Fabrication of bio-polymer-based hydrogel for methylene blue remediation: Kinetics, mechanisms, and environmental implications

IF 2.3 4区工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY

Separation Science and Technology Pub Date : 2023-11-18 DOI:10.1080/01496395.2023.2282371

Aftab Majeed, Luqman Ali Shah, S. Faizan, Hameed Ullah

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Abstract

ABSTRACT Due to the presence of highly persistent and non-biodegradable dyes that are capable of causing harm to people, plants, animals, and the environment, the treatment of dye-contaminated water tends to be highly challenging. In the current work, polyacrylic acid and bio-polymer-based hydrogels of hydroxyl ethyl cellulose (HEC) were prepared through the free radical polymerization method and were used as adsorbents for the adsorption of methylene blue (MB). To estimate the nature and mechanism of adsorption, kinetics, and isotherm models were adopted. Pseudo-second-order kinetic model was followed by the sorption of MB. Results demonstrated that with an increase in concentration of dye dosage, adsorption increases linearly. Freundlich isotherm model was followed for the sorption of MB onto polyacrylic acid and bio-polymer-based hydrogels. Thermodynamic study of the adsorption process reveals that the adsorption process was spontaneous and endothermic as inferred from Gibbs free energy and enthalpy values of 33.08 kJ/mol and 3.83 kJ/mol at 303K, respectively. Recycling performance was tested and inferred that bio-polymer-based hydrogel having 0.6 gm. Hydroxyethyl cellulose decreases its adsorption efficiency equivalent to 5% after consecutive five cycles. The bio-polymer-based hydrogels will be used as an effective adsorbent for removing cationic dyes from wastewater on an industrial scale.

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制造用于亚甲基蓝修复的生物聚合物水凝胶：动力学、机制和环境影响

摘要由于染料具有高度持久性和不可生物降解性，能够对人类、植物、动物和环境造成危害，因此染料污染水的处理往往具有很高的挑战性。本研究通过自由基聚合法制备了聚丙烯酸和生物基羟乙基纤维素（HEC）水凝胶，并将其用作吸附亚甲基蓝（MB）的吸附剂。为了估计吸附的性质和机理，采用了动力学和等温线模型。甲基溴的吸附遵循伪二阶动力学模型。结果表明，随着染料用量浓度的增加，吸附量呈线性增加。甲基溴在聚丙烯酸和生物聚合物水凝胶上的吸附采用了 Freundlich 等温线模型。对吸附过程的热力学研究表明，在 303K 时，吉布斯自由能和焓值分别为 33.08 kJ/mol 和 3.83 kJ/mol，由此推断吸附过程是自发和内热的。测试结果表明，生物聚合物水凝胶中含有 0.6 克羟乙基纤维素，可降低水凝胶的回收率。羟乙基纤维素在连续循环 5 次后，其吸附效率下降了 5%。基于生物聚合物的水凝胶将作为一种有效的吸附剂，用于在工业规模上去除废水中的阳离子染料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Separation Science and Technology 工程技术-工程：化工

CiteScore

6.10

自引率

3.60%

发文量

131

审稿时长

5.7 months

期刊介绍： This international journal deals with fundamental and applied aspects of separation processes related to a number of fields. A wide range of topics are covered in the journal including adsorption, membranes, extraction, distillation, absorption, centrifugation, crystallization, precipitation, reactive separations, hybrid processes, continuous separations, carbon capture, flocculation and magnetic separations. The journal focuses on state of the art preparative separations and theoretical contributions to the field of separation science. Applications include environmental, energy, water, and biotechnology. The journal does not publish analytical separation papers unless they contain new fundamental contributions to the field of separation science.

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