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采用四氯化钛水解法制备了一系列不同Ag掺杂量的纳米Ag-TiO_2复合薄膜,运用X射线衍射(XRD)、扫描电镜(SEM)、紫外-可见(UV-Vis)光谱、光致发光(PL)谱、可见光透过(T%)光谱等手段对Ag-TiO_2进行了表征,采用接触角测量仪考察了Ag含量对TiO_2薄膜亲水性的影响,并以8W(λ=254nm)的UV灯作为光源,评价了各薄膜光催化降解亚甲基蓝的活性。UV-Vis测试结果表明,Ag的掺杂使TiO_2吸收边发生红移,有效增强可见光的吸收能力。PL测试结果表明,Ag能显著抑制光生电子(e-)和空穴(h+)的复合。T%光谱测试结果表明,Ag掺杂不影响TiO_2薄膜的可见光透过率。Ag的存在大幅度提高了TiO_2薄膜的亲水性以及对亚甲基蓝的光催化降解活性,当掺杂Ag的质量分数为1%时,TiO_2薄膜与水的接触角几乎为0°,同时可使TiO_2薄膜的光催化活性提高约1.5倍。
A series of nano-Ag-TiO 2 composite films with different Ag doping levels were prepared by hydrolysis of titanium tetrachloride. The effects of X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis spectra, (PL) and visible light transmission (T%) spectra were used to characterize the Ag-TiO 2. The influence of Ag content on the hydrophilicity of the TiO 2 thin film was investigated by using a contact angle meter. UV lamp was used as a light source to evaluate the photocatalytic degradation of methylene blue by each thin film. The result of UV-Vis test shows that the doping of Ag causes red shift of the absorbed side of TiO 2, which effectively enhances the absorption of visible light. PL test results show that Ag can significantly inhibit the photoelectron (e-) and hole (h +) complex. T% spectral test results show that, Ag doping does not affect the visible light transmittance of the TiO 2 film. The presence of Ag greatly enhanced the hydrophilicity of TiO 2 films and the photocatalytic degradation activity of methylene blue. When the mass fraction of Ag was 1%, the contact angle of TiO 2 film with water was almost 0 °, The photocatalytic activity of the film increased about 1.5 times.