Degradation of acetic acid with sulfate radical generated by persulfate ions photolysis

被引：336

作者：

Criquet, Justine ^{[1
]}

Leitner, Nathalie Karpel Vel ^{[1
]}

机构：

[1] Univ Poitiers, Ecole Super Ingn Poitiers, CNRS, Lab Chim & Microbiol Eau,UMR 6008, F-86022 Poitiers, France

来源：

CHEMOSPHERE | 2009年 / 77卷 / 02期

关键词：

Sulfate radical; Mineralization; Carboxylic acids; Persulfate; Photolysis; ELECTRON-SPIN RESONANCE; LASER FLASH-PHOTOLYSIS; AQUEOUS-SOLUTION; RATE CONSTANTS; PHOTOCHEMICAL DECOMPOSITION; POTASSIUM PEROXODISULFATE; HYDROXYL RADICALS; CHLORINE ATOMS; PH-DEPENDENCE; OXIDATION;

D O I：

10.1016/j.chemosphere.2009.07.040

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The photolysis of S2O82- was studied for the removal of acetic acid in aqueous solution and compared with the H2O2/UV system. The SO4-center dot radicals generated from the UV irradiation of S2O82- ions yield a greater mineralization of acetic acid than the (OH)-O-center dot radicals. Acetic acid is oxidized by SO4-center dot radicals without significant formation of intermediate by-products. Increasing system pH results in the formation of (OH)-O-center dot radicals from SO4-center dot radicals. Maximum acetic acid degradation occurred at pH 5. The results suggest that above this pH, competitive reactions with the carbon mineralized inhibit the reaction of the solute with SO4-center dot and also (OH)-O-center dot radicals. Scavenging effects of two naturally occurring ions were tested; in contrast to HCO3- ions, the presence of Cl- ions enhances the efficiency of the S2O82-/UV process towards the acetate removal. It is attributed to the formation of the Cl-center dot radical and its great reactivity towards acetate. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：194 / 200

页数：7

共 47 条

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