Chang Kejian, Huang Huijuan, Meng Yuandong, Ju Zidan, Song Haiyan, Zhang Liang, Niu Xiaoqin, Li Zhi-Jun
College of Petrochemical Engineering, Longdong University Qingyang Gansu 745000 P. R. China
RSC Adv. 2023 Aug 7;13(34):23682-23689. doi: 10.1039/d3ra04184k. eCollection 2023 Aug 4.
Covalent organic frameworks (COFs), featured with crystalline structures, permanent porosity, and designable organic skeletons, are good candidates for serving as adsorbents. Herein, a new pyridine-based two-dimensional COF (TAPP-DBTA-COF) was constructed the condensation of 2,4,6-tris(4-aminophenyl)pyridine and 2,5-dibromobenzene-1,4-dicarbaldehyde. TAPP-DBTA-COF displayed high-performance for the removal of rhodamine B (Rh B) from water with high capacity, good adaptability and reusability. The maximum adsorption capacity for Rh B can reach up to 1254 mg g, and the kinetic constant was determined as = 0.00244 g mg min. Moreover, the corresponding amorphous polymer of TAPP-DBTA-COF, termed as TAPP-DBTA-COP, was synthesized from the same starting materials. The lower efficiency of TAPP-DBTA-COP in capture of Rh B revealed that the ordered pore structure, large specific surface area and rich adsorption sites play an important role in adsorption.
共价有机框架材料（COFs）具有晶体结构、永久孔隙率和可设计的有机骨架，是用作吸附剂的良好候选材料。在此，通过2,4,6-三（4-氨基苯基）吡啶与2,5-二溴苯-1,4-二甲醛的缩合反应构建了一种新型的基于吡啶的二维COF（TAPP-DBTA-COF）。TAPP-DBTA-COF在从水中去除罗丹明B（Rh B）方面表现出高性能，具有高容量、良好的适应性和可重复使用性。对Rh B的最大吸附容量可达1254 mg/g，动力学常数确定为k = 0.00244 g/(mg·min)。此外，由相同原料合成了TAPP-DBTA-COF的相应无定形聚合物，称为TAPP-DBTA-COP。TAPP-DBTA-COP在捕获Rh B方面效率较低，这表明有序的孔结构、大比表面积和丰富的吸附位点在吸附中起重要作用。
