Abstract
ABSTRACTZinc oxide that has the photocatalytic activity is used as white pigment for cosmetics. A certain degree of sebum on the skin is decomposed by the ultraviolet radiation in sunlight. In this work, zinc oxide was shaken with 0.1, 0.2, and 0.5 mol/L of phosphoric acid at 50ºC for 3 hours to synthesize a white pigment for cosmetics. Zinc oxide was also set with 0.1 mol/L of phosphoric acid at pH 4, 5, 6, and 7, and then shaking. The chemical composition, powder properties, photocatalytic activity, color phase, and smoothness of the obtained powder were studied. The pH value in preparation had influence on the reaction between zinc oxide and phosphoric acid. The photocatalytic activity of zinc oxide was inhibited by phosphoric acid treatment. The obtained samples had enough high reflectance at the visible light region.
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