Preparation of Nano-TiO2 Thin Film by Agar Coating Method and Its Photocatalytic Degradation Performances
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摘要: 采用琼脂包覆法制备TiO2纳米薄膜,并研究所制备的TiO2纳米薄膜的光催化性能。用XRD、BET、FESEM、FTIR、EDX和紫外—可见漫反射光谱等方法对薄膜进行了表征。结果表明,采用琼脂包覆法可以减小TiO2的粒径到20 nm,而采用一般溶胶凝胶法制备的TiO2晶粒尺寸为30 nm左右。琼脂包覆法制备的TiO2薄膜粒子均匀分布,无裂纹。紫外—可见漫反射光谱的结果分析表明,采用琼脂包覆法制备的TiO2纳米薄膜具有更小的带隙,120 min内对亚甲基蓝的去除率达到71%。且在5次循环处理之后,琼脂包覆法制备的TiO2纳米薄膜仍然保持很高的活性。依据反应特性对添加了琼脂的TiO2形成薄膜的机理进行了探讨。Abstract: Nano-TiO2 thin films were prepared by agar coating method,and the photocatalytic properties of the prepared TiO2 thin films were studied.The thin films were characterized by XRD,BET,FESEM,FTIR,EDX and UV-Vis DRS.The results show that the crystal size of TiO2 prepared by agar coating can be reduced to 20 nm,while the crystal size of TiO2 prepared by common sol-gel method is about 30 nm.The surface images show that the nano-TiO2 thin films prepared by agar coating are uniformly distributed and have uniform morphology without crack.The results of UV-Vis DRS show that the bandgap of TiO2 is reduced by adding agar,and the removal efficiency of methylene blue by the prepared TiO2 is 71% in 120 min.The activity of TiO2 remains at high level after 5 cycles of methylene blue treatment.The formation mechanisms of coating of nano-TiO2 are also discussed based on the reaction characteristics.
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Key words:
- TiO2 /
- nano thin films /
- agar coating method /
- photocatalysis /
- methylene blue /
- removal rate
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