Recyclable chitosan adsorbent: Facile functionalization strategy, excellent removal capacity of dyes and adsorption mechanism

被引：5
作者：
Hui Y. [1 ]
Liu R. [2 ]
Lan J. [1 ]
Sun T. [1 ]
Xu A. [1 ]
机构：
[1] School of Chemistry and Chemical Engineering, Henan University of Science and Technology, Henan, Luoyang
[2] State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Hunan, Changsha
来源：
Chemosphere | 2024年 / 359卷
基金：
中国国家自然科学基金;
关键词：
Adsorption mechanism; Chitosan; Extraordinary dye adsorption; Polyethyleneimine;
D O I：
10.1016/j.chemosphere.2024.142291
中图分类号：
学科分类号：
摘要：
The development of chitosan-based adsorbents with facile preparation, high adsorption performance and reusability for the removal of contaminant dyes remains a persistent challenge. To overcome this challenge, herein, we have developed a novel and extremely facile one-step strategy by which a new high-performance chitosan/polyethyleneimine/polyethylene glycol diglycidyl ether adsorbent (named as CC/PEI/PGDE) has been successfully fabricated via direct functionalization of CC by PEI at ambient temperature followed by subsequent freeze-drying. The Box-Behnken Design was employed to optimize the concentrations of adsorbent components. Attractively, this adsorbent exhibit outstanding adsorption performances to congo red (RED), acid blue-25 (BLUE) and amino black-10B (BLACK) with 2901 mg g−1 (90.9 %), 3434 mg g−1 (90.9 %), and 1438 mg g−1 (90.1 %) of adsorption capacities (removal efficiencies), respectively, and maintains nearly the same adsorption behaviors to original adsorbent even after 6 cycles of adsorption-desorption processes. Meanwhile, three kinetic models, three isothermal models, and the Vant Hoff model are employed to further investigate the adsorption behaviors of RED, BLUE, and BLACK dyes by CC/PEI/PGDE. The results from SEM, EDS, BET, FT-IR, pHZPC and XPS confirm that hydrogen bond interactions and electrostatic attractions play crucial roles in facilitating dyes adsorption by CC/PEI/PGDE. It is expected that this work can bring forward a new perspective for the facile design of high-performance adsorbent for removing anionic dyes from wastewater. © 2024 Elsevier Ltd
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