title: Synthesis, characterization, and visible-light-driven photocatalytic performance of W-SBA15.
abstract: A series of tungsten-containing mesoporous SBA15 with different tungsten contents were prepared through a direct co-condensation sol-gel method and then analyzed by various techniques. XRD patterns revealed that the original mesoporous morphology was maintained after introducing tungsten species and forms of tungsten species were changed from incorporated tungsten to isolated tungsten species or low oligomeric tungsten oxide species, and finally to crystalline WO3 with the increase of tungsten precursor content, which were also proven by HRTEM images, UV-Vis DRS, and FT-IR spectra. The W-SBA15 samples exhibited satisfactory photocatalytic performance toward degradation of dye Rhodamine B (RhB) and 2,4-dichlorophenol (2,4-DCP). In particular, the best candidate, sample 10%W-SBA15 showed an apparent reaction rate constant for RhB that was nearly 10 times as high as that of bulk WO3. The enhancement of photocatalytic capability was attributed to the mesoporous morphology with enlarged surface areas, negatively charged surface, and favorable tungsten forms such as incorporated tungsten, isolated tungsten or low oligomeric tungsten oxide species. In addition, active radicals trapping experiments and DMPO spin-trapping ESR spectra indicated that photogenerated holes were major oxidative species during photocatalysis.
authors: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, PR China. Electronic address: feichang@usst.edu.cn.
authors: Fei
authors: F
authors: Chang
authors: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, PR China.
authors: Jie
authors: J
authors: Wang
authors: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, PR China.
authors: Jieru
authors: J
authors: Luo
authors: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, PR China.
authors: Junrong
authors: J
authors: Sun
authors: Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong 264003, PR China. Electronic address: xfhu@yic.ac.cn.
authors: Xuefeng
authors: X
authors: Hu
keywords: 2,4-Dichlorophenol; Mechanism; Photocatalysis; Rhodamine B; W-SBA15