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首页> 外文会议>Progress in environmental science and technology.;vol. 3. >Improved Photocatalytic Degradation of Methyl Orange by Polyoxometalates Supported on Titanium Dioxide Doping with Rare Earth
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Improved Photocatalytic Degradation of Methyl Orange by Polyoxometalates Supported on Titanium Dioxide Doping with Rare Earth

机译：稀土负载TiO2负载多金属酸盐改善甲基橙的光催化降解。

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Dye wastewater pollution has become a global issue with the development of textile industry. Polyoxometalates photocatalysis is an effective process in degradation of dye wastewater. This paper is to develop a novel supported polyoxometalates photocatalytic material. The H3PW12O40-Y2O3-TiO2 nano photocatalyst was prepared by impregnation method while the Y2O3-TiO2 support was synthesized via sol-gel technology for the first time. The compound was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), nitrogen adsorption-desorption determination and scanning electron microscopy (SEM). The measurements results demonstrate that the original Keggin structure of the polyoxometalates remained intact and there exist anatase phase in the prepared material. The photocatalytic degradation of azo-dye, Methyl Orange (MO) under UV light (λ≥365 nm) in the presence of H3PW12O40-Y2O3-TiO2 photocatalyst in aqueous solution had been investigated and compared with the photodegradation by TiO2 and Y2O3-TiO2 suspensions. The supported polyoxometalates exhibited excellent photocatalytic activity due to the fact that MO was almost completely degraded in 20 min with initial pH=1.0. The photocatalytic activity of polyoxometalates was greatly enhanced, comparing with the staring polyoxometalates, by the synergistic effect between polyoxometalates and anatase Y2O3-TiO2 as well as the increased surface area. Leakage of H3PW12O40 from the compound was hardly observed during catalytic tests, which attributes to the strong chemical but not simply physical interaction between the Keggin units and the Y2O3-TiO2 support. The prepared material is insoluble and easily separated from reaction system for recovery. Any drop of the photocatalytic activity after 8 times’ cyclic operation was not found, revealing that the prepared catalysts are stable.
机译：随着纺织工业的发展，染料废水污染已成为全球性问题。多金属氧酸盐光催化是降解染料废水的有效方法。本文旨在开发一种新型的负载型多金属氧酸盐光催化材料。采用浸渍法制备了H3PW12O40-Y2O3-TiO2纳米光催化剂，首次采用溶胶-凝胶技术合成了Y2O3-TiO2载体。通过傅里叶变换红外光谱（FTIR），X射线衍射（XRD），氮吸附-脱附测定和扫描电子显微镜（SEM）对化合物进行表征。测量结果表明，多金属氧酸盐的原始Keggin结构保持完整，并且在制备的材料中存在锐钛矿相。研究了H3PW12O40-Y2O3-TiO2光催化剂在水溶液中存在下紫外光（λ≥365nm）下偶氮染料甲基橙（MO）的光催化降解，并与TiO2和Y2O3-TiO2悬浮液的光降解性能进行了比较。 。负载的多金属氧酸盐由于在初始pH = 1.0的20分钟内MO几乎完全降解的事实而显示出优异的光催化活性。与多金属氧酸盐相比，多金属氧酸盐的光催化活性大大提高了，这是由于多金属氧酸盐与锐钛矿型Y2O3-TiO2的协同作用以及表面积的增加。在催化测试期间，几乎没有观察到H3PW12O40从化合物中泄漏，这归因于Keggin单元和Y2O3-TiO2载体之间的强化学相互作用，而不仅仅是物理相互作用。所制备的物质是不溶的，并且容易与反应系统分离以进行回收。在8次循环操作后未发现光催化活性的任何下降，表明所制备的催化剂是稳定的。

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