Fe_3O_4-TiO_2核-壳结构磁性纳米材料的制备及光催化性质

Preparation and photocatalytic property of magnetic Fe_3O_4-TiO_2 nanoparticles with a core-shell structure

制备了一种具有核-壳结构的Fe3O4-TiO2磁性纳米粒,并研究其光催化性质。在表面活性剂存在的条件下,采用金属盐共沉淀法制备氧化铁纳米粒,并在其表面包覆二氧化钛外层,形成具有壳-核结构的磁性纳米粒子。利用透射电镜和扫描电镜技术对其形貌进行表征,以罗丹明B作为模型分子对其光催化性质进行研究。制得的Fe3O4-TiO2纳米粒在常温下具有磁性,可从溶液中通过永久磁铁对富集于纳米粒的有机分子或药物进行简单而有效的分离,并且对罗丹明B分子具有良好的光催化作用,有望作为有机分子或药物富集、分离和光降解的纳米材料。

The preparation of the magnetic Fe3O4-TiO2 nanoparticles with a core-shell structure,and investigation of their photocatalytic properties are reported in this paper. The magnetic Fe3O4 nanoparticles were synthesized by co-precipitation method in the presence of the surfactant,and coated with the shell of TiO2 to form the core-shell structure of catalysts. The prepared material was characterized by the transmission and scanning electron microscopy,and the photocatalytic property was evaluated using Rhodamine B （ RB） as the model molecule. The prepared Fe3O4-TiO2 nanoparticles showed good magnetic property at room temperature under the external magnetic field,and could be separated from the solution easily and effectively. The RB molecules could be decomposed by the catalyst under the irradiation of UV light. The Fe3O4-TiO2 nanoparticles are a new type of potential nanomaterial for the separation,concentration,and decomposition of organic or drug molecules.