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Nano-F /Fe^3+/TiO2 particles were prepared by hydrolysis of tetrabutyl titanate in a mixed CF3COOH-Fe(NO3)3-H2O solution. The photocatalytic decomposition of methylene blue in aqueous solution was used as a probe to evaluate their photocatalytic activities. The powders were characterized by X-ray diffraction (XRD), energy dispersion X-ray spectrum (EDS) and Brunauer-Emmett-Teller (BET) surface area analysis. The results show that F- and Fe^3+ are doped into TiO2. The F^- and Fe^3+ doping can help to enhance the nano-TiO2 photocatalytic activity greatly. The appropriate codoping conditions for F-Fe are n(F)/n(TiO2)=2%, n(Fe)/n(TiO2)=0.05%, and the degradation rate of methylene blue at l h is improved from 73.2% to 87.5%. The codoped nano-F /Fe^3+/TiO2 particles have higher BET specific surface area, smaller crystallite size and higher photocatalytic activity than those of undoped TiO2 particles. 相似文献
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党的十四届五中全会提出“两个根本转变”,即经济体制从传统的计划经济体制向社会主义市场经济体制转变,经济增长方式从粗放型向集约型、效益型转变。“两个根本转变”是我国进行经济体制改革和现代化建设的具体要求,必将引起经济领域的深刻变化,也将引起审计内容和重点的变化。 一、提高经济效益审计在内部 相似文献
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大连市开发区《红星海·世界观》住宅小区为高层住宅建筑小区。本文介绍了其中一栋31层的住宅建筑给排水设计。生活给水和消防给水采用分区供给,排水系统采用分区排入小区内污水管网;对设计中经常遇到的一些问题谈了一些体会和看法。 相似文献
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