BiPO4/Ov-BiOBr High-Low Junctions for Efficient Visible Light Photocatalytic Performance for Tetracycline Degradation and H2O2 Production

Through a two-step solvothermal method, different molar ratios of BiPO4 were grown in situ on the surface oxygen-vacancy-rich BiOBr (Ov-BiOBr), successfully constructing BiPO4/Ov-BiOBr heterojunction composite material. By novel type I high-low junction between semiconductor and Ov-BiOBr, stronger oxidative holes or reductive electrons retained, thereby improving redox performance photocatalyst. The catalyst with 10% content demonstrated highest degradation rate tetracycline (TC), degrading over 95% within 90 min, constant 0.02534 min−1, which is 2.3 times that Ov-BiOBr 22 BiPO4. sample displayed best photocatalytic activity, producing 139 μmol·L−1 H2O2 120 3.6 efficiency 19 This was due to appropriate bandgap matching photo-generated electron transfer channel via Bi-bridge, efficient charge separation. It inferred free radical species ·OH ·O2− played dominant role process. Based experimental theoretical results, possible mechanism proposed.