WO2012063305A1 - 水銀イオン含有液の処理方法及び水銀イオン吸着材 - Google Patents
水銀イオン含有液の処理方法及び水銀イオン吸着材 Download PDFInfo
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- WO2012063305A1 WO2012063305A1 PCT/JP2010/069831 JP2010069831W WO2012063305A1 WO 2012063305 A1 WO2012063305 A1 WO 2012063305A1 JP 2010069831 W JP2010069831 W JP 2010069831W WO 2012063305 A1 WO2012063305 A1 WO 2012063305A1
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- mercury ion
- mercury
- meth
- adsorbent
- acrylate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
Definitions
- the present invention relates to a method for treating a mercury ion-containing liquid and a mercury ion adsorbent, and in particular, a method for treating a mercury ion-containing liquid capable of selectively adsorbing mercury at a low cost and mercury ion adsorption.
- a mercury ion-containing liquid capable of selectively adsorbing mercury at a low cost and mercury ion adsorption.
- Metallic mercury tends to accumulate in the living body after being converted to organic mercury. Inorganic mercury before being converted to organic mercury also causes hand tremors and kidney damage. In this way, mercury is extremely harmful to the human body and ecosystem, so the concentration standards are strictly regulated by law. For example, the environmental standard for mercury in Japan is 0.0005 mg / L.
- Patent Document 1 discloses a method of adsorbing gaseous mercury by passing a special mercury adsorbent impregnated with a solution containing potassium permanganate.
- Patent Document 2 describes that mercury is adsorbed and removed using a mercury adsorbent in which potassium iodide is supported on an activated carbon carrier.
- Non-Patent Document 1 describes adsorption of mercury ions in water using activated carbon impregnated with sulfur.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a method for treating a mercury ion-containing liquid and a mercury ion adsorbent that can adsorb mercury ions cheaply and selectively.
- a graft chain polymerized using a monomer containing a dialkylaminoalkyl (meth) acrylate is introduced into a particulate base material. And a step of bringing the particulate adsorbent into contact with a mercury ion-containing liquid.
- the dialkylaminoalkyl (meth) acrylate includes 2- (dimethylamino) ethyl (meth) acrylate, 2- (diethylamino) ethyl (meth) acrylate, and It is preferably at least one monomer selected from the group consisting of 2- (dibutylamino) ethyl (meth) acrylate.
- the particulate base material is preferably silanized inorganic fine particles.
- the inorganic fine particles can be suitably used even under severe conditions such as high temperature and strong acid.
- silanization treatment by performing silanization treatment on the inorganic fine particles, it is possible to suitably generate radical active sites on the surface of the silanized inorganic fine particles.
- the silanization treatment preferably forms an organic group on the surface of the inorganic fine particles.
- the inorganic fine particles are preferably silica fine particles.
- the inorganic fine particles are silica fine particles, there is an additional effect that they can be suitably used even under severe conditions such as high temperature and strong acid.
- the method for treating a mercury ion-containing liquid according to the present invention preferably includes a pH adjusting step of adjusting the pH of the mercury ion-containing liquid to acid before bringing the particulate adsorbent into contact with the mercury ion-containing liquid.
- the mercury ion adsorption rate can be further improved.
- the mercury ion adsorbent according to the present invention is obtained by introducing a graft chain polymerized using a monomer containing a dialkylaminoalkyl (meth) acrylate into a particulate base material. It is a feature.
- the dialkylaminoalkyl (meth) acrylate is 2- (dimethylamino) ethyl (meth) acrylate, 2- (diethylamino) ethyl (meth) acrylate, and (meth) acrylic.
- the acid is at least one monomer selected from the group consisting of 2- (dibutylamino) ethyl.
- the particulate base material is silanized inorganic fine particles.
- the inorganic fine particles can be suitably used even under severe conditions such as high temperature and strong acid.
- silanization treatment by performing silanization treatment on the inorganic fine particles, it is possible to suitably generate radical active sites on the surface of the silanized inorganic fine particles.
- the inorganic fine particles are preferably silica fine particles.
- the inorganic fine particles are silica fine particles, there is an additional effect that they can be suitably used even under severe conditions such as high temperature and strong acid.
- the method of treating a mercury ion-containing liquid according to the present invention is a particulate material in which a graft chain polymerized using a monomer containing a dialkylaminoalkyl (meth) acrylate is introduced into a particulate substrate. Since the adsorbent is brought into contact with the mercury ion-containing liquid and has a structure including a step of adsorbing the mercury ions to the particulate adsorbent, the effect of being able to adsorb mercury ions cheaply and selectively. Play.
- the mercury ion adsorbent according to the present invention has a configuration in which a graft chain polymerized using a monomer containing a dialkylaminoalkyl (meth) acrylate is introduced into a particulate base material. Therefore, the effect that mercury ions can be adsorbed cheaply and selectively is exhibited.
- the present inventor has reported an anion exchange resin in which a graft chain obtained by polymerizing 2- (dimethyl) aminoethyl methacrylate is introduced into silanized silica (see Non-Patent Document 2).
- Such an anion exchange resin exhibits a high ion exchange capacity and adsorbs HCrO 4 ⁇ ions.
- the present inventors have found that the anion exchange resin unexpectedly adsorbs mercury ions, which are cations, while conducting studies to solve the above-described problems. Furthermore, surprisingly, the anion exchange resin was found to selectively adsorb mercury ions in the presence of other divalent metal ions, and the present invention was completed.
- the anion exchange resin can selectively adsorb mercury ions.
- the graft chains introduced into the substrate interact with the mercury ions to adsorb the mercury ions. . Therefore, regardless of the base material, mercury ions can be selectively adsorbed in the same manner as long as the base material is a graft chain polymerized with a monomer containing dialkylaminoalkyl methacrylate. I think it can be done.
- a particulate adsorbent obtained by introducing a graft chain polymerized using a monomer containing a dialkylaminoalkyl (meth) acrylate into a particulate substrate is used.
- the process of making it contact with a mercury ion containing liquid should just be included.
- the mercury ion adsorbent according to the present invention is one in which a graft chain polymerized using a monomer containing a dialkylaminoalkyl (meth) acrylate is introduced into a particulate base material.
- the mercury ion adsorbent according to the present invention is a particulate adsorption in which a graft chain polymerized using a monomer containing a dialkylaminoalkyl (meth) acrylate is introduced into a particulate substrate. Any material can be used.
- the particulate base material used in the present invention is not particularly limited, and may be an organic substance or an inorganic substance.
- the organic substance is not particularly limited, and for example, organic fine particles containing an organic polymer compound such as polyethylene, polypropylene, ethylene-vinyl alcohol copolymer (EVOH) can be suitably used.
- organic polymer compound such as polyethylene, polypropylene, ethylene-vinyl alcohol copolymer (EVOH)
- EVOH ethylene-vinyl alcohol copolymer
- the inorganic substance fine particles such as silica and carbon can be suitably used.
- the fine particles mean particles having an average particle diameter of 30 ⁇ m or more and 800 ⁇ m or less in a dry state.
- the base material is more preferably inorganic fine particles from the viewpoint of chemical stability and usability under harsh conditions.
- the substrate is preferably silanized inorganic fine particles from the viewpoint that a radical active site for introducing a graft chain can be suitably generated. More preferred.
- the inorganic fine particles are more preferably silica fine particles from the viewpoint of chemical stability and usability under severe conditions.
- the silica fine particles used in the present invention are not particularly limited, and may be dry silica or wet silica.
- specific examples of the silica fine particles include silica fine particles commercially available for ion chromatography fillers and various resin fillers.
- inorganic fine particles when used as the substrate, it is more preferable to use silanized inorganic fine particles as the substrate.
- silanized inorganic fine particles it is more preferable to use as the substrate.
- it is difficult to generate radical active sites for introducing graft chains in inorganic substances it is preferable to generate radical active sites on the surface of silanized inorganic fine particles by silanization treatment. Is possible. Therefore, the graft chain can be efficiently introduced into the substrate.
- the silanization treatment is particularly limited as long as it is a treatment for forming an organic group on the surface of the inorganic fine particles by modifying the inorganic fine particles with a silane compound having a hydrolyzable substituent.
- a conventionally known method can be used as appropriate.
- silanization treatment for example, inorganic particles such as silica particles are reacted with a silane compound having a hydrolyzable substituent to replace the hydroxyl groups present on the surface of the inorganic particles with organic siloxyl groups.
- the method of doing can be mentioned.
- the silane compound that can be used for the silanization treatment is not particularly limited, and examples thereof include trimethylchlorosilane and dimethyldichlorosilane.
- the silanization treatment method is not particularly limited, and a conventionally known method may be appropriately selected and used.
- a method in which inorganic fine particles are dispersed in a solvent and reacted with a silane compound can be suitably used.
- silanized inorganic fine particles commercially available silanized silica may be used.
- silanized silica examples include silica gel 60 silanized (manufactured by Merck).
- the shape of the substrate is not particularly limited as long as it is particulate, and may be a sphere, an ellipse, an irregular crush shape, or the like.
- a particulate adsorbent can be obtained. Therefore, conventional adsorption towers for ion exchange / chelate resin spheres, regeneration facilities, etc. can be used as they are.
- the shape of the substrate is more preferably spherical from the viewpoint of mechanical strength.
- the average particle size of the substrate is preferably 30 ⁇ m or more and 800 ⁇ m or less in a dry state, more preferably 50 ⁇ m or more and 500 ⁇ m or less, and further preferably 100 ⁇ m or more and 300 ⁇ m or less.
- the average particle diameter is a value determined by the following method. First, samples are collected from several locations of a set of particles serving as samples. Each sample is observed with a microscope, and the entire sample taken from several locations is the longest diameter of one target particle, that is, the largest dimension of the shape of the particle, for a total of 100 or more particles. Measure the dimension in the larger direction. Among the 100 or more measured values, an average of 60% of measured values excluding 20% in the upper and lower directions is defined as an average particle diameter in the present invention.
- a graft chain polymerized using a monomer containing dialkylaminoalkyl (meth) acrylate is introduced into a particulate base material.
- the graft chain means a polymer of the monomer that is fixed to a particulate base material.
- (meth) acryl is used to mean “acryl” or “methacryl”.
- These (meth) acrylic acid dialkylaminoalkyls may be used alone or in combination of two or more.
- the monomer used in the present invention may be a monomer containing dialkylaminoalkyl (meth) acrylate, and may contain other monomers other than dialkylaminoalkyl (meth) acrylate.
- the graft chain introduced into the base material may be obtained by homopolymerizing one kind of dialkylaminoalkyl (meth) acrylate, or the dialkylamino (meth) acrylate.
- Two or more kinds of alkyl may be copolymerized, or one or more of the above-mentioned dialkylaminoalkyl (meth) acrylates and one or more of the other monomers may be copolymerized. May be.
- the other monomer may be, for example, a polyfunctional monomer having two or more ethylenically unsaturated groups.
- a structure in which graft chains are crosslinked can be obtained. Thereby, the swelling degree of the surface of the particulate adsorbent used in the present invention can be adjusted.
- the graft chain is introduced into the substrate, and the graft ratio of the introduced graft chain is not particularly limited, but is 30% or more. More preferably.
- the amount of graft chains that interact with mercury can be increased in the resulting mercury ion adsorbent. Therefore, it is possible to obtain a mercury ion adsorbent having a high adsorption capacity.
- the graft ratio refers to the amount (weight percentage) of the monomer introduced by graft polymerization with respect to the particulate base material, and refers to a value calculated by the method described in the examples described later. .
- the graft ratio is more preferably 30% or more, further preferably 50% or more, and particularly preferably 70% or more.
- the shape of the particulate adsorbent used in the present invention is not particularly limited as long as it is particulate as in the case of the base material, and is preferably a spherical shape, an elliptical shape, an irregular crushing shape, or the like. Among these, the shape of the particulate adsorbent is more preferably spherical from the viewpoint of mechanical strength.
- the average particle size of the particulate adsorbent used in the present invention is preferably 100 ⁇ m or more and 1500 ⁇ m or less, more preferably 100 ⁇ m or more and 800 ⁇ m or less, and further preferably 200 ⁇ m or more and 500 ⁇ m or less.
- conventional adsorption towers for ion exchange / chelating resin spheres, regeneration facilities, etc. can be used as they are.
- the mercury ion adsorbent according to the present invention may be a particulate adsorbent obtained by introducing a graft chain polymerized using a monomer containing dialkylaminoalkyl (meth) acrylate into a particulate base material. Therefore, the proton ionized material after introduction is also included in the mercury ion adsorbent according to the present invention.
- the mercury ion adsorbent according to the present invention may be produced by any production method as long as it has the configuration (I).
- the mercury ion adsorbent according to the present invention can be produced by activating a particulate base material to generate radical active sites and introducing graft chains into the base material in which the radical active sites are generated. it can.
- the method for activating the substrate is not particularly limited as long as it is a method capable of generating radical active sites so that graft chains can be introduced in the subsequent graft chain introduction step.
- a method of chemically activating using a radical polymerization initiator a method of activating by irradiating with ionizing radiation, a method of activating by irradiating with ultraviolet rays, and activating by ultrasonic waves
- the method, the method of activating by plasma irradiation, etc. can be used.
- the method of irradiating with ionizing radiation has an advantage that the manufacturing process is simple, safe and low pollution.
- the graft chain can be introduced from the surface of the base material to the inside, and an adsorbent excellent in adsorption capacity can be obtained.
- the dose when activating by irradiating with ionizing radiation, is preferably 1 kGy or more and 200 kGy or less, and more preferably 100 kGy or more and 200 kGy or less.
- the dose of ionizing radiation is 1 kGy or more, a radical active site necessary for the substrate can be generated.
- the dose of ionizing radiation is 200 kGy or less, energy and irradiation time can be saved, so that the manufacturing cost can be reduced.
- Examples of the ionizing radiation include ⁇ -rays, ⁇ -rays, ⁇ -rays, electron beams, X-rays, etc.
- ⁇ -rays from cobalt-60 electron beams
- An electron beam, an X-ray, etc. by an accelerator can be used more suitably.
- an electron beam accelerator capable of performing irradiation of a thick material as the electron beam accelerator, and an electron beam having a medium energy to a high energy with an acceleration voltage of 1 MeV or more.
- An accelerator can be used suitably.
- an electron beam can be transmitted even with a medium to low energy electron beam accelerator of 1 MeV or less.
- the substrate can be activated.
- the irradiation with ionizing radiation is more preferably performed in an inert gas atmosphere such as nitrogen gas, neon gas, or argon gas. This is preferable because the graft chain can be effectively introduced.
- the irradiation with ionizing radiation is performed under cooling conditions of ⁇ 20 ° C. or more and 0 ° C. or less. This is preferable because the graft chain can be effectively introduced.
- the method for introducing the graft chain is not particularly limited.
- the solvent in the solution containing the monomer is not particularly limited, and examples thereof include water, alcohols such as ethanol, ketones such as acetone, and the like. Of these, the solvent is more preferably water.
- an organic solvent is not used, it is preferable from the viewpoints of cost reduction of the process, reduction of load on the environment, and improvement of process safety.
- ion-exchange water, a pure water, an ultrapure water etc. as water used here.
- the concentration of the monomer contained in the solution used in the introduction of the graft chain is not particularly limited, but is preferably 0.1M or more and 2M or less, more preferably 0.3M or more and 1.0M or less. More preferably.
- the monomer can be graft-polymerized on the substrate at a high graft ratio.
- the contact time between the activated substrate and the solution containing the monomer can also be shortened.
- the method for contacting the substrate with the solution containing the monomer is not particularly limited, and examples thereof include a method of immersing the activated substrate in the solution.
- the contact time between the activated substrate and the solution containing the monomer is preferably 30 minutes or more and 24 hours or less, more preferably 2 hours or more and 12 hours or less, when a dipping method is used as the contact method. is there.
- reaction temperature that is, the temperature at which the activated base material and the solution containing the monomer are brought into contact with each other is preferably 20 ° C. or higher and 80 ° C. or lower when a dipping method is used. Is 40 ° C. or more and 50 ° C. or less.
- the contact between the activated substrate and the solution containing the monomer is more preferably performed in an inert gas atmosphere such as nitrogen gas, neon gas, or argon gas. Thereby, reaction of a radical and oxygen can be prevented.
- an inert gas atmosphere such as nitrogen gas, neon gas, or argon gas.
- the particulate adsorbent can be used by being packed in a column or the like, and can be used repeatedly by desorption or regeneration, it is easy to handle in performing the adsorption operation.
- the method for treating a mercury ion-containing liquid according to the present invention can selectively adsorb mercury even in the presence of other divalent metal ions by using the particulate adsorbent.
- the method of bringing the particulate adsorbent into contact with the mercury ion-containing liquid is not particularly limited.
- the particulate adsorbent is put into the mercury ion-containing liquid and stirred or shaken.
- a method of mixing, a method of passing a mercury ion-containing liquid through a column or adsorption tower packed with the particulate adsorbent, and the like can be used.
- the mercury ion-containing liquid to be treated may be groundwater, soil, hot spring water, marsh lake water, seawater, factory wastewater, mine wastewater, river water or the like containing monovalent or divalent mercury ions.
- the method for treating a mercury ion-containing liquid according to the present invention further includes a pH adjustment step of adjusting the pH of the mercury ion-containing liquid to acid before bringing the particulate adsorbent into contact with the mercury ion-containing liquid.
- a pH adjustment step of adjusting the pH of the mercury ion-containing liquid to acid before bringing the particulate adsorbent into contact with the mercury ion-containing liquid.
- the pH of the mercury ion-containing liquid may be adjusted to be acidic, but more preferably adjusted to pH 1 or more and pH 5 or less, more preferably pH 1.5 or more and pH 4 or less.
- the particulate adsorbent after adsorbing mercury ions can be regenerated by contacting the eluent with strong acid such as hydrochloric acid or sulfuric acid to elute the mercury ions. Also, the eluted mercury can be recovered simultaneously.
- the particulate adsorbent after elution can be used again as an adsorbent after washing with an aqueous sodium hydroxide solution, pure water or the like.
- the method for treating a mercury ion-containing liquid according to the present invention is a mercury recovery step in which the particulate adsorbent after the mercury ions are adsorbed is brought into contact with an eluent such as a strong acid to elute and recover the mercury ions. May be included.
- the graft ratio of the particulate adsorbent (mercury ion adsorbent) of the present invention that is, the amount (weight percentage) of graft chains introduced to the substrate was determined by the following method.
- the particulate adsorbent into which the graft chain has been introduced is immersed in pure water for 48 hours. Unreacted monomer and homopolymer were removed. Thereafter, the particulate adsorbent was further washed by immersing in pure water for 12 hours and dried at 50 ° C. for 24 hours.
- the graft ratio was calculated from the weight (W g ) of the particulate adsorbent after drying and the dry weight (W 0 ) of the base material before introducing the graft chain by the following formula.
- the dry weight of the substrate before introducing the graft chain refers to the dry weight of the silanized inorganic fine particles before introducing the graft chain.
- Graft rate (%) ((W g ⁇ W 0 ) / W 0 ) ⁇ 100 [Example 1: Production of mercury ion adsorbent] 10 g of silanized silica gel spherical fine particles (manufactured by Merck & Co., Ltd., silica gel 60 for silanized column chromatography) (diameter 60-200 ⁇ m) are placed in a thin plastic bag, and the plastic bag is purged several times with nitrogen and sealed. did. Radical active sites were generated by irradiating this plastic bag with an electron beam at a dose of 100 kGy using an electron beam accelerator (NEPS Corporation, EPS-800) under a cooling condition with dry ice in a nitrogen atmosphere. .
- the irradiated silanized silica gel spherical fine particles are immediately immersed in an aqueous solution of 2- (dimethylamino) ethyl methacrylate (hereinafter sometimes referred to as “DMAEMA”) prepared in advance and nitrogen-substituted at 40 ° C. , Reacted for 8 hours.
- DMAEMA concentration of the used DMAEMA aqueous solution was 1M.
- the graft ratio of 2- (dimethylamino) ethyl methacrylate was 39% in the obtained particulate adsorbent (mercury ion adsorbent).
- the obtained particulate adsorbent (mercury ion adsorbent) was protonated with sodium hydroxide, washed with water, and then subjected to the following batch adsorption test.
- Example 2 Batch adsorption test of various heavy metal-containing liquids containing various heavy metals alone. Using the mercury ion adsorbent produced in Example 1, batch adsorption tests of various heavy metal-containing liquids shown below were performed.
- Example 3 Batch adsorption experiment of heavy metal mixture containing a mixture of various heavy metals
- the mercury ion adsorbent according to the present invention has a high adsorption capacity with respect to mercury ions not only when mercury ions exist alone but also when coexisting with other heavy metals. It became clear. From this result, it can be said that the mercury ion adsorbent according to the present invention selectively adsorbs mercury ions in water. Therefore, it can be seen that the mercury ion adsorbent according to the present invention can selectively and efficiently remove mercury from a liquid containing various kinds of heavy metals such as industrial wastewater.
- Example 4 Time characteristics of adsorption of mercury ions
- 0.1 g of the mercury ion adsorbent produced in Example 1 was added to 100 ml of the prepared 10 ppm mercury aqueous solution and stirred at room temperature for 10 minutes. Thereafter, the amount of mercury in the sampled supernatant was measured with an ICP emission spectrometer, and the amount of mercury adsorbed was determined from the initial concentration of mercury in the solution and the residual concentration after treatment.
- the same batch adsorption experiment was conducted by changing the stirring time from 10 minutes to 30 minutes, 1 hour, 2 hours, 4 hours, 8 hours, 18 hours, and 24 hours.
- the vertical axis indicates the amount of adsorption (unit:%, indicated as “Hg Recovery” in the figure), and the horizontal axis indicates the stirring time, that is, the adsorption time (unit: h (hour)), indicated in the figure as “Adsorption time” ).
- the mercury ion adsorbent according to the present invention is familiar to water, so that the adsorption to mercury ions is fast and the mercury ions in water can be efficiently removed.
- Example 5 pH dependence of mercury ion adsorption
- the vertical axis represents the amount of adsorption (unit:%, indicated as “Hg Recovery” in the figure), and the horizontal axis represents pH.
- the mercury ion adsorbent according to the present invention has a high adsorption capacity on the acidic side.
- the mercury ion adsorbent according to the present invention showed the highest adsorption capacity at pH 1.8.
- the mercury ion-containing liquid treatment method and the mercury ion adsorbent according to the present invention have excellent adsorption ability for mercury ions, and can selectively adsorb mercury ions, so that they are contaminated with mercury. It is very advantageous when industrially purifying soil, seawater, factory wastewater, hot spring water, mine wastewater, etc., and separating, concentrating and recovering mercury.
- the mercury ion adsorbent of the present invention has the same shape as conventional commercial ion exchange resin spheres / chelate resin spheres, an adsorption tower for ion exchange / chelate resin spheres, a regeneration facility, etc. can be used as they are. .
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Abstract
Description
本発明に係る水銀イオン吸着材は、粒子状の基材に、(メタ)アクリル酸ジアルキルアミノアルキルを含むモノマーを用いて重合したグラフト鎖が導入されてなる粒子状吸着材であればよい。
本発明に係る水銀イオン吸着材は、前記(I)の構成を有するものであればどのような製造方法によって製造されたものであってもよい。
本発明に係る水銀イオン含有液の処理方法は、前記粒子状吸着材を、水銀イオン含有液に接触させて、水銀イオンを前記粒子状吸着材に吸着させる工程を含んでいればよい。前記粒子状吸着材を用いることにより、水銀イオンを効率よく吸着することができる。
本発明の粒子状吸着材(水銀イオン吸着材)のグラフト率、すなわち、前記基材に対する、導入されているグラフト鎖の量(重量百分率)は、以下の方法で求めた。
グラフト率(%)=((Wg-W0)/W0)×100
〔実施例1:水銀イオン吸着材の製造〕
シラナイズドシリカゲル球状微粒子(メルク社製、シリカゲル60シラナイズド カラムクロマトグラフィー用)10g(直径60~200μm)を、薄いプラスチックバッグの中に配置して、このプラスチックバッグを、窒素で数回パージし封着した。このプラスチックバッグに、窒素雰囲気下、ドライアイスによる冷却条件下で、電子線加速器(NHVコーポレーション製、EPS-800)を用いて100kGyの線量の電子線を照射することによりラジカル活性点を生成させた。
実施例1で製造した水銀イオン吸着材を用いて以下に示す各種重金属含有液のバッチ吸着試験を行った。
実施例1で製造した水銀イオン吸着材を用いて以下のような水銀イオンのバッチ吸着実験を行った。
実施例1で製造した水銀イオン吸着材を用いて以下のような水銀イオンのバッチ吸着実験を行った。
Claims (10)
- 粒子状の基材に、(メタ)アクリル酸ジアルキルアミノアルキルを含むモノマーを用いて重合したグラフト鎖が導入されてなる粒子状吸着材を、水銀イオン含有液に接触させる工程を含むことを特徴とする水銀イオン含有液の処理方法。
- 前記(メタ)アクリル酸ジアルキルアミノアルキルは、(メタ)アクリル酸2-(ジメチルアミノ)エチル、(メタ)アクリル酸2-(ジエチルアミノ)エチル、および(メタ)アクリル酸2-(ジブチルアミノ)エチルからなる群より選択される少なくとも1つのモノマーであることを特徴とする請求項1に記載の水銀イオン含有液の処理方法。
- 前記粒子状の基材は、シラン化処理された無機微粒子であることを特徴とする請求項1または2に記載の水銀イオン含有液の処理方法。
- 前記シラン化処理は、前記無機微粒子の表面に有機基を形成することを特徴とする請求項3に記載の水銀イオン含有液の処理方法。
- 前記無機微粒子は、シリカ微粒子であることを特徴とする請求項3または4に記載の水銀イオン含有液の処理方法。
- 前記粒子状吸着材を水銀イオン含有液に接触させる前に、水銀イオン含有液のpHを酸性に調整するpH調整工程を含むことを特徴とする請求項1~5のいずれか1項に記載の水銀イオン含有液の処理方法。
- 粒子状の基材に、(メタ)アクリル酸ジアルキルアミノアルキルを含むモノマーを用いて重合したグラフト鎖が導入されてなることを特徴とする水銀イオン吸着材。
- 前記(メタ)アクリル酸ジアルキルアミノアルキルは(メタ)アクリル酸2-(ジメチルアミノ)エチル、(メタ)アクリル酸2-(ジエチルアミノ)エチル、および(メタ)アクリル酸2-(ジブチルアミノ)エチルからなる群より選択される少なくとも1つのモノマーであることを特徴とする請求項7に記載の水銀イオン吸着材。
- 前記粒子状の基材は、シラン化処理された無機微粒子であることを特徴とする請求項7または8に記載の水銀イオン吸着材。
- 前記無機微粒子は、シリカ微粒子であることを特徴とする請求項9に記載の水銀イオン吸着材。
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JP2019526440A (ja) * | 2016-08-26 | 2019-09-19 | ナンヤン・テクノロジカル・ユニバーシティー | Co2使用可能な応答性吸着材の再生及び再使用 |
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JP2019526440A (ja) * | 2016-08-26 | 2019-09-19 | ナンヤン・テクノロジカル・ユニバーシティー | Co2使用可能な応答性吸着材の再生及び再使用 |
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