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Journal of Ceramic Science and Technology

The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of  the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.

The Journal is published by Göller Verlag GmbH on behalf of the Deutsche Keramische Gesellschaft (DKG). Edited by Yu-Ping Zeng, Shanghai Institute of Ceramics, Chinese Academy of Sciences, China.

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Articles

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Influence of Phosphoric Acid Treatment on the Photocatalytic Activity of Zinc Oxide

H. Onoda, Y. Sato

Department of Informatics and Environmental Sciences, Kyoto Prefectural University, 1 – 5, Shimogamo Nakaragi-cyo, Sakyo-ku, Kyoto 606 – 8522, Japan

received August 12, 2016, received in revised form September 21, 2016, accepted October 12, 2016

Vol. 7, No. 4, Pages 397-402   DOI: 10.4416/JCST2016-00053

Abstract

Zinc oxide is often used as a white pigment for cosmetics; however, it exhibits photocatalytic activity that causes the decomposition of sebum on the skin when exposed to the ultraviolet radiation in sunlight. In this work, zinc oxide was reacted with various concentrations of phosphoric acid for several hours to synthesize a novel white pigment for cosmetics. The chemical composition, powder properties, photocatalytic activities, colors, and smoothness of these pigments were studied. The obtained materials exhibited x-ray diffraction peaks relating to zinc oxide and phosphate after phosphoric acid treatment. The ratio of zinc phosphate to zinc oxide was estimated from inductively coupled plasma results. The sample treated for 6 hours had a high P/Zn ratio, therefore this sample contained a larger amount of zinc phosphate. The concentration of phosphoric acid had less influence on the P/Zn ratio than the processing time. The particle size of the samples became larger with phosphoric acid treatment. The photocatalytic activity of the zinc oxide was inhibited by the phosphoric acid treatment. The obtained samples had enough high reflectance in the visible light region.

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Keywords

Zinc oxide, phosphoric acid treatment, photocatalytic activity, particle size

References

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