Sol-Gel Synthesis of Fe2O3-Doped TiO2 for Optimized Photocatalytic Degradation of 2,4- Dichlorophenoxyacetic Acid

摘要

Fe2O3-doped and undoped TiO2 catalysts were synthesized by sol-gel method and used to optimize the photocatalytic degradation of 2,4-Dichlorophenoxyacetic acid (2,4-D). The catalysts produced were dominated by the tetragonal, crystalline anatase TiO2 cell structure. The 0.05wt% Fe2O3-doped TiO2 catalyst exhibited higher photocatalytic activity than that of undoped TiO2 but its performance decline with increase Fe2O3 content due to possible increase of recombination centers. Photocatalytic degradation of 2,4-DA was optimized by response surface methodology. The highest 2,4-DA degradation (48%) was obtained when 1.0 g of 0.05wt% Fe2O3-doped TiO2 is used to degrade 10 ppm of 2,4-DA at pH 4.