Title: The pathway of the ozonation of 2,4,6-trichlorophenol in aqueous solution
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 H_2O_2, Cl~-, formic acid and oxalic acid were studied during the ozonation process. The results showed that when there was no scavenger, the removal efficiency of (0.1?mmol·L~(-1)) 2,4,6-TCP could reach 99% within 6 min by adding (24?mg·L~(-1)) ozone. The reaction of molecular ozone with 2,4,6-TCP resulted in the formation of H_2O_2. The maximal concentration of H_2O_2 detected during the ozonation could reach 22.5% of the original concentration of 2,4,6-TCP. The reaction of ozone with H_2O_2 resulted in generating a lot of OH· radicals. Therefore, 2,4,6-TCP was destroyed to formic acid and oxalic acid by ozone and OH· radicals together. With the inhibition of OH· radicals, ozone molecule firstly destroyed 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 O_3/OH· are proposed.
Publication Year: 2005
Publication Date: 2005-01-01
Language: en
Type: article
Access and Citation
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot