【摘要】 目的研究层涂法制备Pr³⁺:Y₂SiO₅/TiO₂复合薄膜的结构与可见光催化性能。方法分别以钛酸丁酯（TBOT）和正硅酸乙酯（TEOS）为前驱体,通过溶胶-凝胶法制得TiO₂凝胶和Pr掺杂的Y₂SiO₅凝胶,以碳纤维为薄膜载体,并通过浸渍提拉法制备Pr³⁺:Y₂SiO₅/TiO₂层涂薄膜,研究层涂法制备复合薄膜对复合薄膜结构、形貌以及光催化效果的影响。结果复合薄膜具有明显的分层界限,形貌较平整,有较少龟裂;复合薄膜性能受涂覆次序的影响较大。结论依次将Pr³⁺:Y₂SiO₅和TiO₂涂覆在碳纤维上的复合薄膜具有较好的光催化性能,可见光光照2 h,对亚甲基蓝的脱色率达到94%,其可见光催化效率高于TiO₂薄膜的59%。更多还原

【Abstract】 Objective To study structure and visible light catalytic property of Pr³⁺:Y₂SiO₅/TiO₂ composite membrane prepared by the layer coating method. Methods Butyl titanate（TBOT） and ethyl orthosilicate（TEOS） were taken as precursor to prepare Pr doping Y₂ SiO₅ gel and TiO₂ gel by the sol-gel method. The carbon fiber was taken as the film carrier to prepare Pr³⁺:Y₂SiO₅ /TiO₂ layer of coating film by the dip-coating method. Influences of the composite membrane prepared by layer coating on structure, morphology and photocatalytic performance of composite membrane were studied. Results Composite film had obvious stratification, smooth topography, and few fractures. Performance of composite film was strongly influenced by the coating sequence. Conclusion Composite membranes with carbon fiber being coated with Pr³⁺:Y₂SiO₅ and TiO₂ in sequence have good photocatalytic performance. The decolourization ratio of methylene blue decolorization can reach 94% after two hours of visible light radiation; its visible light catalytic efficiency is higher than 59% of TiO₂ thin film.更多还原