Preparation and Photocatalytic Activity of Ag Modified Ti-Doped-Bi2O3 Photocatalyst
Ti doped Bi2O3 (TDB) and Ag ion modified Ti doped Bi2O3 (Ag@TDB) photocatalysts were prepared by framework replacement synthesis method with different Ag loadings (0.05, 0.3, 0.75, and 1.0 mol/L AgNO3).The structural properties ofthe prepared catalysts were studied by scanning electron microscope (SEM), X-ray diffraction (XRD), BET surface area, and UV/ViS diffuse reflectance (DRS).The XRD spectra of the Ti doped Bi2O3 calcined at 650 ℃ show the diffraction peaks of a mixture of Bil2TiO20 and Bi4Ti3O12,with bits of mixed crystallite consisting of TiO2 and B2O3.A high blue shift in the range 650-550 nm was detected in the DRS band.This blue shift increased with decreasing Ag content.The photocatalytic activities of the catalysts were evaluated for the degradation of crystal violet (CV) under UV light irradiation.The results indicated that the degradation rate of 1.0 mol/L AgNO3 doped bismuth titanate composite photocatalyst (1.0 Ag@TDB) was 1.9 times higher than that of the bare Ti doped Bi2O3 photocatalyst.The higher activity of Ag@TDB is due to the enhancement of electron-hole separation by the electron trapping of silver particles.
Photocatalysis Silver ion doping Bismuth Titanate composite Crystal Violet UV light
Lilan Zhang Junfeng Niu Yueping Bao
State Key Laboratory of Water Environment Simulation,School of Environment,Beijing Normal University,Beijing 100875,P.R.China
国际会议
浙江嘉兴
英文
51-55
2013-10-24（万方平台首次上网日期，不代表论文的发表时间）