Experimental results and optimization via the design of experiment (DOE) of the copper ion recovery from aqueous solutions using emulsion liquid membrane (ELM) method

Abstract

Copper ion recovery from aqueous solutions is of particular importance due to the need for an environment free of industrial pollution. The emulsion liquid membrane (ELM) has a high potential to recover and remove metal ions. In this research, first, using a liquid–liquid extraction method, the parameters affecting the extraction of copper ion were investigated. Then, by identifying the influential parameters on the test process, using the ELM method, the parameters affecting the copper ion separation were examined using a bi-functional polyethylene glycol carrier. In addition, the design of the experiment with Design Expert 10 software was used to investigate and com-pare with laboratory results. For this purpose, the central composite design method was used to study the factors affecting the copper ion separation. In conclusion, by optimizing the operational conditions, about 99% extraction efficiency for copper ion was achieved.