JP2016155116A - Collector to remove radioactive material and porous material supporting it and device using them - Google Patents
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- prussian blue
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- 239000012857 radioactive material Substances 0.000 title abstract 2
- 239000011148 porous material Substances 0.000 title description 7
- 229920001046 Nanocellulose Polymers 0.000 claims abstract description 57
- 239000000126 substance Substances 0.000 claims abstract description 39
- 239000003463 adsorbent Substances 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims description 21
- 239000002516 radical scavenger Substances 0.000 claims description 14
- 239000000758 substrate Substances 0.000 claims description 13
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 4
- DCYOBGZUOMKFPA-UHFFFAOYSA-N iron(2+);iron(3+);octadecacyanide Chemical compound [Fe+2].[Fe+2].[Fe+2].[Fe+3].[Fe+3].[Fe+3].[Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] DCYOBGZUOMKFPA-UHFFFAOYSA-N 0.000 abstract description 65
- 239000013225 prussian blue Substances 0.000 abstract description 63
- 229960003351 prussian blue Drugs 0.000 abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 34
- 238000000034 method Methods 0.000 abstract description 11
- 238000010828 elution Methods 0.000 abstract description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 description 30
- 229920002451 polyvinyl alcohol Polymers 0.000 description 30
- 239000003795 chemical substances by application Substances 0.000 description 16
- 229910052792 caesium Inorganic materials 0.000 description 15
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 15
- 239000000203 mixture Substances 0.000 description 13
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 description 12
- 229920002472 Starch Polymers 0.000 description 12
- 229910052776 Thorium Inorganic materials 0.000 description 12
- 229910021536 Zeolite Inorganic materials 0.000 description 12
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 12
- 239000006185 dispersion Substances 0.000 description 12
- 239000008107 starch Substances 0.000 description 12
- 235000019698 starch Nutrition 0.000 description 12
- 239000010457 zeolite Substances 0.000 description 12
- 239000000243 solution Substances 0.000 description 11
- 229910052712 strontium Inorganic materials 0.000 description 11
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 11
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 9
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- 239000008367 deionised water Substances 0.000 description 8
- 229910021641 deionized water Inorganic materials 0.000 description 8
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 8
- 239000000941 radioactive substance Substances 0.000 description 8
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- 238000000411 transmission spectrum Methods 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 239000000835 fiber Substances 0.000 description 6
- -1 iron (III) ions Chemical class 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 5
- 239000011630 iodine Substances 0.000 description 5
- 229910052740 iodine Inorganic materials 0.000 description 5
- 239000011259 mixed solution Substances 0.000 description 5
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 4
- 230000002285 radioactive effect Effects 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 239000000783 alginic acid Substances 0.000 description 3
- 229920000615 alginic acid Polymers 0.000 description 3
- 235000010443 alginic acid Nutrition 0.000 description 3
- 229960001126 alginic acid Drugs 0.000 description 3
- 150000004781 alginic acids Chemical class 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000012790 confirmation Methods 0.000 description 3
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- 238000002474 experimental method Methods 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
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- 239000004576 sand Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 229920002994 synthetic fiber Polymers 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- CIOAGBVUUVVLOB-NJFSPNSNSA-N Strontium-90 Chemical compound [90Sr] CIOAGBVUUVVLOB-NJFSPNSNSA-N 0.000 description 2
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- UETZVSHORCDDTH-UHFFFAOYSA-N iron(2+);hexacyanide Chemical compound [Fe+2].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] UETZVSHORCDDTH-UHFFFAOYSA-N 0.000 description 2
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- 239000000725 suspension Substances 0.000 description 2
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- PNDPGZBMCMUPRI-HVTJNCQCSA-N 10043-66-0 Chemical compound [131I][131I] PNDPGZBMCMUPRI-HVTJNCQCSA-N 0.000 description 1
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- 229910017108 Fe—Fe Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 244000061456 Solanum tuberosum Species 0.000 description 1
- 235000002595 Solanum tuberosum Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000012237 artificial material Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- NCMHKCKGHRPLCM-UHFFFAOYSA-N caesium(1+) Chemical compound [Cs+] NCMHKCKGHRPLCM-UHFFFAOYSA-N 0.000 description 1
- TVFDJXOCXUVLDH-RNFDNDRNSA-N cesium-137 Chemical compound [137Cs] TVFDJXOCXUVLDH-RNFDNDRNSA-N 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
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- 230000003588 decontaminative effect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
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- 125000000524 functional group Chemical group 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- PANJMBIFGCKWBY-UHFFFAOYSA-N iron tricyanide Chemical compound N#C[Fe](C#N)C#N PANJMBIFGCKWBY-UHFFFAOYSA-N 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
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- 229920000728 polyester Polymers 0.000 description 1
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- 229920001282 polysaccharide Polymers 0.000 description 1
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- 238000007670 refining Methods 0.000 description 1
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- 239000011347 resin Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- GTSHREYGKSITGK-UHFFFAOYSA-N sodium ferrocyanide Chemical compound [Na+].[Na+].[Na+].[Na+].[Fe+2].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] GTSHREYGKSITGK-UHFFFAOYSA-N 0.000 description 1
- 239000000264 sodium ferrocyanide Substances 0.000 description 1
- 235000012247 sodium ferrocyanide Nutrition 0.000 description 1
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- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
Landscapes
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Water Treatment By Sorption (AREA)
- Treatment Of Liquids With Adsorbents In General (AREA)
- Removal Of Specific Substances (AREA)
Abstract
Description
本発明は、セシウム、ヨウ素、トリウム、又はストロンチウム等の化学物質を低減ないし除去するために用いる捕集剤並びにこれを用いた方法及び装置に関するものである。 The present invention relates to a collection agent used for reducing or removing chemical substances such as cesium, iodine, thorium, or strontium, and a method and apparatus using the same.
セシウム、ヨウ素、トリウム、又はストロンチウム等の化学物質、特にセシウム１３７、ヨウ素１３１、ストロンチウム９０等の放射性物質によって汚染された水から、これらの放射性物質を除去ないし低減する手段として、これらの放射性物質を取り込むように設計されたゼオライトを用いる技術がある（例えば、特許文献１参照）。
また、ゼオライトよりもセシウムに対して高い結合力及び選択性を有するプルシアンブルー並びにその類似化合物を用いる技術や、ストロンチウムに対して高い結合力を示すアルギン酸のような高分子多糖類を用いる技術も提案されている（例えば、特許文献２参照）。
As a means of removing or reducing these radioactive substances from water contaminated by chemical substances such as cesium, iodine, thorium, or strontium, especially radioactive substances such as cesium 137, iodine 131, strontium 90, etc. There is a technique using a zeolite designed to be incorporated (see, for example, Patent Document 1).
Also proposed is a technology that uses Prussian blue and its similar compounds, which have a higher binding power and selectivity to cesium than zeolite, and a technology that uses a high molecular weight polysaccharide such as alginic acid that has a higher binding power to strontium. (For example, refer to Patent Document 2).
しかしながら、ゼオライトは選択性が低いため、これを用いる方法による場合には目詰まりしたゼオライトを頻繁に交換しなければならず高コストになってしまい、さらには、低減ないし除去の対象となる化学物質が放射性物質である場合には、交換作業は容易ではないという問題がある。他方で、プルシアンブルー及びその類似化合物を使用する場合や、微小サイズのゼオライト（以下、単に「ゼオライト」という。）を使用する場合には、これらの物質が水に溶出しやすいという問題（以下「溶出問題」という。）があり、例えば、ウレタンやポリビニルアルコールの多孔質体へ安定的に担持させることが困難であった。 However, since zeolite has low selectivity, clogged zeolite must be replaced frequently when using the method using this, and the cost becomes high, and furthermore, chemical substances to be reduced or removed. If is a radioactive substance, there is a problem that the replacement work is not easy. On the other hand, when Prussian blue and its similar compounds are used, or when a small-size zeolite (hereinafter simply referred to as “zeolite”) is used, the problem that these substances are easily eluted in water (hereinafter “ For example, it was difficult to stably carry it on a porous body of urethane or polyvinyl alcohol.
本発明は、汚染水等に含まれる放射性物質等の標的とする化学物質（例えば、セシウム、トリウム、ストロンチウム、ヨウ素等）を低減ないし除去するための、捕集剤並びにこれを用いた方法及び装置を提供することを課題とする。また、プルシアンブルーやゼオライト等の吸着剤を使用した場合の溶出問題を解決することを課題とする。さらに、以上の課題を低コストで実現することを課題とする。 The present invention relates to a scavenger and a method and apparatus using the same for reducing or removing a target chemical substance (eg, cesium, thorium, strontium, iodine, etc.) such as radioactive substances contained in contaminated water. It is an issue to provide. It is another object of the present invention to solve the elution problem when adsorbents such as Prussian blue and zeolite are used. Further, it is an object to realize the above problems at a low cost.
本発明者は、溶出問題の原因は、プルシアンブルー及びその類似化合物がナノサイズであることや親水性が高いことにあるであろうとの考察の下、まず、ナノセルロースに対して鉄（III）イオンを結合させ、ナノセルロースと鉄（III）イオンの疑似錯体を形成させた後、かかる疑似錯体に対しヘキサシアノ鉄（II)酸等を結合させることで、ナノセルロース／プルシアンブルー疑似錯体を形成させた（図１及び図２参照）。そして、本発明者は、プルシアンブルーがナノセルロース／プルシアンブルー疑似錯体においてナノセルロースと疑似錯体を形成しているため、プルシアンブルー単独では水等の溶媒へ溶出せず、プルシアンブルー等の吸着剤を使用した場合の溶出問題を解決できることを見いだし、本発明を完成させた。本発明において吸着剤としてプルシアンブルーを使用した場合の、当該プルシアンブルーは、ナノセルロースをいわば鋳型として用いて合成した、不溶性プルシアンブルーといえる。
また、本発明者は、ナノセルロースには水酸基が含まれることから親水性基材に安定的に担持させられるだろうとの考察の下、ナノセルロース／プルシアンブルー疑似錯体を親水性基材に安定的に担持させることができることをも見いだした（図３参照）。
The present inventor firstly considered that the cause of the elution problem would be that Prussian blue and its similar compounds are nano-sized and highly hydrophilic. After binding ions to form a pseudo complex of nanocellulose and iron (III) ions, a nano cellulose / Prussian blue pseudo complex is formed by binding hexacyanoferrate (II) acid or the like to the pseudo complex. (See FIGS. 1 and 2). And, since the Prussian blue forms a pseudo-complex with nanocellulose in the nanocellulose / Prussian blue pseudo complex, the present inventor does not elute into a solvent such as water by using Prussian blue alone. It was found that the elution problem when used could be solved, and the present invention was completed. In the present invention, when Prussian blue is used as the adsorbent, the Prussian blue can be said to be insoluble Prussian blue synthesized using nanocellulose as a template.
In addition, the present inventor considered that nanocellulose / Prussian blue pseudo-complex is stable on a hydrophilic substrate under the consideration that the nanocellulose contains a hydroxyl group and will be stably supported on the hydrophilic substrate. It has also been found that it can be supported on the substrate (see FIG. 3).
本発明によれば、汚染水等に含まれる標的とする化学物質を吸着・保持することで、汚染水等に含まれる標的とする化学物質を低減ないし除去することができる。例えば、セシウム、トリウム、ストロンチウム又はヨウ素、特に、放射性物質セシウム、放射性トリウム、放射性ストロンチウムによって汚染された汚染水中の放射性物質を、吸着・保持することで取り除くことができる。また、本発明によれば、吸着剤としてプルシアンブルーやゼオライト等を使用した場合の溶出問題を低減ないし防ぐことができる。さらに、本発明によれば、加工が容易な親水性基材に対して吸着剤（例えば、プルシアンブルー）とナノセルロース分散物とを含む捕集剤を安定的に担持させることで、捕集剤を担持させた親水性基材を最適な態様へ容易に加工することができる。
また、本発明によれば、以上の効果を低コストで実現することができる。
According to the present invention, the target chemical substance contained in the contaminated water or the like can be reduced or removed by adsorbing and holding the target chemical substance contained in the contaminated water or the like. For example, radioactive substances in contaminated water contaminated with cesium, thorium, strontium or iodine, particularly radioactive substances cesium, radioactive thorium and radioactive strontium can be removed by adsorption and retention. Moreover, according to the present invention, it is possible to reduce or prevent elution problems when Prussian blue, zeolite, or the like is used as the adsorbent. Furthermore, according to the present invention, the collection agent containing the adsorbent (for example, Prussian blue) and the nanocellulose dispersion is stably supported on the easily processed hydrophilic base material. It is possible to easily process the hydrophilic base material supporting the base material into an optimum mode.
Moreover, according to the present invention, the above effects can be realized at low cost.
以下、本発明の実施形態を説明する。ただし、以下の実施形態は、発明内容の理解を助けるためのものであり、本発明を限定するものではない。 Embodiments of the present invention will be described below. However, the following embodiments are for helping understanding of the contents of the invention and do not limit the present invention.
＜捕集剤＞
本発明における捕集剤は、ナノセルロースと吸着剤（例えば、プルシアンブルー、ゼオライト、アルギン酸等のキレート形成物質等）との疑似錯体であり、標的とする化学物質（例えば、セシウム、トリウム、ストロンチウム、ヨウ素等）に対して高い結合力ないし選択性を有する一種類又は複数種類の吸着剤（例えば、プルシアンブルー等）を含む捕集剤である。ここでいうナノセルロース／吸着剤の疑似錯体は、ナノセルロースに対して鉄（III）イオン等の陽イオンを結合させ、ナノセルロースと陽イオンの疑似錯体を形成させた後、かかる疑似錯体に対してヘキサシアノ鉄（II)酸などの錯イオンを結合させることで形成され、例えば、ナノセルロースとプルシアンブルーの疑似錯体がある。また、本発明における捕集剤では、複数種類の吸着剤を組み合わせても良いため、例えば、ナノセルロース、プルシアンブルー、及びゼオライトからなる疑似錯体や、ナノセルロース、プルシアンブルー、及びアルギン酸からなる疑似錯体がある。
<Collector>
The scavenger in the present invention is a pseudo complex of nanocellulose and an adsorbent (for example, a chelate-forming substance such as Prussian blue, zeolite, alginic acid, etc.), and a target chemical substance (for example, cesium, thorium, strontium, It is a scavenger containing one or more kinds of adsorbents (for example, Prussian blue etc.) having a high binding power or selectivity to iodine. The nano-cellulose / adsorbent pseudo-complex here refers to a nano-cellulose cation such as iron (III) ion bound to form a pseudo-complex of nano-cellulose and a cation, and then to the pseudo-complex. For example, a pseudo complex of nanocellulose and Prussian blue is formed by combining complex ions such as hexacyanoferrate (II) acid. Further, since the collection agent in the present invention may be combined with a plurality of types of adsorbents, for example, a pseudo complex composed of nanocellulose, Prussian blue, and zeolite, or a pseudo complex composed of nano cellulose, Prussian blue, and alginic acid. There is.
本発明におけるナノセルロースとは、市販のセルロース（α-セルロース、酢酸セルロース等）を、アトライター、ボールミル、サンドミル、ビーズミル等の微細化処理装置を用いて平均の長さが１０μｍから１０００μｍ程度であり平均の直径が１nmから８００nm程度になるまで微細化したものを意味する。また、本発明におけるナノセルロース分散物は、市販のセルロース（α-セルロース、酢酸セルロース等）を、脱イオン水又はその他の分散媒体と共に、アトライター、ボールミル、サンドミル、ビーズミル等の微細化処理装置を用いて、溶媒内にセルロースを分散させる処理（以下「分散処理」という。）をすることで得ることができる。 The nanocellulose in the present invention is a commercially available cellulose (α-cellulose, cellulose acetate, etc.) having an average length of about 10 μm to 1000 μm using a refining processing device such as an attritor, ball mill, sand mill, bead mill or the like. This means that the average diameter is reduced to 1 nm to about 800 nm. In addition, the nanocellulose dispersion in the present invention is a commercially available cellulose (α-cellulose, cellulose acetate, etc.) and, together with deionized water or other dispersion media, a refinement processing apparatus such as an attritor, ball mill, sand mill, or bead mill. And can be obtained by carrying out a treatment for dispersing the cellulose in the solvent (hereinafter referred to as “dispersion treatment”).
ナノセルロース分散物の分散媒体としては、親水性溶媒を使用することができ、例えば、水、メタノール、エタノール、エチレングリコール、プロピレングリコール、グリセリンを使用することができる。また、分散処理は、例えば、ナノセルロースと脱イオン水を、セルロースが脱イオン水に対して０．０１〜１０ｗｔ％の量比になるように調整し、アトライター、ボールミル、サンドミル、ビーズミル等を用いて混合することによって調製することができる。なお、ここでいう「分散」とは、溶解や懸濁を含む広義の分散を意味し、例えば、ナノセルロースが全て溶解している態様、全て懸濁している態様、一部が溶解し一部が懸濁している態様等を意味する。 As a dispersion medium for the nanocellulose dispersion, a hydrophilic solvent can be used, and for example, water, methanol, ethanol, ethylene glycol, propylene glycol, and glycerin can be used. In addition, the dispersion treatment is performed, for example, by adjusting nanocellulose and deionized water so that the cellulose has an amount ratio of 0.01 to 10 wt% with respect to deionized water, and adding attritor, ball mill, sand mill, bead mill, etc. It can be prepared by using and mixing. The term “dispersion” as used herein means a broad sense of dispersion including dissolution and suspension. For example, an embodiment in which nanocellulose is completely dissolved, an embodiment in which all nanocellulose is suspended, and a portion in which some are dissolved. Means an embodiment in which is suspended.
本発明でナノセルロースと疑似錯体を形成するプルシアンブルーとしては、ヘキサシアノ鉄（II）塩化鉄（III）、フェロシアン化鉄（III）又はフェロシアン化鉄（II）と呼ばれるシアノ錯体やこれらの類似体を利用することができる。セシウムイオン等の標的とする化学物質に対して高い結合定数を有し標的とする化学物質と錯体ないし疑似錯体を形成することができる性質を有すればよく、特定の配位状態や配位数を持つ錯体ないし疑似錯体には限定されない。また、本発明で利用するプルシアンブルーとしては、その平均の粒径が１ｎｍ〜２００ｎｍであれば良いが、１０ｎｍ〜２０ｎｍであることが好ましい。 In the present invention, Prussian blue that forms a pseudo complex with nanocellulose includes hexacyano iron (II) iron chloride (III), ferrocyanide iron (III), ferric cyanide complex and their similar The body can be used. It only needs to have a high binding constant for the target chemical substance such as cesium ion and the ability to form a complex or pseudo complex with the target chemical substance. It is not limited to the complex or pseudo complex having The Prussian blue used in the present invention may have an average particle diameter of 1 nm to 200 nm, but is preferably 10 nm to 20 nm.
本発明における標的とする化学物質とは、水中や土中に含まれる化学物質を意味し、例えば、セシウム、トリウム、ストロンチウム、ヨウ素が挙げられ、特に、放射性物質セシウム、放射性トリウム、放射性ストロンチウム、放射性ヨウ素が挙げられる。 The target chemical substance in the present invention means a chemical substance contained in water or soil, and includes, for example, cesium, thorium, strontium, iodine, and in particular, radioactive substance cesium, radioactive thorium, radioactive strontium, radioactive Iodine is mentioned.
本発明における捕集剤は、前記ナノセルロース分散物の濃度が０．０１〜１０ｗｔ％及びプルシアンブルー（MW = ８５９．２３ｇ／ｍｏｌ）の濃度が１．０ｍＭ〜０．５Ｍとなるようにし、分散処理前のナノセルロース１質量部に対してプルシアンブルーを０．１〜１００質量部の比率にすることで、適当な媒体中で調製することができる。さらに、好ましくは水中で混合することで調製することができる。混合工程には特別な条件を必要とはせず、例えば、混合物全量が１０リットルの場合は、４℃〜４５℃で、３０〜１２０分間の範囲で適宜調整することができる。このようにして調製される捕集剤は、ナノセルロース・プルシアンブルー疑似錯体のコロイド溶液として表すこともできる。 The collecting agent in the present invention is dispersed so that the concentration of the nanocellulose dispersion is 0.01 to 10 wt% and the concentration of Prussian blue (MW = 859.23 g / mol) is 1.0 mM to 0.5 M. By setting the ratio of Prussian blue to 0.1 to 100 parts by mass with respect to 1 part by mass of nanocellulose before treatment, it can be prepared in a suitable medium. Furthermore, it can be preferably prepared by mixing in water. No special conditions are required for the mixing step. For example, when the total amount of the mixture is 10 liters, it can be appropriately adjusted at 4 ° C. to 45 ° C. for 30 to 120 minutes. The scavenger prepared in this way can also be expressed as a colloidal solution of nanocellulose and Prussian blue pseudo-complex.
本発明では、捕集剤を担持させた親水性基材を用いて、汚染水等の水溶液中に含まれる又は固体に付着した（以下、単に「汚染水等に含まれる」という。）標的とする化学物質を吸着・保持して、汚染水等に含まれる標的とする化学物質を低減ないし除去することができる。 In the present invention, using a hydrophilic base material carrying a scavenger, a target contained in an aqueous solution such as contaminated water or attached to a solid (hereinafter simply referred to as “contained in contaminated water”). The target chemical substance contained in the contaminated water or the like can be reduced or removed by adsorbing and holding the chemical substance.
＜親水性基材＞
本発明では、捕集剤を担持させる基材として、親水性基材を使用できる。本発明における親水性基材としては、親水性多孔質体や親水性繊維がある。親水性多孔質体や親水性繊維は、天然の材料、人工の材料及び／又は合成の材料を含むことができ、また、天然のセルロースから製造された合成繊維などの天然材料から製造された合成材料を含むことができる。また、親水性多孔質体や親水性繊維は、ナイロンなどのポリアミド、ポリエチレンやポリプロピレンなどのポリオレフィン、アクリル、モドアクリル、ゴム、プラスチック、熱可塑性プラスチック、ポリビニルアルコール、ポリエステル、ポリウレタン、ポリエーテルウレタン、ポリ塩化ビニル、ビニルニトリル、シリコン、ラテックス、それらの誘導体及びそれらの組み合わせ、並びにその他の吸収性の材料から形成することができる。吸着剤としてプルシアンブルーを用いた捕集剤を用いる場合には、親水性基材としてはポリビニルアルコールが好ましい。
<Hydrophilic substrate>
In the present invention, a hydrophilic substrate can be used as a substrate on which the scavenger is supported. Examples of the hydrophilic substrate in the present invention include a hydrophilic porous body and a hydrophilic fiber. Hydrophilic porous bodies and hydrophilic fibers can include natural materials, artificial materials and / or synthetic materials, and synthetic materials made from natural materials such as synthetic fibers made from natural cellulose. Material can be included. In addition, hydrophilic porous materials and hydrophilic fibers include polyamides such as nylon, polyolefins such as polyethylene and polypropylene, acrylics, modal acrylics, rubbers, plastics, thermoplastics, polyvinyl alcohol, polyesters, polyurethanes, polyether urethanes, polychlorinated resins. It can be formed from vinyl, vinyl nitrile, silicon, latex, their derivatives and combinations thereof, and other absorbent materials. When a trapping agent using Prussian blue is used as the adsorbent, polyvinyl alcohol is preferable as the hydrophilic substrate.
本発明の作用メカニズムの詳細は明らかではないが、以下のようなものが考えられる。すなわち、本発明者は、プルシアンブルー等の吸着剤がナノセルロースに対して高い親和性を有すること、並びに、ナノセルロース／プルシアンブルー疑似錯体（図２）やナノセルロース／その他の吸着剤の疑似錯体が、広範囲のｐＨ及び温度において安定的であることを見いだした。また、本発明者は、平均の長さが約５μｍであり平均の直径が約４〜８００ｎｍであるナノセルロース１質量部に対して平均の直径が１０〜２００nm未満のプルシアンブルーが５質量部以上結合できることを見いだした。このため、ナノセルロースとプルシアンブルー等の吸着剤との間の疑似錯体の形成が、ナノセルロース／吸着剤の疑似錯体にとって、重要な相互作用となっていると考えられる。
また、本発明者は、プルシアンブルー等の吸着剤をポリビニルアルコール等の親水性基材の材料に加えた場合、プルシアンブルーやゼオライト等の吸着剤を単独でポリビニルアルコール等の親水性基材の材料に加え多孔質体や繊維を形成した場合と比べ、ポリビニルアルコール等の親水性基材に担持されるプルシアンブルーやゼオライト等の吸着剤の質量比が増加することを見いだした。そのメカニズムとしては、プルシアンブルー等の吸着剤と疑似錯体を形成しているナノセルロースが有する水酸基がポリビニルアルコール等の親水性基材が有する水酸基等の官能基と反応することで、ナノセルロース／吸着剤の疑似錯体が、ポリビニルアルコール多孔質体等の親水性基材に安定的に担持されるものと考えられる。
Although the details of the working mechanism of the present invention are not clear, the following can be considered. That is, the present inventor has shown that adsorbents such as Prussian blue have high affinity for nanocellulose, and that nanocellulose / Prussian blue pseudocomplex (FIG. 2) and nanocellulose / other adsorbent pseudocomplexes. Has been found to be stable over a wide range of pHs and temperatures. In addition, the present inventor found that 5 parts by mass of Prussian blue having an average diameter of less than 10 to 200 nm with respect to 1 part by mass of nanocellulose having an average length of about 5 μm and an average diameter of about 4 to 800 nm. I found that they could be combined. For this reason, the formation of a pseudo complex between nanocellulose and an adsorbent such as Prussian blue is considered to be an important interaction for the nano cellulose / adsorbent pseudo complex.
In addition, when the present inventors added an adsorbent such as Prussian blue to a hydrophilic base material such as polyvinyl alcohol, the adsorbent such as Prussian blue or zeolite alone is a hydrophilic base material such as polyvinyl alcohol. In addition, it was found that the mass ratio of adsorbents such as Prussian blue and zeolite supported on a hydrophilic base material such as polyvinyl alcohol is increased as compared with the case where a porous body or fiber is formed. The mechanism is that the hydroxyl group of the nanocellulose forming a pseudo complex with an adsorbent such as Prussian blue reacts with the functional group such as the hydroxyl group of a hydrophilic base material such as polyvinyl alcohol, so that nanocellulose / adsorption It is considered that the pseudo complex of the agent is stably supported on a hydrophilic substrate such as a polyvinyl alcohol porous body.
本発明では、標的とする化学物質を含む水溶液に、ナノセルロース／吸着剤の疑似錯体と親水性基材から構成されている多孔質体（以下、単に「スポンジ状捕集剤」と略称する）を加え、標的とする化学物質がスポンジ状捕集体中の吸着剤と優先的に複合体を形成することで、標的とする化学物質を低減ないし除去することができる。 In the present invention, a porous body composed of a nanocellulose / adsorbent pseudo-complex and a hydrophilic substrate in an aqueous solution containing a target chemical substance (hereinafter simply referred to as “sponge-like collecting agent”). And the target chemical substance forms a complex preferentially with the adsorbent in the sponge-like collector, whereby the target chemical substance can be reduced or removed.
本発明において標的とする化学物質を含む水溶液の電解質濃度は、天然の海水における塩濃度よりも高い範囲でも良く、例えば、溶液の質量％が３％以上となっても良い。また、本発明は、電解質を加えたり、電解質を含まない水を加えたりして、溶液中の塩濃度を調節する工程を含んでいてもよい。 The electrolyte concentration of the aqueous solution containing the target chemical substance in the present invention may be in a range higher than the salt concentration in natural seawater. For example, the mass% of the solution may be 3% or more. Moreover, this invention may include the process of adding the electrolyte or adding the water which does not contain an electrolyte, and adjusting the salt concentration in a solution.
本発明で用いられるスポンジ状捕集剤は、標的とする化学物質（例えば、セシウム、トリウム、ストロンチウム、ヨウ素等）を含む溶液と、容積比１：１０〜１：１００００で適当な容器（例えば、タンク、槽等）内で混合することで、溶液中のセシウム等の標的とする化学物質を捕捉して、捕集剤と複合体を形成することができる。混合には特別の条件や手段を必要とはしないが、約４℃〜５０℃、５分間〜１時間の範囲で適宜調整して混合すればよく、必要に応じて攪拌を行なってもよい。 The sponge-like collecting agent used in the present invention is a suitable container (for example, a volume ratio of 1:10 to 1: 10000) with a solution containing a target chemical substance (for example, cesium, thorium, strontium, iodine, etc.). By mixing in a tank, tank, etc., a target chemical substance such as cesium in the solution can be captured to form a complex with the scavenger. The mixing does not require special conditions or means, but may be appropriately adjusted and mixed within a range of about 4 ° C. to 50 ° C. and 5 minutes to 1 hour, and may be stirred as necessary.
ナノセルロース／吸着剤の疑似錯体と親水性基材から構成されている多孔質体はスポンジ状ないしはスポンジ様の構造を取ることもできるため、セシウムやトリウム等の標的とする化学物質の吸着処理をした後、スポンジ状捕集剤を機械的に取り出すことで回収することができる。 Porous materials composed of nanocellulose / adsorbent pseudo-complexes and hydrophilic substrates can have a sponge-like or sponge-like structure, so that target chemical substances such as cesium and thorium can be adsorbed. After that, it can be recovered by mechanically removing the sponge-like collecting agent.
本発明におけるスポンジ状捕集剤は、圧縮又は熱処理することで体積を減量することができる。 The sponge-like collection agent in the present invention can be reduced in volume by compression or heat treatment.
本発明では、スポンジ状捕集剤に含まれるプルシアンブルーによって、汚染水等の水溶液中に含まれる標的とする化学物質を吸着・保持して、汚染水等の水溶液中に含まれる標的とする化学物質の濃度を低減ないし除去することができる。 In the present invention, the target chemical substance contained in the aqueous solution such as contaminated water is adsorbed and retained by the Prussian blue contained in the sponge-like collecting agent to target the chemical substance contained in the aqueous solution such as contaminated water. The concentration of the substance can be reduced or removed.
親水性基材を親水性多孔質体とする場合には、プルシアンブルー等の吸着剤とナノセルロースからなる捕集剤と親水性多孔質体の材料とを混合した後、親水性多孔質体の材料を公知の方法で発泡させることで作製することができる。吸着剤をプルシアンブルーとし、親水性多孔質体をポリビニルアルコールとする場合、ポリビニルアルコールに対する捕集剤の質量比は、２．５〜５０％とすることが好ましい。また、親水性基材を親水性繊維とする場合には、捕集剤と親水性繊維の材料とを混合した後、捕集剤を親水性繊維に公知の方法で浸漬し含浸させることで作製することができる。 When the hydrophilic base material is a hydrophilic porous body, after mixing an adsorbent such as Prussian blue, a collection agent composed of nanocellulose, and a material of the hydrophilic porous body, It can be produced by foaming the material by a known method. When the adsorbent is Prussian blue and the hydrophilic porous body is polyvinyl alcohol, the mass ratio of the scavenger to polyvinyl alcohol is preferably 2.5 to 50%. In addition, when the hydrophilic base material is a hydrophilic fiber, it is prepared by mixing the trapping agent and the hydrophilic fiber material, and then dipping the impregnating agent into the hydrophilic fiber by a known method and impregnating it. can do.
＜ヨウ素除去用基材＞
本発明は、セシウム、トリウム、ストロンチウム等の標的とする化学物質の濃度を低減ないし除去する工程と前後若しくは並行して、汚染水等に含まれるヨウ素濃度を低減ないし除去する工程を含んでいてもよい。この工程は、捕集剤を担持させた親水性基材にヨウ素を含む溶液を流通させることで行なうことができ、セシウムやトリウム等の標的とする化学物質の濃度を低減ないし除去する前後いずれの溶液に対しても行うことができる。
<Base material for iodine removal>
The present invention may include a step of reducing or removing iodine concentration contained in contaminated water etc. before or after or in parallel with the step of reducing or removing the concentration of the target chemical substance such as cesium, thorium, strontium, etc. Good. This step can be performed by circulating a solution containing iodine on a hydrophilic base material carrying a scavenger, before or after reducing or removing the concentration of a target chemical substance such as cesium or thorium. It can also be performed on a solution.
捕集剤及び親水性基材は、いずれも適当な径の管、筒、棟等の液体が流通可能な適当な容器に充填して使用することができる。また、放射性物質等を除染するための装置の一部として使用することもできる。 Both the collecting agent and the hydrophilic base material can be used by being filled in an appropriate container through which a liquid such as a tube, tube, or ridge having an appropriate diameter can flow. It can also be used as part of an apparatus for decontaminating radioactive substances.
以下、本発明の実施例及び比較例を説明する。ただし、以下の実施例は、発明の内容の理解を助けるためのものであり、本発明を限定するものではない。 Examples of the present invention and comparative examples will be described below. However, the following examples are for helping understanding of the contents of the invention and do not limit the present invention.
＜プルシアンブルーの溶出確認実験＞
（実施例１）
１）ナノセルロース分散液の調製
１リットルの脱イオン水に、セルロース粉末５０ｇを加え、セルロースの粒が目視できない程度になるまで十分に分散処理を行い、ナノセルロース分散液を得た。
<Prussian blue elution confirmation experiment>
Example 1
1) Preparation of nanocellulose dispersion liquid 50 g of cellulose powder was added to 1 liter of deionized water, and the dispersion was sufficiently dispersed until cellulose particles were not visible to obtain a nanocellulose dispersion liquid.
２）ポリビニルアルコール水溶液の調製
２００ｍLの脱イオン水に２０ｇのポリビニルアルコールを加えた後、１５０ｒｐｍで常に撹拌しながら９０℃の水で３時間温浴加熱し、ポリビニルアルコール水溶液を調製した。
2) Preparation of aqueous polyvinyl alcohol solution After adding 20 g of polyvinyl alcohol to 200 mL of deionized water, the mixture was heated in a water bath at 90 ° C. for 3 hours with constant stirring at 150 rpm to prepare an aqueous polyvinyl alcohol solution.
３）デンプン／ポリビニルアルコール混合液の調製
市販のジャガイモ由来のデンプン１０ｇとトウモロコシ由来のデンプン１０ｇを、１００ｍLの脱イオン水に加え撹拌した後、これに２）で調製したポリビニルアルコール水溶液を加えてデンプン／ポリビニルアルコール混合液を調製した。次に、このデンプン／ポリビニルアルコール混合液を２００ｒｐｍで常に撹拌しながら９０℃の水で４５分間温浴加熱し、透明なデンプン／ポリビニルアルコール混合液を調製した。
3) Preparation of starch / polyvinyl alcohol mixed solution 10 g of commercially available potato-derived starch and 10 g of corn-derived starch were added to 100 mL of deionized water and stirred, and then the polyvinyl alcohol aqueous solution prepared in 2) was added thereto and starch was added. A polyvinyl alcohol mixture was prepared. Next, this starch / polyvinyl alcohol mixture was heated in a water bath at 90 ° C. for 45 minutes with constant stirring at 200 rpm to prepare a transparent starch / polyvinyl alcohol mixture.
４）ナノセルロース／塩化鉄（III）混合液の調製
０．９６Ｍ塩化鉄（III）１０ｍＬに対して、上記１）のナノセルロース分散液１００ｍＬを添加・攪拌し、塩化鉄（III）／ナノセルロース混合液を調製した。
4) Preparation of nanocellulose / iron (III) chloride mixed solution To 10 mL of 0.96M iron (III) chloride, 100 mL of the nanocellulose dispersion of 1) above was added and stirred to obtain iron (III) chloride / nanocellulose. A mixture was prepared.
５）ナノセルロース／プルシアンブルー／デンプン／ポリビニルアルコール混合液の調製
４）で調製したナノセルロースナノセルロース／塩化鉄（III）混合液に０．７２Ｍフェロシアン化ナトリウムを１０ｍＬ加え撹拌し、均一に懸濁させた後、このナノセルロース／プルシアンブルー混合液の懸濁混合液３０ｍＬを、３）で調製したデンプン／ポリビニルアルコール混合液に加え、ナノセルロース／プルシアンブルー／デンプン／ポリビニルアルコール混合液を調製した。この混合液を、容積が２５０ｍLになるまで、３００ｒｐｍで常に撹拌しながら９０℃の水で温浴加熱した。
5) Preparation of nanocellulose / Prussian blue / starch / polyvinyl alcohol mixed solution 10mL of 0.72M sodium ferrocyanide was added to the nanocellulose nanocellulose / iron (III) chloride mixed solution prepared in 4), and stirred uniformly. After turbidity, 30 mL of the suspension mixture of the nanocellulose / Prussian blue mixture was added to the starch / polyvinyl alcohol mixture prepared in 3) to prepare a nanocellulose / Prussian blue / starch / polyvinyl alcohol mixture. . The mixture was heated in a warm bath with 90 ° C. water with constant stirring at 300 rpm until the volume reached 250 mL.
６）ホルムアルデヒド及び硫酸の添加
５）で調製したナノセルロース／プルシアンブルー／デンプン／ポリビニルアルコール混合液を、冷水で２０℃まで冷ました後、４００ｒｐｍで常に撹拌しながら質量％が３６％のホルムアルデヒド２５ｍL及び質量％が９５％の硫酸２５ｍLを滴下して加えた。
6) Addition of formaldehyde and sulfuric acid After cooling the nanocellulose / Prussian blue / starch / polyvinyl alcohol mixture prepared in 5) to 20 ° C. with cold water, 25 mL of formaldehyde with a mass% of 36% and constantly stirring at 400 rpm 25 mL of sulfuric acid having a mass% of 95% was added dropwise.
７）ナノセルロース／プルシアンブルー／ポリビニルアルコール多孔質体の作製
６）で調製したホルムアルデヒド及び硫酸添加後のナノセルロース／プルシアンブルー／デンプン／ポリビニルアルコール混合液を、一晩の間５５℃の水で温め続けた。このようにして調製されたプルシアンブルー／ナノセルロース／デンプン／ポリビニルアルコールの固体を、脱イオン水で洗浄し、ナノセルロース／プルシアンブルー／ポリビニルアルコール多孔質体を作製した。
7) Preparation of nanocellulose / Prussian blue / polyvinyl alcohol porous body The nanocellulose / Prussian blue / starch / polyvinyl alcohol mixed solution after addition of formaldehyde and sulfuric acid prepared in 6) was warmed with 55 ° C. water overnight. Continued. The thus prepared Prussian blue / nanocellulose / starch / polyvinyl alcohol solid was washed with deionized water to produce a nanocellulose / Prussian blue / polyvinyl alcohol porous body.
８）プルシアンブルーの溶出確認実験
７）で作製したナノセルロース／プルシアンブルー／ポリビニルアルコール多孔質体を乾燥処理した後、乾燥したナノセルロース／プルシアンブルー／ポリビニルアルコール多孔質体０．８０ｇを、脱イオン水４０ｍＬに添加し、２０℃で、３００ｒｐｍで２４時間連続攪拌を実施した。そして、ナノセルロース／プルシアンブルー／ポリビニルアルコール多孔質体を取り出した後、残った溶液を紫外可視分光計（UV-Vis）で測定した。
8) Prussia blue elution confirmation experiment After drying the nanocellulose / Prussian blue / polyvinyl alcohol porous material prepared in 7), 0.80 g of the dried nanocellulose / Prussian blue / polyvinyl alcohol porous material was deionized. The mixture was added to 40 mL of water and continuously stirred at 20 ° C. and 300 rpm for 24 hours. Then, after the nanocellulose / Prussian blue / polyvinyl alcohol porous body was taken out, the remaining solution was measured with an ultraviolet-visible spectrometer (UV-Vis).
図４のとおり、プルシアン ブルー（PB）標準コロイド水溶液（PB、５０ｐｐｍ）の透過スペクトルでは、６８０ｎｍ付近にブロードなピークが現れている。このブロードなピークは、Fe−Fe間電荷移動吸収として知られており、プルシアンブルーを示すピークである。これに対し、実施例１では、６８０ｎｍ付近にブロードなピークが現れず、また、その透過スペクトルは脱イオン水のみの場合の透過スペクトルと同じであるため、プルシアンブルーが多孔質体から溶出していないことが確認された。 As shown in FIG. 4, in the transmission spectrum of the Prussian blue (PB) standard colloid aqueous solution (PB, 50 ppm), a broad peak appears around 680 nm. This broad peak is known as Fe-Fe charge transfer absorption and is a peak showing Prussian blue. On the other hand, in Example 1, a broad peak does not appear around 680 nm, and the transmission spectrum is the same as the transmission spectrum in the case of only deionized water, so Prussian blue is eluted from the porous material. Not confirmed.
本発明の捕集剤を用いることで、安全、安価、又は／及び容易に、汚染水等に含まれる標的とする化学物質（例えば、セシウム、ストロンチウム、ヨウ素等）を低減ないし除去できる。
また、本発明の捕集剤を担持させる親水性基材を加工が容易なものにすることで、除染の対象に応じて、最適な態様へ容易に加工することができ、最適な装置へ適用することができる。さらに、標的とする化学物質を吸着させた吸着剤（プルシアンブルー等）を環境に取り残すことなく、容易に回収することができるため、安全、安価、又は／及び容易に、標的とする化学物質を低減ないし除去することができる。
By using the collection agent of the present invention, target chemical substances (eg, cesium, strontium, iodine, etc.) contained in contaminated water can be reduced or removed safely, inexpensively, and / or easily.
In addition, by making the hydrophilic base material carrying the scavenger of the present invention easy to process, it can be easily processed into an optimal mode according to the object of decontamination, and an optimal apparatus is obtained. Can be applied. Furthermore, since the adsorbent (Prussian blue, etc.) adsorbing the target chemical substance can be easily recovered without leaving it in the environment, the target chemical substance can be safely, inexpensively and / or easily It can be reduced or eliminated.
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