Preparation Of Coated TiO₂ Films And Solar Photocatalytic Degradation Of Dyeing-Wastewater

In 21 century, the energy sources and environmental problems will be the great task we meeting. So efficient using of solar light not only solves the problem of exhausted energy sources but also eases up the global environmental polluted problems caused by CO₂ and NO_x TiO₂ photocatalyst can eventually lead to mineralization of the organic pollution into H₂O and CO₂ by transforming solar energy to chemical energy. Solar photocatalytic degradation is a kind of environmental friendly technology of wastewater treatment.Basing on the present situation of dyeing water pollution, we studied the preparation of coated TiO₂ films, designed a solar photocatalytic degradation reactor of dyeing-wastewater and used solar photocatalysis degrading some representative dyeing-wastewaters.In this study, we prepared the TiO₂ sol-gel by using tetrabutyl titanium as precursor. The Tio₂ films were immobilized on the glass springs' surface by dip-coating method. The structure and surface morphology of Tio₂ films were investigated by means of DSC-TG XRD, UV-VIS SEM and AFM. Using solar photocatalytic degradation reactor, we degraded two representative dyes. The results showed as follows:1. The storage stability of the TiO₂ sol-gel is perfect. TiO₂ sol-gel can be used to prepare coated TiO₂ films.2. The TiO₂ films are lubricous, uniform and transparent. The particle size is approximately 50nm in diameter and coated TiO₂ film thickness is approximately 300nm.3. Dead-weight capacity of TiO₂ photocatalysts is 3.34 mg/g and abrasion rate of TiO₂ films is 0.16%.