Nanoporous hydrogenated TiO2 photocatalysts generated by underwater discharge plasma treatment for solar photocatalytic applications
| Autor: | Ha-Rim An, Jin Young Huh, Hyun Uk Lee, Young Boo Lee, Yong Cheol Hong, Hyeran Kim, So Young Park, Young-Chul Lee |
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| Rok vydání: | 2017 |
| Předmět: |
Anatase
Materials science Nanotechnology 02 engineering and technology 010402 general chemistry medicine.disease_cause 01 natural sciences Catalysis chemistry.chemical_compound Crystallinity medicine Rhodamine B Irradiation General Environmental Science Brookite Nanoporous Process Chemistry and Technology 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Chemical engineering visual_art Photocatalysis visual_art.visual_art_medium 0210 nano-technology Ultraviolet |
| Zdroj: | Applied Catalysis B: Environmental. 211:126-136 |
| ISSN: | 0926-3373 |
| DOI: | 10.1016/j.apcatb.2017.04.027 |
| Popis: | In this paper, we report on the mass production, characteristics and application of a hydrogenated TiO 2 photocatalyst (H-TiO 2 ) with high reactivity under solar light irradiation. The H-TiO 2 photocatalyst has been prepared by simple sol-gel method/underwater discharge plasma treatment at room temperature and atmospheric pressure. The optical absorption spectrum of TiO 2 can be extended from the ultraviolet (UV) into the visible range by changing the surface properties. The crystallinity, hydrogenation and porosity of TiO 2 can be greatly enhanced within 90 s through underwater discharge plasma, using amorphous TiO 2 (as-synthesized TiO 2 , a-TiO 2 ) as the precursor. The resultant H-TiO 2 showed high bicrystalline (anatase/brookite phases) and a large surface area (267.5 m 2 /g), thus improving photocatalytic activity. We have demonstrated that H-TiO 2 showed significant photocatalytic efficiencies for degradation of reactive black 5, rhodamine B, and phenol under solar light irradiation, up to 10 times higher than those of commercial TiO 2 and a-TiO 2 , leading to complete water purification. Interestingly, the H-TiO 2 photocatalyst also exhibited strong antimicrobial activities against Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus under solar light irradiation, up to 5-times greater than those of commercial TiO 2 and a-TiO 2 . Given that H-TiO 2 can be mass produced and easily processed by underwater discharge plasma, we expect this plasma technology may find important environmental and medical applications. |
| Databáze: | OpenAIRE |
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