Special Glass Key Lab of Hainan Province, School of Materials Science and Engineering, Hainan University, Haikou 570228, China.
Special Glass Key Lab of Hainan Province, School of Materials Science and Engineering, Hainan University, Haikou 570228, China.
J Colloid Interface Sci. 2021 Jul 15;594:141-149. doi: 10.1016/j.jcis.2021.03.029. Epub 2021 Mar 15.
Chitosan is a promising substitute for heavy metal ion adsorbents. However, traditional pure chitosan adsorbents have certain disadvantages that limit their application. In this paper, a 'top modification' strategy was used to enhance the capturing ability of chitosan adsorbents. A chitosan aerogel was prepared via physical crosslinking and then enhanced by immersion in ethylenediamine tetraacetic anhydride solution. Finally, an enhanced chitosan aerogel was obtained, and analyses were used to describe its structure, adsorption properties and mechanism. Results showed that both the porous structure and the combined complexations dramatically improved the capturing ability of the chitosan aerogel for heavy metal ions. The theoretical adsorption capacities of the enhanced aerogel for Cu, Pb and Cd reached 108.14, 143.73 and 84.62 mg/g, respectively. Due to their environmental friendliness, good adsorption performance, easy separation and reusability, enhanced aerogels have become viable solutions to removing heavy metal pollutants from aquatic systems.
壳聚糖是一种很有前途的重金属离子吸附剂替代品。然而，传统的纯壳聚糖吸附剂存在一定的缺点，限制了它们的应用。本文采用“顶部修饰”策略来提高壳聚糖吸附剂的捕获能力。通过物理交联制备壳聚糖气凝胶，然后将其浸入乙二胺四乙酸酐溶液中进行增强。最后，得到了增强的壳聚糖气凝胶，并对其结构、吸附性能和机制进行了分析。结果表明，多孔结构和复合络合作用都显著提高了壳聚糖气凝胶对重金属离子的捕获能力。增强气凝胶对 Cu、Pb 和 Cd 的理论吸附容量分别达到 108.14、143.73 和 84.62 mg/g。由于其环境友好、吸附性能良好、易于分离和可重复使用，增强气凝胶已成为从水体中去除重金属污染物的可行方案。
