JP2015030656A - Active oxygen species generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an active oxygen species generator without generating a large amount of iron sludge or the like.SOLUTION: There is provided an active oxygen species generator which contains a metal (M) and charcoal (C) and is constituted using a charcoal/metal composite (MC) obtained by contacting a metal (M) and charcoal (C), at least one selected from the group consisting of hydrogen peroxide, hypohalous acid and oxygen and water as essential components. The metal preferably is magnesium, aluminum, zinc, iron, nickel, tin, lead or copper. The metal preferably is a metal particle and the charcoal (C) preferably is a charcoal particle.

Description

  The present invention relates to a reactive oxygen species generator. More specifically, the present invention relates to an active oxygen species generator that is optimal for oxidizing and decomposing harmful substances contained in waste water.

The Fenton method is known as a simple method for generating reactive oxygen species. As a wastewater treatment device that utilizes the Fenton method, “treatment that oxidizes and decomposes organophosphorus pesticides contained in treated water based on the Fenton method. A device,
The organophosphorus pesticide comprises an organic compound containing nitrogen and phosphorus, and the treatment apparatus includes a treatment tank, a treated water supply means attached to the treatment tank, a hydrogen peroxide addition means, and an iron ion addition means. , PH adjusting means,
The treated water supply means supplies the treated water containing the organophosphorus pesticide to the treatment tank, and the hydrogen peroxide addition means adds hydrogen peroxide to the treated water in the treatment tank. The iron ion addition means adds divalent iron ions to the water to be treated in the treatment tank,
The pH adjusting means adds a pH adjusting agent to the treated water supplied to the treated tank from the treated water supply means and the treated water supplied to the treated tank, and the treated water An apparatus for treating water containing organophosphorus pesticides, characterized in that is maintained at a predetermined weak acidity. (Patent Document 1) is known.

JP 2009-255078 A

According to the Fenton method, except that the treated water is acidic (preferably pH 2-4), there is a problem that the iron hydroxide to be formed forms flocs and a large amount of iron sludge is generated.
An object of the present invention is to provide an active oxygen species generator that does not generate a large amount of iron sludge or the like.

The active oxygen species generator of the present invention is characterized by containing a metal (M) and charcoal (C), and a charcoal / metal composite (MC) formed by contacting the metal (M) and charcoal (C). When;
At least one selected from the group consisting of hydrogen peroxide, hypohalous acid and oxygen;
The gist is that water is an essential component.

  The feature of the method for producing reactive oxygen species of the present invention is that it contains a metal (M) and charcoal (C), and a charcoal / metal composite (MC) formed by contacting the metal (M) and charcoal (C). ) And at least one selected from the group consisting of hydrogen peroxide, hypohalous acid, and oxygen in the presence of water to generate active oxygen species.

  The feature of the method for producing an oxidized compound of the present invention is that it includes a step of obtaining an oxidized compound by bringing the active oxygen species generator and an organic substance into contact with each other.

  The feature of the wastewater treatment method of the present invention is that it includes a contact step of bringing the active oxygen species generator and wastewater into contact with each other.

  Since the active oxygen species generator of the present invention does not use the Fenton reaction using iron ions, there is no generation of iron sludge.

  Since the method for producing reactive oxygen species of the present invention does not use the Fenton reaction using iron ions, there is no generation of iron sludge. Moreover, since a charcoal / metal composite (MC) is used, active oxygen species can be produced efficiently.

  Since the method for producing an oxidized compound of the present invention uses the active oxygen species generator described above, an oxidized compound can be obtained by efficiently oxidizing an organic substance without generating iron sludge.

  The wastewater treatment method of the present invention uses the above-mentioned active oxygen species generator, so that wastewater can be efficiently purified by oxidation treatment without generating iron sludge.

It is a photograph which shows before and after processing the dilution water prepared from commercially available oolong tea using the active oxygen generator of this invention (Example 4).

In the present invention, the term "reactive oxygen species", hydroperoxy radicals (· OOH), hydroxy radical (· OH), superoxide anion _{(O 2} · ^{-) -} means ^(OOH) or the like, hydroperoxides anion.

  The metal (M) is not a metal that reacts violently with water, but is not limited as long as it is a metal that can be eluted as ions in water by contacting with charcoal (C) in water. Aluminum, zinc, iron, nickel, tin, lead or copper is preferable, magnesium, aluminum, zinc, nickel or tin is more preferable, and aluminum is particularly preferable.

  The charcoal (C) can be used without limitation as long as it is a charcoal obtained by steaming an organic substance {bamboo, wood, coconut shell, rattan, chicken dung, etc.}.

  The organic substance that is the raw material for the charcoal (C) is not limited as long as it can be carbonized, but bamboo and wood are preferable from the viewpoint of quality and the like. Of bamboo and wood, from the viewpoint of environmental protection, waste materials (construction waste materials, furniture waste materials, used crackers, waste pallets), planted pruning materials, and compression molded bodies obtained by compression molding these crushed materials can be used. .

  Charcoal (C) is preferably produced in a vertical carbonization furnace. As carbonization temperature (degreeC), about 500-1000 are preferable, More preferably, it is about 700-800.

  The charcoal (C) itself does not necessarily need to be porous. However, since the reaction site is increased by being porous, the charcoal (C) is preferably porous.

  The refining degree of the charcoal (C) is preferably about 0 to 6, more preferably 0 to 5, particularly preferably 0 to 4, and most preferably 0 to 3.

  The degree of refining is a number representing the degree of carbonization. The refining meter {for example, a charcoal refining meter manufactured by Sanyo Electric Co., Ltd.) is used to calculate the electrical resistance value (Ω / cm) between two points on the surface of the measurement sample. The number of exponents of this electrical resistance value was measured and used as the degree of refinement. It can be said that the smaller the value of the refining degree, the smaller the electric resistance and the more the graphite structure.

In the charcoal / metal composite (CM), the metal (M) and the charcoal (C) need to be in contact with each other. It is considered that the contact between the metal (M) and the charcoal (C) is sufficient as long as they are in contact with each other so that electrons can be exchanged. Increasing the contact area between the metal (M) and the charcoal (C) is considered to be able to efficiently transfer electrons.
Therefore, the shape of the metal (M) and the charcoal (C) is preferably a plate shape, a corrugated plate shape, a rod shape, or a particle shape rather than a large lump, and more preferably the metal (M) is a metal particle. (MP) and charcoal (C) is charcoal particles (CP).

  The weight average particle diameter (mm) of the metal particles (MP) is preferably about 0.1 to 20, more preferably about 0.2 to 10, and particularly preferably about 0.5 to 5.

  The weight average particle size is measured by measuring the particle size distribution of the measurement sample, and plotting the relationship between the cumulative content and the particle size on logarithmic probability paper {horizontal axis: particle size, vertical axis: cumulative content (wt%)}. The particle size corresponding to a cumulative content of 50% by weight is obtained. The particle size distribution is measured in accordance with JIS Z8815-1994, and the sieve is placed with the narrowest sieve on the bottom, the measurement sample is placed on the top sieve with the widest mesh, and the sieve vibrator And the weight of the measurement sample remaining on each sieve is measured, and the weight percentage of the measurement sample remaining on each sieve is determined based on the weight of the first measurement sample.

  In addition, regarding the magnitude | size of a metal particle (MP), it is preferable that both a big metal particle and a small metal particle are included, and it is preferable not to make the magnitude | size of a metal particle uniform.

  Although there is no restriction | limiting in particular in the shape of a metal particle (MP), It is preferable that an amorphous metal particle and / or a fibrous metal particle are included, More preferably, a fibrous metal particle is included. When the fibrous metal particles are contained, the contact between the fibrous metal particles and the contact between the fibrous metal particles and the carbon particles (CP) increase, and the fibrous metal particles and the carbon particles (CP) It is considered preferable because contact is ensured.

  When the fibrous metal particles are contained, the length (mm) of the fibrous metal particles is preferably about 0.1 to 20, more preferably about 0.2 to 10, particularly preferably 0.5 to 5. Degree. In this case, the thickness (diameter) of the fibrous metal particles is preferably about 1 μm to 5 mm, more preferably about 2 μm to 4 mm, and particularly preferably about 10 μm to 1 mm.

  The metal particles (MP) as described above can be obtained industrially, and can be prepared by mixing industrial products as necessary, but in order to obtain them at a lower cost, metal products and metal parts are manufactured. In this case, cutting powder generated at the time of recovery, recovered metal {recovered aluminum can, recovered steel can, other recovered metal scraps, etc .; When cutting powder or recovered metal is used, it is necessary to wash the water-insoluble cutting fluid or oil if it is attached. If water-soluble cutting fluid is attached, it may be used as it is. You may wash | clean and use.

  The size of the organic material used as the raw material for the carbon particles (CP) is carbonized as it is originally small, such as coconut shells, and the large one, such as bamboo or wood, is crushed to a size within 2 to 10 cm before carbonization. It is preferable to make it.

  The carbon particles (CP) may be reduced in size by crushing or the like, and further sieved by a screen (such as a wire mesh).

The contents of metal (M) and charcoal (C) are not particularly limited, but the following ranges are preferable from the viewpoint of the generation efficiency of active oxygen species.
The content (% by weight) of the metal (M) is preferably 10 to 90, more preferably 20 to 80, and particularly preferably 24 to 70, based on the weight of the metal (M) and the charcoal (C).
As for content (weight%) of charcoal (C), 10-90 are preferable based on the weight of a metal (M) and charcoal (C), More preferably, it is 20-80, Most preferably, it is 30-76.

  The charcoal / metal composite may be configured in any manner as long as the metal (M) and the charcoal (C) are not in contact with each other. For example, the following forms are included.

(1) Form (1) in which metal particles (MP) and carbon particles (CP) are integrally molded.
(2) A form (2) in which metal particles (MP) and carbon particles (CP) are held in a net container (including a container or bag having a large number of holes, and a cloth bag, the same applies hereinafter).
(3) A form in which metal particles (MP) and charcoal particles (CP) are held in a cartridge having a liquid inlet and outlet (3).
(4) A form (4) in which plate-like metal (M) and carbon particles (CP) are held in a container having a liquid inlet and outlet.
(5) Form (5) in which metal particles (MP) and charcoal particles (CP) are held in a container having a liquid inlet and outlet.
(6) A form (6) in which carbon particles (CP) are held in a metal (M) net container.
(7) A form (7) in which carbon particles (CP) and metal particles (MP) are held in a metal (M) net container.
(8) The form (8) which hold | maintained the metal particle (MP) in the net container made from charcoal (C).
(9) The form (9) which hold | maintained the carbon particle (CP) and the metal particle (MP) in the net container made from charcoal (C).

  The form (1) in which the metal particles (MP) and the carbon particles (CP) are integrally molded can be obtained, for example, by the method described in JP2011-25160A.

  In the form (2) in which the metal particles (MP) and the charcoal particles (CP) are held in the net container, the metal particles (MP) and the charcoal particles (CP) are mixed and put in the net container, MP) and carbon particles (CP) can be obtained by preventing them from coming out of the net container.

  As a net container, in addition to a net-like container (for example, a container or bag prepared with a stainless steel wire mesh), a container having a large number of holes (a container prepared with stainless steel punching metal) or a bag (for example, having a large number of holes opened) Polyethylene bags), and cloth bags (for example, bags made of nonwoven fabric, bags made of cotton).

  In the form (3) in which the metal particles (MP) and the charcoal particles (CP) are held in the cartridge having the liquid inlet and outlet, the metal particles (MP) and the charcoal particles (CP) are mixed to form a liquid. It can be obtained by sealing in a cartridge having an inlet and an outlet. Examples of the liquid include a mixture of a water-soluble organic solvent (such as methanol, ethanol, acetone, THF, and ether) and water, and water and wastewater (hereinafter the same).

  A known cartridge can be used as the cartridge having the liquid inlet and outlet. In addition, it is preferable to provide a filter or a net | network at the inflow port and discharge port of a liquid so that a metal particle (MP) and charcoal particle (CP) may not flow out.

  In the form (4) in which the plate-like metal (M) and the carbon particles (CP) are held in the container having the liquid inlet and outlet, the plate-like metal (M) and the charcoal particles (CP) It can be obtained by putting the metal (M) and the carbon particles (CP) in a mixed state.

  The container having the liquid inlet and outlet is not limited as long as it can hold plate-like metal (M) and carbon particles (CP). In addition, it is preferable to provide a filter or a net | network in the inflow port and discharge port of a liquid so that charcoal particle (CP) may not flow out.

In order to increase the surface area, the plate-like metal (M) is provided with a pattern on the surface, a hole is formed in the plate, the plate itself is made into a mesh shape, the plate itself is made into a corrugated plate, They may be rounded into a spiral shape or a combination thereof.
The size (including thickness) of the plate is not limited as long as it can be stored in the container.

  In the form (5) in which the metal particles (MP) and the carbon particles (CP) are held in a container having a liquid inlet and outlet, the metal particles (MP) and the carbon particles (CP) are mixed to form a liquid It can be obtained by placing it in a container having an inlet and an outlet.

  A container having a liquid inlet and outlet is not limited as long as it can hold metal particles (MP) and carbon particles (CP). In addition, it is preferable to provide a filter or a net | network at the inflow port and discharge port of a liquid so that a metal particle (MP) and charcoal particle (CP) may not flow out.

  The form (6) in which the carbon particles (CP) are held in the metal (M) net container can be obtained by putting the carbon particles (CP) in the metal (M) net container.

  The shape and size of the metal (M) net container are not limited as long as the carbon particles (CP) can be retained. However, as will be described later, as the active oxygen species are generated, the metal (M) gradually decreases, so it is preferable that the thickness (thickness) is sufficient so that the contents do not fall off from the net container.

  In the form (7) in which the carbon particles (CP) and the metal particles (MP) are held in the metal (M) net container, the carbon particles (CP) and the metal particles (MP) are stored in the metal (M) net container. ) Can be obtained.

  The type of metal (M) in the net container and the type of metal particles (MP) may be the same or different, but the ionization tendency of the metal (M) in the net container is more than the ionization tendency of the metal particles (MP). Is preferably smaller {the metal (M) in the mesh container is more difficult to elute into the liquid than the metal particles (MP). }.

  The form (8) which hold | maintained the metal particle (MP) in the net container made from charcoal (C) can be obtained by putting a metal particle (MP) in the net container made from charcoal (C).

  The shape and size of the net container made of charcoal (C) are not limited as long as the metal particles (MP) can be held. The net container made of charcoal (C) may draw up the charcoal in a mesh shape, or may carbonize after processing the organic material which is the raw material of charcoal into a net shape.

  In the form (9) in which the carbon particles (CP) and the metal particles (MP) are held in the net container made of carbon (C), the carbon particles (CP) and the metal particles (MP) are mixed, and the carbon (C) It can be obtained by placing it in a net container.

  The charcoal / metal composite is preferably provided with a gap through which liquid can freely enter and exit. That is, the charcoal / metal composite is preferably porous.

Depending on the form of the charcoal / metal composite, it can be immersed in the liquid or the liquid can be introduced into the charcoal / metal composite.
Form (1) in which metal particles (MP) and charcoal particles (CP) are integrally molded; Form (2) in which metal particles (MP) and charcoal particles (CP) are held in a net container; Net made of metal (M) Form (6) in which carbon particles (CP) are held in a container; Form (7) in which carbon particles (CP) and metal particles (MP) are held in a metal (M) net container; In the case of the form (8) in which the metal particles (MP) are held in the mesh container of the above; It is preferable to immerse in a liquid. In addition, these may be hold | maintained at a container and a liquid may be guide | induced to this container.

  Form (3) in which metal particles (MP) and charcoal particles (CP) are held in a cartridge having a liquid inlet and outlet; plate-like metal (M) and charcoal particles (CP) are supplied to a liquid inlet and In the case of a form (4) held in a container having a discharge port; and a form (5) in which metal particles (MP) and charcoal particles (CP) are held in a container having a liquid inlet and a discharge port, the inlet It is preferable to treat the liquid by allowing the liquid to flow in.

  At least one selected from the group consisting of hydrogen peroxide, hypohalous acid, and oxygen (oxygen molecules) is one that generates an active oxygen species by receiving electrons from the carbon / metal composite (MC). A supply source (oxygen atom supply source).

As hydrogen peroxide (H ₂ O ₂ ), hydrogen peroxide water may be used, or hydrogen peroxide water obtained by applying a high voltage to air or oxygen in the presence of an acidic aqueous solution may be used. . The latter is considered that hydrogen peroxide is generated by a chemical reaction represented by the following formula, and can also be generated by, for example, an apparatus described in Japanese Patent Application Laid-Open No. 2010-223569.

(Anode side) O ₂ + e ⁻ + H ⁺ → OOH
(Cathode side) • OOH + e ⁻ + H ⁺ → H ₂ O ₂

  Hypohalous acid includes hypochlorous acid (HOCl), hypobromous acid (HOBr), and hypoiodous acid (HOI). Hypohalous acid may be prepared by dissolving hypohalite (sodium hypochlorite, potassium hypobromite, etc.) in acidic aqueous solution, alkali metal halides (sodium chloride, potassium bromide, etc.) Strong acidic electrolyzed water obtained by electrolyzing an aqueous solution of) may be used. Regarding the latter strongly acidic electrolyzed water, when using an aqueous sodium chloride solution, it is considered that hypochlorous acid is generated by the chemical reaction formula represented by the following formula (the same applies to other alkali metal halides). For example, it can be generated by a strongly acidic hypochlorous acid water generator such as Hoshizaki Electric Co., Ltd. or Aqua System Co., Ltd.

(Anode side) 2Cl ⁻ + H ₂ O → HOCl + HCl + 2e ⁻
(Cathode side) 2Na ⁺ + 2H ₂ O + 2e ⁻ → 2NaOH + H ₂

As oxygen (O ₂ ), oxygen gas or air may be used.

If the carbon / metal composite (MC) and at least one selected from the group consisting of hydrogen peroxide, hypohalous acid and oxygen are close to each other so as to be able to perform an electron reaction and a chemical reaction, these May be configured in any manner. A preferred embodiment of the active oxygen species generator of the present invention is a form in which both are present in a liquid. For example, a charcoal / metal composite (MC), at least one selected from the group consisting of hydrogen peroxide, hypohalous acid, and oxygen, and a liquid, a container (a cartridge having a liquid inlet and outlet, etc.) Included)).
As described above, the liquid includes a mixture of a water-soluble organic solvent (such as methanol, ethanol, acetone, THF, and ether) and water, water and waste water, and water is an essential constituent.

  As will be described later, at least one selected from the group consisting of hydrogen peroxide, hypohalous acid and oxygen is consumed with the generation of active oxygen species, and therefore needs to be supplied as necessary. This supply may be continuous supply or intermittent supply, or may be supplied only at the beginning. When supplied only for the first time, hydrogen peroxide or the like is consumed, and the active oxygen species generator of the present invention is not configured. However, if the supply of hydrogen peroxide or the like is started again, the active oxygen species generator of the present invention is To be resurrected.

  It is not always clear what kind of chemical reaction the reactive oxygen species generator of the present invention generates to generate reactive oxygen species. However, the reactive oxygen species generator of the present invention has a reactive oxygen species as follows. It is thought that it has occurred.

  That is, when comprising at least one selected from the group consisting of hydrogen peroxide, hypohalous acid and oxygen, water, and metal (M) {when carbon (C) is not used}, peroxidation When composed of at least one selected from the group consisting of hydrogen, hypohalous acid and oxygen, water, and charcoal (C) {when no metal (M) is used}, or metal (M) When no contact is made with the charcoal (C), no active oxygen species are generated; the metal (M) is reduced with the generation of active oxygen species; Since the seeds are difficult to generate, the metal (M) and the charcoal (C) are in electrical contact with each other, so that the metal (M) is eluted into the water as ions, and the metal (M) and the charcoal (C). It is thought that a battery is formed between Then, this battery and at least one selected from the group consisting of hydrogen peroxide, hypohalous acid and oxygen act in water and undergo an oxidation-reduction reaction (electron transfer) as follows. It is thought that oxygen species are generated.

<When hydrogen peroxide is used (disproportionation reaction)>
(Reduction reaction) H ₂ O ₂ + e ⁻ → OH + OH ⁻
(Oxidation reaction) H ₂ O ₂ → .OOH + H ⁺ + e ⁻
“E ⁻ ” means electrons transferred to and from a battery formed of metal (M) and charcoal (C) (hereinafter the same).

<When using hypochlorous acid (disproportionation reaction; the same applies when other hypohalous acid is used)>
(Reduction reaction) HOCl + e ⁻ → OH + Cl ⁻
(Oxidation reaction) HOCl → OCl + H ⁺ + e ⁻

<When oxygen is used>
(Reduction reaction) O ₂ + e ⁻ → O _2. ⁻
In the case of using oxygen, it is considered that the corresponding oxidation reaction oxidizes a substrate (organic substance, pollutant in waste water, etc.) that is oxidized by active oxygen species and releases electrons. Even when hydrogen peroxide or hypohalous acid is used, instead of the oxidation reaction as described above, substrates oxidized by active oxygen species (organic substances, pollutants in waste water, etc.) are oxidized and electrons are released. It can be considered that this may occur in a competitive manner.

<Oxidation-reduction reaction that can be accompanied>
In addition to the chemical reaction as described above, the following chemical reaction is considered to occur competitively.
^{_{O 2 · - → O 2 +}} e -
O ₂ · ⁻ + H ₂ O ₂ → · OH + OH ⁻ + O ₂
・ OH + ・ OH → H ₂ O ₂
・ OH + ・ O ₂ ⁻ → OH ⁻ + O ₂
・ OH + H ₂ O ₂ → H ₂ O + • OOH

The Fenton reaction is an oxidation-reduction reaction of iron ions (Fe ²⁺ and Fe ³⁺ ) and copper ions (Cu ⁺ and Cu ²⁺ ) with hydrogen peroxide.
Therefore, in the present invention, when iron or copper is used as the metal (M), the metal ions generated by the battery reaction may cause the conventional Fenton reaction. On the other hand, when two or more stable ions such as magnesium, aluminum, and zinc are not present as the metal (M), the conventional Fenton reaction is considered not to proceed.
Fe ²⁺ + H ₂ O ₂ → Fe ³⁺ + .OH + OH ⁻
Fe ³⁺ + H ₂ O ₂ → Fe ²⁺ + · OOH + H ⁺

The method for producing reactive oxygen species of the present invention is a method using the active oxygen generator described above, that is, comprising metal (M) and charcoal (C), and the metal (M) and charcoal (C) are in contact with each other. And a carbon / metal composite (MC) formed in contact with at least one selected from the group consisting of hydrogen peroxide, hypohalous acid and oxygen in the presence of water to generate active oxygen species. If there is, there are no restrictions on the generation conditions.
As described above, water is contained in the liquid {a mixture of water-soluble organic solvent (methanol, ethanol, acetone, THF, ether, etc.) and water, water and waste water}.

  The method for producing an oxidized compound of the present invention is a reaction condition as long as it is a method using the above active oxygen generator, that is, a method including a step of obtaining an oxidized compound by contacting the above active oxygen species generator with an organic substance. There is no restriction on the etc. For example, when benzene is used as the organic substance, phenol is obtained as the oxidizing compound, and when barbituric acid (2,4,6-trioxypyrimidine) is used as the organic substance, alloxan (2,4,4) is used as the oxidizing compound. 5,6-tetraoxypyrimidine) is obtained.

  The wastewater treatment method of the present invention is not limited to the treatment conditions and the like as long as it is a method using the above-mentioned active oxygen generator, that is, a method including a contact step of bringing the above-mentioned active oxygen species generator and wastewater into contact with each other. . It is preferable that the waste water treated in this contact step is separated into solid and liquid (via a precipitation tank or the like) and then discharged or transferred to the next step.

  The pH of the liquid is considered to have an appropriate range depending on the type of metal (M). For example, when the metal (M) is aluminum, 6 to 8 is preferable, and 6.5 to 7.5 is more preferable. That is, the pH of water is preferably neutral. On the other hand, when a metal (M) is iron, 9-11 are preferable, More preferably, it is 9.5-10.5.

Hereinafter, unless otherwise specified, parts means parts by weight and% means% by weight.
<Example 1>
Chips (longest length: 2 to 10 cm) obtained by crushing wood waste pallets (southern wood) were carbonized in a vertical carbonization furnace (grass / wood chip continuous charcoal machine, TYPE 180 kg / Hr, Murai Iron Works). Later (700 to 800 ° C., 30 to 40 minutes), a wire mesh having a mesh opening of 2.8 mm was passed through to obtain carbon particles (CP1) having a maximum length of 0.1 to 2.8 cm. The scouring degree of the carbon particles (CP1) was 3.
The aluminum cutting waste (which contains a lot of fibrous cutting waste) discharged from the aluminum processing factory was passed through a metal mesh having an opening of 2.8 mm to obtain metal particles (MP1). The weight average particle diameter of the metal particles (MP1) was 100 μm.
Water-soluble coating agent (AC1) {Corn Starch, Fuchi Glue, Non-Gai Kogyo Co., Ltd., "Fueki" is a registered trademark of the company}} Uniformly distribute 150 parts of metal particles (MP1) in an aqueous solution consisting of 300 parts and 1000 parts of water. After mixing, the mixture was filtered through a wire mesh having an opening of 63 μm to obtain coated metal particles. Subsequently, the coated metal particles and 400 parts of carbon particles (CP1) were uniformly mixed and then air-dried at about 25 ° C. for about 12 hours to obtain granular coating mixed particles (CM1).

Coated mixed particles (CM1) 2200 parts, charcoal particles (CP1) 300 parts, ordinary Portland cement 1500 parts, inorganic compound aqueous solution {calcium chloride 2 parts, potassium chloride 2 parts, ferric chloride 2 parts, magnesium oxide 2 parts, chloride A mixed particle slurry (MPS1) was obtained by uniformly mixing 20 parts of an aqueous solution (2 parts of magnesium, 2 parts of ammonium chloride, and 2500 parts of water) and 700 parts of water. The mixed particle slurry (MPS1) is poured into a mold having an inner diameter of 50 mm and a depth of 30 mm, and after applying a pressure of about 1 kg / cm ² , the mixture is allowed to stand for 24 hours to form a charcoal / metal composite molded body (1). The obtained {molded body for charcoal-metal composite is eluted with water-soluble coating agent in water to form a charcoal / metal composite. The same applies hereinafter. }.

  It is known that 1,4-dioxane is not oxidatively decomposed by hydrogen peroxide or peroxide, but is oxidized by hydroxy radical (.OH) ("A study on the relationship between biodegradability enhancement and oxidation" of 1,4-dioxane using ozone and hydrogen peroxide ", WATER RESEARCH, 38, 2004, p2596-2604;" Enhanced sonochemical decomposition of 1,4-dioxane by ferrous iron ", WATER RESEARCH, 37,2003, p2372-2376; "Ozonation combined with electrolysis of 1,4-dioxane using a two-compartment electrolytic flow cell with solid electrolyte", WATER RESEARCH, 42,2008, p379-385), the reactive oxygen species generator of the present invention is The composition was subjected to a 1,4-dioxane decomposition test.

  0.14 g of 1,4-dioxane (Wako Pure Chemical Industries, Ltd.) was dissolved in 1000 ml of distilled water, and this was further diluted 2 times to prepare a 50 ppm 1,4-dioxane aqueous solution.

  500 ml of 1,4-dioxane aqueous solution, four molded bodies for charcoal / metal composite (1), and 100 ml of hydrogen peroxide (35% by weight, ADEKA Corporation) were placed in a glass beaker. While constituting the active oxygen species generator (1) and keeping the water temperature at 20 ° C., it was allowed to stand for 15 hours to obtain 1,4-dioxane oxidative decomposition treated water.

  Regarding 1,4-dioxane aqueous solution and 1,4-dioxane oxidative decomposition treated water, 1 based on Circular No. 59 Appendix 7 (activated carbon extraction-gas chromatograph mass spectrometry; GC conditions are as follows). When the concentration of 1,4-dioxane was measured, the aqueous 1,4-dioxane solution was 45 ppm (theoretical value was 50 ppm), and the 1,4-dioxane oxidative decomposition treated water was 24 ppm.

Model: Agilent7890A (Agilent Technology Co., Ltd.)
Detector: JEOL jms-Q1000GC K9
Column: CP-WAX52CB (0.32mm × 25m, 1.2μm)
Chamber temperature: 40 ℃ (3min) -20 ℃ / min-230 ℃ (5min)
Flow rate: 1.5ml / min
Injection temperature: 220 ° C
GCITF temperature: 250 ℃

  The 1,4-dioxane oxidative decomposition treated water was subjected to qualitative analysis by gas chromatography (retention time due to a standard substance), and oxidative decomposition products (ethanol, acetic acid, formic acid, Ethylene glycol monoformate, 1,4-dioxane-2-ol, sorbic acid, formaldehyde and the like) were detected.

  On the other hand, when 500 ml of 1,4-dioxane aqueous solution and four molded bodies for charcoal / metal composite (1) are placed in a glass beaker and left for 15 hours while maintaining the water temperature at 20 ° C., 1,4 When 500 ml of dioxane aqueous solution and 100 ml of hydrogen peroxide solution were placed in a glass beaker and left for 15 hours while maintaining the water temperature at 20 ° C., the concentration of 1,4-dioxane was 45 ppm (ie, 1, The oxidative degradation of 4-dioxane did not proceed.)

  From the above results, it is considered that a hydroxy radical (.OH) is generated from the active oxygen species generator of the present invention, and this hydroxy radical oxidatively decomposes 1,4-dioxane.

<Example 2>
Water-soluble coating agent (AC1) {Corn Starch, Fuchi Glue, Non-Gai Gin Kogyo Co., Ltd., "Fueki" is a registered trademark of the same company} 1540 parts of metal particles (MP1) uniformly in an aqueous solution consisting of 300 parts and 1000 parts of water After mixing, the mixture was filtered through a wire mesh having an opening of 63 μm to obtain coated metal particles. Subsequently, the coated metal particles and 660 parts of carbon particles (CP1) were uniformly mixed, and then air-dried at about 25 ° C. for about 12 hours to obtain granular coating mixed particles (CM2).

Coated mixed particles (CM2) 2200 parts, ordinary Portland cement 1100 parts, inorganic compound aqueous solution {calcium chloride 2 parts, potassium chloride 2 parts, ferric chloride 2 parts, magnesium oxide 2 parts, magnesium chloride 2 parts, ammonium chloride 2 parts 20 parts of water and an aqueous solution in which 2500 parts of water were uniformly mixed) and 700 parts of water were uniformly mixed to obtain a mixed particle slurry (MPS2). The mixed particle slurry (MPS2) is poured into a mold having an inner diameter of 50 mm and a depth of 30 mm, and after applying a pressure of about 1 kg / cm ² , the mixture is allowed to stand for 24 hours to form a charcoal / metal composite molded body (2). Obtained.

  The reactive oxygen species of the present invention was placed in a glass beaker with 1000 ml of dyeing factory waste water, two molded bodies for charcoal / metal composite (2), and 200 ml of hydrogen peroxide (35% by weight, ADEKA Corporation). While constituting the generator (2), the mixture was stirred (10 to 20 ml / min) while blowing air for 13 hours while maintaining the water temperature at 20 ° C. to obtain treated water.

Regarding dyeing factory wastewater and treated water, COD was measured in accordance with “20. Oxygen consumption by potassium dichromate (COD _Cr )” of JIS K0102: 2008. Met.

  On the other hand, 1000 ml of dyeing factory waste water and two molded bodies for charcoal / metal composite (2) were put into a glass beaker and stirred for 13 hours while blowing water (10-20 ml while keeping the water temperature at 20 ° C). In the case of 1000 ml of dyeing factory waste water and 200 ml of hydrogen peroxide water in a glass beaker, the water temperature is kept at 20 ° C. and stirred for 13 hours while blowing air (10 to 20 ml / min) There was no change in the COD of the treated water (ie, it remained at 3300 ppm).

  From the above results, it is considered that the active oxygen species {hydroxy radical (.OH)} is generated from the active oxygen species generator of the present invention, and this hydroxy radical oxidatively decomposes the waste water from the dyeing factory.

<Example 3>
Bincho charcoal (refining degree 2) was crushed and then passed through a wire mesh having an opening of 2.8 mm to obtain charcoal particles (CP2) having a maximum length of 0.1 to 2.8 cm.
Aluminum foil (foil) was cut to prepare metal particles (MP2) {1 cm × 1 cm × 0.4 mm thickness}.
30 g of charcoal particles (CP2) and 70 g of metal particles were uniformly mixed and filled into a 300 ml glass bottle to obtain a charcoal / metal composite (3).

  1 g of phenol (Wako Pure Chemical Industries, Ltd.) was dissolved in 1000 ml of distilled water to prepare a 1000 ppm phenol aqueous solution.

  1000 ml of an aqueous phenol solution, 5 molded bodies for charcoal / metal composite (3), and 100 ml of hydrogen peroxide (35% by weight, ADEKA Corporation) are placed in a glass beaker to generate reactive oxygen species according to the present invention. After the component (3) was constructed and the water temperature was kept at 20 ° C., the mixture was stirred for 6 hours while blowing air (10 to 20 ml / min), and then an additional 100 ml of hydrogen peroxide solution was added, Similarly, it was stirred for 18 hours to obtain treated water.

  About phenol aqueous solution and treated water, when phenol was quantified according to "28.1.2 4-aminoantipyrine spectrophotometry" of "28. Phenols" of JIS K0102: 2008, phenol aqueous solution was 1000 ppm, treated Water was 340 ppm.

  On the other hand, when 1000 ml of phenol aqueous solution and five molded bodies for charcoal / metal composites (3) were put in a glass beaker and treated in the same manner as above, 1000 ml of phenol aqueous solution and 100 ml of hydrogen peroxide solution (6 When 100 ml was added in a glass beaker after the treatment in the same manner as described above, the phenol in the treated water was not changed (that is, remained at 1000 ppm).

  From the above results, it is considered that the active oxygen species {hydroxy radical (.OH)} is generated from the active oxygen species generator of the present invention, and the hydroxy radical oxidizes and decomposes phenol.

<Example 4>
After the lid and bottom of the recovered aluminum can were cut off, the side surfaces were cut and stretched to a flat surface, and cut with a shredder to obtain 2.5 mm × 30 mm metal particles (MP3).
Water-soluble coating agent (AC1) {Corn Starch, Fue Glue, Non-Gai Gin Kogyo Co., Ltd., "Fueki" is a registered trademark of the same company} 1540 parts of metal particles (MP3) uniformly in an aqueous solution consisting of 300 parts and 1000 parts of water After mixing, the mixture was filtered through a wire mesh having an opening of 63 μm to obtain coated metal particles. Subsequently, the coating metal particles and 660 parts of carbon particles (CP2) were uniformly mixed, and then air-dried at about 25 ° C. for about 12 hours to obtain granular coating mixed particles (CM3).

Coated mixed particles (CM3) 2200 parts, ordinary Portland cement 1100 parts, inorganic compound aqueous solution {calcium chloride 2 parts, potassium chloride 2 parts, ferric chloride 2 parts, magnesium oxide 2 parts, magnesium chloride 2 parts, ammonium chloride 2 parts 20 parts of an aqueous solution in which 2500 parts of water were uniformly mixed) and 700 parts of water were uniformly mixed to obtain a mixed particle slurry (MPS3). The mixed particle slurry (MPS3) is poured into a mold having an inner diameter of 50 mm and a depth of 30 mm, and after applying a pressure of about 1 kg / cm ² , the mixture is allowed to stand for 24 hours to form a charcoal / metal composite molded body (4). Obtained.

  Commercial oolong tea 85 ml and distilled water 250 ml were mixed to prepare oolong tea dilution water.

  335 ml of oolong tea diluted water, two molded bodies for charcoal / metal composite (4), and 85 ml of hydrogen peroxide (35% by weight, ADEKA Corporation) are placed in a glass beaker, and the reactive oxygen species of the present invention While constituting the generator (4) and maintaining the water temperature at 20 ° C., it was stirred (5 to 10 ml / min) while blowing air for 4 hours to obtain treated water.

Although the oolong tea dilution water had a dark brown color (Fig. 1; left photo), the treated water became colorless and transparent (Fig. 1; right photo).
On the other hand, when 335 ml of oolong tea diluted water and two molded bodies for charcoal / metal composite (4) were put in a glass beaker and treated in the same manner as above, 335 ml of oolong tea diluted water, 85 ml of hydrogen peroxide water, Was put in a glass beaker and treated in the same manner as above, the hue of the treated water was not changed.

  From the above results, it is considered that the active oxygen species {hydroxy radical (.OH)} was generated from the active oxygen species generator of the present invention, and this hydroxy radical was oxidatively decomposed coloring components such as polyphenol contained in oolong tea. .

Claims (8)

A charcoal / metal composite (MC) comprising metal (M) and charcoal (C), wherein metal (M) and charcoal (C) are in contact;
At least one selected from the group consisting of hydrogen peroxide, hypohalous acid and oxygen;
A reactive oxygen species generator comprising water as an essential component. The active oxygen species generator according to claim 1, wherein the metal (M) is magnesium, aluminum, zinc, iron, nickel, tin, lead or copper. The active oxygen species generator according to claim 1 or 2, wherein the metal (M) is metal particles (MP) and the charcoal (C) is charcoal particles (CP). The active oxygen species generator according to claim 3, wherein the metal particles (MP) contain fibrous metal particles. The active oxygen species generator according to claim 3 or 4, wherein the carbon particles (CP) are carbon particles produced in a vertical carbonization furnace. Charcoal / metal composite (MC) containing metal (M) and charcoal (C), and in contact with metal (M) and charcoal (C), hydrogen peroxide, hypohalous acid and oxygen A method for producing an active oxygen species, wherein at least one selected from the group consisting of:   A method for producing an oxidized compound, comprising the step of obtaining an oxidized compound by contacting the active oxygen species generator according to any one of claims 1 to 5 with an organic substance.   A wastewater treatment method comprising a contact step of bringing the active oxygen species generator according to any one of claims 1 to 5 into contact with wastewater.