| dc.creator |
Kim, You Na |
|
| dc.creator |
Shao, Godlisten N. |
|
| dc.creator |
Jeon, Sunjeong |
|
| dc.creator |
Imran, S.M |
|
| dc.creator |
Sarawade, PB |
|
| dc.creator |
Kim, HT |
|
| dc.date |
2016-05-18T06:08:56Z |
|
| dc.date |
2016-05-18T06:08:56Z |
|
| dc.date |
2013-07-26 |
|
| dc.date.accessioned |
2018-04-18T12:07:59Z |
|
| dc.date.available |
2018-04-18T12:07:59Z |
|
| dc.identifier |
http://hdl.handle.net/20.500.11810/2127 |
|
| dc.identifier.uri |
http://hdl.handle.net/20.500.11810/2127 |
|
| dc.description |
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. |
|
| dc.language |
en_US |
|
| dc.publisher |
Chemical Engineering Journal |
|
| dc.subject |
TiO2-SiO2 aerogel |
|
| dc.subject |
sol-gel process |
|
| dc.subject |
TiOCl2 |
|
| dc.subject |
Ambient pressure drying |
|
| dc.subject |
Sodium silicate |
|
| dc.subject |
Photocatalysis |
|
| dc.title |
Sol–gel synthesis of sodium silicate and titanium oxychloride based TiO2–SiO2 aerogels and their photocatalytic property under UV irradiation |
|
| dc.type |
Journal Article, Peer Reviewed |
|