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Extraction of gold(III) using novel gemini-type benzimidazole ionic liquid from hydrochloric acid medium
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2021-07-21 , DOI: 10.1016/j.seppur.2021.119312
Ping Lv 1 , Ronghao Liu 1 , Yangyang Wang 1 , Xiaoxia Liu 1 , Yang Wu 1 , Wenfeng Xue 1 , Yanzhao Yang 1
Affiliation  

In this study, a novel gemini-type benzimidazole ionic liquid [C6BIM2][NTf2]2 was synthesized for efficient extract gold(III) from hydrochloric acid medium. Firstly, a series of parameters (e.g., vibrating time, the extractant concentration, acidity and salinity) were optimized and obtained the optimal extraction condition. Under this condition, the extraction efficiency can reach 98.42%, along with the distribution ratio of 186.87. Through the response surface methodology (RSM) model optimization, the amount of [C6BIM2][NTf2]2 corresponding to different HCl concentration was determined for gold(III) extraction during actual operation. Then, verified the anion exchange mechanism with the aid of Job’s method, UV–vis, FT-IR and 13C NMR. Thermodynamic parameters were calculated and implied that the extraction reaction was an exothermic and spontaneous process. Furthermore, organic phase loaded with gold(III) was easy to be completely stripped by CS(NH2)2/ HCl solution and its extraction ability was kept constant after 5 cycles extraction experiments. Meanwhile, [C6BIM2][NTf2]2 has a superb ability to select gold(III) in the multi-metal solution. In general, [C6BIM2][NTf2]2 showed distinguished selectivity and extraction ability for gold(III) from secondary resources, which was claimed to be a promising new style extractant.



中文翻译:

盐酸介质中新型双子型苯并咪唑离子液体提取金(III)

本研究合成了一种新型双子型苯并咪唑离子液体[C 6 BIM 2 ][NTf 2 ] 2,用于从盐酸介质中有效提取金(III)。首先,对一系列参数(如振动时间、提取剂浓度、酸度和盐度)进行优化,得到最佳提取条件。在此条件下,提取效率可达98.42%,分配比为186.87。通过响应面法(RSM)模型优化,[C 6 BIM 2 ][NTf 2 ] 2 量在实际操作中确定了对应于不同 HCl 浓度的金(III)提取。然后,借助Job 法、UV-vis、FT-IR 和13 C NMR验证了阴离子交换机制。计算了热力学参数,表明萃取反应是一个放热和自发过程。此外,载有金(III)的有机相很容易被CS(NH 2 ) 2 / HCl溶液完全汽提,经过5次循环萃取实验后其萃取能力保持不变。同时,[C 6 BIM 2 ][NTf 2 ] 2在多金属溶液中具有极好的选择金(III)的能力。一般来说,[C 6BIM 2 ][NTf 2 ] 2显示出从次生资源中提取金(III)的卓越选择性和提取能力,被认为是一种很有前途的新型提取剂。

更新日期:2021-07-27
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