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研究了以聚偏氟乙烯膜为支撑体,二-(2-乙基己基)磷酸(D2EHPA)为流动载体,煤油和D2EHPA的混合溶液作为膜溶液,膜溶液和解析剂HCl溶液组成更新相的更新型支撑液膜(RSLM)中Gd(Ⅲ)的分离行为;考察了料液pH、更新相HCl浓度、膜溶液与HCl溶液体积比、不同载体浓度对Gd(Ⅲ)分离的影响,得出了Gd(Ⅲ)最优分离条件为:更新相HCl溶液浓度4.00 mol/L,膜溶液与HCl溶液体积比4∶3,载体浓度控制在0.160 mol/L,料液相中pH为4.80.在最优分离条件下,当Gd(Ⅲ)的初始浓度为1.00×10-4 mol/L时,35 min Gd(Ⅲ)分离率达到95.7%.最后根据传质定律和界面化学理论提出了Gd(Ⅲ)在RSLM中的传质动力学方程.
In this paper, the mixed solution of kerosene and D2EHPA was used as the membrane solution with polyvinylidene fluoride (PVDF) membrane as the support and D2EHPA as the mobile carrier. The membrane solution and the resolver HCl solution were composed of a new phase The separation behavior of Gd (Ⅲ) in RSLM was investigated. The effect of feed pH, phase-updated HCl concentration, volume ratio of membrane solution to HCl solution and different carrier concentrations on Gd (Ⅲ) separation were investigated. The optimal separation conditions of Gd (Ⅲ) were as follows: the concentration of renewal phase HCl solution was 4.00 mol / L, the volume ratio of membrane solution to HCl solution was 4: 3, the concentration of carrier was 0.160 mol / L and the pH of feed phase was 4.80. When the initial concentration of Gd (Ⅲ) was 1.00 × 10-4 mol / L, the separation rate of Gd (Ⅲ) reached 95.7% at 35 min after the optimal separation conditions.Finally, according to the mass transfer law and interfacial chemistry theory, the Gd (Ⅲ) Ⅲ) Mass transfer kinetics in RSLM.