Sol–gel synthesis of highly TiO2 aerogel photocatalyst via high temperature supercritical drying

Nanocrystalline powders of TiO2 xerogel and aerogel were prepared by using acid-modified sol–gel approach. For TiO2 aerogel material (TA), the solvent was high temperature supercritically extracted at 300 °C and 100 bars. However, the TiO2 xerogel material (TX) was dried at 200 °C and ambient pressu...

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Main Authors:	Rebah Moussaoui, Kais Elghniji, Mongi ben Mosbah, Elimame Elaloui, Younes Moussaoui
Format:	Article
Language:	English
Published:	Elsevier 2017-09-01
Series:	Journal of Saudi Chemical Society
Online Access:	http://www.sciencedirect.com/science/article/pii/S1319610317300443

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record_format	Article
spelling	doaj-021248e7bfe2456891253d827e2ea5e32020-11-25T00:26:07ZengElsevierJournal of Saudi Chemical Society1319-61032017-09-01216751760Sol–gel synthesis of highly TiO2 aerogel photocatalyst via high temperature supercritical dryingRebah Moussaoui0Kais Elghniji1Mongi ben Mosbah2Elimame Elaloui3Younes Moussaoui4Material Environment and Energy Laboratory (UR14ES26), Faculty of Sciences of Gafsa, University of Gafsa, TunisiaMaterial Environment and Energy Laboratory (UR14ES26), Faculty of Sciences of Gafsa, University of Gafsa, Tunisia; Faculty of Sciences of Gafsa, University of Gafsa, 2112 Gafsa, TunisiaMaterial Environment and Energy Laboratory (UR14ES26), Faculty of Sciences of Gafsa, University of Gafsa, Tunisia; Faculty of Sciences of Gafsa, University of Gafsa, 2112 Gafsa, TunisiaMaterial Environment and Energy Laboratory (UR14ES26), Faculty of Sciences of Gafsa, University of Gafsa, Tunisia; Faculty of Sciences of Gafsa, University of Gafsa, 2112 Gafsa, TunisiaFaculty of Sciences of Gafsa, University of Gafsa, 2112 Gafsa, Tunisia; Organic Chemistry Laboratory (LR17ES08), Faculty of Sciences of Sfax, University of Sfax, Tunisia; Corresponding author at: Faculty of Sciences of Gafsa, University of Gafsa, 2112 Gafsa, Tunisia. Fax: +216 76210423.Nanocrystalline powders of TiO2 xerogel and aerogel were prepared by using acid-modified sol–gel approach. For TiO2 aerogel material (TA), the solvent was high temperature supercritically extracted at 300 °C and 100 bars. However, the TiO2 xerogel material (TX) was dried at 200 °C and ambient pressure. The effects of the drying processes on the crystalline structure, phase transformation and grain growth were determined by Raman spectroscopy, SAED and X-ray diffraction (XRD) analyses using Rietveld refinement method. The TiO2 aerogel was composed of anatase crystalline structure. The TiO2 xerogel material was composed of anatase, brookite and small amount of amorphous phase with anatase as dominant phase. The TX sample still contains a relatively high concentration of carbon than that of TA, indicating the amorphous character of TiO2 xerogel. These materials were applied as catalyst for the degradation of indigo carmine in aqueous medium. Photo-degradation ability of TA and TX was compared to the TiO2 commercial Degussa P25. The photo-catalytic results showed that the degradation efficiency was in the order TA > P25 > TX. The photo-degradation of indigo carmine followed pseudo first order reaction kinetics. Keywords: Sol–gel, Xerogel, Aerogel, Supercritical drying, Photodegradationhttp://www.sciencedirect.com/science/article/pii/S1319610317300443
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Rebah Moussaoui Kais Elghniji Mongi ben Mosbah Elimame Elaloui Younes Moussaoui
spellingShingle	Rebah Moussaoui Kais Elghniji Mongi ben Mosbah Elimame Elaloui Younes Moussaoui Sol–gel synthesis of highly TiO2 aerogel photocatalyst via high temperature supercritical drying Journal of Saudi Chemical Society
author_facet	Rebah Moussaoui Kais Elghniji Mongi ben Mosbah Elimame Elaloui Younes Moussaoui
author_sort	Rebah Moussaoui
title	Sol–gel synthesis of highly TiO2 aerogel photocatalyst via high temperature supercritical drying
title_short	Sol–gel synthesis of highly TiO2 aerogel photocatalyst via high temperature supercritical drying
title_full	Sol–gel synthesis of highly TiO2 aerogel photocatalyst via high temperature supercritical drying
title_fullStr	Sol–gel synthesis of highly TiO2 aerogel photocatalyst via high temperature supercritical drying
title_full_unstemmed	Sol–gel synthesis of highly TiO2 aerogel photocatalyst via high temperature supercritical drying
title_sort	sol–gel synthesis of highly tio2 aerogel photocatalyst via high temperature supercritical drying
publisher	Elsevier
series	Journal of Saudi Chemical Society
issn	1319-6103
publishDate	2017-09-01
description	Nanocrystalline powders of TiO2 xerogel and aerogel were prepared by using acid-modified sol–gel approach. For TiO2 aerogel material (TA), the solvent was high temperature supercritically extracted at 300 °C and 100 bars. However, the TiO2 xerogel material (TX) was dried at 200 °C and ambient pressure. The effects of the drying processes on the crystalline structure, phase transformation and grain growth were determined by Raman spectroscopy, SAED and X-ray diffraction (XRD) analyses using Rietveld refinement method. The TiO2 aerogel was composed of anatase crystalline structure. The TiO2 xerogel material was composed of anatase, brookite and small amount of amorphous phase with anatase as dominant phase. The TX sample still contains a relatively high concentration of carbon than that of TA, indicating the amorphous character of TiO2 xerogel. These materials were applied as catalyst for the degradation of indigo carmine in aqueous medium. Photo-degradation ability of TA and TX was compared to the TiO2 commercial Degussa P25. The photo-catalytic results showed that the degradation efficiency was in the order TA > P25 > TX. The photo-degradation of indigo carmine followed pseudo first order reaction kinetics. Keywords: Sol–gel, Xerogel, Aerogel, Supercritical drying, Photodegradation
url	http://www.sciencedirect.com/science/article/pii/S1319610317300443
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Sol–gel synthesis of highly TiO2 aerogel photocatalyst via high temperature supercritical drying

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