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Citation: YAO Chao, GAO Guo-Sheng, LIN Xi-Ping, WANG Xin. Studies on Nanosized TiO₂ Coated with Aluminum Hydroxide[J]. Chinese Journal of Applied Chemistry, ;2005, 22(7): 759-763. shu

Studies on Nanosized TiO₂ Coated with Aluminum Hydroxide

YAO Chao ^a,b,, ,
GAO Guo-Sheng ^b ,
LIN Xi-Ping ^b ,
WANG Xin ^a

1.
a School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094;
2.
b Jiangsu Polytechnic University, Changzhou

Corresponding author: YAO Chao,
Received Date: 22 September 2004
Available Online: 7 January 2005
Fund Project: 国家自然科学基金(50372028,50373019) (50372028,50373019)江苏高新科技(BG2002011)资助项目 (BG2002011)

Nanosized TiO₂ in the rutile phase was coated with aluminum hydroxide obtained from the hydrolysis of aluminium sulfate as source material.The nanosized TiO₂ was characterize by means of XRD,XPS,Zeta potential,TEM and BET techniques.The photostability of nanosized TiO₂ was evaluated.The results reveal that the coating layer of aluminum hydroxide is loose and porous.Aluminum hydroxide is amorphous structure when m(Al₂O₃):m(TiO₂)=1:10,while m(Al₂O₃):m(TiO₂)≥1:5,bayerite structure appears and the crystal size of bayerite is 20~25 nm.According to the difference of electron binding energy,it can be inferred that Al atoms in the coating layer are attached to TiO₂ surface via Al-O-Ti bond.The Zeta potentials and BET surface areas show that along with the increase of m(Al₂O₃):m(TiO₂) the isoelectric point of nanosized TiO₂ shifts from pH=4.2 to pH=8.0 and BET surface area drops slowly.
- nanosized TiO₂,
- aluminum hydroxide,
- coating,
- photostability
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Studies on Nanosized TiO₂ Coated with Aluminum Hydroxide