Photocatalytic degradation of ammonium dinitramide over novel S-scheme g-C3N4/BiOBr heterostructure nanosheets

Photocatalytic remediation of explosive wastewater pollution gradually attracts our attention owing to strict environmental protection requirements. In this study, visible light driven photocatalytic degradation of ammonium dinitramide (ADN) over the novel solvothermal-synthesized 2D/2D g-C3N4(CN)/BiOBr(BB) heterostructure nanosheets was carried out. Multiple characterization techniques confirm the successful formation of tight contact interface between BiOBr and CN nanosheets. 30CN/BB composite exhibits the superior photocatalytic activity with degradation efficiency of 95.0 %, attributing to larger effective electrochemical surface area (ECSA), expanded light capture range and efficient S-scheme charge transfer ability. Besides, the main active species were determined as e− and •O2−, and generation level of free radicals was detected by EPR technique. Moreover, the reactive sites and possible degradation mechanism of ADN were analyzed by DFT calculation.