[Study on the mechanism of ozonation of organic combination with UV radiation].
Nitrobenzene, glycolic acid and acetic acid were selected to be degraded by O3/UV. During the degradation of nitrobenzene by O3/ UV, addition of MnO2, an effective catalyst to decompose H2O2 in water, decreased the degradation efficiency obviously, and the degradation efficiency of O3 /UV was even lower than that of ozonation alone, for example, the TOC removal rates of nitrobenzene by O3 /UV, O3 and O3/UV + MnO2 were 44% , 41% and 39% in 40 minutes, respectively. These results demonstrate that intermediate H2O2 plays an important role in enhancement of degradation efficiency of O3/UV. Furthermore, the characteristic of organic, which acts as promoter or inhibitor in the process of ozonation, also affects the degradation efficiency of O3/UV directly, when glycolic acid, a promoter in ozonation, was degraded, the combination UV radiation with ozonation could remove it efficiency, the removal rate of glycolic acid reached 76% in 30 minutes; however, when acetic acid, an inhibitor in ozonation, was degraded by O3/UV, the removal rate of acetic acid was very low, which was similar with that of ozonation alone.
Tong
Shao-Ping
SP
College of Chemical Engineering and Materials Science, State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032, China. sptong@zjut.edu.cn
Wang
Zi
Z
Ma
Chun-An
CA
D019342:Acetic Acid / Q000032:analysis / Q000737:chemistry; D006016:Glycolates / Q000032:analysis / Q000737:chemistry; D009578:Nitrobenzenes / Q000032:analysis / Q000737:chemistry*; D010084:Oxidation-Reduction / Q000528:radiation effects; D010126:Ozone / Q000737:chemistry*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D014881:Water Supply / Q000032:analysis
D006016:Glycolates; D009578:Nitrobenzenes; D014874:Water Pollutants, Chemical; C031149:glycolic acid; D010126:Ozone; C036077:nitrobenzene; D019342:Acetic Acid