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A pH-responsive carboxymethyl cellulose/chitosan hydrogel for adsorption and desorption of anionic and cationic dyes
Cellulose ( IF 5.7 ) Pub Date : 2020-11-23 , DOI: 10.1007/s10570-020-03561-4
Wei Wang , Jinjing Hu , Rundong Zhang , Chao Yan , Li Cui , Junjiang Zhu

A carboxymethyl cellulose/chitosan interpenetrating network hydrogel was prepared to adsorb and desorb anionic and cationic dyes applying different pH conditions. The three-dimensional network structure of the hydrogel was investigated using Scanning Electron Microscopy (SEM). Fourier Transform Infrared (FT–IR) was used to analyze the bonding mechanism of the hydrogel. The compression modulus of the hydrogel under neutral conditions exhibited an increase in parallel with the increase of carboxymethyl cellulose content. Under alkaline conditions, the swelling properties of hydrogels in water were enhanced with the increase of the carboxymethyl cellulose content. On the other hand, under acidic conditions, the swelling performance of hydrogels in water was decreased with the increase of carboxymethyl cellulose content. The adsorption capacity and desorption ratio of carboxymethyl cellulose/chitosan hydrogel for Acid Orange II were higher than 100 mg/g and 90%, respectively, while for Methylene Blue were higher than 110 mg/g and 95% even after five adsorption/desorption cycles. This study suggests that the carboxymethyl cellulose/chitosan interpenetrating network hydrogel showed different swelling behaviors under different pH values, which could present great potential as carrier materials in the controllable release-based applications.

Graphic abstract



中文翻译:

pH响应的羧甲基纤维素/壳聚糖水凝胶,用于阴离子和阳离子染料的吸附和解吸

制备了羧甲基纤维素/壳聚糖互穿网络水凝胶,以吸附和解吸采用不同pH条件的阴离子和阳离子染料。使用扫描电子显微镜(SEM)研究了水凝胶的三维网络结构。傅立叶变换红外(FT-IR)用于分析水凝胶的键合机理。在中性条件下水凝胶的压缩模量显示出与羧甲基纤维素含量的增加平行的增加。在碱性条件下,水凝胶在水中的溶胀性随羧甲基纤维素含量的增加而增强。另一方面,在酸性条件下,水凝胶的溶胀性能随着羧甲基纤维素含量的增加而降低。羧甲基纤维素/壳聚糖水凝胶对酸性橙II的吸附容量和脱附率分别高于100 mg / g和90%,而对于亚甲基蓝,即使经过五个吸附/脱附循环,其吸附容量也分别高于110 mg / g和95%。 。这项研究表明,羧甲基纤维素/壳聚糖互穿网络水凝胶在不同的pH值下表现出不同的溶胀行为,在可控的基于释放的应用中作为载体材料可能具有巨大的潜力。

图形摘要

更新日期:2020-11-23
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