activated into rhodium (I) by SnCl2 to improve extraction percentage, which was confirmed by XPS spectra. Under optimum conditions, the extraction percentage reached 99.6%. The neutral complexing mechanism was confirmed by UV-vis spectra, 1H NMR spectra, titration method and FT-IR spectra. The quantum chemical calculations based on density functional theory (DFT) were also performed to support the results
低粘度萃取剂1-己基-3-甲基
咪唑-2-
硫酮(HMImT)首先被合成并用于萃取
铑(I)。通过HPLC测量HMImT在溶液中的微不足道的溶解度,约为0.015%。在萃取过程中,溶液中的
铑(III)被SnCl2活化成
铑(I),以提高萃取率,这一点已通过XPS光谱证实。在最佳条件下,提取率达到99.6%。通过紫外可见光谱,1 H NMR光谱,滴定法和FT-IR光谱确认了中性络合机理。还进行了基于密度泛函理论(DFT)的量子
化学计算,以支持理论见解的结果。提取过程分别由Langmuir(R2 = 0.998),Freundlich(R2 = 0.972)和Dubinin-Radushkevich等温线(R2 = 0.990)建模。根据模型结果,单层吸收容量为2.82 mmol / g,平均自由能为9.8 kJ / mol。△G,△H和△S的热力学参数表明萃取过程是自发的且放热的。伪二阶动力学很好地拟合了实验数据(R2