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Synthesis of carboxymethyl cellulose-chitosan-montmorillonite nanosheets composite hydrogel for dye effluent remediation
International Journal of Biological Macromolecules ( IF 7.7 ) Pub Date : 2020-09-25 , DOI: 10.1016/j.ijbiomac.2020.09.154
Wei Wang , Jiaming Ni , Licai Chen , Zhong Ai , Yunliang Zhao , Shaoxian Song

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.



中文翻译:

羧甲基纤维素-壳聚糖-蒙脱土纳米片复合水凝胶的合成及染料废水修复

将MMNTS引入羧甲基纤维素-壳聚糖体系中,合成结构稳定,染料处理能力强的多孔水凝胶吸附剂。MMTNS边缘的Al-OH与-NH 2形成氢键(-OH··· + NH 3-在CS上,CS然后通过酰胺化和链交织与CMC合作,形成三维水凝胶。形态表征表明,水凝胶具有微孔开放框架结构,有利于大分子MB染料自由进入与水凝胶内部反应位点反应。因子测试表明,即使经过5次吸附-再生循环,通过0.2 g / L水凝胶在360分钟内仍可实现较高的MB去除率(97%)。由于MB分子在水凝胶均匀表面上的单层物理和化学吸附行为,其吸附过程遵循伪一级,伪二级动力学模型和Sips等温模型。吸附机理归因于离子交换,羧基和羟基的基团结合以及硅活性位反应。

更新日期:2020-09-30
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