| 氧化硅对金红石相纳米TiO2微结构的影响 |
| The Effect of Silica on the Microstructure of Nanosized TiO2 in the Rutile Phase |
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| 摘要: 通过硅酸钠水解生成的无定形氧化硅对金红石相纳米TiO2进行修饰,利用红外光谱、紫外-可见漫反射光谱、X射线衍射、透射电镜和比表面仪对纳米TiO2进行了表征。结果表明,氧化硅沉积在纳米TiO2的表面和颗粒之间形成一个空间网络体系,有效地抑制了TiO2晶粒尺寸和原始粒径的长大。当热处理温度低于700 ℃时,经氧化硅处理的纳米TiO2的晶粒尺寸、原始粒径和比表面积几乎不变;当热处理温度高于700 ℃时,经氧化硅处理的纳米TiO2的晶粒尺寸和原始粒径开始缓慢变大,比表面积快速下降,在900 ℃下煅烧2 h,经氧化硅处理的纳米TiO2原始粒径仍为20～40 nm。氧化硅的存在使纳米TiO2吸收紫外线的能力增强并使其平均孔径变小。 |
| 关键词: 纳米TiO2 金红石 晶粒尺寸 原始粒径 微结构 比表面积 孔径 |
| 基金项目: |
| Abstract: The nanosized TiO2 in the rutile phase was modified by amorphous silica using sodium silicate as source ma-terial to hydrolysis. The nanosized TiO2 was characterized by FT-IR, UV-DRS, XRD, TEM and BET techniques. The results show that silica deposits on surface and to gap of nanosized TiO2. Growing of the crystal grains and primary particles are suppressed. When the temperature of heat treatment is lower than 700 ℃, the crystal grain, primary particle and microstructure of nanosized TiO2 are almost unchanged. While the temperature of heat treat-ment is higher than 700 ℃, crystal grain and primary particle grow slowly, specific surface area drops quickly. With calcining at 900 ℃ for 2h,the primary particle size of nanosized TiO2 treated by silica is 20～40 nm. The ultraviolet absorbing capacity of nanosized titanium dioxide is enhanced due to the presence of silica, and its av-erage pore diameter becomes small. |
| Keywords: nanosized TiO2 rutile crystal size primary particle size microstructure specific surface area pore diameter |
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| 全文下载次数: 1910 |
| 姚 超,吴凤芹,林西平,汪 信.氧化硅对金红石相纳米TiO2微结构的影响[J].无机化学学报,2003,19(12):1311-1316. |
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