离子液体Cyphos IL 104的溶剂浸渍树脂的制备及其在铬(Ⅵ)回收中的应用

摘要

Ionic liquid(IL)trihexyl(tetradecyl)phosphonium bis 2,4,4-trimethylpentylphosphinate(Cyphos IL 104)was impregnated on XAD-7 resin.The solvent impreganated resin(SIR)was prepared and applied in Cr(VI)removal.The morphology and the thermal stability of the resins were explored.The effects of equilibrium time and initial pH value on Cr(VI)adsorption were investigated.Adsorption isotherm,separation and desorption of the SIR,and selectivity of SIR were also explored.The results show that Cyphos IL 104 exists in the inner XAD-7 resin,and the optimum pH value range of the SIR for Cr(VⅥ)extraction is 0 to 2.When NaOH used as desorption solution,the Cr(Ⅵ)can be effectively desorbed from the SIR.%采用XAD-7树脂浸渍离子液体二(2,4,4三甲基戊基)亚膦酸三己基十四烷基烷基鏻(Cyphos IL 104).研究该种溶剂浸渍树脂(SIR)的制备过程及其在Cr(Ⅵ)分离中的应用,并对树脂的表面形貌和热稳定性进行表征.研究平衡时间和初始pH值对Cr(Ⅵ)吸附的影响,讨论溶剂浸渍树脂的吸附等温线、吸附和解吸附过程以及浸渍树脂的选择性.结果表明,萃取剂Cyphos IL 104浸入了树脂的内部孔道中,溶剂浸渍树脂吸附Cr(Ⅵ)的最佳pH范围为0-2.当CyphosIL 104作为解吸附溶液时,Cr(Ⅵ)可以从树脂上有效地脱附.