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采用溶胶-凝胶法,在温和的条件下制备了新型光催化剂Pt(Ⅳ)/TiO2,并利用XRD,TEM,XPS和UV-VIS等手段对其进行了表征。结果表明:尺寸为3 nm左右的PtCl4。微粒均匀地分布在无定型、多微孔的TiO2粉末中;UV-VIs测试表明,新型光催化剂Pt(Ⅳ)/TiO2的光响应波长已由纯TiO2的380 nm左右拓宽到了可见光区。在模拟太阳光下,以苯酚的光催化降解为模型反应,研究了该新型光催化剂的光催化活性,结果发现:新型改性的Pt(Ⅳ)/TiO2样品的光催化活性比较高,其中含Pt量为3%摩尔分数的样品的光催化活性最高,其光催化效率是商品TiO2的2倍。
A novel photocatalyst Pt (Ⅳ) / TiO2 was prepared by sol - gel method under mild conditions and characterized by XRD, TEM, XPS and UV - VIS. The results show that PtCl4 is about 3 nm in size. The results of UV-VIs showed that the photoresponse wavelength of new photocatalyst Pt (Ⅳ) / TiO2 has been broadened to the visible range from about 380 nm of pure TiO2. Under simulated sunlight, the photocatalytic degradation of phenol was used as a model reaction to study the photocatalytic activity of the new photocatalyst. The results showed that the photocatalytic activity of the new modified Pt (Ⅳ) / TiO2 sample was high, The photocatalytic activity of samples with Pt content of 3% mole fraction was the highest, and its photocatalytic efficiency was twice that of commercial TiO2.