Research Of Photocatalytic Degradation Of Phenol Wastewater With Nano-TiO₂

Photocatalytic degradation of organic contaminant is a promising technology of wastewater treatment. In this field, TiO₂ is used as photocatalyst extensively for its high photoactivity, none secondary pollution caused and the potential utilization of solar energy.The thesis was focused on treating the Phenol with the nano-TiO₂ photocatalyst in the simulated wastewater. The influencing factors were studied including different light sources , initial concentration of Phenol, pH of solution and the amount of nano-TiO₂ added .The comparison of degradation effect was made between the P25 TiO₂ and self-preparation TiO₂ catalyst. Reused effect of self-preparation TiO₂ catalyst was studied. The synergistic effect was concerned to TiO₂ with other materials. The elementary kinetics discipline was discussed in photocatalysis of Phenol and the pathway of degradation of the Phenol was predicted.Results indicated that: Photodegradation efficiency of Phenol is 35.8% in TiO₂- Phenol suspended system in 4 hr under the following conditions: Phenol concentration 100mg/L with 1.5g/L of P-25TiO₂ at pH=4 and with 16W ultra-violet sterilization lamp. The degradation rate decreased with the increase of initial concentration of Phenol. The research indicated that the self-preparation nano-TiO₂ exhibited high photocatalytic action under ultraviolet radiation. It also showed some photocatalytic effect under nature light source and in the dark. The nano-TiO₂ could be reusable by activation which helped it to become a widely used green environmental photocatalyst. The degradation rate of Phenol can be higher to 56% when 30%H₂O₂ was added into the TiO₂ /UV suspended system. The degradation rate of Phenol can be higher than 90% in 15 minutes when Fenton reagent was added. The effective degradation was achieved by the synergistic effect of TiO₂/UV and H₂O₂ or Fenton agent. But the synergism is not evident between TiO₂ /UV and active carbon granule. Photocatalytic oxidation combines with other proper technology is regarded as a future advanced oxidation technology in environmental protection.