Preparation method of surface-dispersed nanometer bismuth molybdate composite photocatalytic material

Abstract

The invention relates to a semiconductor material technology, and aims to provide a preparation method of a surface-dispersed nanometer bismuth molybdate composite photocatalytic material. The preparation method comprises the following steps: preparing a titanium-containing precursor solution from a polyacrylonitrile-containing mixture, preparing titanium-containing fibers by using an electrostatic spinning device, drying, and calcining in a muffle furnace to obtain titanium dioxide nanofibers with rough surface morphology; dispersing the titanium dioxide nanofibers in ethylene glycol of sodium molybdate dihydrate and bismuth nitrate pentahydrate and absolute ethyl alcohol, and carrying out a hydrothermal reaction; and after the reaction is finished, centrifuging, collecting, washing the obtained precipitate, and drying the precipitate to obtain the product. A surface-dispersed nanometer heterojunction is beneficial to the simultaneous utilization of visible light by titanium dioxide and bismuth molybdate to form a two-photon excited catalytic system. Bismuth molybdate nanoparticles grow on the surface of the titanium dioxide coarse fibers in a dispersed mode to form a three-dimensional hierarchical structure, light can be fully utilized by inducing multiple reflections of visible light, meanwhile, the high specific surface area is kept, active sites are increased, and adsorption and photochemical reactions are promoted.

Description

technical field [0001] The invention relates to the preparation of semiconductor materials, in particular to a method for preparing a surface-dispersed nano-bismuth molybdate composite photocatalytic material. Background technique [0002] Semiconductor photocatalysis technology can convert solar energy into electrical energy and chemical energy, and has very broad application prospects in the fields of energy and the environment. Traditional photocatalytic materials represented by titanium dioxide have the advantages of low cost, strong oxidation ability, high stability and no secondary pollution, and have been widely used. However, since titanium dioxide is a semiconductor with a wide bandgap (bandgap width of 3.2eV), only ultraviolet light can excite titanium dioxide to produce photocatalytic activity, which limits the utilization of solar energy. Therefore, exploring new narrow-bandgap semiconductors is the focus of current research in the field of photocatalysis, and m...

AI Technical Summary

Problems solved by technology

In addition, in view of the existing problems of photogenerated electron-hole recombination and low quantum efficiency in single bismuth molybdate, there are also researches on the modification of bismuth molybdate by means of doping, semiconductor compounding and other technical means to explore the modification of bismuth molybdate. New technologies and methods are an important direction of current research

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