Adsorption Performances and Mechanisms of Amidoxime Resin toward Gallium(III) and Vanadium(V) from Bayer Liquor

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• 作者：Zhuo Zhao ; Xiaohang Li ; Yanquan Chai ; Zhongsheng Hua ; Yanping Xiao ; Yongxiang Yang
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：January 4, 2016
• 年：2016
• 卷：4
• 期：1
• 页码：53-59
• 全文大小：427K
• ISSN：2168-0485

文摘

The adsorption of Ga(III) and V(V) onto an amidoxime resin (LSC700) has been investigated. The parameters studied include the effects of contact time, initial metal ions concentration, and temperature by batch method. The adsorption capacity of the resin for Ga(III) and V(V) was found to be 29.24 and 22.60 mg/g, respectively. The adsorption kinetics of Ga(III) and V(V) onto LSC700 could be well elucidated with Lagergren-second-order equation. The Langmuir isotherm fitted the experimental data well, indicating a homogeneous adsorption. Thermodynamic parameters, involving ΔG, ΔH, and ΔS were also calculated from graphical interpretation of the experimental data. Negative values of ΔG indicated that adsorption processes for both metal ions onto LSC700 were spontaneous. The standard heats of adsorption ΔH were found to be endothermic, and the entropy change values ΔS were calculated to be positive for the adsorption. The adsorption mechanism of LSC700 toward Ga(III) was exploited using FT-IR spectroscopy indicating the formation of a complex between the amidoxime group of LSC700 and [Ga(OH)₄]^? through oxygen binding mode. Finally, a novel process for separation and recovery of gallium and vanadium from Bayer liquor was proposed.