TiO_2/磁性膨胀石墨的制备及性能研究

Preparation and Properties of Titanium Dioxide Coated Magnetic Exfoliated Graphite

采用溶胶-凝胶法在膨胀石墨表面负载镍铁氧体与TiO2,制备了TiO2/磁性膨胀石墨。采用XRD、SEM及EDS研究产物的晶相组成与颗粒群特征,测试了TiO2/磁性膨胀石墨对柴机油的吸附性能,采用VSM和紫外分光光度计分析了TiO2/磁性膨胀石墨的磁性能及对亚甲基蓝/甲基橙的光催化降解效果。实验结果表明:铁氧体与TiO2以颗粒形式在膨胀石墨表面与内孔中均匀沉积,对膨胀石墨多孔结构影响不大;TiO2/磁性膨胀石墨具有磁性、吸附油污性与光催化降解性能。TiO2/磁性膨胀石墨的比饱和磁化强度为4.7 emu/g;质量吸油率达17.2 g/g;90 min对亚甲基蓝的紫外光降解率为34%,60 min对甲基橙的紫外光降解率为55%。

Titanium dioxide coated magnetic exfoliated graphite（TMEG） was prepared with sol-gel method by depositing nickel ferrite and titanium dioxide on exfoliated graphite.The crystalline structure and particle character of the samples were studied by XRD,SEM and EDS.The adsorption abilitity to diesel oil of TMEG and polymer oil absorber felt was compared.VSM was used to analyze the magnetic property of the samples.The effect on the adsorption and photocatalytic degradation properties of TMEG to methylene blue /methyl orange dye were tested by ultraviolet spectrophotometer.The results showed that nickel ferrite and titanium dioxide particles deposited equably on the surface of exfoliated graphite whose loose porous structure was not influenced too much.TMEG have magnetization,oil adsorption and photocatalytic degradation properties.The specific saturation magnetization and oil adsorption capacity of TMEG are 4.7 emu/g and 17.2 g/g respectively.The degradation of methylene blue dye treated by the samples was 34% after exposing to ultraviolet radiation for 90 minutes and that of methyl orange dye was 55% in the same condition for 60 minutes.