Preparation of ZnO/g-C3N4 heterojunction photocatalytic material and its degradation of pyridine
The ZnO/g-C3N4 heterojunction photocatalytic materials were prepared by evaporation solvent-high temperature thermal polymerization method.They were systematically characterized by XRD,FTIR,TEM,XPS,UV-vis DRS,PL,TPC and EIS.The activity and stability of ZnO/g-C3N4 photocatalytic degradation of pyridine were evaluated.The effects of differ-ent factors on the photocatalytic performance were investigated by L9(34)orthogonal experiment,and the photocatalytic mechanism was discussed.XPS and TEM results proved the formation of heterojunction between ZnO and g-C3N4.The forma-tion of heterojunction effectively promoted the separation of photoelectron-holes,improved the light absorption and broad-ened the spectral range.Under the conditions of ZnO/g-C3N4 composite photocatalyst dosage of 50 mg,ZnO/g-C3N4 mass ra-tio of 1∶2,pyridine initial concentration of 20 mg/L and system pH of 7.0,the photocatalytic degradation rate of pyridine by ZnO/g-C3N4 reached 98.9%after visible light irradiation for 60 min,and the photocatalytic degradation rate was 97.3%af-ter 5 cycles,which had good stability.The photocatalytic degradation of pyridine by ZnO/g-C3N4 was mainly dependent on the action of superoxide radicals(·O2-)and holes(h+).
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