Highly concentrated toluene decomposition on the dielectric barrier discharge (DBD) plasma–photocatalytic hybrid system with Mn-Ti-incorporated mesoporous silicate photocatalyst (Mn-Ti-MPS)
This study investigates the Mn-Ti-incorporated mesoporous silicate (Mn-Ti-MPS) as a photocatalyst for highly concentrated toluene removal in a plasma-photocatalytic hybrid system. Various Mn-Ti-MPS [Ti/Si molar ratio = 1/4, Mn/Ti molar ratio = 0.01/1 (1 mol%), 0.05/1 (5 mol%) and 0.1/1 (10 mol%)] ph...
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Veröffentlicht in: | Applied surface science 2006-11, Vol.253 (2), p.535-542 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | This study investigates the Mn-Ti-incorporated mesoporous silicate (Mn-Ti-MPS) as a photocatalyst for highly concentrated toluene removal in a plasma-photocatalytic hybrid system. Various Mn-Ti-MPS [Ti/Si molar ratio = 1/4, Mn/Ti molar ratio = 0.01/1 (1 mol%), 0.05/1 (5 mol%) and 0.1/1 (10 mol%)] photocatalysts were successfully synthesized using a common hydrothermal method without causing any structural damage. In the X-ray diffraction (XRD) pattern, the main peaks of the TiO2 anatase structure and MnO did not show. All samples displayed hexagonal specific peaks at 2.5 deg (d110 plane), 4.1 deg (d110 plane) and 4.7 deg (d2 00 plane). This indicates that the Ti ions and Mn ions were well substituted into the Si ion sites in the framework of MCM-41. Their surface areas decreased compared with that of pure MCM-41, while the hexagonal straight pore size was distributed in a range of 2.5-3.5 nm. In the Mn-Ti-MPS, much more water and toluene molecules were absorbed compared to the Ti-MPS. From the X-ray photoelectron spectroscopy (XPS) result, it was determined that the hydrophilicity of the Mn-Ti-MPS was stronger than that of the Ti-MPS. Photocatalytic decomposition for highly concentrated toluene of 1000 ppm increased in the Mn-Ti-MPS when compared with the Ti-MPS, while toluene decomposition on 5 mol% Mn-Ti-MPS was remarkably enhanced to 80% in the plasma system. The conversion to CO2, however, did not improve in the case of the plasma-only system. Nonetheless, in the plasma-photocatalytic hybrid system, the conversion to CO2 for 5 mol% Mn-Ti-MPS reached 43% (in an 800 ppm toluene conversion). |
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ISSN: | 0169-4332 |
DOI: | 10.1016/j.apsusc.2005.12.103 |