【摘要】 不同硫酸浓度条件下,利用浸渍法处理TiO₂-La₂O₃,制得系列固体超强酸SO₄^2-/TiO₂-La₂O₃。通过XRD、FT-IR、TG-DTA和UV-Vis表征,揭示SO₄^2-/TiO₂-La₂O₃的微观结构和内在规律性。以邻硝基苯酚为探针反应,考察SO₄^2-/TiO₂-La₂O₃光催化性能。结果表明,SO₄^2-/TiO₂-La₂O₃的光催化活性明显高于TiO₂-La₂O₃,SO₄^2-/TiO₂-La₂O₃的催化活性取决于H₂SO₄浓度,浸渍液中H₂SO₄的合适浓度为0.5 mol·L^-1,掺杂La₂O₃适宜的物质的量分数为0.5%,最佳焙烧温度为500℃。更多还原

【Abstract】 The photocatalysts SO₄^2-/TiO₂-La₂O₃ loaded with SO₄^2-anion in H₂SO₄ solution of different concentration were prepared by impregnation method and characterized by XRD,FT-IR,TG-DTA and UV-Vis in order to reveal the mierostructure and inherent regularity of SO₄^2-/TiO₂-La₂O₃. The photoeatalytic properties of the catalysts was investigated using o-nitrophenol degradation as the probe reaction. The results showed that the photocatalytic activity of SO₄^2-/TiO₂-La₂O₃ was higher than that of TiO₂-La₂O₃ and depended on the sulfuric acid concentration. The optimum preparation condition of the catalyst was as follows:sulfuric acid concentration 0.5 mol · L^-1 ,La₂O₃ doping amount 0.5% （molar ratio） and calcination temperature 500 ℃.更多还原