Preparation of cellulose-based composite hydrogels for the removal of methylene blue

Q2 Materials Science

Polymers from Renewable Resources Pub Date : 2023-11-27 DOI:10.1177/20412479231212947

Lizbeth Aymara, Nora Gabriela Herrera, Hélmer Helí Lezama, N. A. Villacrés

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引用次数: 0

Abstract

The discharge of dyes, including methylene blue (MB), contributes to environmental pollution. Adsorption is one of the most widely used techniques for removing colorants from water, with hydrogels being the materials that have attracted the most attention due to their excellent adsorption capacity. In this work, hydrogels composed of cellulose/pectin/starch were synthesized to remove MB dissolved in water. For the characterization of the hydrogel, Fourier-Transform Infrared, Thermogravimetry/Differential Thermal Analysis, XRD, and Scanning Electron Microscopy techniques were applied. At pH 9, the maximum swelling capacity (326.1%) of the hydrogel and the maximum MB removal percentage (37.05%) were obtained. The Weber-Morris diffusion kinetic model indicated that other adsorption mechanisms exist in addition to the diffusion process of MB through the hydrogel pores. Temkin's model better described the adsorption process, therefore an interaction between the adsorbate and the adsorbent surface is assumed, while the MB adsorption kinetics at pH 5 followed a pseudo-first-order model; and at pH 7 and pH 9, they followed a pseudo-second-order model.

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制备去除亚甲基蓝的纤维素基复合水凝胶

包括亚甲基蓝（MB）在内的染料排放造成了环境污染。吸附是去除水中着色剂最广泛使用的技术之一，水凝胶因其出色的吸附能力而成为最受关注的材料。在这项工作中，合成了由纤维素/pectin/淀粉组成的水凝胶，用于去除溶解在水中的甲基溴。在对水凝胶进行表征时，采用了傅立叶变换红外光谱、热重/差热分析、X 射线衍射和扫描电子显微镜技术。在 pH 值为 9 时，水凝胶的溶胀能力达到最大值（326.1%），甲基溴去除率达到最大值（37.05%）。韦伯-莫里斯扩散动力学模型表明，除了甲基溴通过水凝胶孔隙的扩散过程外，还存在其他吸附机制。Temkin 模型更好地描述了吸附过程，因此假定吸附剂和吸附剂表面之间存在相互作用，而 pH 值为 5 时，甲基溴的吸附动力学遵循伪一阶模型；pH 值为 7 和 9 时，则遵循伪二阶模型。

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

Polymers from Renewable Resources Materials Science-Polymers and Plastics

CiteScore

3.50

自引率

0.00%

发文量

期刊介绍： Polymers from Renewable Resources, launched in 2010, publishes leading peer reviewed research that is focused on the development of renewable polymers and their application in the production of industrial, consumer, and medical products. The progressive decline of fossil resources, together with the ongoing increases in oil prices, has initiated an increase in the search for alternatives based on renewable resources for the production of energy. The prevalence of petroleum and carbon based chemistry for the production of organic chemical goods has generated a variety of initiatives aimed at replacing fossil sources with renewable counterparts. In particular, major efforts are being conducted in polymer science and technology to prepare macromolecular materials based on renewable resources. Also gaining momentum is the utilisation of vegetable biomass either by the separation of its components and their development or after suitable chemical modification. This journal is a valuable addition to academic, research and industrial libraries, research institutions dealing with the use of natural resources and materials science and industrial laboratories concerned with polymer science.