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Visible light enabled v and cr doped titania-silica aerogel photocatalyst

Hamdan, Halimaton and Mohd Muhid, Mohd Nazlan and Lee, Siew Ling and Tan, Yin Yin (2009) Visible light enabled v and cr doped titania-silica aerogel photocatalyst. International Journal of Chemical Reactor Engineering, 7 . ISSN 1542-6580

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Abstract

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).

Item Type:Article
Uncontrolled Keywords:chromium, nanostructured photocatalyst, silica-titania aerogel, vanadium, visible-light response
Subjects:Q Science > QD Chemistry
Divisions:Science
ID Code:13187
Deposited By: Liza Porijo
Deposited On:22 Jul 2011 02:02
Last Modified:22 Jul 2011 02:03

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