磁性Fe3O4@TiO2SiO2气凝胶催化剂的制备及光催化性能的研究.docx

磁性Fe304@Ti02／SiCh气凝胶催化剂的制备及光催化性能的研究分析得知该催化过程复合一级动力学反应，而且该复合型Fe304@Ti02／Si02气凝胶 磁性Fe304@Ti02／SiCh气凝胶催化剂的制备及光催化性能的研究 分析得知该催化过程复合一级动力学反应，而且该复合型Fe304@Ti02／Si02气凝胶 催化剂具有良好的循环利用性。 Fe304@Ti02／Si02气凝胶催化剂在处理污水中可以体现以下三大优点：良好的 光催化活性、强吸附能力和高磁性，是一种具有高效催化活性的廉价光催化剂。 关键词：Fe304：光催化；罗丹明B；Si02气凝胶 万方数据 大连理工大学硕士学位论文Preparation 大连理工大学硕士学位论文 Preparation and photocatalytic performance of magnetic Fe304@Ti02／Si02 aerogel catalyst AbslTact With the development of industry and agriculture，which cause serious damage tO the surrounding environment and Can be hardly destroyed with traditional wastewater treatment methods．Therefore，the removal of reactive dyes from aqueous solution is necessary and very important．During the past decades，photocatalytic degradation of organic dyes by using semiconductor nanoparticles is of growing interest for environmental remediation．Among various photocatalysts，titania has been employed widely in the destruction of organic pollutants due to its low cost，excellent chemical stability，non-toxicity and high photocatalytic activity．Ti02 generates electron and hole pairs(e-／h+)upon irradiation with light energy equal to or greater than its band gap energy．If charge separation is maintained，the photo—generated electrons and holes may migrate to the catalyst surface and participate in interfacial redox reactions with sorbed species．However，the utilization of Ti02 nanoparticles in practical applications such as wastewater treatment is impaired by its low capacity for the adsorption of hydrophobic contaminants，the fast recombination of photogenerated electron-hole pairs that limits photo—quantum efficiency，and the inconvenience to separate and recycle of nanometer sized Ti02 particles from water．Therefore，many strategies have been proposed to enhance the absorption capability and photocatalytic activity of Ti02 nanoparticles． Based on Ti02 above disadvantages，we developed Si02 aerogel with a high specific surface area and Fe304 with magnetic response．In the end．we prepare