Inorganic Chemicals Industry >
Preparation of ZnO/g-C3N4 heterojunction photocatalytic material and its degradation of pyridine
Received date: 2023-11-06
Online published: 2024-04-18
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 different 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 formation of heterojunction effectively promoted the separation of photoelectron-holes，improved the light absorption and broadened the spectral range.Under the conditions of ZnO/g-C3N4 composite photocatalyst dosage of 50 mg，ZnO/g-C3N4 mass ratio 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% after 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+）.
Key words： ZnO/g-C3N4; photocatalysis; heterojunction; pyridine
TANG Bei . Preparation of ZnO/g-C3N4 heterojunction photocatalytic material and its degradation of pyridine[J]. Inorganic Chemicals Industry, 2024 , 56(4) : 133 -142 . DOI: 10.19964/j.issn.1006-4990.2023-0527
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