| Abstract A series of Bi, S-codoped TiO2 nanoparticles with different Bi(S)/Ti molar ratios were synthesized by a sol-gel method. The effects of Bi, S content on the morphology, textural properties, photo absorption and photocatalytic activity of TiO2 nanoparticles were investigated. SEM, TEM, XRD, FT-Ranman, UV-vis, and XPS observations of the obtained samples revealed the formation of anatase TiO2 nanopaticles doped with Bi and S, which existed as Bi2O3 and SO42-, respectively. The doping of Bi and S could decrease the diameter of TiO2 nanoparticles. Bi-doped TiO2 samples showed an extension of light absorption into the visible region, which mainly originated from the doping process with the formation of new energy level of Bi ion. The addition of S could improve photocatalytic activities by increasing the acidic sites of the catalyst. The co-doping Bi and S strongly affected photocatalytic performance of TiO2 nanoparticles. Under the same conditions, the TiO2 nanoparticles doped with Bi and S exhibited a higher photocatalytic activity for H2 evolution from glycerol/water mixtures than the bare TiO2 nanoparticles. TiO2 nanoparticles doped with 3% Bi and S had a maximum H2 production rate of 1 514.9 and 190.2 μmol/(h·g) under UV and solar light irradiation, respectively. |
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2014, Vol. 31 
