Design and preparation of novel functional resin D301-g-polyvinylimidazole for recovering Au(III) from aqueous solution

• Published in: Desalination and water treatment 2021-04, Vol.220, p.232-240
• Main Authors: Gao, Feng, Gao, Wen-Hua, Feng, Xiao-Qin, Hu, Tuo-Ping, Gao, Jian-Feng, An, Fu-Qiang
• Format: Article
• Language: English
• Subjects: 1-Vinylimidazole; Adsorption; Au(III); D301; Graft polymerization
• ISSN: 1944-3986; 1944-3986
• DOI: 10.5004/dwt.2021.27006

Resin adsorbent for gold recovery have the characteristics of simple preparation, good reusability and low consumption performance, but their shortcomings of low adsorption efficiency and poor adsorption capacity cannot be ignored. Based on this, a novel adsorbent with high adsorption performance towards Au(III) was prepared by functionalizing D301 resin with 1-vinylimidazole using the surface-initiated graft-polymerization method. The physicochemical characteristics of D301-g-PVIM (PVIM – polyvinylimidazole) were characterized by Fourier-transform infrared spectroscopy, scanning electron microscopy, Brunauer–Emmett–Teller and elemental analysis. The adsorption capacity of Au(III) was studied by a static adsorption experiment. The maximum adsorption capacity of D301-g-PVIM for Au(III) was 543.9 mg g–1. The kinetic study shows that the adsorption data can well described by the pseudo-second-order kinetic model. The equilibrium isotherm for the adsorption of Au(III) on D301-g-PVIM has a good correlation with the Freundlich model, and the adsorption is a multilayer sorption. The adsorption thermodynamics study indicated that the adsorption process is spontaneously endothermic. Repeated use experiments showed that D301-g-PVIM has high efficiency and good regeneration performance.