TiO2固定薄膜光催化剂的制备与表征

THE PREPARATION AND CHARACTERIZATION OF TiO_2 THIN FILM PHOTOCATALYST

以钛板为基材,制备TiO2固定薄膜光催化剂.X射线衍射法表征结果表明,TiO2半导体光催化剂主要呈锐钛矿晶型,平均晶粒尺度为35.7nm.电子扫描显微镜法表征结果显示,光催化剂表面形态均匀、致密,TiO2与Ti板结合紧密、牢固.电化学法表征结果显示,光催化剂为n型半导体,外加电场将极大地促进光生电子和空穴的分离,有利于光催化氧化技术效率的提高.苯甲酰胺降解试验表明,外加电场对光催化氧化技术具有较强的辅助作用,电助光催化氧化技术的处理效率远远高于光催化氧化技术,当施加的电极电位为-0.05V(SCE)时,苯甲酰胺在120min时的去除率可达95%.

This study prepared TiO2 film photocatalyst based on Ti plate using sol-gel method. XRD result demonstrated that the prepared photocatalyst mainly consisted of anatase crystals about 35.7nm on the average. SEM characterization result showed that the surface of the photocatalyst was very even and compact. And TiO2 connected with the Ti plate closely and firmly. The photoelectrochemistry characteristic of the photocatalyst tested with electrochemistry method indicated that the prepared photocatalyst was n-type semiconductor and the extra electric field would promote the separation of photogenerated electron and hole in favor of the increase of the photocatalysis efficiency. The degradation experiments of benzamide by photocatalysis and electrically assisted photocatalysis （EAP） demonstrated that the extra electric field had the obvious assistant effect on photocatalysis and the benzamide degradation rate by EAP was much higher than that by photocatalysis. When the electrode potential of photocatalyst was -0. 05V/SCE, the removal efficiency of benzamide could be 95% in 120min.