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

作者：Zhao, Zhuo^*; Li, Xiaohang; Chai, Yanquan; Hua, Zhongsheng; Xiao, Yanping; Yang, Yongxiang

来源：ACS Sustainable Chemistry and Engineering, 2016, 4(1): 53-59.

DOI：10.1021/acssuschemeng.5b00307

• Gallium
• Vanadium
• Kinetics
• Isotherms
• Adsorption mechanisms

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 Delta G, Delta H, and Delta S were also calculated from graphical interpretation of the experimental data. Negative values of Delta G indicated that adsorption processes for both metal ions onto LSC700 were spontaneous. The standard heats of adsorption Delta H were found to be endothermic, and the entropy change values Delta S 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.

• 出版日期2016-1
• 单位安徽工业大学