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EXPERIMENTAL AND THEORETICAL INSIGHTS INTO PHOTOCHEMICAL TRANSFORMATION KINETICS AND MECHANISMS OF AQUEOUS PROPYLPARABEN AND RISK ASSESSMENT OF ITS DEGRADATION PRODUCTS
An, TC; Fang, HS; Li, GY; Wang, SL; Yao, SD; antc99@gig.ac.cn
2014
Source PublicationENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
ISSN0730-7268
Volume33Issue:8Pages:1809—1816
AbstractThe kinetics and mechanisms of ultraviolet photochemical transformation of propylparaben (PPB) were studied. Specific kinetics scavenging experiments coupled with quantum yield determinations were used to distinguish the roles of various reactive species induced by self-sensitized and direct photolysis reactions, and the excited triplet state of PPB ((PPB)-P-3*) was identified as the most important species to initiate the photochemical degradation of PPB in aquatic environments. The computational results of time-resolved absorption spectra proved that (PPB)-P-3* is a highly reactive electron acceptor, and a head-to-tail hydrogen transfer mechanism probably occurs through electron coupled with proton transfer. Physical quenching by, or chemical reaction of (PPB)-P-3* with, O-2 was confirmed as a key step affecting the initial PPB transformation pathways and degradation mechanisms. The transformation products were identified and the toxicity evolutions of PPB solutions during photochemical degradation under aerobic and anaerobic conditions were compared. The results indicate that anaerobic conditions are more likely than aerobic conditions to lead to the elimination and detoxification of PPB but less likely to lead to PPB mineralization. (C) 2014 SETAC
KeywordPolycyclic Aromatic-hydrocarbons Photocatalytic Degradation Excited-states Parabens Photodegradation Photolysis Oxidation Phenols Tio2 Irradiation
Indexed BySCI
Language英语
WOS IDWOS:000340536900019
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/14131
Collection中科院上海应用物理研究所2011-2019年
Corresponding Authorantc99@gig.ac.cn
Recommended Citation
GB/T 7714
An, TC,Fang, HS,Li, GY,et al. EXPERIMENTAL AND THEORETICAL INSIGHTS INTO PHOTOCHEMICAL TRANSFORMATION KINETICS AND MECHANISMS OF AQUEOUS PROPYLPARABEN AND RISK ASSESSMENT OF ITS DEGRADATION PRODUCTS[J]. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY,2014,33(8):1809—1816.
APA An, TC,Fang, HS,Li, GY,Wang, SL,Yao, SD,&antc99@gig.ac.cn.(2014).EXPERIMENTAL AND THEORETICAL INSIGHTS INTO PHOTOCHEMICAL TRANSFORMATION KINETICS AND MECHANISMS OF AQUEOUS PROPYLPARABEN AND RISK ASSESSMENT OF ITS DEGRADATION PRODUCTS.ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY,33(8),1809—1816.
MLA An, TC,et al."EXPERIMENTAL AND THEORETICAL INSIGHTS INTO PHOTOCHEMICAL TRANSFORMATION KINETICS AND MECHANISMS OF AQUEOUS PROPYLPARABEN AND RISK ASSESSMENT OF ITS DEGRADATION PRODUCTS".ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 33.8(2014):1809—1816.
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