Effect of water-matrix composition on Trimethoprim solar photodegradation kinetics and pathways

被引：173

作者：

Sirtori, Carla ^{[1
,2
,3
]}

Agueera, Ana ^{[1
]}

Gernjak, Wolfgang ^{[2
,4
]}

Malato, Sixto ^{[2
]}

机构：

[1] Univ Almeria, Pesticide Residue Res Grp, La Canada De San Urbano 04120, Almeria, Spain

[2] CIEMAT, Plataforma Solar Almeria, Tabernas 04200, Almeria, Spain

[3] Minist Educ Brazil, Capes Fdn, BR-70359970 Brasilia, DF, Brazil

[4] Univ Queensland, AWMC, Brisbane, Qld 4072, Australia

来源：

WATER RESEARCH | 2010年 / 44卷 / 09期

关键词：

Trimethoprim; Direct photolysis; Solar TiO2 photocatalysis; LC-TOF-MS; Photoproducts; DISRUPTING CHEMICALS EDCS; CARE PRODUCTS PPCPS; AQUATIC ENVIRONMENT; TREATMENT PLANTS; ANTIBIOTICS; PHARMACEUTICALS; OXIDATION; REMOVAL; DEGRADATION; OZONATION;

D O I：

10.1016/j.watres.2010.02.006

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Direct photolysis and solar TiO2 photocatalysis of Trimethoprim (TMP) in different water matrices (demineralised and simulated seawater) have been studied. Direct photolysis yielded a similar, slow TMP degradation rate in both water matrices, and the formation of very stable photo-transformation products. Dissolved organic carbon decreased slightly after prolonged irradiation. The main intermediate identified was a ketone derivative (trimethoxybenzoylpyrimidine), which was proved to be a photosensitizer of TMP degradation. During TiO2 photocatalysis, TMP was completely eliminated in both water matrices at a similar rate, however, the mineralization rate was appreciably reduced in seawater, which can be explained by the presence of inorganic species acting as hydroxyl radical scavengers, and directly affecting photocatalytic efficiency. Identification of intermediates showed differences between the two processes but hydroxylation, demethylation and cleavage of the original drug molecule were observed in both. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：2735 / 2744

页数：10

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