Parameters affecting sulfonamide photo-Fenton degradation - Iron complexation and substituent group

被引：82

作者：

Batista, Ana Paula S. ^{[1
]}

Pupo Nogueira, Raquel F. ^{[1
]}

机构：

[1] UNESP Univ Estadual Paulista, Inst Quim Araraquara, BR-14801970 Araraquara, SP, Brazil

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2012年 / 232卷

基金：

巴西圣保罗研究基金会;

关键词：

Fe(III)-oxalate; Sulfonamide; Substituent effect; Photo-Fenton; TREATMENT PLANTS; PHOTODEGRADATION; ANTIMICROBIALS; FERRIOXALATE; ANTIBIOTICS; OXIDATION; RADICALS; BEHAVIOR; WATERS; ROLES;

D O I：

10.1016/j.jphotochem.2012.01.016

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

The photo-Fenton degradation of the sulfonamide antibiotics sulfadiazine (SDZ) and sulfathiazole (STZ) mediated by Fe(III)-oxalate was studied in this work. The influence of iron complexation. H2O2 concentration and pH on the initial SDZ and STZ degradation rate was evaluated. Degradation of both antibiotics is drastically improved in the presence of Fe(III)-oxalate in comparison to free iron, achieving complete degradation after 8 min irradiation at pH 2.5 in the presence of 5 mM H2O2 (equivalent to H2O2/antibiotic = 50). It was also possible to extend pH range of the photo-Fenton reaction by the use of Fe(III)-oxalate reaching more the 70% degradation at pH 6, however without significant mineralization. Comparison of the degradation kinetics of both sulfonamides indicated higher recalcitrance of STZ due to the lower electron density of its thiazol ring in relation to pyrimidine ring in SDZ. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：8 / 13

页数：6

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