砂载混合相TiO $_2$光催化剂在水净化中的应用
Sand Supported Mixed-Phase TiO$_2$ Photocatalysts for Water Decontamination Applications
摘要：
采用有机金属前驱体在石英砂、锆英石砂和金红石砂表面制备了TiO $_2$涂层。采用X射线衍射、X射线荧光、紫外-可见光谱和比表面积测定等方法对载体材料进行表征。用激光拉曼光谱和扫描电镜对涂层的相组成和形貌进行了表征。采用填充床反应器研究了负载型光催化剂对循环水中大肠杆菌的灭活作用。结果发现，砂粒很好地涂覆有均匀的TiO 2层，并且涂层很好地粘附，在850 ℃下烧制后表现出混合的金红石组合物。光催化活性是最高的涂层应用于石英砂，虽然消毒的循环水没有实现与任何材料的调查。石英作为TiO $_2$光催化剂载体材料的优点可能是由于这种材料具有较高的纯度和光学透射率。不能排除通过Si掺杂的电势增强。
英文摘要：
Using an organometallic precursor, TiO$_2$ coatings were fabricated on surfaces of quartz, zircon and rutile sands. X ray Diffraction, X ray Fluorescence, UV Vis spectroscopy and surface area measurement were used to characterise support materials. The phase composition and morphology of the coatings were characterised by laser Raman spectroscopy and SEM respectively. A packed bed reactor was used to study the inactivation of Escherichia coli in recirculating water by the supported photocatalysts. It was found that the sand grains were well coated with a homogenous layer of TiO2 and coatings were well adhered, exhibiting a mixed anatase rutile composition after firing at 850C. Photocatalytic activity was highest in coatings applied to quartz sand, although sterilisation of the recirculating water was not achieved with any of the materials investigated. The advantages of quartz as a TiO$_2$ photocatalyst support material are likely a result of this materials higher purity and optical transmittance. Potential enhancement through Si doping cannot be ruled out.
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