Nano compound with multilayer structure, and applications thereof

Abstract

The invention provides a nano compound with a multilayer structure, and applications thereof. The multilayer structure is composed of an inner core layer, an insolating layer, a main functional layer, and a double modified layer from inside to outside; the general structure formula of the nano compound is FeO-SiO<2>-TiO<2>-(X+FA); the inner core layer FeO is magnetic Fe3O4 or magnetic Fe2O3 or a mixture of magnetic Fe3O4 and Fe2O3; the isolating layeris SiO2; the main functional layer is TiO2; X in the double modified layer (X+FA) is one element selected from Zn, La, and Ce; FA is used for representing folic acid. The nano compound possesses magnetism, visible light responsiveness, bio specificity, and enhanced photocatalytic activity, and can be used in the photocatalysis field; steps are simple; operation is simple; and practicality is high.

Description

technical field [0001] The invention belongs to the technical fields of magnetic materials, nanometer materials and photocatalysis, and in particular relates to a multilayer structure nanocomposite and its application. Background technique [0002] Since the 1980s when Gleiter and others successfully prepared Pd, Cu, Fe and other nanoparticles by the inert gas condensation method for the first time, nanomaterials as a new material have gradually become the focus of research and development around the world. Because nanomaterials are obviously different from bulk materials and single molecules, they have unique surface effects, small size effects, quantum size effects and tunnel effects, and present many unique physical and chemical properties. Storage, papermaking, ceramics, cosmetics, catalysis, medicine, environmental protection and other fields show broad application prospects. [0003] Among them, the nanostructured semiconductor material TiO 2 It is regarded as one of...

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Problems solved by technology

[0007] After searching the literature of the prior art, it was found that the literature "preparation of magnetic photocatalyst Fe by vapor phase hydrolysis 3 o 4 / SiO 2 / TiO 2 and its photocatalytic performance" reported that the vapor phase hydrolysis method was used to obtain Fe 3 o 4 The nano-magnetic particles are the magnetic core, and the surface is covered with a layer of SiO 2 to prevent photocorrosion, and then deposit nano-titanium oxide on Fe 3 o 4 / SiO 2 Particle surface, thus preparing the core-shell structure of Fe 3 o 4 / SiO 2 / TiO 2 Composite material for photocatalytic degradation of organic pollutants; although the reported composite material introduces magnetism, it is different from the preparation method and process route of the present invention, and does not further introduce other modification components to enhance visible light responsiveness and biological specificity ( Guo Dongxue, Zong Hailun, Wu Yihong, Zhang Qinghong, Chinese Science and Technology Papers, 2014,9,6:637-641)

[0008] Literature "Photocatalytic folic acid nano-TiO 2 Complex targeting cancer cell killing effect and its interaction with biomacromolecules" proposed folic acid nano-TiO 2 The complex targets photocatalytic killing of cancer cells. Although the reported complex has folic acid targeting, it does not further introduce other modified components to achieve visible light responsiveness and magnetic targeting (Gao Xiaoya, Shanxi Medical University, Master Thesis, 2012 )