<br>壳聚糖基双网络复合水凝胶用于亚甲基蓝染料的高效吸附,International Journal of Biological Macromolecules

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壳聚糖基双网络复合水凝胶用于亚甲基蓝染料的高效吸附
International Journal of Biological Macromolecules ( IF 7.7 ) Pub Date : 2022-09-26 , DOI: 10.1016/j.ijbiomac.2022.09.213
Xiaoxiao Wan ₁ , Zhihao Rong ₁ , Kaixuan Zhu ₁ , Yumin Wu ₁

Affiliation

随着纺织工业的快速发展，大量的染色废水排放对生态环境造成了极大的危害。在本工作中，通过将壳聚糖交联聚乙烯胺引入 N，N′-亚甲基双丙烯酰胺交联聚丙烯酸网络，制备了一种具有优异力学性能、良好可重用性和大吸附容量的双网络复合水凝胶吸附剂。双重交联网络赋予水凝胶优异的机械性能，最大拉伸应力和应变高达 1.9 MPa 和 920 %。亚甲基蓝在水凝胶上的吸附量高达 596.14 mg/g。此外，所制备的水凝胶表现出良好的可重复使用性，其吸附效率在连续 5 次循环中保持在 85% 以上。Pseudo-second-order kinetics 和 Langmuir 方程很好地拟合了吸附行为，表明水凝胶作为单层化学吸附到染料上。吸附机理分析表明，水凝胶官能团与亚甲基蓝分子之间的静电相互作用和氢键有助于水凝胶具有良好的吸附能力。总体而言，合成的复合水凝胶可用作去除亚甲基蓝染料的有效吸附剂，特别是从纺织工业废水中去除亚甲基蓝染料。

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Chitosan-based dual network composite hydrogel for efficient adsorption of methylene blue dye

With the rapid development of the textile industry, a large amount of dyeing wastewater discharge has caused great harm to the ecological environment. In this work, a dual-network, composite hydrogel adsorbent with excellent mechanical properties, good reusability, and large adsorption capacity was prepared by introducing chitosan cross-linked polyvinylamine into the N,N′-methylenebisacrylamide cross-linked polyacrylic acid network. The dual cross-linking network gave the hydrogel excellent mechanical properties with maximum tensile stress and strain up to 1.9 MPa and 920 %. The adsorption capacity of methylene blue on hydrogel was up to 596.14 mg/g. In addition, the prepared hydrogel exhibited good reusability, and their adsorption efficiency remained above 85 % in five consecutive cycles. The adsorption behavior was well fitted by Pseudo-second-order kinetics and the Langmuir equation, indicating that the hydrogel was chemisorbed to the dye as a monolayer. The adsorption mechanism analysis showed that the electrostatic interactions and hydrogen bonding between the functional groups of the hydrogels and methylene blue molecules contributed to the good adsorption capacity. Overall, the synthesized composite hydrogels could be used as an efficient adsorbent for the removal of methylene blue dye, particularly from textile industry wastewater.

更新日期：2022-09-26

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