Preparation method for magnetic nanometer microballoon photocatalysis composite materials

Abstract

The invention relates to a preparation method for magnetic nanometer microballoon photocatalysis composite materials. The preparation method includes steps of (1) preparing Fe3O4 magnetic nanometer particles; (2) preparing Fe3O4 / SiO2 coating magnetic nanometer microballoons from the Fe3O4 magnetic nanometer particles by the aid of a steam phase method; (3) adding the Fe3O4 / SiO2 coating magnetic nanometer microballoons into absolute ethyl alcohol, adding tetra-n-butyl titanate under ultrasonic treatment, transferring solution into a steam phase device to be used as solid phase after continuous ultrasonic treating, and staying the solution at the temperature ranging from 100 DEG C to 200 DEG C for 8 hours to 14 hours; washing and separating solid phase products; and finally drying the solid phase products in a vacuum manner, so that the magnetic nanometer microballoon photocatalysis composite materials are obtained. The preparation method is simple in operation and low in cost, and can realize scale production. The obtained magnetic nanometer microballoon photocatalysis composite materials are high in magnetic particle content, large in saturation magnetic moment and fine in photocatalytic performance, and dye molecules for simulating pulmonary edema, such as acid red, methylthionine chloride and the like, can be effectively degraded.

Description

technical field [0001] The invention belongs to the field of preparation of photocatalytic composite materials, in particular to a preparation method of magnetic nano-microsphere photocatalytic composite materials. Background technique [0002] The vapor phase method (Vapor phase method) is a method for the synthesis of microporous molecular sieves proposed by Xu et al. in 1991, and later some scholars used it for the synthesis of molecular sieve membranes [H.B.Zhao, T.Jin, K.Kuraoka, T. .Yazawa.A novelmethod for the synthesis of ZSM-5zeolite membranes on a porous aluminum tube: the role of adry-gel barrier in pores, Chemical Communications, 2000, 1621~1622]. The difference between the vapor phase method and the most commonly used hydrothermal synthesis method is that the reactants are divided into two phases that are not in direct contact. The liquid phase is generally composed of water and volatile organic compounds, and the two phases are gently generated by heating and o...

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Problems solved by technology

Although there are some reports on magnetic photocatalysts, the existing problems mainly include: (1) some works have selected large-particle magnetic cores, resulting in poor suspension of the catalyst in the liquid phase, such as: Lee et al. The above magnetic BaFe 12 o 19 Particles as the core, BaFe was prepared using butyl titanate as the titanium source 12 o 19 / SiO 2 / TiO 2 Magnetic catalyst, which needs to be calcined at 500°C to crystallize titanium dioxide into anatase phase [Seung-woo Lee, et al. Synthesis and characterization of hard magnetic composite photocatalyst-Barium ferrite / silica / titania, Materials Chemistry and Physics, 2006, 96, 483-488], while the magnetic particles themselves are darker in color, and the large magnetic cores will also reduce the use of light by the material.

(2) Titanium dioxide-coated magnetic particles were prepared by sol-gel, but before calcination, titanium dioxide was an amorphous structure without photocatalytic activity, such as: Fu et al prepared TiO 2 / SrFe 12 o 19 Magnetic photocatalysts, which require crystallization of titanium dioxide at 400 °C or higher [Wuyou Fu et al. Anatase TiO 2 nanolayer coating on strontium ferrite nanoparticles for magnetic photocatalyst, Colloids and Surfaces A: Physicochem.Eng.Aspects, 2006, 289, 47-52], but the work of Beydoun et al. showed that calcination to make titanium dioxide and magnetic materials better ohmic contact will promote the photogenerated loading The recombination of flow particles leads to the reduction of photocatalytic activity, and also accelerates the photocorrosion of magnetic materials [Donia Beydoun et al.Novel Photocatalyst: Titania-Coated Magnetite.Activity and Photodissolution, J.Phys.Chem.B2000, 104, 4387-4396]

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