A pH-responsive carboxymethyl cellulose/chitosan hydrogel for adsorption and desorption of anionic and cationic dyes
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ORIGINAL RESEARCH
A pH-responsive carboxymethyl cellulose/chitosan hydrogel for adsorption and desorption of anionic and cationic dyes Wei Wang . Jinjing Hu . Rundong Zhang . Chao Yan . Li Cui . Junjiang Zhu
Received: 17 May 2020 / Accepted: 28 October 2020 Ó Springer Nature B.V. 2020
Abstract 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.
W. Wang J. Hu R. Zhang C. Yan (&) L. Cui (&) J. Zhu Hubei Key Laboratory of Biomass Fibers and Eco-Dying and Finishing, Wuhan Textile University, Wuhan 430073, Hubei, China e-mail: [email protected] L. Cui e-mail: [email protected]
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Cellulose
Graphic abstract
Keywords Interpenetrating network hydrogel Swelling reversibility pH response Adsorption/ desorption
Introduction In the last decades, the textile industry in Asia and especially in China, has developed rapidly and became the world’s largest textile producer and exporter (Chang and Ha-Brookshire 2011). Although the textile industry has brought economic prosperity, it has also brought challenges involving pollution. Due to the extensive use of new dyes and auxiliary chemicals, the composition of wastewater containing printing and textile dyes has become more-and-more complex. Therefore, printing and dyeing wastewater has become the primary pollution in the textile industry (Lotito et al. 2012). The methods of treating printing and dyeing wastewater could mainly include chemical oxidation (Luan et al. 2017), electrochemical (He et al. 2018), and adsorption method (Khamparia and Jaspal 2017), and some new approaches, such as photocatalytic degradation (Li et al. 2019), membrane separation (Li et al. 2018), and/or biological treatment (Xu et al. 2018). Although these
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