Removal of mercury(II) from wastewater by anion-exchange resin and chelate resin.
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Abstract:
陰イオン交換樹脂およびキレート樹脂を用い,種々の配位子が存在する廃液中の水銀の除去条件を検討した。キレート化剤(EDTA,ペプトン)の存在は樹脂による水銀の除去を妨害したが,Br-あるいはI-の存在は陰イオン交換樹脂による水銀の除去効果を増大させた。陰イオン交換樹脂2gを充墳したカラムを用いて水銀(II)(1mg/l)溶液を処理した結果,KI(0.17%,pH2.5)のみを添加した系においては,90lを処理した後でも水銀濃度0.5μg/l以下の処理水が得られた。EDTA(1mmol/l,pH6)あるいはペプトン(5g/l,pH2.5)が存在すると水銀の除去はほとんどなされなかったが,これにKIを0.017あるいは0.17%添加することによりKIのみを添加した場合と同程度の結果が得られた。水銀吸着用キレート樹脂を用いた場合も同様に,KIの添加によって水銀の除去効果は大きく向上したが,処理液量は陰イオン交換樹脂より少なかった。これらの結果から,キレート化剤を含有する水銀廃液の処理にさいしては共吸着剤としてKIを添加することが効果的であり,吸着剤としては陰イオン交換樹脂が優れていると結論した.Keywords:
Ion-exchange resin
Mercury
Chelating resin
A new L-phenylalanine resin (PSAcylPhe) was prepared by chloroacetylated polystyrene (PSAcylCl) instead of merrifield resin (PSCH2Cl) and applied for chelating Ni2+. The effects of pH, chelating time and concentration of Ni2+ on the chelating reaction were investigated for the optimal chelating condition. The results show that under the optimal conditions of Ni2+ concentration 0.1 mol/L, pH 3.5～9.0, and chelating time 1 h, the chelating rate could be up to 40.8%.
Chelating resin
Polystyrene
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3,6-dihydrothiazolo [5, 4-d] thiazole which supported on polyurethane was synthesized. The prepared compound was characterized by FTIR and 1 H NMR spectroscopy. The chelating properties towards various metal ions Pb 2+ , Mn 2+ , Cr 3+ , Co 3+ and Cd +3 was examined. The effects of concentration of metal ions, time of extraction and pH as well as the recovery of ions have been studied. The results showed that the high activity order of resin to extract the metal ions is Pb 2 > Cd +3 > Mn 2+ >Cr 3+ > Co 3+ . Keywords: thiazole, polyurethane, chelating resin, chelating efficiency, coordination polymers
Chelating resin
Thiazole
Ion-exchange resin
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Resin-in-pulp(RIP) method is one of the hot research topics in extraction and separation of precious metals from solutions,and the preparation of chelating resins with high adsorption capacity and high selectivity is the key to this technique.The classification of chelating resins,the relationship between structure and property of chelating resin,and the chelating mechanism of chelating resin and precious metal ions were discussed,the synthesis and adsorption property of chelating resins in recent 10 years was reviewed,and the trend of chelating resins was forecasted.
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Precious metal
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Ion-exchange resin has capacity of exchange,selection,adsorption and catalysis in the industrial wastewater treatment.It was mainly used for the recovery of heavy metals or rare metals,purification of toxic substances and the removal of acidic or alkaline organic material.The research progresses of ion-exchange resin(anion exchange resin,cation exchange resin,amphoteric ion exchange resin,chelate resin and redox resin) in industrial wastewater treatment were reviewed.It was also pointed out that because of its advantages of deep purification,high efficiency and comprehensive recovery of the various metals,the method of ion-exchange resin was one of the most widely used technology for industrial treatment in China,which would get more in-depth application in the field of water treatment.
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Ion-exchange resin
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ボスホン酸ジフェニルーホルムアルデヒド縮合樹脂にイミノ二酢酸を導入したキレート樹脂の合成を試み,その金属イオン吸着性および六価クロム吸着性について検討した。イミノ二酢酸の導入反応は80℃,2時間加熱することにより容易に行なわれ,イオン交換容量は1.9meq/g-R(乾燥樹脂)で,吸着速度および通液性にすぐれた樹脂が得られた。Cu2+イオンに対して低pH域で選択吸着性を示し,ほかの二価金属イオンからの分離が可能であった。また,同属金属イオンであるCo2+とNi2+イオンとの相互分離が1.0mol・dm-3酢酸でできることが見いだされた。本樹脂は耐酸化性に富み,硫酸溶液中のCr2O72-イオンの良好な吸着性を示した。硫酸濃度を低くすると高濃度のCr2O72-イオンの吸着処理が可能であり,また,吸着したイオンは0.3v/v%H2O2-0.1mol・dm-3NaOH溶液で100%回収できた。
Iminodiacetic acid
Ion-exchange resin
Chelating resin
Phosphonate
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