Surface Modification of TiO2 for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene
| Autor: | Hong Kwan Cho, Young Dok Kim, Hyun Ook Seo, Byeong Jun Cha, Shahid Saqlain, Tae Gyun Woo, Jee Yong Kim, Sang-Wook Han |
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| Rok vydání: | 2018 |
| Předmět: |
Inorganic chemistry
02 engineering and technology lcsh:Chemical technology 010402 general chemistry 01 natural sciences Catalysis Dimethylacetamide lcsh:Chemistry chemistry.chemical_compound toluene lcsh:TP1-1185 Physical and Theoretical Chemistry Polydimethylsiloxane technology industry and agriculture 021001 nanoscience & nanotechnology Toluene surface deactivation 0104 chemical sciences Titanium oxide lcsh:QD1-999 chemistry Photocatalysis Surface modification 0210 nano-technology TiO2 photocatalysis Volatility (chemistry) |
| Zdroj: | Catalysts Volume 8 Issue 11 Catalysts, Vol 8, Iss 11, p 500 (2018) |
| ISSN: | 2073-4344 |
| DOI: | 10.3390/catal8110500 |
| Popis: | Titanium oxide (TiO2) nanostructures, the most widely used photocatalysts, are known to suffer from poisoning of the active sites during photocatalytic decomposition of volatile organic compounds. Partially oxidized organic compounds with low volatility stick to the catalyst surface, limiting the practical application for air purification. In this work, we studied the UV-driven photocatalytic activity of bare TiO2 toward toluene decomposition under various conditions and found that surface deactivation is pronounced either under dry conditions or humid conditions with a very high toluene concentration (~442 ppm). In contrast, when the humidity was relatively high (~34 %RH) and toluene concentration was low (~66 ppm), such deactivation was not significant. We then modified TiO2 surfaces by deposition of polydimethylsiloxane and subsequent annealing, which yielded a more hydrophilic surface. We provide experimental evidence that our hydrophilic TiO2 does not show deactivation under the conditions that induce significant deactivation with bare TiO2. Conversion of toluene into dimethylacetamide was observed on the hydrophilic TiO2 and did not result in poisoning of active sites. Our hydrophilic TiO2 shows high potential for application in air purification for extended time, which is not possible using bare TiO2 due to the significant poisoning of active sites. |
| Databáze: | OpenAIRE |
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