Hasan M A, Selim Y T, Mohamed K M
Department of Analytical Chemistry, Hot Laboratories Center, Atomic Energy Authority, Egypt.
J Hazard Mater. 2009 Sep 15;168(2-3):1537-41. doi: 10.1016/j.jhazmat.2009.03.030. Epub 2009 Mar 18.
This paper presents a comprehensive study in recovery of Cr (VI) from dilute HCl solution using liquid emulsion membrane (LEM). The liquid membrane is made up of Tri-octylphosphine oxide (TOPO) as a carrier, cyclohexane as an organic diluent, sodium hydroxide as a stripping solution and Span-80 (sorbitain monooleate) as an emulsifying agent. The selection of the extractant (TOPO) and the stripper (NaOH) was chosen on the basis of conventional liquid-liquid extraction studies. The important parameters affecting the permeation of Cr (VI) through the prepared membrane are hydrogen ion concentration in the external aqueous phase, stirring speed of mixing the two phases, type of diluents, carrier concentration, stripper concentration, membrane to feed ratio and volume fraction were systematically investigated. The effect of surfactant types and concentration on the stability of LEM were studied because of its important role in the permeation process.
本文介绍了一项使用液膜（LEM）从稀盐酸溶液中回收六价铬（Cr(VI)）的综合研究。液膜由作为载体的三辛基氧化膦（TOPO）、作为有机稀释剂的环己烷、作为反萃溶液的氢氧化钠以及作为乳化剂的Span-80（脱水山梨醇单油酸酯）组成。萃取剂（TOPO）和反萃剂（NaOH）的选择是基于传统液 - 液萃取研究。系统地研究了影响Cr(VI)透过制备好的膜的重要参数，包括外部水相中的氢离子浓度（原文有误，应该是氢离子浓度，而不是氢原子浓度）、两相混合的搅拌速度、稀释剂类型、载体浓度、反萃剂浓度、膜与进料比以及体积分数。由于表面活性剂类型和浓度在渗透过程中具有重要作用，因此研究了它们对液膜稳定性的影响。
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