分散支撑液膜体系中Pt(Ⅳ)的传输研究

Study on Transportation of Pt(Ⅳ) in Dispersion Supported Liquid Membrane System

摘要:

以聚偏氟乙烯膜(PVDF)为支撑体，煤油为膜溶剂，2-乙基己基膦酸-单-2-乙基己基酯（PC-88A）为流动载体，研究分散支撑液膜体系中金属Pt(Ⅳ)的传输行为；考察分散相中膜溶液与解析液体积比、分散相中HCl浓度以及料液相酸度对Pt(Ⅳ)传输的影响。结果表明，当分散相中膜溶液与解析液体积比为140:60；用HCl作为解析剂，解析液HCl浓度为7.0 mol/L；料液相盐酸浓度为0.5 mol/L时，该分散支撑液膜体系对金属Pt(Ⅳ)具有良好的传输作用。在最佳传输条件下，Pt(Ⅳ)起始浓度为1.0×10-

Abstract:

Using polyvinylidene fluoride membrane (PVDF) as a supported, kerosene as a membrane solvent, 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC-88A) as a flowing carrier, the transportation of Pt(IV) in a dispersion supported liquid membrane (DSLM) was investigated. The effects of the volume ratio of the membrane liquid to stripping phase, the concentrations of HCl in the stripping phase, and the acid concentrations in the feed liquid on the transportation of Pt(IV) were studied. The results show that DSLM play an effective role in the transportation of Pt(IV), when the volume ratio of the membrane liquid to the stripping liquid in the dispersion liquid is 140:60, HCl is used as a stripping liquid and its concentrations is 7.0 mol/L, the concentrations of HCl in the feed phase is 0.5 mol/L. Under the optimum condition and upon Pt(IV) initial concentration with 1.0×10-5 mol/L, Pt(IV) can be completely transported within 130 min, but the transportation rate is only 83.6% through traditional SLM.