Preparation of Novel Mesoporous Photocatalyst Bi4O5Br2/SBA-15 with Enhanced Visible-Light Catalytic Activity
| Autor: | Kaijie Dong, Youju Shu, Jiwei Chen, Shengrong Yan |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Langmuir Materials science 010402 general chemistry 01 natural sciences 0104 chemical sciences Catalysis chemistry.chemical_compound Adsorption Chemical engineering chemistry 0103 physical sciences Rhodamine B Photocatalysis Absorption (electromagnetic radiation) Mesoporous material Visible spectrum |
| Zdroj: | Open Journal of Applied Sciences. :532-544 |
| ISSN: | 2165-3925 2165-3917 |
| DOI: | 10.4236/ojapps.2018.811043 |
| Popis: | Photocatalysis is one of the most promising methods owing to its great potential to relieve environmental issue. To construct efficient photocatalyst with low energy consumption, mild catalytic conditions, and stable chemical properties are highly desired. In this work, a novel, highly active and environmental friendly mesoporous photocatalyst Bi4O5Br2/SBA-15 was synthesized by hydrothermal method, and its characteristics and visible-light catalytic activity were investigated. The synthesized photocatalyst consisted of Langmuir type IV hysteresis loops, which was confirmed to be a composite material with mesoporous structure. It exhibited a high visible-light absorption intensity and a low recombination rate of photo-generated electrons and holes. When the mass ratio of Bi/SiO2 was 30/100 during the synthesis, the obtained photocatalyst (Bi30/SBA-15) reflected the fastest Rhodamine B (RhB) removal rate and achieved 100% decolorization of RhB by both adsorption and degradation process. This high decolorization efficiency can also be maintained and realized by recycling the used composite in practice. The enhanced visible-light photocatalytic activity of novel Bi4O5Br2/SBA-15 photocatalyst can be ascribed to the existing active sites both inside and outside SBA-15 which enhanced the separation of photo-generated electrons and holes. |
| Databáze: | OpenAIRE |
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