UV和UV/H<sub>2</sub>O<sub>2</sub>工艺对水中二嗪磷的降解

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Abstract

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.

Key words： diazinon ultraviolet H₂O₂ degradation kinetics intermediates degradation pathway

Received: 29 September 2018

PACS:	X703.1
	TU991.27

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	Articles by authors
	LIU Yu-can
	SU Miao-miao
	DONG Jin-kun
	ZHANG Yan
	DUAN Jin-ming
	LI Wei

Cite this article:

LIU Yu-can,SU Miao-miao,DONG Jin-kun等. Degradation rule and mechanisms of diazinon in water by sole UV and UV/H₂O₂ process[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(4): 1602-1610.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I4/1602

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