Preparation of nanosized anatase TiO2-coated kaolin composites and their pigmentary properties

✍ Scribed by Zhangzhun Lu; Min Ren; Hengbo Yin; Aili Wang; Chen Ge; Yunsheng Zhang; Longbao Yu; Tingshun Jiang

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 631 KB
• Volume: 196
• Category: Article
• ISSN: 0032-5910
• DOI: 10.1016/j.powtec.2009.07.006

✦ Synopsis

Nanosized anatase TiO 2 -coated kaolin composites were prepared by the chemical deposition method starting from calcined kaolin and TiCl 4 . The resultant TiO 2 nanoparticles on the kaolin surfaces existed in anatase phase after calcination at 200, 400, and 900 °C for 1 h, respectively. The surfaces of the kaolin powders were uniformly coated by a monolayer of TiO 2 nanoparticles. The higher calcination temperature was beneficial to formation of well crystallized anatase TiO 2 nanoparticles. The light scattering indexes of the TiO 2 -coated calcined kaolin composites were two times higher than that of the kaolin substrate. XPS analysis shows that TiO 2 coating layers anchored at the kaolin surfaces via the Ti-O-Si and Ti-O-Al bonds.