Preparation and film-growing mechanism of hydrous zirconia coated on TiO₂

Jie Li1,2,3), Ti-chang Sun1), Yong Wang2,3), Li-na Wang2,3), Jing-kui Qu2,3), and Tao Qi2,3) 1) School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China 2) National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 3) Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

摘 要：To overcome the photochemical activity of rutile used as a pigment and improve its durability in application, hydrous zirconia-coated TiO2 was prepared by the precipitation method. High-resolution transmission electron microscope （HRTEM） and X-ray photoelectron spectroscopy （XPS） were used to characterize the morphology and surface structure of hydrous zirconia-coated TiO2. The ζ-potential and ultraviolet （UV） absorption of both coated and uncoated rutile were examined. The results show that hydrous zirconia can not only improve the durability but also raise the lightness. A suitable ZrO2 content of hydrous zirconia-coated TiO2 is about 1.0wt%, and a dense film on the surface of rutile can be formed with better pigmentary properties. Based on the thermodynamic analysis, the zirconia-coating process and the film growth mechanism were discussed.

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