高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (12): 2230.

• 研究论文 • 上一篇    下一篇

十四烷基二甲基苄基氯化铵萃取Au(CN)2-的微观机理

姜健准, 周维金, 高宏成, 吴瑾光, 徐光宪   

  1. 北京大学化学与分子工程学院, 北京100871
  • 收稿日期:2002-04-24 出版日期:2002-12-24 发布日期:2002-12-24
  • 通讯作者: 高宏成(1937年出生),男,教授,博士生导师,从事萃取与配合物化学研究.
  • 基金资助:

    云南省-北京大学科技合作项目(B9808k);国家自然科学基金(批准号:20023005)资助

Mechanism of Gold Extraction from Cyanide Solution by Tetradecyldimethylbenzylammonium Chloride

JIANG Jian-Zhun, ZHOU Wei-Jin, GAO Hong-Cheng, WU Jin-Guang, XU Guang-Xian   

  1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
  • Received:2002-04-24 Online:2002-12-24 Published:2002-12-24

摘要: 通过萃取平衡、傅里叶变换红外光谱及分峰技术研究了季铵盐十四烷基二甲基苄基氯化铵(TDM-BAC)-磷酸三丁酯(TBP)-正庚烷体系萃取Au(CN)2-的机理及过程.提出了萃合物的结构模型是基于氢键的超分子体系,组成为[R4N+]·[Au(CN)2-]·4H2O·4TBP.当有机相金浓度大于3g·L-1时,有机相中存在聚集现象.通过激光光散射技术测定了有机相中反向胶团的大小,表明萃取过程是分散在水相中的胶团在协萃剂(或助表面活性剂)作用下溶入有机相,转型为反向胶团或微乳液(W/O型)聚集状态.

关键词: 微乳液, Au(CN)2-, FTIR, 十四烷基二甲基苄基氯化铵, 反向胶团

Abstract: The mechanism of solvent extraction of gold from cyanide solution by quaternary ammonium salt, tetradecyldimethylbenzylammonium chloride(TDMBAC)/tri-n-butyl phosphate(TBP)/heptane was studied. The microstructure of complexes,[R4N+]·[Au(CN)2-]·4H2O·4TBP, in the organic phase was proposed based on hydrogen-bonding mechanism. Aggregations formed when gold (Ⅰ) mass concentration in the organic phase reached 3 g·L-1. The radii of aggregations were determined by dynamic laser scattering(DLS). During the extraction process, the complexes of TDMBAC and Au(CN)2- formed micelles in the aqueous phase. When cosolvent such as TBP was added to the aqueous phase, the complexes transferred into the organic phase and reversed micelles or microemulsion (W/O) were formed.

Key words: Microemulsion, Au(CN)2-, FTIR, Tetradecyldimethylbenzylammonium chloride, Reversed micelle

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