汞(Ⅱ)在罗丹明B-乙醇-硫酸铵体系中的析相萃取分离

研究了罗丹明B-乙醇-硫酸铵体系析相萃取Hg²⁺的行为及与一些金属离子分离的条件。结果表明,乙醇的水溶液在硫酸铵的作用下分成醇/水两相,在分相过程中,HgCl₄^2-与罗丹明B(RhB)生成的HgCl₄^2-]RhB⁺]₂能被乙醇相萃取。当溶液中罗丹明B、乙醇和硫酸铵的浓度分别为0.21 mg/mL、30%(V/V)和0.30 g/mL时,HgCl₄^2-的萃取率达到96.8%以上,Co²⁺、Cr(Ⅲ)、Ag⁺、Mg²⁺、Ni ²⁺、Al³⁺、Ti(Ⅳ)、Pb²⁺、Fe³⁺、Sn(Ⅳ)和Ru³⁺基本不被萃取,实现了Hg²⁺与上述金属离子的分离。

Phase extraction and separation of mercury(Ⅱ) in rhodamine B-ethanol-ammonium sulfate system

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 HgCl₄^2-]RhB⁺]₂ formed by HgCl₄^2－ 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 HgCl₄^2- 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.