Design and synthesis of [4+4]-type covalent organic frameworks for the synergistic removal of organic pollutants by adsorption-photodegradation

Abstract The [4+4]-type Covalent Organic Frameworks material TAPP-TFPB-COF was synthesized by using 1, 2, 4, 5-Tetrakis-(4-formylphenyl) benzene (TFPB) and 5,10,15,20- Tetra(p-amino-phenyl) porphyrin (TAPP) as monomers via Schiff base reaction. The macroscopic structure is a two-dimensional layered structure assembled and stacked in layers to form a three-dimensional structure with a micrometer size. Its pore size is 1.20 nm with a regular pore structure and its specific surface area is 1107.3 m2g− 1. It has good adsorption capacity for the model dye RhB at room temperature. In addition, TAPP-TFPB-COF could continue to degrade RhB by photocatalysis under visible light irradiation after saturation of RhB adsorption. The material had good stability and reusability. It is able to achieve continuous removal of RhB under dark and light conditions.