Synthesis, characterization and photocatalytic activity of Li-, Cd-, and La-doped TiO2
Synthesis, characterization and photocatalytic activity of Li-, Cd-, and La-doped TiO2
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DOI：
10.1016/j.mssp.2015.03.032
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发表时间：
2015-08-01
影响因子：
4.1
通讯作者：
Houas, Ammar
中科院分区：
文献类型：
--
作者：
Elsellami, Leila;Lachheb, Hinda;Houas, Ammar
TiO2粉体的掺杂是用一种含有锂、镉和镧的物质通过溶胶-凝胶法进行的，以扩大它们在可见光范围内的吸收。然后将混合物在450℃下煅烧，通过紫外-可见漫反射光谱（DRS）、x射线衍射（XRD）、扫描电镜（SEM）、比表面积和孔隙率的测量表明，在该温度下，形成了掺杂Li、Cd和La的TiO2，并在可见光范围内有响应。以4-硝基苯酚为模型，在紫外和可见光条件下对化学污染物进行光催化活性评价。掺杂TiO2的吸附等温线遵循Langmuir模型，而光降解则遵循Langmuir Hinshelwood模型——无论TiO2的形貌如何。掺锂（5%）的TiO2在可见光范围内的光催化活性比TiO2 P25高5倍，也有助于在较短的照射时间内实现4-NP的完全矿化。该样品表面最小，为锐钛矿结晶。(c) 2015 Elsevier Ltd.版权所有。
The doping of TiO2 powder was done by a substance containing lithium, cadmium and lanthanum through the sol-gel process in order to widen their absorption in the visible light range. This mixture is subsequently calcined at 450 degrees C. Measurements of UV-vis diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD), scanning electron microscope (SEM), specific surface area and porosity show that, at this temperature, TiO2 which is doped with Li, Cd and La is formed with a response in the visible light range. The evaluation of the photocatalytic activity was carried out using 4-nitrophenol as a model of chemical pollutants in UV and visible conditions. The adsorption isotherms of doped TiO2 follow the Langmuir model and photodegradation shows the Langmuir Hinshelwood model-regardless of TiO2 morphologies. TiO2 doped with lithium (5%) has a photocatalytic activity five times higher than the TiO2 P25 in the visible light range and it also helps to achieve complete mineralization of 4-NP within a short irradiation time. This sample is attributed to the smallest surface and is of anatase crystallites. (c) 2015 Elsevier Ltd. All rights reserved.