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

催化学报 ›› 2013, Vol. 34 ›› Issue (3): 585-592.DOI: 10.1016/S1872-2067(11)60483-X

水热法制备具有高光催化活性的镧掺杂二氧化钛纳米晶

焦艳超, 朱明峰, 陈锋, 张金龙

华东理工大学先进材料重点实验室和精细化工研究所, 上海 200237

收稿日期:2012-10-15 修回日期:2012-11-10 出版日期:2013-04-02 发布日期:2013-04-03
通讯作者: 陈锋
基金资助:
国家自然科学基金(20777015); 上海市教委科研创新项目(13ZZ042).

La-doped titaniananocrystals with superior photocatalytic activity prepared by hydrothermal method

JIAO Yanchao, ZHU Mingfeng, CHEN Feng, ZHANG Jinlong

Key Laboratory for Advanced Materials and Institute of Fine Chemicals, EastChinaUniversity of Science and Technology, Shanghai 200237, China

Received:2012-10-15 Revised:2012-11-10 Online:2013-04-02 Published:2013-04-03
Supported by:
This work was supported by the National Nature Science Foundation of China (20777015) and the Innovation Program of Shanghai Municipal Education Commission (13ZZ042).

摘要/Abstract

摘要：

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.

关键词: 八钛酸钾, 相转变, 镧掺杂二氧化钛, 光催化活性, 水热合成

Abstract:

Potassium titanate (KTO) nanobars were synthesized by a hydrothermal method and used as a precursor to synthesize TiO₂ nanocrystals. La doping of the TiO₂ nanocrystals was achieved by introducing La³⁺ into the hydrothermal media. The hydrothermal transition of KTO to TiO₂ was investigated under various conditions,finding that the pH of the hydrothermal media, the temperature, and the pre-treating procedure play important roles in the phase transition. X-ray diffraction and transmission electron microscopywere used to characterize the crystal phase and morphology of the samples and the transition process of the hydrothermal reaction. The content of La³⁺ in the samples was measured by inductively coupled plasma atomic emission spectroscopy. The photocatalytic activity of the La-doped TiO₂(LaT) was measured under UV light with the degradation of methyl orange (MO, 10 mg/L).The results showed that the photocatalytic activity of TiO₂ was enhanced remarkably by La-doping. LaT hydrothermally prepared with 0.15 mol/L La³⁺at under 180℃ showedthe optimal reaction constant of 0.11 min^-1 for the degradation of MO, about 9.20 and 3.69 times than those of bare TiO₂ and P25, respectively.

Key words: Potassium octatitanate, Phase transition, La-doped titania, Photocatalytic activity, Hydrothermal synthesis

焦艳超, 朱明峰, 陈锋, 张金龙. 水热法制备具有高光催化活性的镧掺杂二氧化钛纳米晶[J]. 催化学报, 2013, 34(3): 585-592.

JIAO Yanchao, ZHU Mingfeng, CHEN Feng, ZHANG Jinlong. La-doped titaniananocrystals with superior photocatalytic activity prepared by hydrothermal method[J]. Chinese Journal of Catalysis, 2013, 34(3): 585-592.

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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

La-doped titaniananocrystals with superior photocatalytic activity prepared by hydrothermal method

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