Method for preparing three-dimensional bismuth ferrite visible light catalytic material by using direct-write forming technology

Abstract

The invention provides a method for preparing a three-dimensional bismuth ferrite visible light catalytic material by using a direct-write forming technology. The method comprises the following steps: providing and dissolving ferric nitrate, bismuth nitrate, nitric acid and potassium hydroxide into a mixed solution, and preparing bismuth ferrite nano powder through a hydrothermal synthesis method; after mixing the bismuth ferrite nano powder with an additive, adding the mixture into deionized water, and preparing bismuth ferrite mixed slurry of which the solid phase content is 40 to 80 wt percent; pre-designing a three-dimensional structural drawing through CAD (Computer Aided Design) software, converting the three-dimensional drawing into a code language capable of being recognized by a computer, putting the bismuth ferrite mixed slurry in a forming needle cylinder, enabling the forming needle cylinder to move along a path designated by the computer under the driving of a direct-write platform, extruding and forming layer by layer at the same time, periodically overlaying back and forth, and forming a mult-layer ordered three-dimensional porous structure blank; carrying out pre-sintering and sintering thermal treatment on the three-dimensional porous structure blank, thus obtaining a three-dimensional bismuth ferrite body having a visible light photocatalysis characteristic.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic material preparation, and in particular relates to a method for preparing a three-dimensional bismuth ferrite visible photocatalytic material by direct writing molding technology. Background technique [0002] The rapid development of modern social economy has brought environmental problems such as water pollution to human beings. In order to better purify water sources and protect the environment, the research on catalysts for degrading water pollutants or microorganisms has received extensive attention. In the field of photocatalysis, Fujishima and Honda first proposed the use of titanium dioxide (TiO 2 ) as a catalyst, the H 2 O decomposes into H 2 and O 2 . TiO 2 Due to the advantages of non-toxicity, stable properties, low price, good chemical corrosion resistance and degradation performance, it has been widely used. However, TiO 2 It can only be catalyzed efficiently under the ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a three-dimensional bismuth ferrite visible light catalytic material by direct writing molding technology, aiming to solve the problem that the specific surface area of ​​bismuth ferrite catalyst powder or film used for visible light catalysis is limited, and the prior art has no Problems in the Study of Bismuth Oxide Three-Dimensional Stereocatalyst

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