Abstract
Ultrafine systems of zinc oxide and cerium oxide for use as ultraviolet filter were synthesized by a non-alkoxide sol–gel process at different temperatures, to obtain solid materials (40 and 70 °C), that were characterized by X-ray diffraction, scanning electron microscopy, UV–vis reflectance. Their catalytic and photocatalytic activities were also evaluated. ZnO:CeO 2 systems present higher UV absorption and transparency in the visible region. The photocatalytic activity of ZnO:CeO 2 systems for the oxidation of organic materials is much smaller than that of titania, ceria and zinc oxide, suggesting that ZnO:CeO 2 systems are promising candidates for use as optical materials in UV-filters.
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