Photocatalytic degradation of azo dyes using nanometer-sized TiO2 photocatalyst immobilized on activated carbon
负载型纳米TiO2/AC对偶氮染料的光催化降解研究

Using tetrabutyl titanate and granular activated carbon as the raw material, nanometer-sized TiO_ 2 photocatalyst immobilized on activated carbon(TiO_ 2/AC)was prepared by sol-gel-dip method. The photocatalytic degradation of 2 azo dyes orange G and reactive brilliant red X-3B in simulated wastewater were studied in a fluidized photocatalytic reactor. The influences of pH value, additive oxidants to the photocatalyic degradation rate were investigated. The recovered efficiency and catalytic activity of the regenerated photocatalyst was also tested. The results indicated that TiO_ 2/AC photocatalyst showed high photocatalytic activity, absorbability and regeneratjng property. The photocatalytic degradation rates of orange G and reactive brilliant red X-3B were achieved 99.71% and 97.12% in 60mins, the TOC removal rates were achieved 81.54% and 81.99% after 180mins reaction respectively. The recovery rate of TiO_ 2/AC photocatalyst was more than 95%, and the photocatalytic degradation rates of orange G was achieved 95.93% by calcination regenerated TiO_ 2/AC especially.