Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei 430070, China.
School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei 430070, China.
Int J Biol Macromol. 2019 Dec 1;141:98-107. doi: 10.1016/j.ijbiomac.2019.08.225. Epub 2019 Aug 29.
TiO loaded 2D montmorillonite (2DMMT)-chitosan-poly (acrylic acid) hydrogel with 3D network structure as a novel adsorbent for methylene blue (MB) removal was investigated. The hydrogel was formed via the polymerization and molecular forces between 2DMMT and polysaccharide. Physicochemical analysis and factor experiments were implemented on hydrogel. The results implied that hydrogel possessed a porous structure and high surface area, facilitating the access and removal of MB. A completely removal of MB could be achieved in a small hydrogel dose of 0.2 g/L within 120 min even after 5 regeneration cycles, which could lower costs and enhance efficiency dramatically. MB adsorption onto hydrogel was reasonably correlated with pseudo-second-order kinetic model and Redlich-Peterson isotherm model. MB adsorption mechanism onto hydrogel was analyzed by FTIR, EDS and XPS. It was found MB molecules reacted with carboxyl groups as well as substituted cation from 2DMMT. Such hydrogel could not only realize the green/sustainable application in water treatment, but also guide the preparation for polymer materials from polyelectrolyte and nanoclay.
负载 TiO2 的二维蒙脱石（2DMMT）-壳聚糖-聚丙烯酸水凝胶具有 3D 网络结构，可用作新型吸附剂以去除亚甲基蓝（MB）。水凝胶是通过 2DMMT 和多糖之间的聚合和分子力形成的。对水凝胶进行了物理化学分析和因素实验。结果表明，水凝胶具有多孔结构和高表面积，有利于 MB 的进入和去除。即使经过 5 次再生循环，在 0.2g/L 的小水凝胶剂量下，在 120min 内也能完全去除 MB，这可以显著降低成本并提高效率。MB 吸附到水凝胶上与拟二级动力学模型和 Redlich-Peterson 等温模型合理相关。通过 FTIR、EDS 和 XPS 分析了 MB 吸附到水凝胶上的机理。结果发现 MB 分子与羧基以及 2DMMT 中的取代阳离子发生反应。这种水凝胶不仅可以实现水处理中的绿色/可持续应用，还可以指导从聚电解质和纳米粘土制备聚合物材料。
