Zhu Yaqin, Liu Yanbo, Xue Sen, Yang Haoqi, Han Xiaoshuai, Zhang Chunmei, Duan Gaigai, Huang Yong, Mao Haimei, Ma Chunxin, Jiang Shaohua
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China.
State Key Laboratory of New Textile Materials and Advanced Processing Technologies, School of Textile Science and Engineering, Wuhan Textile University, Wuhan 430200, China.
Int J Biol Macromol. 2025 Jun;313:144358. doi: 10.1016/j.ijbiomac.2025.144358. Epub 2025 May 17.
Ionic dyes are widely used and emitted in large quantities by modern industries. It is of great importance to develop efficient and practical adsorbent materials for the removal of such pollutants. Ionic covalent organic frameworks (COFs) with charged pore environments and stable backbone structures are excellent candidates for dye adsorbents. To improve the drawbacks of COF powder, which is not easy to be recycled and prone to secondary pollution, we report an effective strategy to prepare the composite material by immobilizing dispersed anionic COF on melamine foam sponge (MF@COF). Sodium alginate cross-linking method is developed as a powerful combination of COF and MF, with no powder falling off during adsorption. The composite material can quickly adsorb dyes, and the removal rate of cationic dyes can reach >99 % in 10 min; at the same time, it can selectively separate anionic dyes. The adsorption capacity of MF@COF for methylene blue (MB), crystal violet (CV), and malachite green (MG), was 947 mg g, 466 mg g and 1689 mg g in terms of the weight of COF, respectively. Compared with using the COF powder alone, the adsorption capacity of the composite material has been improved to a certain extent, with MB's adsorption capacity increasing by 6.16 %. Furthermore, MF@COF composite showed its practicality in practical water adsorption tests and could be recycled >5 times, which makes it a simple and practical adsorbent for water pollution control.
离子染料被现代工业广泛使用且大量排放。开发高效实用的吸附材料以去除此类污染物具有重要意义。具有带电孔环境和稳定骨架结构的离子共价有机框架（COF）是染料吸附剂的优秀候选材料。为了改善COF粉末不易回收且易产生二次污染的缺点，我们报道了一种通过将分散的阴离子COF固定在三聚氰胺泡沫海绵上制备复合材料（MF@COF）的有效策略。开发了海藻酸钠交联法，作为COF和MF的有力结合，吸附过程中无粉末脱落。该复合材料能快速吸附染料，对阳离子染料的去除率在10分钟内可达>99%；同时，它能选择性分离阴离子染料。就COF的重量而言，MF@COF对亚甲基蓝（MB）、结晶紫（CV）和孔雀石绿（MG）的吸附容量分别为947 mg g、466 mg g和1689 mg g。与单独使用COF粉末相比，复合材料的吸附容量有一定程度的提高，MB的吸附容量增加了6.16%。此外，MF@COF复合材料在实际水吸附测试中显示出实用性，可循环使用>5次，这使其成为一种简单实用的水污染控制吸附剂。
