School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, China.
School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, China.
J Colloid Interface Sci. 2019 Apr 15;542:253-262. doi: 10.1016/j.jcis.2019.02.025. Epub 2019 Feb 7.
Polysaccharide is a renewable, biocompatible and biodegradable material that has received considerable attention. In this work, a series of polysaccharide gels were synthesized from the chemical cross-linking of pullulan with diglycerols. The effects of the diglycerol chain length on the performance of the gels were evaluated by XRD, TGA, SEM, rheological testings and swelling measurements. Overall, increasing the chain length resulted in a smaller pore size and stronger mechanical strength. Tetramethylene glycol diglycidyl ether (longest chain length)-derived Gel-T, which had the best performance (acceptable porous structure, good swelling ability and strong rigidity), was used to produce a nanocomposite hydrogel with montmorillonite (MMT). The incorporation of MMT led to a decrease in gel swelling and an increase in gel strength. The obtained nanocomposite system exhibited excellent adsorption properties (80 mg/g) towards crystal violet, and the adsorption behaviours were well represented by the pseudo-second-order kinetic and Langmuir isotherm models. Altogether, this study provides a better understanding of the structure-function relationships of pullulan-constructed hydrogel materials and will help to design more practical adsorbents for dye removal.
多糖是一种可再生、生物相容和可生物降解的材料，受到了广泛关注。在这项工作中，通过双甘油与普鲁兰的化学交联合成了一系列多糖凝胶。通过 XRD、TGA、SEM、流变学测试和溶胀测量评估了双甘油链长对凝胶性能的影响。总的来说，增加链长会导致孔径更小，机械强度更强。具有最佳性能（可接受的多孔结构、良好的溶胀能力和较强的刚性）的四亚甲基二醇二缩水甘油醚（最长链长）衍生的 Gel-T 被用于与蒙脱土（MMT）制备纳米复合水凝胶。蒙脱土的加入导致凝胶溶胀减少，凝胶强度增加。所得纳米复合体系对结晶紫表现出优异的吸附性能（80mg/g），吸附行为很好地由伪二阶动力学和朗缪尔等温线模型表示。总之，本研究深入了解了普鲁兰构建的水凝胶材料的结构-功能关系，并将有助于设计更实用的染料去除吸附剂。
