Degradation Of Phenol By Nano-TiO₂/zeolite/UV Catalyzed Ozonation In Aqueous Solution

Nowadays the mostly used alternative of nitrobeneze treatment that based on TiO₂/zeolite catalyst is photocatalytic. This paper is employing ozone together with UV and in particular with a supported catalyst TiO₂/zeolite that can degradate nitrobeneze completely.The oxidation capacity and the photodegradation rate is far better than photocatalytic only. The nanoparticle TiO₂/zeolite catalyst which was suitable for pratical project use was prepared by the sol-gel process.TiO₂/zeolite catalyst was easy to control the crystal.From the experimental results obtained it is observed that there had no effect to removed nitrobeneze by only use oxygen or catalyst adsorption.Different experimental conditions in degradating nitrobeneze by O₃/TiO₂/zeolite/UV system have been examined,it was showed that with the increase in air flow and temperture,the degradation rate of nitrobeneze will accelerate.Catalytic ozoation reaction was first order with no respect to the initial concentration of nitrobeneze.PH is an important influencing factor which effected the ozone oxidation process,the best effect was received uder alkalescent condition.Tert-butyl alcohol on the degradation of nitrobeneze have a strong inhibitory effct. TiO₂/zeolite catalyst was deactivation after ten times using,and it can be renewable by high temperature roasting.From investigating various systems degradation of TOC,it is abtained that individual ozone on removing TOC had no effect , there had large number of intermediate products in the reaction system.The photocatalytic combined with ozone can capture the photo-induced electron-e- in the photocatalytic process,generating more strong oxidizer·OH, so O₃/TiO₂/zeolite/UV system on the effect of removing TOC was best.By analyzing the affcting factors on the degradation system of nitrobeneze,it was conculed that some experimental parameters, such as pH value, catalyst dosage and temperature effect strongly the reaction.