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Scientific Publications

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Abstract

In the purpose of preparation of purification elements at low cost in our daily life, thin layers of undoped and magnesium doped zinc oxide were deposited on ceramic pellets constituted of cristobalite, mullite and zircon. These substrates are made from abundant local raw materials. The thin films are prepared by dip-coating. The effects of the magnesium doping on the physical and photocatalytic properties have been studied using several techniques such as X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy and UV-visible spectrophotometry. The photocatalytic effectiveness was tested on an aqueous solution of Orange II under UV light. The results obtained show that only porous substrate, consisting essentially of mullite and zircon, gives an important photocatalytic activity. This important effect can be related to the high rate of open porosity in these substrates (due to the consumption of the SiO2 vitreous phase by zirconia). The presence of the open porosity, able to be filled with ZnO:Mg, makes the specific surface larger and improves the photocatalytic effect.

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