Björkegren Sanna, Karimi Rose Fassihi, Martinelli Anna, Jayakumar Natesan Subramanian, Hashim Mohd Ali
Applied Surface Chemistry, Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.
Department of Chemical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia.
Membranes (Basel). 2015 Apr 23;5(2):168-79. doi: 10.3390/membranes5020168.
The extraction efficiency of hexavalent chromium, Cr(VI), from water has been investigated using a vegetable oil based emulsion liquid membrane (ELM) technique. The main purpose of this study was to create a novel ELM formulation by choosing a more environmentally friendly and non-toxic diluent such as palm oil. The membrane phase so formulated includes the mobile carrier tri-n-octylmethylammonium chloride (TOMAC), to facilitate the metal transport, and the hydrophilic surfactant Tween 80 to facilitate the dispersion of the ELM phase in the aqueous solution. Span 80 is used as surfactant and butanol as co-surfactant. Our results demonstrate that this novel ELM formulation, using the vegetable palm oil as diluent, is useful for the removal of hexavalent chromium with an efficiency of over 99% and is thus competitive with the already existing, yet less environmentally friendly, ELM formulations. This result was achieved with an optimal concentration of 0.1 M NaOH as stripping agent and an external phase pH of 0.5. Different water qualities have also been investigated showing that the type of water (deionized, distilled, or tap water) does not significantly influence the extraction rate.
利用基于植物油的乳液液膜（ELM）技术，对水中六价铬（Cr(VI)）的萃取效率进行了研究。本研究的主要目的是通过选择更环保、无毒的稀释剂（如棕榈油）来创建一种新型的ELM配方。如此配制的膜相包括促进金属传输的流动载体三正辛基甲基氯化铵（TOMAC），以及促进ELM相在水溶液中分散的亲水性表面活性剂吐温80。司盘80用作表面活性剂，丁醇用作助表面活性剂。我们的结果表明，这种以棕榈油为稀释剂的新型ELM配方可有效去除六价铬，去除效率超过99%，因此与现有的、但对环境不太友好的ELM配方相比具有竞争力。该结果是在使用0.1 M NaOH作为反萃剂且外相pH值为0.5的最佳浓度下实现的。还研究了不同水质，结果表明水的类型（去离子水、蒸馏水或自来水）对萃取率没有显著影响。
