TANFeng-xun,CHENYong-kai,WANGRong,et al.Performance and Mechanism of g-C3N4/PDS for Photocatalytic Degradation of Atrazine[J].China Water & Wastewater,2023,39(1):91-98.
Performance and Mechanism of g-C3N4/PDS for Photocatalytic Degradation of Atrazine
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第1期
Page:
91-98
Column:
Date of publication:
2023-01-01
- Keywords:
- graphite phase carbon nitride (g-C3N4); peroxysulphate (PDS); atrazine(ATZ); photocatalysis; synergistic effect
- Abstract:
- To solve the problem of water pollution caused by atrazine (ATZ), graphite phase carbon nitride (g-C3N4) was successfully prepared by thermal polymerization with melamine as the precursor, and its structure and morphology were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, the performance of g-C3N4 coupled with peroxysulphate (PDS) system for ATZ degradation under visible light was investigated. The kinetic results confirmed that g-C3N4 and PDS had an obvious synergistic effect under visible light, and its degradation performance of ATZ was significantly better than that of g-C3N4/Vis, PDS/Vis and g-C3N4/PMS/Vis systems. The optimization experiment indicated that the degradation of ATZ could be effectively promoted by moderately increasing the concentration of PDS and the dosage of g-C3N4 and reducing pH of the solution. However, the presence of Cl-, CO32-/HCO3-, NO3- and natural organic matter (NOM) inhibited the degradation to different degrees. The results of radical quenching experiment and electron paramagnetic resonance (EPR) showed that h+, ·OH, SO4.- and O2.-in the system were the main active species leading to the degradation of ATZ. On this basis, the enhancement mechanism of ATZ degradation in g-C3N4/PDS/Vis system was proposed. The possible degradation pathways of ATZ were deduced based on the intermediate products determined by liquid chromatography-mass spectrometry (LC-MS/MS).
Last Update:
2023-01-01