Investigation on the Extraction Mechanism of Au (I) from Cyanide Solution with Quaternary Ammonium System  

作　　者：Jian Zhun JIANG Wei Hong LI Wei Jin ZHOU Hong Cheng GAO Jin Guang WU Guang Xian XU 

机构地区：[1]Department of Applied Chemistry,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871

出　　处：《Chinese Chemical Letters》2003年第4期397-400,共4页中国化学快报(英文版)

基　　金：the National Natural Science Foundation of China (No.20023005 ) for financial support.

摘　　要：The mechanism of Au (I) extraction has been characterized using 198Au radiometry, thermodynamic equilibrium, Karl-Fischer titration and FT-IR spectroscopy techniques. The results indicate that the extraction follows ionic combination and solvent interaction mechanism. The stoichiometry of the extracted species is 1:1:4:4 for TDMBA+: Au(CN)2- : TBP : H2O. The microstructure model of the extracted complex is a supramolecular structure via hydrogen bonding, ion dipole interaction and ionic combination. The extraction process can be described as micelles in the aqueous phase transfer into the organic phase and reversed micelles or microemulsion (W/O) form in the organic phase.The mechanism of Au (I) extraction has been characterized using 198Au radiometry, thermodynamic equilibrium, Karl-Fischer titration and FT-IR spectroscopy techniques. The results indicate that the extraction follows ionic combination and solvent interaction mechanism. The stoichiometry of the extracted species is 1:1:4:4 for TDMBA+: Au(CN)2- : TBP : H2O. The microstructure model of the extracted complex is a supramolecular structure via hydrogen bonding, ion dipole interaction and ionic combination. The extraction process can be described as micelles in the aqueous phase transfer into the organic phase and reversed micelles or microemulsion (W/O) form in the organic phase.

关 键 词：Solvent extraction Au(CN)_2^- FT-IR tetradecyldimethylbenzylammonium chloride (TDMBAC). 

分 类 号：O658[理学—分析化学]