Advanced oxidation degradation of dichlorobenzene in water by the UV/H2O2 process.
Through UV/H2O2 photocatalytic advanced oxidation technique the performance, kinetics, pathway, and mechanism of ortho-dichlorobenzene (O-DCB) in water and the effect parameters of degradating reaction were studied systematically. The results showed that the reaction of photocatalytic degradation of O-DCB was fast and accorded well with the pseudo-first-order kinetics. The roles of some parameters, such as the pH, the initial concentrations of O-DCB, H2O2, and some anions in reaction solution, were examined in detail. It was found that weak acidic or neutral environment was favorable to the degradation reaction and some anions slowed down the photocatalytic degradation rate. Input amount of H2O2 possessed the best value under specified condition. The intermediates of O-DCB degradation were also tentatively identified 2,3-dichlorophenol, 3,4-dichlorophenol, formic acid, acetic acid, and oxalic acid mainly adopting GC/MS and ion chromatogram (IC) techniques. According to this, the pathway and mechanism of UV/H2O2 photocatalytic degradation of O-DCB were deduced and led.
Xu
Tao
T
State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, PR China. xutao@gig.ac.cn
Xiao
Xian-Ming
XM
Liu
Hong-Ying
HY
D002722:Chlorobenzenes / Q000737:chemistry / Q000302:isolation & purification* / Q000528:radiation effects; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D010777:Photochemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification* / Q000528:radiation effects; D018508:Water Purification / Q000379:methods
D002722:Chlorobenzenes; D014874:Water Pollutants, Chemical; C004726:2-dichlorobenzene; D006861:Hydrogen Peroxide