Zn-Ti-O/FTO复合薄膜的选择降解

Selective degradation of Zn-Ti-O/FTO composite film

采用溶胶-凝胶法在氟掺杂氧化锡(fluorine-doped tin oxide,FTO)导电玻璃上制备Zn-Ti-O/FTO复合薄膜,并通过X射线衍射(X-ray diffraction,XRD)分析样品的物相结构,利用紫外可见(ultra-violet and visible,UV-Vis)分光光度计测试样品的吸收光谱,使用扫描电子显微镜(scanning electron microscope,SEM)表征样品的微观形貌.分别研究了Zn-Ti-O/FTO对甲基橙(methyl orange,MO)、亚甲基蓝(methylene blue,MB)以及罗丹明B(rhodamine B,RhB)的光催化降解作用.结果表明:所得到的Zn-Ti-O/FTO结构表现出明显的有机物降解的优选性,对于MB具有光催化降解效率为90.3%/(6 h)的最优降解效果.这种优选性可能与薄膜、衬底的导带底/价带顶以及有机降解物的最低未占分子轨道能级和最高占据分子轨道能级的相对位置相关.

The Zn-Ti-O composite film prepared from fluorine-doped tin oxide(FTO)conducting glass with sol-gel technology has been investigated,whose phase structures analyzed by X-ray diffraction(XRD),absorption spectra measured by UV-Vis spectrophotometer,and morphologies characterized by scanning electron microscope(SEM).The photocatalytic reaction of Zn-Ti-O/FTO has been tested by ultraviolet light with wavelength of 255 nm as light source to methyl orange(MO),methylene blue(MB)and rhodamine B(RhB),respectively.Results indicate that the Zn-Ti-O film prepared on FTO substrate shows obvious preference for degradation of organic compounds—the optimal degradation of MB is 90.3%/(6 h).This preference may be related to the relative positions of the bottom of conduction band/the top of valence band of film and substrate,and the lowest unoccupied molecular orbital/highest occupied molecular orbital of the organic degradation.