JP6034403B2 - シクロデキストリン担持ポリマーからなる有機フッ素系化合物吸着剤 - Google Patents
シクロデキストリン担持ポリマーからなる有機フッ素系化合物吸着剤 Download PDFInfo
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- JP6034403B2 JP6034403B2 JP2014551027A JP2014551027A JP6034403B2 JP 6034403 B2 JP6034403 B2 JP 6034403B2 JP 2014551027 A JP2014551027 A JP 2014551027A JP 2014551027 A JP2014551027 A JP 2014551027A JP 6034403 B2 JP6034403 B2 JP 6034403B2
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- cyclodextrin
- organic fluorine
- polystyrene particles
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- 239000003463 adsorbent Substances 0.000 title claims description 21
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 title claims description 3
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- 229920001353 Dextrin Polymers 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 125000005011 alkyl ether group Chemical group 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 125000003917 carbamoyl group Chemical group [H]N([H])C(*)=O 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- 125000002147 dimethylamino group Chemical group [H]C([H])([H])N(*)C([H])([H])[H] 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000921 elemental analysis Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 125000003709 fluoroalkyl group Chemical group 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical group FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 235000001727 glucose Nutrition 0.000 description 1
- 150000002304 glucoses Chemical class 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- AKRQHOWXVSDJEF-UHFFFAOYSA-N heptane-1-sulfonic acid Chemical compound CCCCCCCS(O)(=O)=O AKRQHOWXVSDJEF-UHFFFAOYSA-N 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000002198 insoluble material Substances 0.000 description 1
- 238000001294 liquid chromatography-tandem mass spectrometry Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- QLOAVXSYZAJECW-UHFFFAOYSA-N methane;molecular fluorine Chemical group C.FF QLOAVXSYZAJECW-UHFFFAOYSA-N 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 238000010534 nucleophilic substitution reaction Methods 0.000 description 1
- 229920001542 oligosaccharide Polymers 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- JGTNAGYHADQMCM-UHFFFAOYSA-N perfluorobutanesulfonic acid Chemical compound OS(=O)(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F JGTNAGYHADQMCM-UHFFFAOYSA-N 0.000 description 1
- 125000005003 perfluorobutyl group Chemical group FC(F)(F)C(F)(F)C(F)(F)C(F)(F)* 0.000 description 1
- YPJUNDFVDDCYIH-UHFFFAOYSA-N perfluorobutyric acid Chemical compound OC(=O)C(F)(F)C(F)(F)C(F)(F)F YPJUNDFVDDCYIH-UHFFFAOYSA-N 0.000 description 1
- CXGONMQFMIYUJR-UHFFFAOYSA-N perfluorododecanoic acid Chemical compound OC(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F CXGONMQFMIYUJR-UHFFFAOYSA-N 0.000 description 1
- QZHDEAJFRJCDMF-UHFFFAOYSA-N perfluorohexanesulfonic acid Chemical compound OS(=O)(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F QZHDEAJFRJCDMF-UHFFFAOYSA-N 0.000 description 1
- SIDINRCMMRKXGQ-UHFFFAOYSA-N perfluoroundecanoic acid Chemical compound OC(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F SIDINRCMMRKXGQ-UHFFFAOYSA-N 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- ODZPKZBBUMBTMG-UHFFFAOYSA-N sodium amide Chemical compound [NH2-].[Na+] ODZPKZBBUMBTMG-UHFFFAOYSA-N 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- JRMUNVKIHCOMHV-UHFFFAOYSA-M tetrabutylammonium bromide Chemical compound [Br-].CCCC[N+](CCCC)(CCCC)CCCC JRMUNVKIHCOMHV-UHFFFAOYSA-M 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 239000013638 trimer Substances 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea group Chemical group NC(=O)N XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 239000003021 water soluble solvent Substances 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
- B01J20/3475—Regenerating or reactivating using a particular desorbing compound or mixture in the liquid phase
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
- B01J20/265—Synthetic macromolecular compounds modified or post-treated polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
- B01D15/08—Selective adsorption, e.g. chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
- B01D15/08—Selective adsorption, e.g. chromatography
- B01D15/26—Selective adsorption, e.g. chromatography characterised by the separation mechanism
- B01D15/265—Adsorption chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
- B01J20/261—Synthetic macromolecular compounds obtained by reactions only involving carbon to carbon unsaturated bonds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28016—Particle form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
- B01J20/3206—Organic carriers, supports or substrates
- B01J20/3208—Polymeric carriers, supports or substrates
- B01J20/321—Polymeric carriers, supports or substrates consisting of a polymer obtained by reactions involving only carbon to carbon unsaturated bonds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3214—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the method for obtaining this coating or impregnating
- B01J20/3217—Resulting in a chemical bond between the coating or impregnating layer and the carrier, support or substrate, e.g. a covalent bond
- B01J20/3219—Resulting in a chemical bond between the coating or impregnating layer and the carrier, support or substrate, e.g. a covalent bond involving a particular spacer or linking group, e.g. for attaching an active group
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
- B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
- B01J20/3268—Macromolecular compounds
- B01J20/3272—Polymers obtained by reactions otherwise than involving only carbon to carbon unsaturated bonds
- B01J20/3274—Proteins, nucleic acids, polysaccharides, antibodies or antigens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3425—Regenerating or reactivating of sorbents or filter aids comprising organic materials
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/50—Use of additives, e.g. for stabilisation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
- C08B37/0009—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid alpha-D-Glucans, e.g. polydextrose, alternan, glycogen; (alpha-1,4)(alpha-1,6)-D-Glucans; (alpha-1,3)(alpha-1,4)-D-Glucans, e.g. isolichenan or nigeran; (alpha-1,4)-D-Glucans; (alpha-1,3)-D-Glucans, e.g. pseudonigeran; Derivatives thereof
- C08B37/0012—Cyclodextrin [CD], e.g. cycle with 6 units (alpha), with 7 units (beta) and with 8 units (gamma), large-ring cyclodextrin or cycloamylose with 9 units or more; Derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
- C08B37/0009—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid alpha-D-Glucans, e.g. polydextrose, alternan, glycogen; (alpha-1,4)(alpha-1,6)-D-Glucans; (alpha-1,3)(alpha-1,4)-D-Glucans, e.g. isolichenan or nigeran; (alpha-1,4)-D-Glucans; (alpha-1,3)-D-Glucans, e.g. pseudonigeran; Derivatives thereof
- C08B37/0012—Cyclodextrin [CD], e.g. cycle with 6 units (alpha), with 7 units (beta) and with 8 units (gamma), large-ring cyclodextrin or cycloamylose with 9 units or more; Derivatives thereof
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- C02F2101/30—Organic compounds
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- C02F2303/16—Regeneration of sorbents, filters
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- Oil, Petroleum & Natural Gas (AREA)
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Description
本発明のシクロデキストリン担持ポリマー材料は、有機フッ素系界面活性剤等の有機フッ素系化合物を選択的に効率よく吸着することができる。
また、本発明のシクロデキストリン担持ポリマー材料からは、吸着した有機フッ素系化合物を回収でき、回収後のシクロデキストリン担持ポリマー材料は再利用することができる。
有機フッ素化合物を含有する水溶液に、シクロデキストリン担持ポリマーを添加する工程、
有機フッ素化合物とシクロデキストリン担持ポリマーを接触させる工程、
を経ることにより行う。
窒素雰囲気下で、6位トシル化−β−CD(東京化成工業(株)製)(0.10g、0.078mmoL)に脱イオン水(10mL)に溶解させたアジ化ナトリウム(0.10g、1.6mmoL)を加えた後、100℃で一晩反応させた。室温まで冷却し、濾過により沈殿を除去して得られた廬液から減圧下で水を90%以上留去した。1,1,2,2−テトラクロロエタン(5mL)を加えて抽出し、得られた有機層を濃縮して白色固体を得た。白色固体を水から再結晶した(収量0.037g、収率41%)。得られた6−アジド−β−CD(0.029g、0.025mmol)とトリフェニルホスフィン(7.5mg、0.0275mmoL)をジメチルホルムアミド(1mL)に溶解させ室温で2時間撹拌後、0.1mLの脱イオン水を加えて90℃で3時間撹拌した。室温まで冷却後、アセトン10mL中に添加して生じた沈殿をろ取した。アセトンで洗浄後、真空乾燥させて6−アミノ−β−CDを得た(収量0.028g、収率98%)。
一方、6位トシル化−β−CD(10g, 7.8 mmol) に28%アンモニア水50 mLを加えて50 ℃で12時間反応させた後、室温まで冷却し、反応混合物をアセトン500 mLに注いで生じた沈殿をろ取、乾燥させることによっても6−アミノ−β−CDを合成することができた(8.8 g、収率100%)。
FT−IRスペクトルには、第一級アミノ基のN−H変角振動に基づく吸収が1661cm−1に観測されたことより、6−アミノ−β−CDの生成を確認した。
クロロメチル化ポリスチレン粒子(粒径35−74μm、3.5−4.5 mmol/Cl/1g)(Merrifield’s peptide resin(Sigma Aldrich社製)を使用した。
上記クロロメチル化ポリスチレン粒子(PS−CH2Cl粒子)0.5g(2mmol Cl)を、上記で得られた6アミノ−β−CD2.5g(2.2mmol)を含有するジメチルスルホキシド(DMSO)溶液に投入し、60℃、12時間撹拌した。
{50−残存有機フッ素化合物濃度(ppb)}×10-8
により求めた。
吸着率は、
{50−残存有機フッ素化合物濃度(ppb)}/50 × 100
により求めた。
図3からは、Clに対するβ−CDの修飾率が36%の粒子「PS−N−β−CD(36%)」は0.1重量%および1重量%のいずれの添加率の時でもこれらの有機フッ素化合物に対しほぼ100%の吸着率を示した。一方、β−CDの修飾率が6%の粒子「PS−N−β−CD(6%)」の場合は、添加率の減少により吸着率が大きく減少した。これより、ポリスチレン表面上のβ−CDが有機フッ素化合物吸着に関与していることがわかる。また、PS−Clが、PFOSを吸着しているのは、PFOSが疎水性の表面をもつ担体に吸着しやすく、疎水性相互作用によりPS−Clの疎水性表面と結合しているからである。
図4からは、β−CD担持ポリスチレン粒子のPFHxAに対する吸着能は水溶液のpHの影響を受け、中性・アルカリ性水溶液よりも酸性水溶液中で大きくなることがわかる。β−CD空孔内へのPFHxAのフッ化炭素鎖の包接に加え、β−CDの6位アミノ基(アンモニオ基)とPFHxAのカルボキシル基間の静電相互作用により酸性水溶液中でその吸着能が向上したと考えられる。
図5からは、β−CD担持ポリスチレン粒子のPFOAに対する吸着能も水溶液のpHの影響を受け、中性・アルカリ性水溶液よりも酸性水溶液中で大きくなることがわかる。PFHxAの場合と同様に、β−CD空孔内へのPFOAのフッ化炭素鎖の包接に加え、β−CDの6位アミノ基(アンモニオ基)とPFOAのカルボキシル基間の静電相互作用により酸性水溶液中でその吸着能が向上したと考えられる。
(上澄み液中に溶出したPFHxAの濃度)(mg/mL)x 1mL
により求めた。
窒素雰囲気下で、6位トシル化−β−CD(東京化成工業(株)製)(1.0g、0.78 mmol)にジメチルホルムアミド(3 mL)とエチレンジアミン(2.5 mL、37.4mmol)を加えた後、65℃で3時間反応させた。室温まで冷却後、アセトン100mL中に添加して生じた沈殿をろ取した。アセトンで洗浄後、真空乾燥させて6−モノ-(N−アミノエチル)アミノ−β−CDを得た(収量0.80g、収率87%)。
FT−IRスペクトルには、第一級アミノ基のN−H変角振動に基づく吸収が1673cm−1に観測されたことより、6−モノ-(N−アミノエチル)アミノ−β−CDの生成を確認した。
特許文献1第0045〜0046段に記載されている「4,4’-メチレンビス(フェニレンイソシアネート)と2,6-ジ-O-メチル-β-シクロデキストリンとの反応によるシクロデキストリンポリマー」を合成した。
すなわち、窒素雰囲気下で脱水DMF 10 mL 中に4,4’-メチレンビス(フェニレンイソシアネート) (564 mg, 2.25 mmol) と2,6-ジ-O-メチル-β-シクロデキストリン (1.00 g, 7.51 × 10-1 mmol) を溶解させ、70 ℃で12時間撹拌した。反応液を250 mL の脱イオン水に滴下し、生じた沈殿物を吸引ろ過により回収し、脱イオン水で洗浄後、減圧乾燥させてシクロデキストリンポリマー(白黄色固体、1.23 g)を得た。得られたポリマーのIRスペクトルには、カルバモイル基(NH-C(=O)-)のカルボニル(C=O)伸縮振動に基づく吸収ピークが観測された。また、25℃でのポリマーの水溶性は1wt%以下であった。
結果を下記表2に示す。
ハイポーラスクロロメチル化ポリスチレン粒子(粒径50〜300μm、細孔半径260Å、細孔容積0.60ml/g、比表面積41m2/g、5.6 mmol/Cl/1g)(三菱化学社製)を使用した。
Claims (8)
- 水不溶性ポリマー表面にシクロデキストリンを担持させてなるポリマーを含有する有機フッ素系化合物吸着剤であって、
水不溶性ポリマーがポリスチレン粒子からなり、
ポリスチレン粒子とシクロデキストリンが、2価の結合基−X−(Xは、NH、O、SまたはHN(CH 2 ) n NH(nは1〜6)、O(CH 2 ) n O(nは1〜6)またはO(CH 2 CH 2 O) n (nは2〜6)を表し、“−”は単結合を表す)を介して結合している、上記有機フッ素系化合物吸着剤。 - XがNHである請求項1に記載の吸着剤。
- 少なくとも1つの水酸基がアミノ基で置換されたシクロデキストリンと、クロロメチル基を有するポリスチレン粒子を反応させることで合成される請求項2に記載の吸着剤。
- シクロデキストリンが、β−シクロデキストリンである請求項1から3いずれかに記載の吸着剤。
- 請求項1から4いずれかに記載の吸着剤を用いて、有機フッ素系化合物を含む水溶液から、有機フッ素系化合物を吸着する行程を含むことを特徴とする、有機フッ素系化合物の除去方法。
- 有機フッ素系化合物の回収方法であって、
請求項1〜4いずれかに記載の吸着剤を使用して、有機フッ素系化合物を含有する水溶液から有機フッ素系化合物を吸着する工程、および
有機フッ素系化合物を吸着した吸着剤を極性溶媒で洗浄する工程
を含むことを特徴とする上記回収方法。 - 有機フッ素系化合物が、パーフルオロアルカンカルボン酸である請求項5に記載の除去方法。
- 有機フッ素系化合物が、パーフルオロアルカンカルボン酸である請求項6に記載の回収方法。
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