Covalent organic frameworks (COFs) are porous crystalline materials that have attracted considerable attention owing to their environmental-friendly photocatalytic characteristics. However, insufficient charge transfer and rapid charge recombination occur in the sunlight-driven photocatalytic performance of most COFs, which greatly impedes their photocatalytic activity. In this study, a donor-acceptor (D-A) COF, DTB-BT-COF, was synthesized using electron-deficient 4,4'-(benzo[c] [1,2,5]thiadiazole-4,7-diyl)dianiline (BT) and electron-rich 1,3-dihydroxy-2,4,6-trialdehyde benzene (DTB). With its D-A structure, DTB-BT-COF exhibited outstanding photocatalytic performance for Cr(VI) reduction, which can be attributed to the integrative effect of the remarkable light absorption ability and more efficient separation of the photogenerated charge carriers. More significantly, DTB-BT-COF has proven to be a highly efficient photocatalyst in the removal of different aqueous contaminants with rhodamine B, methylene blue, or metronidazole as scavengers, which could be attributed to the synergetic effect between photocatalytic oxidation and reduction by individually consuming photogenerated holes and electrons. This study provided a new way to construct highly efficient D-A COFs for the purification of wastewaters containing mixed heavy metal ions and organic pollutants.

共价有机骨架（COFs）是一种多孔晶体材料，由于其对环境友好的光催化特性而备受关注。然而，大多数COFs在阳光驱动的光催化性能中存在电荷转移不足和电荷复合快速的问题，这极大地阻碍了它们的光催化活性。在这项研究中，使用缺电子 4,4'-(benzo[c] [1,2,5]thiadiazole-4,7-diyl) 合成了供体-受体 (DA) COF，DTB-BT-COF二苯胺 (BT) 和富电子 1,3-二羟基-2,4,6-三醛苯 (DTB)。凭借其 DA 结构，DTB-BT-COF 表现出优异的 Cr(VI) 还原光催化性能，这可以归因于显着的光吸收能力和更有效的光生电荷载流子分离的综合效应。更重要的是，DTB-BT-COF 已被证明是一种高效的光催化剂，可用于去除罗丹明 B、亚甲蓝或甲硝唑作为清除剂的不同水性污染物，这可归因于光催化氧化和单独还原之间的协同效应。消耗光生空穴和电子。该研究为构建高效的DA COFs净化含有混合重金属离子和有机污染物的废水提供了一种新方法。或甲硝唑作为清除剂，这可能归因于光催化氧化和还原之间的协同效应，通过单独消耗光生空穴和电子。该研究为构建高效的DA COFs净化含有混合重金属离子和有机污染物的废水提供了一种新方法。或甲硝唑作为清除剂，这可能归因于光催化氧化和还原之间的协同效应，通过单独消耗光生空穴和电子。该研究为构建高效的DA COFs净化含有混合重金属离子和有机污染物的废水提供了一种新方法。