两步机械球磨法制备M/TiO2复合薄膜及光催化性能研究

采用两步机械球磨法制备了M/TiO₂（M = Al、Sn、Zn、Ti）双层复合薄膜，利用光学显微镜和X射线衍射仪分析了涂层的微观结构和相组成，测定了薄膜的光催化性能，研究了过渡层材质以及球磨时间对复合薄膜光催化性能的影响。研究表明，TiO₂粉体在球磨过程中的晶体结构未发生显著变化，保持了良好的光催化活性。金属过渡层Al、Sn以及Zn将显著削弱复合薄膜的光催化活性，Ti是复合薄膜的理想金属过渡层，制备的Ti/TiO₂复合薄膜具有优异的光催化性能。随着第二步球磨时间的延长，Ti/TiO₂复合薄膜的光催化性能逐渐降低，这是由于第二层薄膜表面TiO₂含量降低的原因所致。

Study on preparation and photocatalytic properties of M/TiO2 composite film by two-step mechanical ball milling

The composite films of M/TiO2(M=Al,Sn,Zn,Ti)were prepared by the two-step mechanical ball milling.The microstructure and phase composition of the composite coating were analyzed by the optical microscopy(OM)and X-ray diffraction(XRD),the photocatalytic properties of the composite films were determined,and the effects of the transition layer materials and milling time on the photocatalytic properties of the composite films were investigated.The results show that,the crystal structure of the TiO2 powders does not change significantly during the ball milling process,and the TiO2 powders still maintain the good photocatalytic activity.The metal transition layers of Al,Sn,and Zn will significantly weaken the photocatalytic activity of the composite films,while Ti is an ideal metal transition layer for the composite film,and the prepared Ti/TiO2 composite films have the excellent photocatalytic properties.With the prolongation of the second step milling time,the photocatalytic properties of the Ti/TiO2 composite films are gradually reduced,which is caused by the decrease of the TiO2 content on the surface of the second film.