Green phase extraction separation of indium by ethanol-ammonium thiocyanate-ammonium sulfate system
CAO Shu-qin1, SI Xue-zhi2 , MA Wan-shan*1
1.College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China; 2.College of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450052, China
Abstract：The extraction of ethanol-ammonium thiocyanate-ammonium sulfate on indium and the separation conditions of some metal elements were discussed. It showed that ammonium sulfate could separate ethyl alcohol into two phases. During phase separation, the In(SCN)4- formed by In3+ and ammonium thiocyanate reacted with protonated C2H5OH2+ and generated complex [In(SCN)4-][C2H5OH2+] which could be completely extracted with ethanol phase. When the concentration of ethanol, ammonium thiocyanate and ammonium sulfate were 30 % (V/V), 7.0×10-3 mol/L and 0.3 g/mL, the extraction efficiency of In3+ was up to 98.1 %.Ce3+, Fe2+, Cd2+, Pb2+, Ni2+, Mg2+, Cr3+, Ag+, V and Cu2+ were basically not extracted, thus realizing the separation of In3+ from the above metal ions. The proposed method had a fine effect on the extraction and determination of indium in water samples.
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