Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Shanghai 200237, PR China.
J Hazard Mater. 2010 May 15;177(1-3):781-91. doi: 10.1016/j.jhazmat.2009.12.102. Epub 2010 Jan 4.
The multidimensional aspects of the photocatalytic activity were investigated in a systematic way by employing the dyes Acid Orange 7 (AO7) and Methyl Orange (MO) as substrates in terms of their degradation or conversion rates. 4.0% WO(x)/TiO(2) nanocomposite demonstrated the best reactivity under visible light, allowing more efficient usage of solar light. The reduced form of W decreased the band gap and inhibited electron hole recombination efficiently. This composite was characterized by X-ray diffraction spectroscopy (XRD), UV-vis diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX). A series of experiments were conducted to investigate the operational parameters under visible light irradiation such as optimization of nanocomposites wt%, change of pH, reuse of catalyst and initial dye concentration. The kinetics of the dyes degradation was found to follow the Langmuir-Hinshelwood model. Decomposition or mineralization was investigated with the changes of absorption spectra, pH, degradation efficiency and TOC removal in visible irradiation systems. FT-IR spectroscopy of these adsorbed dyes on WO(x)/TiO(2) powder provided an insight to the mode of its adsorption on WO(x)/TiO(2). It was found that the dye adsorbed on WO(x)/TiO(2) underwent a series of oxidation steps which lead to decolorization and formation of a number of intermediates mainly aromatic and aliphatic acids. These intermediates were quantified by GC/GC-MS.
采用酸性橙 7（AO7）和甲基橙（MO）作为底物，从降解或转化速率方面系统地研究了光催化活性的多维性。4.0% WO(x)/TiO(2)纳米复合材料在可见光下表现出最佳的反应活性，允许更有效地利用太阳光。W 的还原形式降低了带隙并有效地抑制了电子空穴复合。该复合材料通过 X 射线衍射光谱（XRD）、紫外可见漫反射光谱（DRS）、透射电子显微镜（TEM）和能谱（EDX）进行了表征。进行了一系列实验来研究可见光照射下的操作参数，例如纳米复合材料的 wt%优化、pH 值变化、催化剂的重复使用和初始染料浓度。发现染料降解的动力学遵循 Langmuir-Hinshelwood 模型。通过吸收光谱、pH 值、降解效率和 TOC 去除的变化，在可见辐射系统中研究了分解或矿化。WO(x)/TiO(2)粉末上吸附染料的傅里叶变换红外光谱（FT-IR）提供了其在 WO(x)/TiO(2)上吸附模式的见解。发现吸附在 WO(x)/TiO(2)上的染料经历了一系列氧化步骤，导致褪色和形成许多中间体，主要是芳香族和脂肪族酸。这些中间体通过 GC/GC-MS 进行了定量。
