic material to the porous carbon material.
  • the adhesion in a layer-like form, or the adhesion in an island-like form can be exemplified as a form of the adhesion of the organic material to the porous carbon material.
  • each of the adsorbent and the depurative of the embodiment of the present invention can enhance the negative ion exchange capacity or the positive ion exchange capacity, or can adsorb the metals (such as the metal atom and the metal ion) having various kinds of forms by changing a metal coordination or the like.
  • each of the adsorbent and the depurative of the embodiment of the present invention can enhance the dispersibility either to a solvent or to the base.
  • each of the adsorbent and the depurative of the embodiment of the present invention functions as a depurative for water and, for example, can also be applied to a filter.
  • the use in the sheet-like form, the use in the state of being filled either in the column or in the cartridge, the use in the state of being formed into the desired shape by using the binder or the like, or the use in the powder form can be exemplified as the use form.
  • each of the adsorbent and the depurative the embodiment of the present invention can also absorb the metal contained in the gas such as smoke.
  • the porous carbon material has the plant-derived material in which a content rate of silicon (Si) is equal to or larger than 5 wt % as the raw material.
  • the content rate of silicon (Si) is equal to or smaller than 5 wt %, preferably is equal to or smaller than 3 wt %, and more preferably is equal to or smaller than 1 wt %.
  • the resulting material is treated by using either an acid or an alkali, thereby obtaining the porous carbon material.
  • the functional material is adhered to the resulting porous material, thereby making it possible to manufacture the porous carbon material complex of the embodiment of the present invention.
  • a method of manufacturing such a porous carbon material in the embodiment of the present invention hereinafter simply referred to as “a method of manufacturing the porous carbon material” in some cases
  • a material which is obtained by carbonizing the plant-derived material at 400 to 1,400° C. before being treated by either using an acid or using an alkali is referred to either as “a porous carbon material precursor” or as “a carbonaceous material.”
  • the plant-derived material may be subjected to the heat treatment (preliminary carbonizing treatment) at the lower temperature (for example, in the range of 400 to 700° C.) than that for the carbonization in a state in which oxygen is cut off.
  • the heat treatment preliminary carbonizing treatment
  • a tar component which will be generated in a process of carbonization can be extracted.
  • the tar component which will be generated in the process of the carbonization can be either reduced or removed away.
  • an atmosphere of inactive gas such as a nitrogen gas or argon gas is prepared, or a vacuum atmosphere is prepared, or the plant-derived material is set in a sort of escalloped state, thereby making it possible to attain the state in which oxygen is cut off.
  • the plant-derived material may be dipped in alcohol (such as methyl alcohol, ethyl alcohol or isopropyl alcohol).
  • alcohol such as methyl alcohol, ethyl alcohol or isopropyl alcohol.
  • the preliminary carbonizing treatment may be carried out.
  • a plant which generates a large amount of wood vinegar (such as tar or light oil content), for example, can be given as the material which is preferably subjected to the heat treatment in the inactive gas.
  • a seaweed which contains therein a large amount of iodine or various minerals for example, can be given as the material which is preferably subjected to the pretreatment using the alcohol.
  • the plant-derived material is carbonized at 400 to 1,400° C.
  • the carbonization generally means that the organic material (the porous carbon material in the embodiment of the present invention) is subjected to the heat treatment to be transformed into the carbonaceous material (for example, refer to JIS M0104-1984).
  • an atmosphere in which oxygen is cut off can be given as the atmosphere for the carbonization.
  • the vacuum atmosphere the atmosphere of the inactive gas such as nitrogen gas or argon gas, or the atmosphere in which the plant-derived material is made to undergo the sort of escalloped state.
  • 1° C./minute or more preferably, 3° C./minute or more, or more preferably, 5° C./minute or more can be given as a rate of temperature rise in such an atmosphere until the carbonization temperature is reached.
  • 10 hours, preferably 7 hours, and more preferably 5 hours can be given as an upper limit of the carbonization time
  • the present invention is by no means limited thereto.
  • a lower limit of the carbonization time has to be set as a time for which the plant-derived material is reliably carbonized.
  • the plant-derived material may be crushed to pieces each having a desired particle size as may be necessary, or may be classified. The plant-derived material may be previously cleaned.
  • the resulting porous carbon material precursor or porous carbon material may be crushed to pieces each having a desired particle size as may be necessary, or may be classified.
  • the porous carbon material after completion of the activation treatment may be crushed to pieces each having a desired particle size as may be necessary, or may be classified.
  • a sterilization treatment may be carried out for the porous carbon material which is finally obtained.
  • a type, a constitution and a construction of a furnace which is used for the carbonization That is to say, a continuous furnace can be used, or a batch furnace can also be used.
  • the gas activation method means a method in which oxygen, steam, carbon dioxide gas, air or the like is used as an activator, and the porous carbon material is heated at 700 to 1,400° C., preferably at 700 to 1,000° C., and more preferably at 800 to 1,000° C. for several tens of minutes to several hours, whereby a fine structure is developed by volatile components and carbon molecules in the porous carbon material.
  • the heating temperature may be suitably selected in accordance with a kind of plant-derived material, a kind of gas, a concentration of gas, and the like.
  • the drug activation method means a method in which the plant-derived material is activated by using zinc chloride, iron chloride, calcium phosphate, calcium hydroxide, magnesium carbonate, kalium carbonate, a sulfuric acid, or the like instead of using oxygen or steam used in the gas activation method, is rinsed by using a hydrochloric acid, is adjusted in pH by using an alkaline aqueous solution, and is then dried.
  • the silicon components in the plant-derived material after completion of the carbonization are removed away by carrying out the treatment using either the acid or the alkali.
  • silicon oxides such as a silicon dioxide, oxidized silicon, and a silicon oxide salt can be given as the silicon components.
  • the silicon components in the plant-derived material after completion of the carbonization are removed away in the manner as described above, whereby it is possible to obtain the porous carbon material having a high specific surface area, and it is also possible to increase an amount of functional material adhered per unit weight of the porous carbon material.
  • the silicon components contained in the plant-derived material after completion of the carbonization may be removed away based on a dry etching method as the case may be.
  • the plant-derived material containing therein silicon (Si) is used as the raw material.
  • the plant-derived material is transformed either into a porous carbon material precursor or into a carbonaceous material, the plant-derived material is carbonized at a high temperature (for example, in the range of 400 to 1,400° C.), whereby silicon contained in the plant-derived material does not turn into a silicon carbide (SiC), but exists as silicon components (silicon oxides) such as a silicon dioxide (SiO x ), a silicon oxide and a silicon oxide salt.
  • a treatment is carried out in a next process by either using an acid or using an alkali (base), thereby removing away the silicon components (silicon oxides) such as the silicon dioxide, the silicon oxide and the silicon oxide salt.
  • silicon components silicon oxides
  • the porous carbon material in the embodiment of the present invention is a natural product-derived environment conciliatory material.
  • a fine structure of the porous carbon material is obtained by treating the silicon components (silicon oxides) previously contained in the raw material as the plant-derived material by either using the acid or using the alkali to remove away the silicon components. Therefore, an arrangement of the fine pores maintains the biological body regularity which the plant has.
  • the plant-derived material can be used as the raw material.
  • the present invention is by no means limited thereto.
  • a vascular plant for example, it is possible to give a vascular plant, a pteridophyte, or a bryophyte which is vegetated on the land, an alga or a sea alga.
  • these materials also may be used either in the form of singularity or in the form of multiple kinds of materials mixed with one another as the raw material.
  • a shape and a form of the plant-derived material are especially by no means limited.
  • the rice hull or straw itself may be used, or a product obtained by subjecting the plant-derived material to a drying treatment may also be used.
  • a state in which the functional material is adhered as the ions a state in which the functional material is adhered as the fine particle to the surface (including the inside of the fine pore) of the porous carbon material, a state in which the functional material is adhered as the fine particle to the surface (including the inside of the fine pore) of the porous carbon material, a state in which the functional material is adhered in the thin film form, a state in which the functional material is adhered in the sea/island form (when the surface of the porous carbon material is regarded as “the sea,” the functional material corresponds to “the island”) can be given as the form of the adhesion of the functional material to the porous carbon material.
  • the adhesion means the phenomenon of the adhesion between different kinds of materials.
  • a method in which the porous carbon material is dipped in the solution containing therein the functional material or a precursor thereof, thereby precipitating the functional material on the surface of the porous carbon material a method in which the functional material is precipitated on the surface of the porous carbon material by using a nonelectrolytic plating method (chemical plating method) or a chemical reduction reaction, or a method in which the porous carbon material is dipped in the solution containing therein the precursor of the functional material, and the heat treatment is carried out, thereby precipitating the functional material on the surface of the porous carbon material can be given as the general method of adhering the functional material to the porous carbon material.
  • a method in which the porous carbon material is dipped in the solution containing therein the precursor of the functional material, and an ultrasonic radiation treatment is carried out, thereby precipitating the functional material on the surface of the porous carbon material, or a method in which the porous carbon material is dipped in the solution containing therein the precursor of the functional material, and a sol/gel reaction is carried out, thereby precipitating the functional material on the surface of the porous carbon material can be given as the general method of adhering the functional material to the porous carbon material.
  • a nonmetal element such as magnesium (Mg), kalium (K), calcium (Ca), phosphorus (P) or sulfur (S), or a metal element such as a transition element may be contained in the porous carbon material in the embodiment of the present invention.
  • Mg magnesium
  • 0.01 wt % or more and 3 wt % or less can be given
  • 0.01 wt % or more and 3 wt % or less can be given as the content rate of kalium (K)
  • 0.05 wt % or more and 3 wt % or less can be given as the content rate of calcium (Ca)
  • 0.01 wt % or more and 3 wt % or less can be given as the content rate of phosphorus (P)
  • 0.01 wt % or more and 3 wt % or less can be given as the content rate of sulfur (S).
  • the content rates of these elements differ depending on the use application of the porous carbon material complex of the embodiment of the present invention, preferably, the content rates of these elements are each less from a viewpoint of an increase in value of the specific surface area.
  • the porous carbon material may contain any of elements other than the elements described above, and the ranges of the content rates of the various kinds of elements described above can change depending on the use application of the porous carbon material complex of the embodiment of the present invention.
  • the analyses about the various kinds of elements can be carried out in accordance with an energy dispersion method (EDS) by using an energy dispersive X-ray analyzer (such as JED-2200F made by JAPAN ELECTRON OPTICS LABORATORY CO., LTD.).
  • EDS energy dispersion method
  • JED-2200F made by JAPAN ELECTRON OPTICS LABORATORY CO., LTD.
  • a measurement condition for example, has to be set in such a way that a scanning voltage is 15 kV, and a radiation current is 10 ⁇ A.
  • the porous carbon material complex of the embodiment of the present invention has many fine pores.
  • “A meso fine pore” having a pore diameter of 2 to 50 nm, and “a micro fine pore” having a pore diameter smaller than 2 nm are contained as the fine pore in the porous carbon material complex.
  • the porous carbon material complex for example, contains therein many fine pores each having the pore diameter of 20 nm or less as the meso fine pores, especially, contains therein many fine pores each having the pore diameter of 10 nm or less.
  • the porous carbon material complex for example, contains therein many fine pores each having the pore diameter of about 1.9 nm, many fine pores each having the pore diameter of about 1.5 nm, and many fine pores each having the pore diameter of 0.8 to 1 nm as the micro fine pores.
  • a volume of the fine pore based on both the BJH method and the MP method is equal to or larger than 0.1 cm 3 /g, more preferably, equal to or larger than 0.3 cm 3 /g.
  • the volume of the fine pore based on the BJH method is preferably equal to or larger than 0.1 cm 3 /g, more preferably is equal to or larger than 0.3 cm 3 /g, and much more preferably is equal to or larger than 0.5 cm 3 /g.
  • the value of the specific surface area based on the nitrogen BET method is preferably equal to or larger than 50 m 2 /g, is more preferably equal to or larger than 100 m 2 /g, and is much more preferably equal to or larger than 400 m 2 /g.
  • the nitrogen BET method means a method in which an adsorption isotherm is measured by adsorbing and desorbing nitrogen molecules as adsorbed molecules to and from the adsorbent (the porous carbon material complex in this case), and data obtained through the measurement is analyzed based on a BET expression expressed by Expression (1).
  • the specific surface area, the fine pore volume and the like can be calculated based on the nitrogen BET method.
  • the adsorption isotherm is obtained by adsorbing and desorbing the nitrogen molecules as adsorbed molecules to and from the adsorbent (porous carbon material complex).
  • V m and C are calculated from the slope, s, and intercept, i, thus obtained based on Expression (2-1) and Expression (2-2).
  • a specific surface area, a sBET is calculated from V m based on Expression (3). This calculation, for example, is described in a manual of BELSORP-mini and BELSORP analysis software made by BEL JAPAN, INC., pp. 62 to 66. It should be noted that the nitrogen BET method is a measurement method conforming to JIS R 1626-1996 “A method of measuring a specific surface area based on a gas adsorption BET method for fine ceramics powder.”
  • V a ( V m ⁇ C ⁇ p )/[( p 0 ⁇ p ) ⁇ 1+( C ⁇ 1)( p/p 0 ) ⁇ ] (1)
  • V m 1/( s+i ) (2-1)
  • V a is an amount of adsorption
  • V m is an amount of adsorption of a single molecule layer
  • p is a pressure in a phase of equilibrium of nitrogen
  • p 0 is a saturated vapor pressure
  • L is an Avogadro's number
  • ⁇ is an adsorption cross section of nitrogen.
  • the fine pore volume, V p is calculated based on the nitrogen BET method, for example, the adsorption data on the adsorption isotherm thus obtained is linearly interpolated, thereby obtaining the amount, V, of adsorption at the relative pressure set in the fine pore volume calculation relative pressure.
  • the fine pore volume V p can be calculated from the amount, V, of adsorption based on Expression (4). This calculation, for example, is described in the manual of BELSORP-mini and BELSORP analysis software made by BEL JAPAN, INC., pp. 62 to 66. It is noted that the fine pore volume based on the nitrogen BET method will be referred hereinafter simply to as “a fine pore volume” in some cases.
  • V p ( V/ 22414) ⁇ ( M g / ⁇ g ) (4)
  • V is an amount of adsorption at the relative pressure
  • M g is molecular weight of nitrogen
  • ⁇ g is a density of nitrogen
  • the pore diameter of the meso fine pore for example, can be calculated in the form of a distribution of the fine pores from a change ratio of the fine pore volume to the pore diameter based on the BJH method.
  • the BJH method is a method which is widely used as a fine pore distribution analyzing method.
  • the fine pore distribution analysis is carried out based on the BJH method, firstly, the adsorption isotherm is obtained by adsorbing and desorbing the nitrogen molecules as adsorbed molecules to and from the adsorbent (porous carbon material complex).
  • a thickness of the adsorption layer when the adsorbed molecules are adsorbed and desorbed step by step from a state in which the fine pores are filled with the adsorbed molecules (for example, the nitrogen molecules), and an inner diameter of each of the pores (which is double the core radius) which are generated in this case are obtained based on the resulting adsorption isotherm, a fine pore radius, r p , is calculated based on Expression (5), and a fine pore volume is calculated based on Expression (6).
  • the change ratio (dV p /dr p ) of the fine pore volume to the fine pore diameter, 2r p is plotted from both the fine pore radius and the fine pore volume, thereby obtaining a fine pore distribution curve.
  • This calculation for example, is described in the manual of BELSORP-mini and BELSORP analysis software made by BEL JAPAN, INC., pp. 85 to 88.
  • V pn R n ⁇ dV ⁇ R n ⁇ dt ⁇ c ⁇ A pj (6)
  • r p is the fine pore radius
  • r k is the inner radius of the core (inner diameter/2) when the adsorption layer having a thickness, t, is adsorbed to an inner wall of the fine pore having the fine pore radius, r p , at the pressure set therein, V p , is the fine pore volume when the n-th round of adsorption and desorption of the nitrogen molecules are generated, and dV n is a change rate at this time.
  • dt n is a change rate of the thickness, t n , of the adsorption layer when the n-th round of adsorption and desorption of the nitrogen molecules are generated
  • r kn is a core radius at this time
  • c is a fixed value
  • r pn is the fine pore radius when the n-th round of adsorption and desorption of the nitrogen molecules is generated
  • the pore diameter of the micro fine pore for example, can be calculated in the form of a distribution of the fine pores from the change ratio of the fine pore volume to the pore diameter based on the MP method.
  • the fine pore distribution analysis is carried out based on the MP method, firstly, the adsorption isotherm is obtained by adsorbing the nitrogen molecules to the adsorbent (porous carbon material complex). Also, the adsorption isotherm is transformed into the fine pore volume relative to the thickness, t, of the adsorption layer (is t-plotted).
  • the fine pore distribution curve can be obtained based on a curvature (an amount of change in fine pore volume relative to an amount of change in thickness, t, of the adsorption layer). This calculation, for example, is described in the manual of BELSORP-mini and BELSORP analysis software made by BEL JAPAN, INC., pp. 72 and 73, and p. 82.
  • NLDFT method Non Localized Density Functional Theory method regulated in JIS Z8831-2: 2010 “A fine pore distribution and fine pore characteristics of powder (solid)—the second part: A method of measuring a meso fine pore and a macro fine pore based on gas adsorption,” and JIS Z8831-3: 2010 “A fine pore diameter distribution and fine pore characteristics of powder (solid)—the third part: A method of measuring a micro fine pore based on gas adsorption,” software that comes with an automatic specific surface area/fine pore distribution measuring apparatus “BELSORP-MAX” manufactured by BEL JAPAN, INC. is used as analysis software.
  • BELSORP-MAX automatic specific surface area/fine pore distribution measuring apparatus manufactured by BEL JAPAN, INC.
  • a model is formed so as to have a cylindrical shape and carbon black (CB) is assumed as the prerequisite, and a distribution function of a fine pore distribution parameter is set as “no-assumption.”
  • the smoothing is carried out ten times for the resulting distribution data.
  • the fungicide of the embodiment of the present invention when the fungicide of the embodiment of the present invention is regulated based on the non localized density functional theory method, the fungicide of the embodiment of the present invention for attaining the desire described above includes:
  • the photo catalytic composite material of the embodiment of the present invention when the photo catalytic composite material of the embodiment of the present invention is regulated based on the non localized density functional theory method, the photo catalytic composite material of the embodiment of the present invention for attaining the desire described above includes:
  • the photo catalytic material is composed of a titanium oxide doped either with a cation or with an anion.
  • the adsorbent or the depurative of the embodiment of the present invention for attaining the desire described above includes:
  • the organic material adsorbs a metal.
  • the value of the specific surface area based on the nitrogen BET method is equal to or larger than 10 m 2 /g, and the total of the volumes of the fine pores having the diameters in the range of 1 ⁇ 10 ⁇ 9 to 5 ⁇ 10 ⁇ 7 m obtained based on the non localized density functional theory method is equal to or larger than 0.1 cm 3 /g.
  • the value of the specific surface area based on the nitrogen BET method is equal to or larger than 10 m 2 /g, and a rate of the total of the volumes of the fine pores having at least one peak in the range of 3 to 20 nm, and having the fine pore diameters in the range of 3 to 20 nm in the fine pore diameter distribution obtained based on the non localized density functional theory method is equal to or larger than 0.2 of the total of the volumes of all the fine pores.
  • the porous carbon material precursor is treated by using either the acid or the alkali.
  • a method of dipping the porous carbon material precursor in an aqueous solution of either the acid or the alkali, or a method of causing the porous carbon material precursor and the acid or the alkali to react with each other in a gas phase, for example, can be given as the concrete treatment method.
  • a fluorine compound, showing an acidic property, such as hydrogen fluoride, a hydrofluoric acid, ammonium fluoride, calcium fluoride or sodium fluoride can be given as the acid.
  • the fluorine compound When the fluorine compound is used, fluorine elements have to be four times in its amount as large as the silicon elements in the silicon components contained in the porous carbon material precursor.
  • the concentration of the fluorine compound aqueous solution is equal to or larger than 10 wt %.
  • the silicon components such as the silicon dioxide
  • the silicon dioxide reacts with the hydrofluoric acid as shown either in Chemical Formula (A) or in Chemical Formula (B) to be removed away either as a hexafluorosilicic acid (H 2 SiF 6 ) or as silicon tetrafluoride (SiF 4 ), thereby making it possible to obtain the porous carbon material.
  • the rinsing and the drying have to be carried out.
  • sodium hydroxide for example, can be given as the alkali.
  • pH of the aqueous solution has to be equal to or larger than 11.
  • the silicon compounds for example, the silicon dioxide contained in the porous carbon material precursor are removed away by using the sodium hydroxide aqueous solution, the silicon dioxide reacts with the sodium hydroxide as shown in Chemical Formula (C) by heating sodium hydroxide aqueous solution to be removed away as sodium silicate (Na 2 SiO 3 ), thereby making it possible to obtain the porous carbon material.
  • the silicon dioxide reacts with the sodium hydroxide as shown in Chemical Formula (C) by heating a solid substance of sodium hydroxide to be removed away as sodium silicate (Na 2 SiO 3 ), thereby making it possible to obtain the porous carbon material. Also, after that, the rinsing and the drying have to be carried out.
  • the porous carbon material for example, disclosed in Japanese Patent Laid-Open No. 2010-106007 and including vacancies having three-dimensional regularity (the porous carbon material having a so-called inverted-opal structure) can also be used as the porous carbon material in the embodiment of the present invention.
  • the porous carbon material which includes the spherical vacancies having an average diameter of 1 ⁇ 10 ⁇ 9 to 1 ⁇ 10 ⁇ 5 m, and three-dimensionally disposed, and which has the specific surface area equal to or larger than 3 ⁇ 10 2 m 2 /g, preferably, the porous carbon material in which macroscopically, the vacancies are arranged in a disposition state corresponding to a crystal structure, or macroscopically, the vacancies are arranged on the surface of the porous carbon material in a disposition state corresponding to (111) surface orientation in a face-centered cubic structure can also be used as the porous carbon material in the embodiment of the present invention.
  • Example 1 relates to the fungicide of the embodiment of the present invention.
  • the fungicide of Example 1 includes:
  • a value of a specific surface area based on the nitrogen BET method is equal to or larger than 10 m 2 /g, and a volume of a fine pore based on both the BJH method and the MP method is equal to or larger than 0.1 cm 3 /g.
  • the fungicide of Example 1 includes:
  • the value of the specific surface area based on the nitrogen BET method is equal to or larger than 10 m 2 /g, and the total of the volumes of the fine pores having the diameters in the range of 1 ⁇ 10 ⁇ 9 to 5 ⁇ 10 ⁇ 7 m obtained based on the non localized density functional theory method is equal to or larger than 0.1 cm 3 /g.
  • the value of the specific surface area based on the nitrogen BET method is equal to or larger than 10 m 2 /g, and a rate of the total of the volumes of the fine pores having at least one peak in the range of 3 to 20 nm, and having the fine pore diameters in the range of 3 to 20 nm in the fine pore diameter distribution obtained based on the non localized density functional theory method is equal to or larger than 0.2 of the total of the volumes of all the fine pores.
  • Example 1 a rice hull of rice (rice plant) was used as the plant-derived material as the raw material of the porous carbon material. Also, the rice hull as the raw material is carbonized to be transformed into a carbonaceous material (the porous carbon material precursor), and the resulting carbonaceous material is then subjected to an acid treatment, thereby obtaining the porous carbon material in Example 1. Also, after the porous carbon material is obtained in the manner as described above, a functional material (silver member) is adhered (supported, adsorbed or bonded) to the porous carbon material, thereby making it possible to obtain a porous carbon material complex (fungicide).
  • a functional material silver member
  • the silver member is composed of silver (silver of a metal), and is adhered in the form of a form and a shape of a fine particle to a surface (including an inside of the fine pore) of the porous carbon material.
  • silver silver of a metal
  • the silver member is adhered in the form of a form and a shape of a fine particle to a surface (including an inside of the fine pore) of the porous carbon material.
  • the resulting material is treated by using either the acid or the alkali, thereby obtaining the porous carbon material. That is to say, firstly, the rice hull was subjected to the heating treatment (preliminary carbonizing treatment) in the inactive gas. Specifically, the rice hull was heated at 500° C. for 5 hours in the nitrogen gas-flow to be carbonized, thereby obtaining a carbide. It is noted that by carrying out such a treatment, the tar component which will be generated during the next carbonization can be either reduced or removed away.
  • the heating treatment preliminary carbonizing treatment
  • porous carbon material-A a porous carbon material for the sake of convenience.
  • porous carbon material-B a porous carbon material for the sake of convenience.
  • a silver material was adhered (supported, adsorbed or bonded) to the resulting porous carbon material-B.
  • the treatment for adhering the functional material to the porous carbon material will be hereinafter referred to as “a compound treatment” in some cases.
  • 0.43 g of the porous carbon material-B was added to 182 ml of distilled water, and the stirring was carried out for 30 minutes.
  • 10 ml of 40 mmol/l of sodium boron hydride was added thereto, and the stirring was carried out through the night.
  • the resulting powder was filtered by using a filter and was then rinsed by using distilled water, the drying was carried out at 120° C., thereby obtaining the fungicide of Example 1-A.
  • the silver member was adhered (supported, adsorbed or bonded) to the resulting porous carbon material-B by using a method different from that of the above case. Specifically, 0.215 g of porous carbon material-B was added to 1.33 mmol/l of 15 ml of a silver nitrate aqueous solution, and the stirring was carried out for 30 minutes. After that, after the heating was carried out at 100° C. and the boiling or the like was confirmed, 20 mmol/l of 5 ml of a trisodium acid citrate aqueous solution was dropped, and the reflux flow was carried out for 15 minutes. Also, after the resulting powder was filtered by using a filter and was then rinsed by using distilled water, the drying was carried out at 120° C., thereby obtaining the fungicide of Example 1-B.
  • porous carbon material-B was used as Comparative Example 1 for various kinds of tests.
  • Example 1-A The element analysis about Example 1-A, Example 1-B, and Comparative Example 1 was carried out based on an energy dispersion method by using an energy dispersive X-ray analyzer. The analysis results are shown in Table 1.
  • composition ratio of silver is increased in each of the fungicides of Example 1-A and Example 1-B, it is estimated that the silver member was adhered (supported, adsorbed or bonded) to the porous carbon material by carrying out the silver precipitating treatment either in [Process-110A] or in [Process-110B].
  • FIG. 1 shows electron microscope images of the fungicide of Example 1-A, Example 1-B, and the specimen of Comparative Example 1. A situation in which in each of the fungicides of Example 1-A and Example 1-B, the fine particles each having a particle size of about several tens of nanometer were precipitated was confirmed from these electron microscope images.
  • identification of the product, and an estimation of the particle size were carried out based on the X-ray diffraction analysis.
  • an X-ray diffraction system (RINT-TTRII) manufactured by RIGAKU CORPORATION was used, and a Cu—K ⁇ ray was used as an X-ray source. It is noted that a wavelength is 0.15405 nm.
  • an applied voltage was set as 50 kV, and a scanning step was set as 0.04°.
  • BELSORP-mini manufactured by BEL JAPAN INC.
  • BEL JAPAN INC. was used as a measurement instrument for obtaining the value of the specific surface area, and the fine pore volume, and a test for adsorbing and desorbing nitrogen was carried out.
  • a measurement equilibrium relative pressure (p/p 0 ) was set in the range of 0.01 to 0.99. Also, the value of the specific surface area, and the fine pore volume was calculated based on the BELSORP analysis software.
  • the test for adsorbing and desorbing nitrogen was carried out by using the measurement instrument described above, thereby calculating the fine pore diameter distribution of the meso fine pores and the micro fine pores based on both the BJH method and the MP method using the BELSORP analysis software.
  • Example and Comparative Example as well which will be described later, the value of the specific surface area and the fine pore volume, and the fine pore diameter distribution of the meso fine pores and the micro fine pores were measured by using the same method as that in the above case.
  • analysis software that comes with the automatic specific surface area/fine pore distribution measuring apparatus “BELSORP-MAX” manufactured by BEL JAPAN, INC. was used for the analysis based on the non localized density functional theory method. It is noted that for the measurement, drying was carried out at 200° C. for 3 hours as a pretreatment for a specimen.
  • Example 1-A and Example 1-B With regard to the fungicides of Example 1-A and Example 1-B, and the specimen of Comparative Example 1 (porous carbon material-B), the value of the specific surface area, and the fine pore volume were measured, and as a result, the results shown in Table 2 were obtained. In addition, the fine pore diameter distribution of the meso fine pores and the micro fine pores was measured, and as a result, the results shown in FIGS. 3A and 3B were obtained.
  • the rate of the total of the volumes of the fine pores having the fine pore diameters in the range of 3 to 20 nm in the total volume of all the fine pores was as follows. It is noted that since the porous carbon material-B is prepared for Comparative Example 1, a large difference in rate of the total of the volumes of the fine pores between Example 1-A and Example 1-B, and Comparative Example 1 is not recognized so much.
  • Example 1-A 0.435 (total of volumes of all fine pores: 1.381 cm 3 /g)
  • Example 1-B 0.538 (total of volumes of all fine pores: 1.293 cm 3 /g)
  • Example 1-A and Example 1-B the content rate of silicon (Si) was remarkably decreased.
  • the porous carbon material precursor is treated by using the acid to remove away the silicon components such as the silicon dioxide contained therein, which contributes to the increase in value of the specific surface area.
  • the number of meso fine pores and micro fine pores is increased by carrying out the treatment using the acid. This also applies to Example which will be described later.
  • the same results were obtained in the porous carbon material as well which was obtained by carrying out the treatment using the alkali (base) such as a sodium hydroxide aqueous solution instead of using a hydrofluoric acid aqueous solution.
  • the fungicide of Example 1 can also be utilized as a deodorant product, a deodorizer, an antimicrobial agent, or a preserving agent.
  • Example 2 relates to a photo catalytic composite material of the embodiment of the present invention.
  • the photo catalytic composite material of Example 2 (or, a depurative based on the photo catalytic composite material) includes:
  • a porous carbon material specifically, having a plant-derived material containing therein silicon as a raw material, more specifically, a porous carbon material having a plant-derived material containing therein silicon having a content rate of 5 wt % or more as a raw material, the content rate of silicon being equal to or smaller than 1 wt %;
  • a value of a specific surface area based on the nitrogen BET method is equal to or larger than 10 m 2 /g, and a volume of a fine pore based on both the BJH method and the MP method is equal to or larger than 1 cm 3 /g, also, the photo catalytic material is composed of a titanium oxide doped either with a cation or with an anion.
  • the photo catalytic composite material (or the depurative based on the photo catalytic composite material) of Example 2 includes:
  • the photo catalytic material is composed of a titanium oxide doped either with a cation or with an anion.
  • the value of the specific surface area based on the nitrogen BET method is equal to or larger than 10 m 2 /g, and the total of the volumes of the fine pores having the diameters in the range of 1 ⁇ 10 ⁇ 9 to 3 ⁇ 10 ⁇ 7 m obtained by utilizing the non localized density functional theory method is equal to or larger than 0.1 m 3 /g.
  • the value of the specific surface area based on the nitrogen BET method is equal to or larger than 10 m 2 /g, and the rate of the total of the volumes of the fine pores having at least one peak in the range of 3 to 20 nm, and having the fine pore diameters in the range of 3 to 20 nm in the fine pore diameter distribution obtained by utilizing the non localized density functional theory method is equal to or larger than 0.2 of the total of the volumes of all the fine pores.
  • the photo catalytic material (functional material) is composed of the titanium oxide (TiO 2 ) functioning as a photo catalyst.
  • the titanium oxide is adhered (supported, adsorbed or bonded) to the porous carbon material.
  • the porous carbon material complex is given a charge separation property, an ultraviolet ray absorption property, and a catalyst property.
  • the photo catalytic composite material can be used as a harmful material decomposition agent, and a harmful material remover which can be semi-permanently used due to the photo catalytic effect.
  • the titanium oxide is doped either with the cation or with the anion, for example, the titanium oxide can adsorb an energy of a light having a wavelength of 200 to 600 nm, or an energy of a visible light. It is noted that a conceptual view of the adsorption of the energy is shown in FIG. 5 . In addition, light absorption characteristics of the titanium oxide (TiO 2 ) are shown in FIG. 6 .
  • Example 2 the functional material composed of the titanium oxide doped either with the cation or with the anion was adhered (supported, adsorbed or bonded) to the porous carbon material-B descried above, concretely, the compounding treatment was carried out as follows.
  • Example 2 the specimen obtained in this stage was used as a specimen of “Comparative Example 2.”
  • crystal growth was carried out at 400° C. in an ammonia gas atmosphere to dope the titanium oxide with an anion composed of nitrogen, thereby making it possible to obtain the photo catalytic composite material (depurative) of Example 2-A.
  • an aqueous solution was prepared in which 0.24 g of FeCl 3 .6H 2 O was dissolved in 150 ml of pure water, and pH 2 was obtained by using a hydrochloric acid.
  • the photo catalytic composite material thus obtained of Example 2-A was dispersed in the aqueous solution, and the stirring was carried out for 1 hour, the photo catalytic composite material was filtered by using a filter, and was rinsed in a distilled water. After that, the photo catalytic composite material was dried at 150° C., thereby making it possible to obtain a photo catalytic composite material (depurative) of Example 2-B.
  • a treatment is a treatment which is carried out for the purpose of doping the titanium oxide with an iron ion as the cation.
  • TiO 2 titanium oxide
  • XRD X-ray diffraction analysis
  • the specific surface area and the entire fine pore volume were measured based on the nitrogen BET method, the BJH method, and the MP method, and the measurement results are shown in Table 3.
  • results of measurements of the fine porous (meso fine pores) are shown in FIG. 7 .
  • FIG. 8 shows the measurement results of the fine pore diameter distributions about Example 2-A and Example 2-B which are obtained by utilizing the non localized density functional theory method.
  • the rate of the total of the volumes of the fine pores having the fine pore diameters in the range of 3 to 20 nm in the total volume of all the fine pores was as follows.
  • Example 2-A 0.561
  • Example 2-A 13 mg of the photo catalytic composite material of Example 2-A, and 13 mg of the specimen of Comparative Example 2 were each added to 50 ml of 0.08 mmol/l of a tannic acid aqueous solution. After a lapse of 24 hours, the pseudo solar light was radiated thereto. The radiation results are shown in FIG. 9 . Thus, in the case of Example 2-A, it was possible to reliably decompose the tannic acid aqueous solution.
  • Example 2-B 15 mg of the photo catalytic composite material of Example 2-B, and 15 mg of the specimen of Comparative Example 2 were each added to 50 ml of 0.15 mml/l of a methyl orange aqueous solution, and the pseudo solar light was radiated thereto.
  • the radiation results are shown in FIG. 10 .
  • Example 2-B it was possible to confirm that after a lapse of 8 hours from start of the radiation of the pseudo solar light, almost methyl orange was decomposed.
  • Example 2B In addition, an experiment was carried out such that 1.5 mg of the specimen (optical catalytic composite material) of Example 2-B, and 1.5 mg of a porous carbon material-B (Comparative Example 2′) were each added to 5 ml of water, 100 ⁇ g of micro-cystine was charged thereto every 24 hours, and the radiation and blocking of the pseudo solar light were repetitively carried out every 12 hours.
  • the experimental results are shown in FIG. 11A .
  • the porous carbon material-B Comparative Example 2′
  • micro-cystine was not approximately absorbed at the third round of charging, whereas in the case of the specimen of Example 2-B, a sharp adsorption was observed many times.
  • the porous carbon material in Example 2 is more specifically, the natural product-derived environment conciliatory material, and the fine structure thereof is obtained by treating the silicon components (silicon oxides) previously contained in the raw material as the plant-derived material by using either the acid or alkali to remove away the silicon components. Therefore, the fine pore has the size and the meso region (in the range of 2 to 50 nm) which cannot be realized in the existing activated carbon. In addition, the arrangement of the fine pores maintains the biological body regularity which the plant has. In the optical catalytic composite material of Example 2, by such a fine pore size and arrangement, the photo catalytic material can be very effectively adhered to the porous carbon material, and thus the decomposition based on the photo catalytic action can be effectively caused.
  • Example 3 relates to an adsorbent and a depurative of the embodiment of the present invention.
  • the adsorbent and the depurative of Example 3 include:
  • a photo catalytic composite material specifically, a porous carbon material having a plant-derived material containing therein silicon as a raw material, more specifically, a porous carbon material having a plant-derived material containing therein silicon having a content rate of 5 wt % or more as a raw material, the content rate of silicon being equal to or smaller than 1 wt %;
  • a value of a specific surface area based on a nitrogen BET method is equal to or larger than 10 m 2 /g, and a volume of a fine pore based on both the BJH method and the MP method is equal to or larger than 0.1 cm 3 /g,
  • the organic material adsorbs a metal.
  • the adsorbent or the depurative of Example 3 includes:
  • the value of the specific surface area based on the nitrogen BET method is equal to or larger than 10 m 2 /g, and the total of the volumes of the fine pores having the diameters in the range of 1 ⁇ 10 ⁇ 9 to 3 ⁇ 10 ⁇ 7 m obtained by utilizing the non localized density functional theory method is equal to or larger than 0.1 cm 3 /g.
  • the value of the specific surface area based on the nitrogen BET method is equal to or larger than 10 m 2 /g, and the rate of the total of the volumes of the fine pores having at least one peak in the range of 3 to 20 nm, and having the fine pore diameters in the range of 3 to 20 nm in the fine pore diameter distribution obtained by utilizing the non localized density functional theory method is equal to or larger than 0.2 of the total of the volumes of all the fine pores.
  • Example 3 polyethylene imine was used as the organic material.
  • a chromium (Cr) ion was adsorbed as the metal.
  • 0.3 g of the porous carbon material-B described above, and 1.5 g of polyethylene imine were dispersed in 100 ml of pure water, and the stirring was carried out for 1 hour, thereby adhering (supporting, adsorbing or bonding) polyethylene imine to the fine pores in the meso region of the porous carbon material-B.
  • Example 3 After 10 mg of the specimen of Example 3, and 10 mg of commercially available activated carbon (Comparative Example 3) were dispersed in 5 ml of each of various concentrations of potassium chromate, and the stirring was carried out for 1 hour, the absorbance was measured. The measurement results are shown in FIG. 14 . It was possible to confirm that the adsorbent and the depurative of Example 3 (indicated by “A” in FIG. 14 ) have the adsorptive performance which is 20 times as large as that of the commercially available activated carbon (indicated by “B” in FIG. 14 ).
  • the adsorbent and the depurative of Example 3 can effectively adsorb the metal (such as the metal atom or the metal ion) because the organic material is adhered (supported, adsorbed or bonded) to the porous carbon material.
  • a state in which the adsorbent and the depurative of Example 3 adsorb a potassium chromate ion is schematically shown in FIG. 15 .
  • the specific surface area and the entire fine pore volume were measured based on the nitrogen BET method, the BJH method and the MP method, and the measurement results are shown in Table 4.
  • FIG. 15 the specific surface area and the entire fine pore volume were measured based on the nitrogen BET method, the BJH method and the MP method, and the measurement results are shown in Table 4.
  • FIG. 1 the specific surface area and the entire fine pore volume were measured based on the nitrogen BET method, the BJH method and the MP method, and the measurement results are shown in Table 4.
  • FIG. 1 the specific surface area and the entire fine pore
  • Example 16 shows the measurement results of the fine pore diameter distributions about Example 3 and Comparative Example 3 which are obtained by utilizing the non localized density functional theory method.
  • the rate of the total of the volumes of the fine pores having the fine pore diameters in the range of 3 to 20 nm in the total volume of all the fine pores was as follows.
  • a straw of a rice plant (for example, Isehikari from Kagoshima Prefecture) is used as the plant-derived material as the raw material of the porous carbon material.
  • the straw as the raw material is carbonized to be transformed into the carbonaceous material (porous carbon material precursor), and the resulting porous carbon material precursor is then subjected to the acid treatment, thereby making it possible to obtain the porous carbon material.
  • the graminaceous reed is used as the plant-derived material as the raw material of the porous carbon material, and graminaceous reed as the raw material is carbonized to be transformed into the carbonaceous material (porous carbon material precursor).
  • the resulting porous carbon material precursor is subjected to the acid treatment, thereby making it possible to obtain the porous carbon material.
  • the same results were obtained even in the porous carbon material which was obtained in the treatment using an alkali (base) such as a sodium hydrate liquid solution instead of using a hydrofluoric acid liquid solution.
  • base such as a sodium hydrate liquid solution
  • a method of manufacturing the porous carbon material complex can be made same to that in each of Example 1 to Example 3.
  • the stalk brown seaweed (kukiwakame) (from Sanriku in Iwate Prefecture) is used as the plant-derived material as the raw material of the porous carbon material, and the stalk brown seaweed (kukiwakame) as the raw material is carbonized to be transformed into the carbonaceous material (porous carbon material precursor).
  • the resulting porous carbon material precursor is subjected to the acid treatment, thereby making it possible to obtain the porous carbon material.
  • the stalk brown seaweed (kukiwakame) is heated at a temperature of about 500° C. to be carbonized. It is noted that before the heating, for example, the stalk brown seaweed (kukiwakame) as the raw material may be treated by using alcohol.
  • a method of dipping the stalk brown seaweed (kukiwakame) as the raw material in ethyl alcohol or the like is given as the concrete treatment method.
  • the stalk brown seaweed (kukiwakame) is dipped in ethyl alcohol for 48 hours. It is noted that an ultrasonic treatment is preferably carried out in ethyl alcohol.
  • the stalk brown seaweed (kukiwakame) is heated at 500° C.
  • the carbide is put in a crucible made of alumina, and a temperature of 10 g of the carbide is made to rise to 1,000° C. at a rate of temperature rise of 5° C./minute in the nitrogen gas-flow (10 l/minute). Also, after the carbide is carbonized at 1,000° C. for 5 hour to be transformed into the carbonaceous material (porous carbon material precursor), the resulting porous carbon material precursor is cooled to a room temperature.

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