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

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