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La3+摻雜TiO2粉體的化學沉淀法制備條件優(yōu)化
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國家自然科學基金（51362017）


Preparation Optimization of La3+ Doped TiO2 Powder by Chemical Precipitation
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    摘要:

    采用化學沉淀法制備La3+摻雜TiO2粉體，并用正交實驗方法對制備工藝進行優(yōu)化，通過SEM、XRD、XPS和UV-Vis對TiO2粉體的形貌、結(jié)構(gòu)、光吸收性能進行了表征。結(jié)果表明：煅燒溫度和La3+摻雜量對TiO2粉體光吸收性能具有顯著影響；不同煅燒溫度得到的La3+摻雜TiO2均以銳鈦礦結(jié)構(gòu)為主；升高煅燒溫度可以增強La3+摻雜TiO2在紫外光波段的吸光強度； La3+摻雜可以改善TiO2粉體的團聚，減小TiO2的禁帶寬度，同時導致TiO2表面吸附一定數(shù)量的羥基。最優(yōu)的制備條件為：煅燒溫度800 ℃，La3+摻雜量0.6%（摩爾分數(shù)），反應溫度為90 ℃，反應液pH值為8，此條件下獲得的TiO2粉體可見光性能最優(yōu)。

    Abstract:

    La3+ doped TiO2 powder was prepared by chemical precipitation and the technique was optimized by an orthogonal experiment. The morphology, structure and light absorption properties of TiO2 powders were characterized by SEM, XRD, XPS and UV-Vis. The results show that the effect of the calcinating temperature and the amount of La3+ on optical absorption properties of TiO2 is significant. The main crystal structure of La3+ doped TiO2 powder at different calcinating temperatures is anatase. Higher calcinating temperature can enhance the absorption intensity of La3+ doped TiO2 in the UV band. Doping La3+ can improve agglomeration of TiO2 powder and narrow the band gap of TiO2. In addition, a certain amount of hydroxyls are also adsorbed on the surface of TiO2 due to La3+ doping. The optimal preparation conditions of La3+ doped TiO2 powder are as follows: the calcinating temperature 800 °C, the amount of La3+ 0. 6 mol%, the solution temperature 90°C, and the pH value 8.0. TiO2 powder prepared under the above conditions has the optimal visible light property.

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杜景紅,嚴繼康,張家敏,劉意春,甘國友,易健宏. La3+摻雜TiO2粉體的化學沉淀法制備條件優(yōu)化[J].稀有金屬材料與工程,2015,44(11):2821~2825.[Du Jinghong, Yan Jikang, Zhang Jiamin, Liu Yichun, Gan Guoyou, Yi Jianhong. Preparation Optimization of La3+ Doped TiO2 Powder by Chemical Precipitation[J]. Rare Metal Materials and Engineering,2015,44(11):2821~2825.]
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  • 收稿日期:2014-11-10
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  • 在線發(fā)布日期: 2016-07-29
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