Micro-mechanism insights into the adsorption of anionic dyes using quaternary ammonium-functionalised chitosan aerogels.

Autor: Du N; College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China., Huang LY; College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China., Xiong YS; College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China., Tian R; College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China., Yin JY; College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China., Cao DY; College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China., Hu DB; College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China., Lu HQ; College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China., Li W; Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, School of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning 530008, China., Li K; College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China; Provincial and Ministerial Collaborative Innovation Center for Sugar Industry, Nanning 530004, China; Engineering Research Center for Sugar Industry and Comprehensive Utilization, Ministry of Education, Guangxi University, Nanning 530004, China. Electronic address: gxlikai@gxu.edu.cn.
Jazyk: angličtina
Zdroj: Carbohydrate polymers [Carbohydr Polym] 2023 Aug 01; Vol. 313, pp. 120855. Date of Electronic Publication: 2023 Mar 30.
DOI: 10.1016/j.carbpol.2023.120855
Abstrakt: The development of adsorbents with outstanding adsorption capacities, wide versatility, and excellent recyclability for the removal of organic dyes remains a challenge. In this study, a quaternised chitosan-based aerogel (QCSA) was fabricated via a facile method to effectively treat concomitant anionic dyes. Porous QCSA with high hydrophilicity, nontoxicity, excellent thermal stability, and sustainability exhibits adsorption properties superior to most previously reported adsorbents. The equilibrium adsorption capacities for Congo red, Sunset yellow, and Methyl orange were 1259.6, 550.2, and 607.5 mg/g, respectively. Notably, the spent QCSA exhibits excellent cyclic performance. The multilayer adsorption, external-internal mass transfer resistance, and adsorption on the active site models were employed to enable a more accurate description of the dynamic characteristics, confirming that double-layer chemisorption was the dominant process. A quantitative analysis of the electrostatic potential and the independent gradient model further verified that electrostatic interactions, hydrogen bonding, and van der Waals forces led to the highly efficient adsorption of dye molecules. Therefore, the eco-friendly and recyclable QCSA is a promising adsorbent for trapping anionic dyes from aquatic systems.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023. Published by Elsevier Ltd.)
Databáze: MEDLINE
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