Guangxi Key Laboratory of Polysaccharide Materials and Modification, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, Guangxi, PR China; Key Laboratory of Chemical and Biological Transforming Process of Guangxi Higher Education Institutes, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, Guangxi, PR China.
Guangxi Key Laboratory of Polysaccharide Materials and Modification, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, Guangxi, PR China; Key Laboratory of Chemical and Biological Transforming Process of Guangxi Higher Education Institutes, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, Guangxi, PR China.
Int J Biol Macromol. 2021 Jun 30;181:786-792. doi: 10.1016/j.ijbiomac.2021.03.116. Epub 2021 Mar 22.
In this study, chitin aerogel doped with nano-calcium carbonate (CaCO/chitin aerogel) was prepared by dissolving chitin in NaCO/Ca (OH)/urea system followed by epichlorohydrin (ECH) addition as a cross-linker and then freeze-drying of the hydrogel. The as-obtained CaCO/chitin aerogel showed good adsorption properties toward the adsorption of Congo Red (CR) with maximum adsorption capacity reaching approximately 266.4 mg·g. Besides, the adsorption capacity was affected by the initial concentration and pH. The adsorption kinetics revealed a second-order kinetics model of CaCO/chitin aerogel toward CR, and the adsorption process was controlled by both the liquid film diffusion and intra-particle diffusion. In sum, chitin aerogel looks promising as an effective adsorbent for anion dye adsorption. The cost-effective and eco-friendly developed approaches are also of great interest for future environmental remediation.
在这项研究中，通过溶解甲壳素在 NaCO/Ca(OH)/尿素体系中，然后加入作为交联剂的环氧氯丙烷（ECH），再经过水凝胶的冷冻干燥，制备了掺杂纳米碳酸钙（CaCO/甲壳素气凝胶）。所得到的 CaCO/甲壳素气凝胶对刚果红（CR）的吸附表现出良好的吸附性能，最大吸附容量约为 266.4mg·g。此外，吸附容量受初始浓度和 pH 的影响。吸附动力学表明，CaCO/甲壳素气凝胶对 CR 的吸附符合二级动力学模型，吸附过程同时受液膜扩散和颗粒内扩散控制。总之，甲壳素气凝胶作为阴离子染料吸附的有效吸附剂具有广阔的应用前景。所开发的经济高效且环保的方法对于未来的环境修复也具有重要意义。
