Degradation rule and mechanisms of diazinon in water by sole UV and UV/H2O2 process
LIU Yu-can1, SU Miao-miao1, DONG Jin-kun1, ZHANG Yan1, DUAN Jin-ming2, LI Wei2
1. School of Civil Engineering, Yantai University, Yantai 264005, China;
2. School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
The degradation kinetics, intermediates formation and degradation pathway of diazinon at different dosages of H2O2 under ultraviolet (UV) irradiation (253.7nm) was investigated. The results showed that H2O2 significantly affected on the photo-degradation rate of diazinon in UV irradiation treatment processes. The rate was lower under sole UV treatment (the pseudo-first-order rate constant (k) was 0.0234min-1) than UV/H2O2 treatment with H2O2 dose of 5 and 10mg/L (k=0.0301min-1 and k=0.0341min-1, respectively). More than 94% of diazinon was degraded within 120 min of UV irradiation during sole UV and UV/H2O2 treatment processes. In addition, dissolved organic carbon (DOC) in diazinon aqueous solution decreased with the dosage of H2O2 increased from 0 to 10mg/L under the UV irradiation treatment. However, the removal efficiency of DOC was relatively low, which was less than 20% within 120 min of UV irradiation during all treatment conditions in this study. The degradation intermediates of diazinon varied significantly under different H2O2 dosages. Eight major species of degradation intermediates were detected after 60 minutes of sole UV irradiation, while only six species were detected after 60 minutes of the UV/H2O2 oxidation treatment. A systematic qualitative and semiquantitative analyses of the intermediates of diazinon under different H2O2 dosages were conducted, the degradation pathways of diazinon during the sole UV and UV/H2O2 treatment processes were discussed as well.
刘玉灿, 苏苗苗, 董金坤, 张岩, 段晋明, 李伟. UV和UV/H2O2工艺对水中二嗪磷的降解[J]. 中国环境科学, 2019, 39(4): 1602-1610.
LIU Yu-can, SU Miao-miao, DONG Jin-kun, ZHANG Yan, DUAN Jin-ming, LI Wei. Degradation rule and mechanisms of diazinon in water by sole UV and UV/H2O2 process. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(4): 1602-1610.
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