Gold Nanoparticle-Decorated Keggin lons/TiO2 Photococatalyst for Improved Solar Light Photocatalysis
Gold Nanoparticle-Decorated Keggin lons/TiO2 Photococatalyst for Improved Solar Light Photocatalysis
复制标题
DOI：
10.1021/la2007765
复制
发表时间：
2011-06-07
期刊：
影响因子：
3.9
通讯作者：
Bansal, Vipul
中科院分区：
文献类型：
--
作者：
Pearson, Andrew;Jani, Harit;Bansal, Vipul
我们展示了一种简易的本地化还原方法来合成Au纳米粒子修饰的Keggin离子/TiO 2光助催化剂，用于改善太阳能光伏应用。这已经通过利用TiO 2结合的Keggin离子作为UV可切换的高度局部化的还原剂的能力来实现。值得注意的是，本文提出的方法在基于水溶液的合成过程中不会导致所得助催化剂被游离金属纳米颗粒污染。研究表明，Keggin离子（磷钨酸，PTA），是光活性分子，Au纳米粒子和PTA的存在下，在二氧化钛表面上的助催化系统可以有一个显着的效果，增加复合系统的光催化性能，而不是二氧化钛表面直接装饰有金属纳米粒子没有夹PTA层。这些材料对降解有机刚果红染料的光催化性能的显著提高与向其中加入Au后的TiO 2的光催化性能的2.7倍和向其中引入PTA沿着Au后的4.3倍相关。本文报道的制备TiO 2-PTA-Au助催化剂的一般化局部还原方法可以进一步扩展到其他类似系统，其中可以利用在不同Keggin离子存在下的一系列金属纳米颗粒。这里报道的复合材料可能对有机物种的降解和太阳能电池应用具有广泛的潜在影响。
We demonstrate a facile localized reduction approach to synthesizing a Au nanoparticle-decorated Keggin ion/TiO2 photococatalyst for improved solar light photocatalysis application. This has been achieved by exploiting the ability of TiO2-bound Keggin ions to act as a UV-switchable, highly localized reducing agent. Notably, the approach proposed here does not lead to contamination of the resultant cocatalyst with free metal nanoparticles during aqueous solution-based synthesis. The study shows that for Keggin ions (phosphotungstic acid, PTA), being photoactive molecules, the presence of both Au nanoparticles and PTA on the TiO2 surface in a cocatalytic system can have a dramatic effect on increasing the photocatalytic performance of the composite system, as opposed to a TiO2 surface directly decorated with metal nanoparticles without a sandwiched PTA layer. The remarkable increase in the photocatalytic performance of these materials toward the degradation of a model organic Congo red dye correlates to an increase of 2.7-fold over that of anatase TiO2 after adding Au to it and 4.3-fold after introducing PTA along with Au to it. The generalized localized reduction approach to preparing TiO2-PTA-Au cocatalysts reported here can be further extended to other similar systems, wherein a range of metal nanoparticles in the presence of different Keggin ions can be utilized. The composites reported here may have wide potential implications toward the degradation of organic species and solar cell applications.