Green chemical synthesis of new chelating fiber and its mechanism for recovery gold from aqueous solution

Weiquan Zhang; Lina Wu; Xiaoxiang Han; Lanying Yao; Shengze Zhao; Jing Sun; Yanping Xu; Jionghui Li; Chunhua Xiong

doi:10.1016/j.jhazmat.2019.05.067

Green chemical synthesis of new chelating fiber and its mechanism for recovery gold from aqueous solution

J Hazard Mater. 2019 Oct 15:378:120674. doi: 10.1016/j.jhazmat.2019.05.067. Epub 2019 May 27.

Authors

Weiquan Zhang¹, Lina Wu², Xiaoxiang Han¹, Lanying Yao¹, Shengze Zhao¹, Jing Sun¹, Yanping Xu¹, Jionghui Li³, Chunhua Xiong⁴

Affiliations

¹ Department of Applied Chemistry, Zhejiang Gongshang University, No.149 Jiaogong Road, Hangzhou, 310012, PR China.
² School of Foreign Languages, Zhejiang Gongshang University, Hangzhou 310012, China.
³ School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China.
⁴ Department of Applied Chemistry, Zhejiang Gongshang University, No.149 Jiaogong Road, Hangzhou, 310012, PR China. Electronic address: xiongch@163.com.

PMID: 31301556
DOI: 10.1016/j.jhazmat.2019.05.067

Abstract

A novel environmentally-friendly polyacrylonitrile-2-amino-2-thiazoline chelating fiber (PANF-ATL) with good adsorption performance and thermal stability was synthesized in one step by nucleophilic addition reaction using water as a solvent. The optimum synthesis conditions for the chelating fibers are determined by controlling the synthesis temperature and the molar ratio of the reagents. The sulfur content and functional group capacity of the finally synthesized PANF-ATL were 3.82% and 1.19 mmol/g, respectively. PANF-ATL was characterized by elemental analysis, FTIR, TGA, SEM and XPS. Meanwhile, the adsorption characteristics and mechanism of PANF-ATL were evaluated. The Langmuir model and the pseudo-second-order model well described the adsorption of Au(Ⅲ) by PANF-ATL. The adsorption capacity of PANF-ATL obtained from Langmuir isotherm model towards Au(Ⅲ) was 130.58 mg/g (298 K). In addition, Au(Ⅲ) adsorbed on the fibers was completely eluted using a mixed solution of 4 mol/L HCl and 12% thiourea. It still has good adsorption performance after 5 adsorption-desorption cycles. Overall, PANF-ATL is a cost-effective adsorbent that can effectively adsorb Au(Ⅲ) in aqueous solution.

Keywords: Adsorption; Chelating fiber; Gold; Green chemical; Polyacrylonitrile fiber.

Publication types

Research Support, Non-U.S. Gov't