Abstract

MAHMOUD, M.A.; PONCHERI, A.; BADR, Y.  and  ABD EL WAHED, M.G.. Photocatalytic degradation of methyl red dye. S. Afr. j. sci. [online]. 2009, vol.105, n.7-8, pp.299-303. ISSN 1996-7489.

Silica nanoparticles (SiO₂ NPs) are active in the photocatalytic degradation of methyl red dye (MR). SiO₂ NPs and SiO₂ NPs that have been doped with either silver (Ag NPs) and/or gold nanoparticles (Au NPs) were prepared. The particle size and morphology of the catalysts were assessed by transmission electron microscopy (TEM) imaging. The rate of photocatalytic degradation of MR was found to increase from SiO₂ NPs, SiO₂ NPs coated with both Au NPs and Ag NPs, SiO₂ NPs coated with Ag NPs, SiO₂ NPs coated with Au NPs, Ag⁺-doped SiO_{2 N}Ps to Au³⁺-doped SiO₂ NPs.

Keywords : silica nanoparticles; photocatalysis; photodegradation; gold; silver.

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