Performance and mechanism of photocatalytic tetracycline degradation by Bi2WO6/MIL-101in water
The Bi2WO6/MIL-101composite photocatalysts were synthesized via a hydrothermal method to facilitate the degradation of tetracycline(TC)under visible light.Research findings demonstrated that the TC degradation efficiency of Bi2WO6 under visible light was significantly enhanced following the dense growth of BWO nanosheets on the surface of MIL-101.Furthermore,the structurally optimized BWO/MIL-101-40exhibited a TC degradation efficiency of 85.9％within 60minutes,with a reaction rate constant approximately 1.4 times that of Bi2WO6 and 3.1times that of MIL-101.Additionally,BWO/MIL-101 displayed consistent and robust photocatalytic performance in neutral and alkaline conditions.Band structure analysis revealed the formation of type Ⅱ heterojunctions between Bi2WO6 and MIL-101,contributing to effective photoelectron-hole separation.Quenching experiments and electron paramagnetic resonance(EPR)tests indicated superoxide radical(·O2-)and holes(h+)as the primary active species in this particular photocatalytic system.
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