Gallic acid modified and green cross-linked chitosan-dialdehyde cellulose antibacterial aerogels and adsorption of anionic dyes

IF 4.5 3区工程技术 Q1 CHEMISTRY, APPLIED Reactive & Functional Polymers Pub Date : 2024-10-26 DOI:10.1016/j.reactfunctpolym.2024.106076

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Abstract

In this paper, a new green method for preparing multifunctional chitosan-based aerogels was prepared by using natural plant polyphenols instead of traditional chemical crosslinking agents. The aerogel was crosslinked by a Schiff base reaction between chitosan and cellulose aldehyde, and then functionalized with gallic acid to enhance the structure and endow antibacterial properties. The aerogel displayed a three-dimensional, cross-linked porous structure and exhibited selective adsorption of anionic dyes. The theoretical maximum adsorption capacity of amaranth was 450.89 mg/g. The adsorption process is more consistent with the pseudo-second-order kinetic model and the Langmuir isotherm model, indicating that the adsorption process is monolayer chemical adsorption. The aerogel exhibited superior adsorption performance at a pH value of 4, with the adsorption mechanism predominantly being electrostatic adsorption. The maximum inhibition zones of the aerogels on E. coli and S. aureus were 19.8 mm and 16.8 mm, respectively, and the adsorption value of Cr (VI) was greater than 160 mg/g. The chitosan-based aerogel proposed in this paper may be a promising material for treating complex wastewater containing dyes and heavy metals.

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没食子酸改性和绿色交联壳聚糖-二甲醛纤维素抗菌气凝胶及其对阴离子染料的吸附作用

本文采用天然植物多酚代替传统化学交联剂，制备了一种新型绿色方法来制备多功能壳聚糖基气凝胶。气凝胶通过壳聚糖和纤维素醛之间的希夫碱反应进行交联，然后用没食子酸进行官能化，以增强其结构并赋予其抗菌特性。气凝胶呈现出三维交联多孔结构，对阴离子染料具有选择性吸附作用。苋菜的理论最大吸附容量为 450.89 毫克/克。吸附过程与伪二阶动力学模型和 Langmuir 等温线模型较为一致，表明吸附过程为单层化学吸附。气凝胶在 pH 值为 4 时表现出优异的吸附性能，吸附机理主要是静电吸附。气凝胶对大肠杆菌和金黄色葡萄球菌的最大抑菌区分别为 19.8 毫米和 16.8 毫米，对六价铬的吸附值大于 160 毫克/克。本文提出的壳聚糖气凝胶可能是一种处理含有染料和重金属的复杂废水的有前途的材料。

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来源期刊

Reactive & Functional Polymers 工程技术-高分子科学

CiteScore

8.90

自引率

5.90%

发文量

259

审稿时长

27 days

期刊介绍： Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers. Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.