Biomimetic porphyrin-modified 3D porous composite material adsorption enhances photocatalytic CO2 reduction and tetracycline oxidative degradation

Facing energy waste caused by carbon emissions and environmental pollution brought by the overuse of antibiotics, this work successfully synthesized a series of biomimetic porphyrin-modified three-dimensional (3D) porous composites as catalysts and used photocatalysis to recycle CO2 greenhouse gas and degrade tetracycline (TC) into harmless small molecules. The integration of adsorption and catalysis is an important way to achieve efficient photocatalysis. A prepared composite material (x-TA/C-ZCF) featured a porous structure, high content of pyridine nitrogen, and modified surface amino groups with strong adsorption capacity for CO2, as well as excellent light absorption performance derived from the incorporation of the TCPP porphyrin component. This material showed outstanding pollutant adsorption and degradation capacity for the photocatalytic reduction of CO2 and degradation of TC. Notably, 1-TA/C-ZCF catalyst achieved high yields of CO (392.23 μmol g−1) and CH4 (34.55 μmol g−1) and excellent TC adsorption degradation effect. In terms of practical application, the sponge monolithic material is designed to facilitate recycling and reuse, and showed excellent reusability and stability. This work, combined with the design of dual degradation functional monolithic catalysts with the advantages of adsorption and catalysis, will provide valuable reference for the preparation of efficient photocatalysts for resource and environmental applications.