Nano nickel ferrite/zinc titanate modified microporous silicon oxide as well as preparation method and application thereof

Abstract

The invention discloses nano nickel ferrite / zinc titanate modified microporous silicon oxide, the specific surface area of the nano nickel ferrite / zinc titanate modified microporous silicon oxide is 700-800m < 2 > / g, the particle size distribution range is 300-700nm, the average pore size is 1.2-1.3 nm, spherical microporous SiO2 is used as an inner core, and nano ZnTiO3 and nano NiFe2O4 are sequentially grown on the surface of the inner core in situ; the preparation method comprises the following steps: S1, synthesizing spherical microporous SiO2 by a sol-gel method; s2, depositing a ZnTiO3 precursor; s3, depositing a NiFe2O4 precursor: adding soluble ferric salt and soluble nickel salt into deionized water, stirring and dissolving, then adding sodium acetate and ZnTiO3 precursor modified microporous SiO2, stirring and dispersing, carrying out hydrothermal reaction at 130-200 DEG C for 10-18 hours, filtering and washing to obtain NiFe2O4 / ZnTiO3 precursor modified microporous SiO2; and S4, calcining. The nano nickel ferrite and the nano zinc titanate are compounded into a P-N heterojunction, so that the photocatalytic efficiency and the catalytic stability are effectively improved, and the spectral absorption range is expanded.

Description

technical field [0001] The invention belongs to the field of nanometer functional materials, and in particular relates to a nanometer nickel ferrite / zinc titanate modified microporous silicon oxide, a preparation method and an application thereof. Background technique [0002] nano-SiO 2 It is one of the new era inorganic materials with high utilization value. Its particle size is small, its specific surface area is large, and it shows specific properties compared with general materials in terms of magnetism, catalysis, optical properties, and electrical properties. received widespread attention. At present, the preparation methods of nano-SiO2 include physical methods and chemical methods. The physical methods mainly include ultra-fine pulverization machinery and combustion methods. The chemical methods mainly include chemical vapor deposition, chemical precipitation, microemulsion and sol-gel methods. nano-SiO 2 There are many fields of application, specifically in the ...

AI Technical Summary

Problems solved by technology

At present, the research on composite materials using silicon oxide, titanium oxide and titanate is the most extensive. For example, the patent application number CN201611243082.8 discloses nano-titanium dioxide-silicon dioxide composite photocatalyst and its preparation method. The application number is CN201810888339.8 The patent discloses a preparation method and photocatalyst of near-infrared responsive photocatalyst with porous silica fiber as the carrier. The patent application number is CN201810612084.2, which discloses silica / titania composite airgel particles, photo Catalyst forming composition and photocatalyst, the patent application number is CN201811484282.1, which discloses titanium dioxide / silica photocatalyst and its preparation method, but due to ZnTiO 3 The band gap is 3.65eV, TiO 2 The bandgap width is 3.2eV, and it has catalytic activity only under ultraviolet radiation, while the ultraviolet content in sunlight is only 5%, and the visible light in sunlight cannot be used, which limits its further application.

In addition, when photocatalytic materials are used in water pollution treatment and soil organic matter degradation, it is difficult to recycle, resulting in waste of resources, and excessive accumulation of photocatalytic materials will also cause environmental damage and ecosystem changes

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