TRPO萃淋树脂从碱性氰化液中固相萃取Au(Ⅰ)机理研究

杨项军; 王世雄; 邹安琴; 陈景; 郭洪

doi:doi:10.3964/j.issn.1000-0593(2014)02-0483-06

光谱学与光谱分析, 2014, 34 (2): 483, 网络出版: 2015-01-13

TRPO萃淋树脂从碱性氰化液中固相萃取Au(Ⅰ)机理研究

Mechanism of Gold Solid Extraction from Aurocyanide Solution Using D3520 Resin Impregnated with TRPO

论文大纲

杨项军 ^*王世雄邹安琴陈景郭洪

作者单位

云南大学化学科学与工程学院，云南　昆明650091

金萃淋树脂 TRPO TRPO gold Extractant-impregnated resin FTIR FTIR XPS XPS

摘要

研究了TRPO-D3520萃淋树脂从碱性氰化液中固相萃取Au(CN)-2的性能，并借助傅里叶变换红外光谱(FTIR)、 X射线光电子能谱(XPS)和扫描电镜(SEM)等方法对固相萃取Au(Ⅰ)的机理进行了讨论。结果表明：阳离子表面活性剂CTMAB在固相萃取中起到了关键的作用，　当待萃水相中加入的CTMAB与Au(CN)-2的摩尔比达到1∶1时， TRPO-D3520萃淋树脂即对金具有良好的萃取性能；萃淋树脂负载金后， FTIR分析表明Au(CN)-2中的C≡N伸缩振动吸收峰位于2　144 cm-1， TRPO中的PO伸缩振动峰由1　153　cm-1向低频移至1　150　cm-1； N(1s)， Au(4f7/2)和Au(4f5/2)XPS谱揭示了树脂中金的价态和配位环境未发生变化，仍以Au(CN)-2形态存在于萃淋树脂中； O(1s) XPS谱图表明，经固相萃取后，树脂中化学结合水的含量明显增加，化学结合水的峰面积由30.74%增加至42.34%；固相萃取后， P(2p)XPS谱图峰位由132.15　eV增加至132.45　eV，说明PO基团与水分子存在一定的氢键作用，生成P=O…H—O—H。综上可推测， TRPO-D3520树脂固相萃取Au(CN)-2的过程为：［CTMA+·Au(CN)-2］离子对扩散至树脂孔内，被孔内的TRPO借助水分子为桥的氢键作用溶剂化而固相萃取。

Abstract

Trialkyphosphine oxides (TRPO) was successfully used for the impregnation of D3520 resin to prepare an extractant-impregnated resin (EIR). Solid extraction of Au(Ⅰ) from alkaline cyanide solution was studied using this extractant-impregnated resin (EIR), with addition of cetyltrimethylammonium bromide (CTMAB), directly into the aurous aqueous phase in advance. The mechanism of solid extraction was further investigated by means of FTIR, XPS and SEM. The column separation studies have shown that cationic surfactant CTMAB played a key role in the solid phase extraction, and the resin containing TRPO were effective for the extraction of gold when the molar ratio of CTMAB:Au(Ⅰ) reached 1:1. FTIR spectroscopy of gold loaded EIR showed that the frequency of C≡N stretching vibration was at 2　144 cm-1, and the frequency of PO stretching vibration shifted to lower frequency from 1　153 to 1　150　cm-1. The XPS spectrum of N(1s)， Au(4f7/2) and Au(4f5/2) suggested that the coordination environment of gold did not change before and after extraction, and gold was still as the form of Au(CN)-2 anion exiting in the loaded resin; O(1s) spectrum showed that the chemically combined water significantly increased after solid extraction from 30.74% to 42.34%; Comparing to the P(2p) spectrum before and after extraction, the binding energy increased from 132.15 to 132.45　eV, indicating there maybe existing hydrogen-bond interaction between PO and water molecule, such as P=O…H—O—H. The above results obtained established that in the solid extraction process, the hydrophobic ion association ［CTMA+·Au(CN)-2］ diffused from the bulk solution into the pores of the EIR, and then be solvated by TRPO adsorbed in the pores through hydrogen bonding bridged by the water molecules.

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杨项军, 王世雄, 邹安琴, 陈景, 郭洪. TRPO萃淋树脂从碱性氰化液中固相萃取Au(Ⅰ)机理研究[J]. 光谱学与光谱分析, 2014, 34(2): 483. YANG Xiang-jun, WANG Shi-xiong, ZOU An-qin, CHEN Jing, GUO Hong. Mechanism of Gold Solid Extraction from Aurocyanide Solution Using D3520 Resin Impregnated with TRPO[J]. Spectroscopy and Spectral Analysis, 2014, 34(2): 483.

TRPO萃淋树脂从碱性氰化液中固相萃取Au(Ⅰ)机理研究

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