Photocatalytic Degradation of Dyes Using TiO_2-supported Diatomite

摘要

TiO_2/Diatomite composite photocatalysts with different TiO_2 content were prepared by sol-gel technology. Their structures were characterized by XRD and FTIR analysis, and their photocatalytic performance was examined by decolorizing of two dyes and one real textile wastewater. The influencing factors on the photocatalytic performance were also discussed under different dye concentrations and pH values. The results showed that the optimum preparation process is that the content of TiO_2 in the composite photocatalysts is 37.5% and the calcined condition is at 500°C for 1 hour. Moreover, the dye removal of 200mg/L Rhodamine B by the TiO_2-supported diatomite was about 76.9%, and the COD (Chemical Oxygen Demand) removal of one textile wastewater was 60.9%. This composite catalyst exhibited high photocatalytic activity for the removal of dyes selected as model pollutant in aqueous solution.