吸附
羧甲基纤维素
化学工程
化学
离子交换
微型多孔材料
壳聚糖
单层
朗缪尔吸附模型
氢键
蒙脱石
聚合物
高分子化学
材料科学
自愈水凝胶
分子
纤维素
有机化学
离子
钠
工程类
生物化学
作者
Wei Wang,Jiaming Ni,Licai Chen,Zhong Ai,Yunliang Zhao,Shaoxian Song
标识
DOI:10.1016/j.ijbiomac.2020.09.154
摘要
MMTNS were introduced into carboxymethyl cellulose-chitosan system to synthesize porous hydrogel adsorbent with stable structure and high dye handling capacity. Al-OH on edge of MMTNS formed hydrogen-bond (-OH···+NH3-) with -NH2 on CS, CS then cooperated with CMC via amidation and chains interleaving, forming three-dimensional hydrogel. Morphology characterization revealed that hydrogel possessed microporous open-framework structure, facilitating free entrance of macromolecular MB dye to react with internal reaction sites in hydrogel. Factor tests indicated that high removal (97%) of MB was achieved via 0.2 g/L hydrogel within 360 min even after 5 adsorption-regeneration cycles. Adsorption process followed Pseudo-first-order, Pseudo-second-order kinetic model and Sips isotherm model, owing to both monolayer physical and chemical adsorption behavior of MB molecules onto homogeneous surface of hydrogel. Adsorption mechanism was attributed to ion-exchange, groups combination of carboxyl and hydroxyl, and Si active sites reaction. Such hydrogel realized promotion of polysaccharide polymers in materials design and wastewater treatment.
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