Abstract
Abstract Pertraction of copper(II) ions in aqueous solutions by means of emulsion liquid membrane (ELM) was studied with applying design of experiments, central composition design. The liquid membrane phase consisted of M2EHPA/D2EHPA, n-Hexane and Span 80 as carrier, organic diluent, and non-ionic surfactant, respectively. The internal phase was sulfuric acid ( H 2 SO4) aqueous solution. The response surfaces of Cu(II) via the contours and 3D maps for pertraction efficiency were evaluated. According to the results, the model was matched to the experimental data with high coefficients of determination value which indicated the accuracy of polynomial response model for predicting the pertraction efficiency. The R pred 2 of 0.9052 is in reasonable agreement with the R adj 2 of 0.9188. Furthermore, under the optimum conditions, the observed Cu(II) ions pertraction efficiency of 99.95% can be achieved by RSM at 225, 4 and 1 mg/L of feed, carrier and surfactant concentration, respectively and stirring speed of 150rpm, feed to emulsion ratio of 6 vol/vol. % and pertraction time of 6 min. ELM was found to be a good method for pertraction as it was able to separate the heavy metal relatively fast.
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