[Degradation of trace nitrobenzene in aqueous solution by ozone with catalysis of nanosized TiO2 supported on haydite].
This paper presented the results of catalytic degradation of nitrobenzene by ozone in the presence of nanosized TiO2 supported on haydite, and evaluated influencing factors and the pathway of degradation. Catalysts were prepared by sol-sel method, and sintered in electrical resistance furnace. The optimum sinter temperature was found for preparing the catalyst. The SEM was also used to characterize the catalyst. When the catalyst was sintered at 700 degrees C, it had the best property of catalysis. The catalytic ozonation of nitrobenzene was first order reaction with respect to the concentration of nitrobenzene, and OH* was the dominating species in the oxidation process. As the dose of catalyst increased, the removing rate of nitrobenzene also increased. The highest ozonation rate of this compound, which is 46.5%, was found when pH value was approximately 10. Besides, the catalyst showed good ability after 3 times repeated uses.
Zhang
Jing
J
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. zjing428@163.com
Ma
Jun
J
Yang
Yi-xin
YX
Wang
Sheng-jun
SJ
Qin
Qing-dong
QD
D002384:Catalysis; D053768:Metal Nanoparticles / Q000737:chemistry; D009578:Nitrobenzenes / Q000737:chemistry* / Q000302:isolation & purification; D010126:Ozone / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*
D009578:Nitrobenzenes; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D010126:Ozone; D014025:Titanium; C036077:nitrobenzene