A series of high surface area (~700 m2/g) nanostructured coupled semiconductor photocatalysts (NCSP) based on transition metals (M = Cr, V) doped titania-silica aerogel of various molar ratios of Ti:Si (1:25, 1:33 and 1:50) were synthesized via direct synthesis and wet impregnation methods. All samples reveal well-dispersed TiO2 with three different types of Ti coordination namely isolated Ti, non-isolated Ti and octahedrally coordinated Ti species. Cr and V (5 wt%)-titania silica aerogel under visible light irradiation reduced the bandgap energy of T25 to 2.9 eV. The photocatalytic activity of NCSP is 3 fold more active than photocatalyst supported on amorphous silica. Cr (5 wt%)-titania silica aerogel photocatalyst gives the highest conversion of styrene under both UV and visible light irradiation (55% and 47% respectively).
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Visible Light Enabled V and Cr Doped Titania-Silica Aerogel Photocatalyst
1Universiti Teknologi Malaysia, hali@kimia.fs.utm.my
2Universiti Teknologi Malaysia, nazlan@kimia.fs.utm.my
3Universiti Teknologi Malaysia, lee@kimia.fs.utm.my
4Universiti Teknologi Malaysia, yin.tan@intel.com
Citation Information: International Journal of Chemical Reactor Engineering. Volume 7, Issue 1, Pages –, ISSN (Online) 1542-6580, DOI: 10.2202/1542-6580.1985, November 2009
Publication History:
- Published Online:
- 2009-11-05
Keywords: nanostructured photocatalyst; silica-titania aerogel; vanadium; chromium; visible-light response
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