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Synthesis of a novel fibrous material for effective Au(III) recovery with superior selectivity and one-step reduction

Lookup NU author(s): Professor David WernerORCiD

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Abstract

© 2022 Elsevier Ltd. To synthesize a material for effective Au(III) recovery with excellent selectivity and one-step reduction from solution remains a huge challenge. In this study, a novel fibrous material was synthesized by treating carbon nanofibers with ammonia-plasma followed by N-Aminorhodanine assembly; it was used for Au(III) recovery by sorption. The results demonstrated that the maximum sorption capacity of Au(III) by the N-Aminorhodanine assembled-carbon nanofibers (N-AMCNFs) reached 229 mg/g, which is 20.6 times that by carbon nanofibers (11 mg/g). Excellent Au(III) recovery by N-AMCNFs mainly resulted from its extremely hydrophilic nature indicated by a contact angle of 2.69 ° and the newly-introduced N- and S-containing soft base moieties (-C-N, -C=N, -C-S and -C=S). These sites provided electrons for coordination chelation with soft acid Au(III). Electrostatic attraction between AuCl4- and the positively-charged N-AMCNFs also served as a driving force for Au(III) recovery. Importantly, 44.3% of Au(III) was reduced to Au(0) by electrons transferred from S- and N-sites on rhodanine during sorption, as proved by XRD and XPS analysis. Besides, N-AMCNFs exhibited superior recovery selectivity indicated by above 96.24% recovery efficiency for Au(III) at pH 4 in the presence of multiple interfering ions including Cu(II), Ni(II), Zn(II), and Pb(II) at 50 mg/L as Au(III), but their recovery was below 2%.

Publication metadata

Author(s): Yu X, He J, Yan C, Chu Y, Hu J, Jia W, Lv H, Zhang H, Wang P, Werner D, Wang X

Publication type: Article

Publication status: Published

Journal: Journal of Environmental Chemical Engineering

Year: 2023

Volume: 11

Issue: 1

Print publication date: 01/02/2023

Online publication date: 22/12/2022

Acceptance date: 16/12/2022

ISSN (print): 2213-2929

ISSN (electronic): 2213-3437

Publisher: Elsevier BV

URL: https://doi.org/10.1016/j.jece.2022.109176

DOI: 10.1016/j.jece.2022.109176

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