Magnetically separable mesoporous silica nanocomposite and its application in Fenton catalysis
首发时间:2011-06-15
Abstract:A novel magnetically separable core/shell type nanocomposite was synthesized in a facile way and characterized by XRD, UV-Vis, FT-IR, TEM, Nitrogen physisorption and Magnetite susceptibility measurements. In the synthesis procedure, the mesoporous silica shell was coating on the surface of magnetic core directly via a nano-assembling method. After calcination at high temperature (550 oC) for template removal, the spinel phase of maghemite core was retained without any transformation. The resulting material possessed a regularly hexagonal mesoporous structure with a high specific surface area (908.70 m2/g), which were favorable to further functional modification. Once incorporated with iron species by in situ synthesis, the nanocomposite could serve as a Fenton catalyst and was effective in phenol degradation at the given conditions (40 oC, pH=4). At the end of the reaction, it was easily collected by an external magnetic field and remained efficient in reuse.
keywords: magnetic separation mesoporous silica maghemite core Fenton catalyst
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可磁分离的介孔硅纳米复合物及其在Fenton催化中的应用
摘要:研制高效易分离的非均相Fenton催化剂是非均相Fenton氧化高级水处理技术的重要挑战。本文通过简便方法制备了一种新型磁分离的核壳结构纳米复合物。通过XRD, UV-Vis, FT-IR, TEM, N2吸附和磁化率测试等表征了纳米复合物的结构。通过纳米组装方法,介孔分子筛覆盖在氧化铁磁性核表面,在550 oC焙烧除去模板,磁核保持了尖晶石结构。制备的材料比表面积达到908.70 m2/g,高比表面及有助于进一步的功能修饰。通过合成中原位引入铁后,纳米复合物可以作为有效的非均相Fenton催化剂。该催化剂在给定条件下 (40 oC, pH=4)有效降解苯酚。反应结束后,催化剂可以方便地通过外加磁场进行分离回收和循环使用。
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No.4431181468711307****
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可磁分离的介孔硅纳米复合物及其在Fenton催化中的应用
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