Enhancing the photoactivity of TiO2/SiO2 monolithic catalyst and its reusability for wastewater treatment
| Autor: | Thao Vy Nguyen, Kieu Duyen Vo, Minh-Vien Le, Ngoc Diem Trinh Huynh |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
geography
Anatase Materials science geography.geographical_feature_category 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis law.invention chemistry.chemical_compound chemistry law lcsh:TA1-2040 Photocatalysis Calcination Monolith 0210 nano-technology Photodegradation lcsh:Engineering (General). Civil engineering (General) Methylene blue Nuclear chemistry Visible spectrum |
| Zdroj: | MATEC Web of Conferences, Vol 268, p 07005 (2019) |
| Popis: | A series of TiO2/SiO2 photocatalysts were successfully synthesized by the sol-gel method. The TiO2/SiO2 monolith was also synthesized by dip-coating process. The crystalline structure of TiO2/SiO2 powders was identified as pure anatase. The photocatalytic activity of the TiO2/SiO2 powders was evaluated by photodegradation of 20 ppm methylene blue (MB) using a 26W lamp which has the wavelength in the visible light region under different Ti: Si molar ratios and calcination temperatures. The TiO2/SiO2 powders which have Ti: Si molar ratio of 85:15 (TS15) and calcined at 550tC showed the highest photodegradation yield of 84 % after 3h irradiation. Furthermore, the 550˚C calcined TS15 monolith performed the MB degradation yield of 88.9 % after 3h irradiation and its photoactivity still remained after 4 recycle times. The results of this study demonstrated that the TS15 monolith photocatalyst has a reasonable efficiency in the degradation of methylene blue, it could be a promising photocatalyst for removal and degradation of organic pollutants. |
| Databáze: | OpenAIRE |
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