Since cadmium is one of the heavy metals which are harmful for human health, recovery and removal of cadmium from electronic wastes leaching solutions and waste water is mandatory. In this project, emulsion liquid membrane (ELM) technique was developed for the extraction of cadmium present in aqueous samples. TOPO (tri octyl phosphine oxide) was used as a neutral extractant to extract and concentrate of cadmium at the same time. Hence in order to enhance the extraction % of cadmium, optimum conditions has to be determined when applying emulsion liquid membrane technique. Carrier, surfactant and internal phase concentrations as well as external/emulsion ratio, stirring time, external phase pH, etc. are considered as the influencing parameters of the ELM. Optimization of these parameters is achieved by employing Taguchi method for five levels variations of the above parameters using an L25 orthogonal array. Higher the better concept has been used to get a higher extraction %. According to the analysis of variance (ANOVA) results, the most effective parameter of the process is carrier concentration with contribution % of 94.85. The results show that TOPO |
