Extraction of Ni(II) from spent Cr–Ni electroplating bath solutions using LIX 63 and 2BDA as carriers by emulsion liquid membrane technique

In the present study, the synergistic extraction of Ni(II) from spent Cr–Ni electroplating bath solutions (SEBS) was determined using 5,8-diethyl-7-hydroxydodecan-6-one oxime(LIX 63) and 2-bromodecanoic acid(2BDA) by emulsion liquid membranes(ELM)s. The effect of membrane and aqueous phase properties on Ni(II) transport was experimentally investigated. Ni(II) extraction was obtained to be higher than 98.5% in the optimum conditions within 6 min. The higher separation factor (βNi/Cr) was obtained as 677. In addition, Ni(II) extraction kinetics depends on LIX63 because the extraction kinetics of LIX63 is slower than 2BDA. Therefore, we have determined that 2BDA acts as a synergist in present extraction system.