Combinatorial doping of TiO2 with platinum (Pt), chromium (Cr), vanadium (V), and nickel (Ni) to achieve enhanced photocatalytic activity with visible light irradiation
Combinatorial doping of TiO2 with platinum (Pt), chromium (Cr), vanadium (V), and nickel (Ni) to achieve enhanced photocatalytic activity with visible light irradiation
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DOI：
10.1557/jmr.2010.0024
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发表时间：
2010-01-01
影响因子：
2.7
通讯作者：
Hoffmann, Michael R.
中科院分区：
文献类型：
--
作者：
Choi, Jina;Park, Hyunwoong;Hoffmann, Michael R.
二氧化钛（TiO 2）掺杂有包括铂（Pt）、铬（Cr）、钒（V）和镍（Ni）的几种金属离子的组合。通过标准溶胶-凝胶法合成掺杂的TiO 2材料，掺杂水平为0.1至0.5原子%。通过X射线衍射（XRD）、BET比表面积测量、扫描电子显微镜（SEM）和紫外-可见漫反射光谱（DRS）对所得材料进行了表征。共掺杂样品的可见光光催化活性通过测量在λ> 400 nm的水溶液中碘化物的氧化速率、亚甲基蓝（MB）的降解速率和苯酚的氧化速率来定量。0.3原子百分比Pt-Cr-TiO 2和0.3原子% Cr-V-TiO 2对亚甲基蓝的降解和碘离子的氧化分别表现出最高的可见光光催化活性。然而，没有一个共掺杂的二氧化钛样品被发现具有增强的光催化活性苯酚降解相比，其单掺杂的二氧化钛对应物。
Titanium dioxide (TiO2) was doped with the combination of several metal ions including platinum (Pt), chromium (Cr), vanadium (V), and nickel (Ni). The doped TiO2 materials were synthesized by standard sol-gel methods with doping levels of 0.1 to 0.5 at.%. The resulting materials were characterized by x-ray diffraction (XRD), BET surface-area measurement, Scanning electron microscopy (SEM), and UV-vis diffuse reflectance spectroscopy (DRS). The visible light photocatalytic activity of the codoped samples was quantified by measuring the rate of the oxidation of iodide, the rate of degradation of methylene blue (MB), and the rate of oxidation of phenol in aqueous solutions at lambda > 400 nm. 0.3 at.% Pt-Cr-TiO2 and 0.3 at.% Cr-V-TiO2 showed the highest visible light photocatalytic activity with respect to MB degradation and iodide oxidation, respectively. However, none of the codoped TiO2 samples were found to have enhanced photocatalytic activity for phenol degradation when compared to their single-doped TiO2 counterparts.