Electrochemical Materials Laboratory, Department of Physics, Shivaji University, Kolhapur 416 004, India.
Division of Biotechnology, Chonbuk National University, Iksan 570-752, South Korea.
Ultrason Sonochem. 2017 Mar;35(Pt A):233-242. doi: 10.1016/j.ultsonch.2016.09.024. Epub 2016 Sep 28.
The WO and stratified WO/TiO thin films are successfully prepared by the spray pyrolysis method. The structural, morphological, compositional and photoelectrocatalytic properties of WO and stratified WO/TiO thin films are studied. XRD analysis confirms that films are polycrystalline with monoclinic and tetragonal crystal structures for WO and TiO respectively. The SEM images clearly show 3D sheeted porous structure of the as-prepared TiO forms on WO in stratified WO/TiO samples. The synthesized photoelectrodes was used as catalyst for photoelectrocatalytic degradation of oxalic acid in aqueous medium. The rate constant (k) was evaluated as a function of the initial concentration of species. A significant decrease in concentrations of organic species was observed from COD analysis. The photoelectrocatalytic degradation effect is relatively higher in the case of the stratified WO/TiO than WO thin film photoelectrode in the degradation of oxalic acid and 83% removal efficiency of oxalic acid is obtained after 180min. Based on the obtained experimental data, the possible photoelectrocatalytic reaction mechanism was proposed. The photoelectrocatalytic experimental results indicate that stratified WO/TiO photoelectrode is the promising material for removing of water pollutants.
WO 和分层 WO/TiO 薄膜通过喷雾热解法成功制备。研究了 WO 和分层 WO/TiO 薄膜的结构、形态、组成和光电催化性能。XRD 分析证实，薄膜为多晶，WO 为单斜晶和 TiO 为四方晶结构。SEM 图像清楚地显示了分层 WO/TiO 样品中 TiO 在 WO 上形成的 3D 片状多孔结构。合成的光电极用作光电催化降解水溶液中草酸的催化剂。通过初始浓度的函数评估速率常数 (k)。通过 COD 分析观察到有机物质的浓度明显下降。在光电催化降解草酸的情况下，分层 WO/TiO 薄膜比 WO 薄膜光电极的效果更高，草酸的去除效率达到 180 分钟后达到 83%。根据获得的实验数据，提出了可能的光电催化反应机制。光电催化实验结果表明，分层 WO/TiO 薄膜光电极是去除水中污染物的有前途的材料。
