Mechanisms of Enhancement of Photocatalytic Properties and Activity of Nd3+-Doped TiO2 for Methyl Orange Degradation
来源期刊：JOURNAL OF RARE EARTHS2004年第4期
论文作者：周国逸 万洪富 侯梅芳 谢克昌 李芳柏 李瑞丰
Key words：catalytic chemistry; photocatalysis; TiO2; neodymium,methyl orange; rare earths;
Abstract: Nd3+-doped TiO2 powders were prepared by the sol-gel method. Their crystal pattern and parameter, the specific surface area, the surface chemical state of Ti and the ratio of O/Ti were characterized. The results show that Nd impurity hinders the crystal transformation, and decreases the relative intensity of (101) peak. The crystallite sizes of Nd3+-doped TiO2 powders decrease while their specific surface area increase owing to the Nd3+ doping. The XPS measurement shows that the content of Ti(Ⅲ) and ratio of O/Ti on their surfaces increase significantly with the increase of Nd3+ dosage. The adsorption and photodegradation experiments show that the optimum molar content of Nd3+ is 1.2%.
周国逸1，万洪富2，侯梅芳1，谢克昌3，李芳柏2，李瑞丰3
(1.South China Institute of Botany,Chinese Academy of Sciences,Guangzhou 510650,China;
2.Key Laboratory of Agricultural Environment Pollution Integrated Control,Guangdong Institute of Eco-environment and Soil Science,Guangzhou 510650,China;
3.State Key Laboratory of C1 Chemistry and Technology,Taiyuan University of Technology,Taiyuan 030024,China)
Abstract:Nd3+-doped TiO2 powders were prepared by the sol-gel method. Their crystal pattern and parameter, the specific surface area, the surface chemical state of Ti and the ratio of O/Ti were characterized. The results show that Nd impurity hinders the crystal transformation, and decreases the relative intensity of (101) peak. The crystallite sizes of Nd3+-doped TiO2 powders decrease while their specific surface area increase owing to the Nd3+ doping. The XPS measurement shows that the content of Ti(Ⅲ) and ratio of O/Ti on their surfaces increase significantly with the increase of Nd3+ dosage. The adsorption and photodegradation experiments show that the optimum molar content of Nd3+ is 1.2%.
Key words:catalytic chemistry; photocatalysis; TiO2; neodymium,methyl orange; rare earths;
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