Pathway of the ozonation of 2,4,6-trichlorophenol in aqueous solution

被引：7

作者：

Pi Y. ^{[1
]}

Wang J. ^{[1
]}

机构：

[1] Laboratory of Environmental Technology, Institute of Nuclear and New Energy Technology, Tsinghua University

来源：

Frontiers of Environmental Science & Engineering in China | 2007年 / 1卷 / 2期

基金：

中国国家自然科学基金; 俄罗斯科学基金会;

关键词：

2,4,6-trichlorophenol; Hydrogen peroxide; Hydroxyl radicals; Ozone; Reaction pathway;

D O I：

10.1007/s11783-007-0031-3

中图分类号：

学科分类号：

摘要：

The reaction mechanism and pathway of the ozonation of 2,4,6- trichlorophenol (2,4,6-TCP) in aqueous solution were investigated. The removal efficiency and the variation of H2O2, Cl- formic acid, and oxalic acid were studied during the semi-batch ozonation experiments (continuous for ozone gas supply, fixed volume of water sample). The results showed that when there was no scavenger, the removal efficiency of 0.1 mmol/L 2,4,6-TCP could reach 99% within 6 min by adding 24 mg/L ozone. The reaction of molecular ozone with 2,4,6-TCP resulted in the formation of H 2O2. The maximal concentration of H2O 2 detected during the ozonation could reach 22.5% of the original concentration of 2,4,6-TCP. The reaction of ozone with H2O 2 resulted in the generation of a lot of OH• radicals. Therefore, 2,4,6-TCP was degraded to formic acid and oxalic acid by ozone and OH• radicals together. With the inhibition of OH• radicals, ozone molecule firstly degraded 2,4,6-TCP to form chlorinated quinone, which was subsequently oxidized to formic acid and oxalic acid. Two reaction pathways of the degradation of 2,4,6-TCP by ozone and O3/OH• were proposed in this study. © Higher Education Press 2007.

引用

页码：179 / 183

页数：4

共 16 条

[11]

Benitez F.J., Beltran-Heredia J., Acero J.L., Rubio F.J., Contribution of free radicals to chlorophenols decomposition by several advanced oxidation processes, Chemosphere, 41, pp. 1271-1277, (2000)

[12]

Hirvonen A., Trapido M., Hentunen J., Tarhanen J., Formation of hydroxylated and dimeric intermediates during oxidation of chlorinated phenols in aqueous solution, Chemosphere, 41, 8, pp. 1211-1218, (2000)

[13]

Pi Y.Z., Ernst M., Schrotter J., Effect of phosphate buffer upon CuO/Al <sub>2</sub>O<sub>3</sub> and Cu (II) catalyzed ozonation of oxalic acid solution, Ozone Sci Eng, 25, 5, pp. 393-397, (2003)

[14]

Bader H., Sturzenegger V., Hoigne J., Photometric method for the determination of low concentrations of hydrogen peroxide by the peroxidase catalyzed oxidation of N,N-Diethyl-p-Phenylenediamine (DPD), Water Res, 22, 9, pp. 1109-1115, (1988)

[15]

Staehelin J., Hoigne J., Decomposition of ozone in water in the presence of organic solutes acting as promoters and inhibitors of radical chain reactions, Environ Sci Technol, 19, 12, pp. 1206-1213, (1985)

[16]

Hoigne J., Inter-calibration of OH radical sources and water quality parameters, Water Sci Technol, 35, 4, pp. 1-8, (1997)

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