腐殖质及其模型化合物的H<sub>2</sub>O<sub>2</sub>光化学生成研究

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Abstract The present study systematically investigated H₂O₂ generation kinetics and potential mechanism from irradiated humic substances (HS) and their model compounds under simulated sunlight. Our results indicated that all the selected HS with different sources or forms can produce H₂O₂ under irradiation, and no significant difference was observed between them, with the generation rate ranging from 6.379 to 15.784nmol/(L·min). The H₂O₂ generation rate from humic acid (HA) was slightly faster than that from fulvic acid (FA). In the case of humus model compounds, 7compounds including veratryl alcohol, p-aminobenzoic acid, 3,5-dihydroxybenzoic acid (DHBA), 2,5-dihydroxy-1,4-benzoquinone, phenol, benzoic acid and aniline could produce detectable H₂O₂, while other compounds including catechol, resorcinol, hydroquinone, quinone, o-anisidine, p-anisidine, salicylic acid and 2,6-dimethoxy-1,4-benzoquinone can't. Nevertheless, the H₂O₂ generation rate from the model compounds varies from each other, with one or two orders of magnitude. Among them, 2,5-dihydroxyl-1,4-benquione and DHBA exhibited the highest H₂O₂ yields, while phenol, benzoic and p-aminobenzoic acid showed a relative low H₂O₂ generation potential. Based on the generation mechanism of H₂O₂ from HS, a possible H₂O₂ formation mechanism from a typical model compound, i.e. DHBA, was proposed. DHBA was believed to excite to a singlet state, after an intramolecular electron transfer process, giving a reducing intermediate. The intermediate could further react with O₂ to form O₂·^- and subsequently generate H₂O₂.

Key words： hydrogen peroxide humic substances humus model compounds photoproduction water

Received: 30 June 2020

PACS:	X52
	X131.2

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	Articles by authors
	LI Jian-hua
	ZHANG Ya
	WU Xin-an
	WANG Meng-jie
	SHI Qin-ren
	PENG Jian-biao
	GAO Shi-xiang

Cite this article:

LI Jian-hua,ZHANG Ya,WU Xin-an等. Hydrogen peroxide photoproduction by humic substances and their model compounds[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(12): 5337-5342.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I12/5337

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