Sol–gel synthesis of sodium silicate and titanium oxychloride based TiO2–SiO2 aerogels and their photocatalytic property under UV irradiation
| dc.contributor.author | Kim, You Na | |
| dc.contributor.author | Shao, Godlisten N. | |
| dc.contributor.author | Jeon, Sunjeong | |
| dc.contributor.author | Imran, S.M | |
| dc.contributor.author | Sarawade, PB | |
| dc.contributor.author | Kim, HT | |
| dc.date.accessioned | 2016-05-18T06:08:56Z | |
| dc.date.available | 2016-05-18T06:08:56Z | |
| dc.date.issued | 2013-07-26 | |
| dc.description.abstract | Binary titania–silica metal oxides (TiO2–SiO2) have preferentially been used as photocatalysts for the degradation of organic contaminants under UV irradiation. Herein we synthesized TiO2–SiO2 aerogel powders with different Si-to-Ti ratios suitable for decolorization of organic pollutants using less expensive silica source (sodium silicate) and titanium oxychloride as a titania precursor. Consequently, the surfaces of the alcogels were hydrophobized using trimethylchlorosilane (TMCS) as a silylating agent to yield hydrophobic aerogel powders at ambient pressure drying. The as-prepared samples were calcined at different temperatures ranging from 200 to 1000 C to evaluate the effect of the heat treatment in the microstructure of the aerogels. The physico-chemical properties of the aerogels were examined by XRD, FTIR, XRF, TEM, SEM, N2 gas physisorption studies, TGA/DTA and diffusive reflectance spectrometry analyses. It was found that calcination temperature is an important factor in improving the porosity and crystallinity of the aerogels however; it has a detrimental effect on the hydrophobicity and photochemical performance of the aerogels. The as-synthesized aerogels were hydrophobic and exhibited the highest activity toward decolorization of methylene blue. The hydrophilic aerogels were obtained after calcination at temperature P500 C however; the formed samples possessed lower activities. Hydroxyl radicals ( OH) detection experiment performed in the presence of the photocatalysts indicated that the generation of radicals during irradiation increases with increasing illumination time. | en_US |
| dc.identifier.uri | http://hdl.handle.net/20.500.11810/2127 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Chemical Engineering Journal | en_US |
| dc.subject | TiO2-SiO2 aerogel | en_US |
| dc.subject | sol-gel process | en_US |
| dc.subject | TiOCl2 | en_US |
| dc.subject | Ambient pressure drying | en_US |
| dc.subject | Sodium silicate | en_US |
| dc.subject | Photocatalysis | en_US |
| dc.title | Sol–gel synthesis of sodium silicate and titanium oxychloride based TiO2–SiO2 aerogels and their photocatalytic property under UV irradiation | en_US |
| dc.type | Journal Article, Peer Reviewed | en_US |