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OALib Journal期刊
ISSN: 2333-9721
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水热法制备具有高光催化活性的镧掺杂二氧化钛纳米晶
DOI: 10.1016/S1872-2067(11)60483-X, PP. 585-592
Keywords: 八钛酸钾,相转变,镧掺杂二氧化钛,光催化活性,水热合成
Abstract:
？采用水热法合成钛酸钾(K2Ti8O17)纳米棒,并将它作为前驱体水热转晶合成TiO2纳米晶,同时通过在水热体系中引入稀土元素La3+实现对TiO2的La掺杂.考察了不同条件下钛酸盐向TiO2的转晶过程,发现水热溶液的pH值、温度以及预处理步骤对转晶过程有很大的影响.利用X射线衍射以及透射电子显微镜对样品的晶相和形貌进行了表征.利用电感耦合等离子体原子发射光谱测量了所合成的La掺杂TiO2样品中的La含量.通过在紫外光下降解甲基橙(MO,10mg/L)测试了La掺杂TiO2样品的光催化性能.结果表明La掺杂后TiO2的光催化活性大大提高.在0.15mol/LLa3+浓度下180oC水热合成的La掺杂TiO2样品显示了最佳的光催化活性.其对MO的光催化降解反应常数高达0.11min-1,大约是空白TiO2样品的9.20倍,P25TiO2的3.69倍.
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