磁载光催化剂TiO_2/SiO_2/Fe_3O

摘要以微米级Fe3O4作为载体,用一种改进的溶胶-凝胶法制得TiO2/SiO2/Fe3O4包覆型光催化剂。采用振动样品磁强计(VSM)、X射线衍射仪(XRD)和透射电镜(TEM)分别对该催化剂的磁性能、晶体结构和微观形貌进行了表征,并通过对Cr6+水溶液的光催化还原对其催化活性进行了测试。结果表明,TiO2/SiO2/Fe3O4是由中间层SiO2和外壳TiO2组成的双层包覆粒子,通过与未包覆SiO2粒子TiO2/Fe3O4的比较,可知采用此种溶胶-凝胶过程制得的TiO2/SiO2/Fe3O4具有较好的磁性能和较高的光催化还原活性。

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关键词： TiO2/SiO2/Fe3O4 光催化磁性还原六价铬

Abstract： Using micron-sized Fe_3O_4 as supporter,TiO_2/SiO_2/Fe_3O_4 coated particles were prepared by an improved sol-gel process.Their magnetic property,phase structure and morphology were characterized by means of VSM,XRD,and TEM.The photocatalytic activity of TiO_2/SiO_2/Fe_3O_4 was investigated by the photoreduction of Cr~(6+) aqueous solution.The results indicated that the TiO_2/SiO_2/Fe_3O_4 two-coated particles were composed of SiO_2 mesosphere and TiO_2 crust,and the thus prepared TiO_2/SiO_2/Fe_3O_4 showed better magnetic properties and higher photocatalytic activity than TiO_2/Fe_3O_4 without SiO_2 coating.

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Received 2008-03-15; published 2008-03-15

引用本文:

孙明;谭欣;赵林;.磁载光催化剂TiO_2/SiO_2/Fe_3O_4的制备及其性能[J]. 化学工业与工程, 2008,25(2): 104-106

SUN Ming~1,TAN Xin~.Preparation and Characterization of Magnetic Photocatalyst of TiO_2/SiO_2/Fe_3O_4[J]. Chemcial Industry and Engineering, 2008,25(2): 104-106

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