引用本文:
姚超, 高国生, 林西平, 汪信. 氢氧化铝对纳米TiO2的表面包覆[J]. 应用化学,
2005, 22(7): 759-763.
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.
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.
氢氧化铝对纳米TiO2的表面包覆
摘要:
通过硫酸铝水解生成的氢氧化铝对金红石相纳米TiO2进行表面处理,利用X射线衍射、X射线光电子能谱、Zeta电位分析仪、透射电镜和比表面仪测试技术对纳米TiO2进行了表征,并测定了纳米TiO2光稳定性随包覆量的变化。结果表明,氢氧化铝所形成的包覆层是疏松和多孔的。当m(Al2O3):m(TiO2)=1:10时,氢氧化铝以非晶态形式存在,当m(Al2O3):m(TiO2)≥1:5时,出现了三羟铝石结构,三羟铝石的晶粒尺寸为20~25 nm。从电子结合能的变化可以推测,包覆层的铝以化学键合的方式沉积在纳米TiO2的表面,形成了Al-O-Ti键。Zeta电位和比表面积的测试结果表明,随着m(Al2O3):m(TiO2)的增大,纳米TiO2颗粒的等电点由pH=4.2逐渐移至pH=8.0,比表面积缓慢下降。
English
Studies on Nanosized TiO2 Coated with Aluminum Hydroxide
Abstract:
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.
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Key words:
- nanosized TiO2
- / aluminum hydroxide
- / coating
- / photostability
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