Extraction of gold(III) using novel gemini-type benzimidazole ionic liquid from hydrochloric acid medium

Ionic Liquids as Components of Systems for Metal Extraction

“…The [C 6 BIM 2 ][NTf 2 ] 2 ionic liquid based on the benzimidazolium cation was used to extract gold(III) from hydrochloric acid solutions [74]. The gold extraction efficiency was 98.42%.…”

Extraction of Au(iii) from hydrochloric acid media using a novel amide-based ionic liquid

“…More importantly, the results show that there is a competition between Cl − and AuCl 4 − , and it is preliminarily speculated that the extraction mechanism may be the anion exchange mechanism. 35…”

“…After extraction, the [DBA-Pyr][NTf 2 ]-Au complex showed absorption peaks at 234 nm and 320 nm, which were similar to those of the aqueous solution, indicating the successful combination of IL and Au( iii ). The slight shift of the maximum absorption peak (from 224 nm to 234 nm, from 313 nm to 320 nm) can be attributed to two aspects: (i) the solvent effect caused by different polarities of H 2 O and CHCl 3 makes the absorption peak shift; 35,38 (ii) there is an electrostatic interaction between AuCl 4 − and [DBA-Pyr] + , which makes the absorption peak shift. 39 The results showed that the existing state of AuCl 4 − did not change before and after extraction.…”

“…Here, Job's method (continuous variation method) was utilized to determine the coordination number of the extracted complex. [35][36][37] The total amount of Au(III) and [DBA-Pyr][NTf 2 ] was maintained at 12 Â 10 À6 mol; meanwhile, the portion change with Au(III) varied from 0.1 to 10 Â 10 À6 mM, respectively. Fig.…”

“…4 showed absorption peaks at 234 nm and 320 nm, which were similar to those of the aqueous solution, indicating the successful combination of IL and Au(III). The slight shift of the maximum absorption peak (from 224 nm to 234 nm, from 313 nm to 320 nm) can be attributed to two aspects: (i) the solvent effect caused by different polarities of H 2 O and CHCl 3 makes the absorption peak shift; 35,38 (ii) there is an electrostatic interaction between AuCl 4…”