Synthesis of surface sulfated BiWO with enhanced photocatalytic performance
| Autor: | Zhencheng Xu, Yongming Ju, Zhenxing Wang, Xiaohang Fang, Xiuyu Zhang, Jianming Hong, Dongyang Wei, Sang Yanhong, Jiande Fang |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Photolysis
Environmental Engineering Chromatography Ultraviolet Rays Butanol General Medicine Crystal structure Sulfuric Acid Esters Photochemistry Catalysis chemistry.chemical_compound chemistry Rosaniline Dyes Photocatalysis Environmental Chemistry Degradation (geology) Environmental Pollutants Irradiation Malachite green Bismuth General Environmental Science Visible spectrum |
| Zdroj: | Journal of Environmental Sciences. 24:2180-2190 |
| ISSN: | 1001-0742 |
| DOI: | 10.1016/s1001-0742(11)61061-9 |
| Popis: | Sulfated BiWO (SBiWO) was synthesized by an impregnation method to enhance the visible-light-driven photoactivities of BiWO (BiWO). The characterization results verified that sulfate anion mainly anchored on the catalyst surface greatly extended the visible-light-responsive range without destroying the crystal lattice. Moreover, the SBiWO-based photoactivities were evaluated with the removal of Malachite Green (MG) under UV-Vis irradiation emitted from two microwave-powered electrodeless discharge lamps (MPEDL −2 ) and under visible light (λ > 420 nm). The results demonstrated that the kinetic constant was increased 2.25 times, varying from 0.1478 (BiWO) to 0.3328 min −1 (SBiWO-1). Similar results were also obtained for the visible light-driven reaction. Furthermore, radical scavengers such as t -butanol restricted the visible-light induced degradation of MG over BiWO and SBiWO-1. This indicated that the sulfating process increased the generation of reactive oxygen species, which was further verified by molecular probe with salicylic acid. Thus, more blue-shifting at λ = 618 nm was observed over SBiWO. On the basis of the above results, the photocatalytic mechanism over the sulfated catalyst was also discussed. |
| Databáze: | OpenAIRE |
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