ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 63, (3) 291 - 296 (2019)


LOW TEMPERATURE PHOSPHORIC ACID TREATMENT OF ZINC OXIDE FOR NOBEL WHITE PIGMENTS
 
Onoda Hiroaki, Higashide Daiki
 
Department of Informatics and Environmental Sciences, Kyoto Prefectural University, 1-5, Shimogamo Nakaragi-cyo, Sakyo-ku, Kyoto 606-8522, Japan

Keywords: Zinc oxide, Photocatalytic activity, Powder processing
 

Zinc 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 phosphoric acid to synthesize a white pigment for cosmetics. Zinc oxide was set with 0.1 mol/L of phosphoric acid at P/Zn = 1/1 and 1/2, and then shaking in water at 30, 40, 50°C for 1, 3, 6 hours. The chemical composition, powder properties, photocatalytic activity, color phase, and smoothness of the obtained powder were studied. The P/Zn ratio in preparation had influence on the reaction between phosphoric acid and zinc oxide. The photocatalytic activity of zinc oxide was inhibited by phosphoric acid treatment. The treated samples at 50°C had enough high reflectance at the visible light region.


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doi: 10.13168/cs.2019.0023
 
 
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