【摘要】 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。更多还原

【Abstract】 A new type of photocatalyst, Pt( Ⅳ )/TiO2 was prepared by sol - gel method and characterized with XRD,TEM,XPS and UV - VIS. The observation shows that PtCl4 fine particles sizing about 3 nm were distributed evenly in amorphous microporous tita-nia powders. The UV - VIS measurements indicate that the light response region of the Pt( Ⅳ ) /TiO2 sample was enlarged to the visible light region from original 380 nm of the pure TiO2 sample. The photocatalytic activities were investigated by the degradation of phenol irradiated by artificial sunlight. The results show that the photocatalytic activity of the Pt( Ⅳ ) modified TiO2 sample is better than other samples. The photocatalytic activity of the modified TiO2 sample with 3% Pt( Ⅳ ) (in mole) is the best. Its photocatalytic efficiency is 2 times of the commercial TiO2 sample.更多还原