Study on US/O3 mechanism in p-chlorophenol decomposition.
Study on the effects of sonolysis, ozonolysis and US/O3 system on the decomposition of p-chlorophenol in aqueous solutions indicated that in the cases of US/O3 system, individual ozonolysis and sonolysis, the decomposition rate of p-chlorophenol reached 78.78%, 56.20%, 2.79% after a 16-min reaction while its CODcr (chemical oxygen demand) removal rate was 97.02%, 62.17%, 3.67% after a 120-min reaction. The decomposition reaction of p-chlorophenol follows pseudo-first-order kinetics. The enhancement factors of p-chlorophenol and its COD(cr) under US/O3 system reached 63% and 237% respectively. The main intermediates during the decomposition include catechol, hydroquinone, p-benzoquinone, phenol, fumaric acid, maleic acid, oxalic acid and formic acid. The decomposition mechanism of p-chlorophenol was also discussed.
Xu
Xian-wen
XW
Department of Environmental Science and Engineering, Zhejiang University, Hangzhou 310027, China. xxw118@zju.edu.cn
Xu
Xin-hua
XH
Shi
Hui-xiang
HX
Wang
Da-hui
DH
D002733:Chlorophenols / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects*; D003198:Computer Simulation; D007220:Industrial Waste / Q000517:prevention & control; D007700:Kinetics; D008956:Models, Chemical; D010126:Ozone / Q000737:chemistry*; D012996:Solutions; D013010:Sonication; D014867:Water / Q000032:analysis / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D002733:Chlorophenols; D007220:Industrial Waste; D012996:Solutions; D014867:Water; C029107:4-chlorophenol; D010126:Ozone