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Updated: Nov 30, 2025

Preparation of Expanded Chitin Foams and their Use in the Removal of Aqueous Copper
Published on: February 27, 2021
Amidoxime-functionalized polyacrylamide-modified chitosan containing imidazoline groups for effective removal of Cu2+
Yang He1, Shaohua Gou2, Lihua Zhou1
1Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Southwest Petroleum University, Chengdu, Sichuan, 610500, China.
Abstract:
Herein, an amidoxime-functionalized chitosan (CTS) AM/AO/AEBI-CTS containing imidazoline groups was facilely prepared through amidoximation of cyano groups in cross-linked CTS obtained by crosslinking of imidazoline-functionalized polyacrylamide and CTS. AM/AO/AEBI-CTS exhibited porous structure, good water wettability, and higher selectivity for Cu2+ than Ni2+. The adsorption process correlated well with Sips isotherm and pseudo-second-order kinetics models. The adsorption capacities for Cu2+ and Ni2+ onto AM/AO/AEBI-CTS were 190.7 and 128.9 mg/g, respectively. The adsorption thermodynamics demonstrated that the adsorption of Cu2+ and Ni2+ ions onto AM/AO/AEBI-CTS was a spontaneous endothermic process. The FTIR and XPS analyses revealed that nitrogen and oxygen atoms were involved in the chelation with metal ions. The presence of Na+, K+ and Ca2+ had weakly impact on the adsorption efficiency of AM/AO/AEBI-CTS. Furthermore, the adsorption efficiency of AM/AO/AEBI-CTS remained above 90 % after five adsorption-desorption successive cycles. Overall, this CTS material has a good application prospects for wastewater treatment.
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