Selective removal of Au(III) from wastewater by pyridine-modified chitosan

Lingyuan Chen; Jiali Tang; Suoque Wu; Shixing Wang; Zhaogang Ren

doi:10.1016/j.carbpol.2022.119307

Selective removal of Au(III) from wastewater by pyridine-modified chitosan

Carbohydr Polym. 2022 Jun 15:286:119307. doi: 10.1016/j.carbpol.2022.119307. Epub 2022 Mar 3.

Authors

Lingyuan Chen¹, Jiali Tang², Suoque Wu¹, Shixing Wang², Zhaogang Ren³

Affiliations

¹ College of Environmental Science and Engineering, China West Normal University, Nanchong, Sichuan 637009, China.
² Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China.
³ College of Environmental Science and Engineering, China West Normal University, Nanchong, Sichuan 637009, China. Electronic address: renzhaogang@cwnu.edu.cn.

PMID: 35337515
DOI: 10.1016/j.carbpol.2022.119307

Abstract

A pyridine-modified chitosan (PMCS) adsorbent with excellent adsorption performance and specific selectivity for Au(III) in wastewater was prepared. FTIR, SEM, XPS and XRD were used to study its adsorption performance, and various models were used to fit and analyze the experimental adsorption data. The maximum adsorption capacity of PMCS for Au(III) is 549.41 mg/g (298 K, pH = 4). The data analysis results prove that the PSO and Langmuir models best describe the adsorption process. Adsorption experiments in the presence of multiple ions proved that PMCS is selective for the adsorption of Au(III). The adsorption and desorption experiments showed that the adsorption rate of PMCS could still reach 94.77% after three cycles. In summary, PMCS was demonstrated to be a high-quality material for the adsorption of Au(III) from wastewater due to its excellent adsorption performance, specific selectivity and reusability.

Keywords: Adsorption; Au(III); Chitosan; Mechanism.