Pathway of the ozonation of 2,4,6-trichlorophenol in aqueous solution |
| |
Authors: | Yunzheng Pi Jianlong Wang |
| |
Affiliation: | 1. Laboratory of Environmental Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, China
|
| |
Abstract: | 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 H2O2. The maximal concentration of H2O2 detected during the ozonation could reach 22.5% of the original concentration of 2,4,6-TCP. The reaction of ozone with H2O2 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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|