Facile Fabrication of Novel S-scheme AgPO/g-CN/Zeolite Photocatalyst for Boosting Photocatalytic Tetracycline Degradation and Hydrogen Production.

This study presents a novel ternary AgPO/g-CN/zeolite composite for photocatalytic H production and TC degradation through S-scheme electron transport. The S-scheme AgPO/g-CN heterojunction was successfully constructed on zeolite surface through calcination and precipitation processes. The results indicated that AgPO/g-CN/zeolite-50 % presented dramatically enhanced photocatalytic TC degradation performance, and the TC degradation efficiency was up to 92.86 % in 180 min under visible light. The corresponding reaction rate constant was 0.01205 min which was 2.18 and 7.48 times greater than those of pure AgPO (0.00554 min) and g-CN (0.00161 min), respectively. Meanwhile, the highest H production rate (2748.6 μmol g h) was achieved over AgPO/g-CN/zeolite-50 % under simulated solar light which was around 26.5 and 5.6 times higher than that of g-CN and AgPO, respectively. The enhanced photocatalytic activity of the ternary composite was mainly due to the synergistic effect of S-scheme AgPO/g-CN heterojunction and zeolite support which endowed the composite with excellent adsorption activity, enhanced light response ability, and efficient separation of photoinduced carriers. TC degradation mechanism and pathways were proposed based on quenching experiment and HPLC-MS results. Overall, this study proposes a promising strategy for significantly improving photocatalytic activity and applying in photocatalytic pollutant degradation and hydrogen production.