Abstract

Sorption of rhodium(III) was investigated on complexing ion exchange resins Purolite S914 with thiouronium, Purolite S920 with isothiouronium, Purolite S924 with thiol functional groups, and Purolite S924/K containing both thiol and carboxyl groups (hereinafter S914, S920, S924, and S924/K, respectively) from 4 M solutions of hydrochloric acid which were previously kept either at room temperature or at a temperature of ~80°C in the presence of (g L^–1): Fe(III) 6.0, Al(III) 4.2, Zn(II) 5.2, Sn(IV) 4.1, and Ce(III) 2.0. It was found that the S914 and S920 resins significantly exceed the S924 and S924/K in terms of their ability to adsorb rhodium(III), therewith preliminary holding of the solutions at a temperature of ~80°С leads to an increase in the capacity of these resins for rhodium(III) and an increase in the rate of rhodium(III) sorption on S914 resin. The rate of sorption of rhodium(III) on the S914 resin, regardless of the method of preliminary preparation of solutions at room temperature, is low and noticeably increases with a rise in the sorption temperature to 60°C. The possibility of deep extraction of rhodium(III) (up to 99%) from multicomponent chloride solutions preliminarily kept at a temperature of ~80°C on the S914 resin with thiouronium functional groups under dynamic and static conditions at 56°C has been shown.

中文翻译：

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含硫脲基官能团的离子交换树脂上氯化物溶液中铑（III）的吸附特征

摘要

研究了铑（III）在离子交换树脂Purolite S914与硫脲鎓络合物，Purolite S920与异硫脲鎓络合物，具有硫醇官能团的Purolite S924 / K和同时含有硫醇和羧基的Purolite S924 / K（以下称为S914，S920，S924和（分别为S924 / K）来自4 M的盐酸溶液，该溶液先前在（g L ^–1）存在下保持在室温或〜80°C的温度下）：Fe（III）6.0，Al（III）4.2，Zn（II）5.2，Sn（IV）4.1和Ce（III）2.0。发现在吸附铑（III）的能力方面，S914和S920树脂大大超过了S924和S924 / K，因此将溶液初步保持在约80°С的温度下会导致容量增加这些用于铑（III）的树脂的使用以及铑（III）在S914树脂上的吸附速率的增加。不论在室温下预先制备溶液的方法如何，铑（III）在S914树脂上的吸附速率都较低，并且随着吸附温度升高至60°C而显着增加。