Zhong-lin DONG, Tao JIANG, Bin XU, Qian LI, Yong-bin YANG
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引用次数: 0
摘要
系统研究了强碱阴离子交换树脂对硫代硫酸盐溶液中金的吸附行为和机理。金的吸附能力和选择性对比实验表明，带有 I 型季铵官能团的凝胶 Amberlite IRA-400 树脂具有更好的吸附性能。树脂用量、氨浓度和溶液 pH 值的增加有利于金的吸附，而铜和硫代硫酸盐浓度的增加则不利于金的吸附。显微表征结果表明，金是以[Au(S2O3)2]3- 复阴离子的形式与树脂官能团中的反离子 Cl- 交换而被吸附的。密度泛函理论计算结果表明，金的吸附主要依赖于[Au(S2O3)2]3- 中的 O 原子与树脂季铵官能团中的 H 原子之间产生的氢键和范德华力。
Adsorption behaviors and mechanisms of gold recovery from thiosulfate solution by ion exchange resin
The adsorption behaviors and mechanisms of gold from thiosulfate solution on strong-base anion exchange resin were systematically investigated. The comparison experiment of adsorption ability and selectivity for gold showed that gel Amberlite IRA-400 resin with Type I quaternary ammonium functional group had better adsorption performance. The increases of resin dosage, ammonia concentration and solution pH were favorable to gold adsorption, whereas the rises of cupric and thiosulfate concentrations were disadvantageous to gold loading. Microscopic characterization results indicated that gold was adsorbed in the form of [Au(S2O3)2]3– complex anion by exchanging with the counter ion Cl– in the functional group of the resin. Density functional theory calculation result manifested that gold adsorption was mainly depended on the hydrogen bond and van der Waals force generated between O atom in [Au(S2O3)2]3– and H atom in the quaternary ammonium functional group of the resin.
期刊介绍：
The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.
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