Phase extraction and separation of mercury(Ⅱ) in rhodamine B-ethanol-ammonium sulfate system
NIU Ming-gai1, SI Xue-zhi2, MA Dong-dong1, 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 phase extraction and separation behaviors of Hg2+ in rhodamine B-ethanol-ammonium sulfate system as well as the separation conditions from some metal ions were discussed. The results showed that the aqueous solution of ethanol could be extracted and separated to ethanol/water phases in presence of ammonium sulfate. During the phase separation process, the [HgCl42-][RhB+]2 formed by HgCl42－ and rhodamine B (RhB) could be extracted by the ethanol phase. When the concentration of rhodamine B, ethanol and ammonium sulfate in solution was 0.21 mg/mL, 30 % (V/V) and 0.30 g/mL, respectively, the extraction rate of HgCl42- was higher than 96.8%. Meanwhile, other metal ions such as Co2+, Cr(Ⅲ), Ag+, Mg2+, Ni2+, Al3+, Ti (Ⅳ), Pb2+, Fe3+, Sn(Ⅳ) and Ru3+ were not extracted, realizing the separation of Hg2+ from the metal ions above.
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