Enhancing the piezocatalytic performance of C3N5 through boron/oxygen doping for effective degradation of chlortetracycline

Utilizing sustainable energy in the environment to treat pollutants is an important research direction in the field of modern environmental governance. In this paper, a series of B-C3N5-O piezoelectric materials were prepared that have excellent piezoelectric properties. The test results of the quasi-static d33 measuring instrument showed that the piezoelectric coefficient of B-C3N5-O-2 is 1.429 times that of C3N5. Under ultrasound conditions, the removal rate of chlortetracycline by B-C3N5-O-2 after 80 min was 91.2 %, 4.48 times that of C3N5. The electron paramagnetic resonance test results showed that hydroxyl radicals and superoxide radicals played an important role in chlortetracycline degradation. The density functional theory calculation results showed that boron/oxygen doping reduces the band gap to 2.041 eV, thereby promoting electron migration in the material. In addition, possible degradation mechanisms and pathways were proposed. This work provided an effective method for treating organic pollutants in water and had broad application prospects.