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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 3    June 2009

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Effect of La3+ on evolution of TiO2 coating layers on lamellar sericite and
their pigmentary properties
REN Min(任 敏), YIN Heng-bo(殷恒波), LU Zhang-zhun(卢章准), GE Chen(葛 晨),
WANG Ai-li(王爱丽), YU Long-bao(喻龙宝), JIANG Ting-shun(姜廷顺)

Faculty of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China

Abstract:TiO2-coated sericite powders were prepared by the chemical deposition method starting from lamellar sericite and TiCl4 in the presence of La3+. After calcination at 900 ℃ for 1 h, the resultant TiO2 nanoparticles on the sericite surfaces exist in anatase phase. The light scattering indexes of the TiO2-coated lamellar sericite powders are dozens of times higher than those of the naked lamellar sericite powders, varying with different contents of La3+. The presence of La3+ in the deposition solution is beneficial to the formation of the small-sized anatase TiO2 nanoparticles. The presence of La3+ also favors the formation of the dense and uniform island-like TiO2 coating layers in a large range of the mass ratio of TiO2 to sericite from 5% to 20%. XPS analysis shows that when La3+ is absent in the reaction solution, TiO2 coating layers anchor on the sericite surface via Ti—O—Si and Ti—O—Al bonds. The presence of La3+ causes the formation of Si—O—La and Al—O—La bonds on the sericite surface and Ti—O—La bond on the surface of TiO2 coating layers.

 

Key words: lamellar sericite; TiO2 coating; lanthanum

ISSN 1672-7029
CN 43-1423/U

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