罗丹明B-乙醇体系析相绿色萃取分离金

研究了罗丹明B-乙醇体系析相萃取金的行为及金与一些金属离子分离的条件。结果表明,乙醇水溶液在硫酸铵的作用下可分为水-乙醇两相,在此过程中,乙醇相能完全萃取罗丹明B(RhB)和AuCl₄^-生成的缔合物AuCl₄^-]RhB⁺]。当溶液中罗丹明B、硫酸铵的质量浓度分别为0.2 mg/mL、0.3 g/mL,乙醇的体积分数为30%(V/V)时, AuCl₄^-的萃取率达到98.3%以上,而试液中Ni²⁺、Sn⁴⁺、Mg²⁺、Fe³⁺、Cr³⁺、Al³⁺、Ru³⁺、Pb²⁺、Ti⁴⁺、Co²⁺和Ag⁺基本不被萃取,实现了Au³⁺与上述金属离子的分离。

Separation of gold in Rhodamine B-ethanol system by green extraction phase

The extraction behaviors of Rodamin B-ethyl alcohol system on gold and the conditions for separation of gold from other metal ions were studied. It was found that ethyl alcohol-water solution could be separated into two phases of ethyl alcohol and water with the effect of ammonium sulfate. During the phase separation process, the complex AuCl₄^-]RhB⁺] formed with AuCl₄^- and Rodamin B (RhB) could be completely extracted by ethyl alcohol. In the solution containing 0.2 mg/mL Rodamin B, 0.3 g/mL ammonium sulfate and 30% (V/V) ethyl alcohol, the extraction rate of AuCl₄^- could reach above 98.3 %, while Ni²⁺, Sn⁴⁺, Mg²⁺, Fe³⁺, Cr³⁺, Al³⁺, Ru³⁺, Pb²⁺, Ti⁴⁺, Co²⁺ and Ag⁺ was basically not extracted. Thus, Au³⁺ was separated from the above metal ions.