TiCl_4水解法制备TiO_2薄膜的表征及光催化性能

Characterization and Photocatalytic Activity of TiO_(2) Thin Films Prepared by TiCl_(4) Hydrolysis

以TiCl4水解法,采用浸渍提拉法在玻璃片上制备TiO2纳米薄膜。用XRD及SEM、EDS测定和表征TiO2薄膜的表面形貌和结构特性,以UV吸收光谱和可见光透光率表征薄膜的光学特性。结果表明,所得薄膜负载质量与镀膜次数有很好的线性关系,镀膜4次的TiO2薄膜具有表面均匀、厚度约为0 192μm,粒子粒径约为5.0nm,对紫外光强烈吸收并有红移拓宽。TiO2薄膜作为催化剂对500mL的20mg/L乙酸的降解率达到75.9%,比等负载量的粉末TiO2光催化的48.0%降解率高27.9%。

Nanostructured TiO_(2) thin films were fabricated on glass substrates by soaking the substrates in and (lifting) the substrates from TiO_(2) colloids prepared via the hydrolysis of TiCl_(4). The thin films were investigated by means of X-ray diffraction(XRD), scanning electron microscopy(SEM), and energy dispersion spectroscopy(EDS) to characterize the particle size and surface properties. UV absorption spectroscopy and the visible light transmission rate were employed to investigate the optical characteristics of the thin films. The photo-(catalytic) activity was determined by degrading acetic acid in aqueous solution. The results show that the mass of thin film was in good linear relationship with the number of coated layers, and the thin film with 4 coated layers and 0.192 μm in thickness with the diameter of TiO_(2) particles being 0.5 nm can strongly absorb (ultraviolet) radiation, and the absorption band exhibited a red shift. The photocatalytic degradation rate of (500 mL) of (20 mg/L) acetic acid on the thin films was 75.9%, 27.9% higher than the degradation rate of the same reaction catalyzed by the same (amount) of TiO_(2) powder produced from the Sol-gel solution within 350 min, which demonstrates the higher (photocatalytic) activity of the thin films.