Method for preparing Z-shaped photocatalytic material bismuth vanadate-silver-silver bromide

Abstract

The invention relates to a method for preparing Z-shaped photocatalytic material bismuth vanadate-silver-silver bromide. The method comprises the following steps: firstly, dispersing bismuth vanadate microcrystals in a water solution, adding a certain quantity of silver bromide, performing stirring till silver bromide is dissolved, and performing irradiation for 3 h by use of a 300 W xenon lamp to enable in-situ reduction of silver ions on the surface of bismuth vanadate to become silver nanoparticles (a faint yellow suspension becomes grey green); then, centrifugally washing obtained sediment for three times to remove impurity ions, and performing drying to obtain bismuth vanadate-silver; and finally, dispersing bismuth vanadate-silver in the water solution, adding ferric nitrate and a potassium bromide solution, enabling reaction for 1 h, and centrifugally washing to obtain a AgBr-Ag-BiVO4 photocatalytic material. The method has the advantages that the operation is simple, reaction conditions are mild, and the preparation period is short. The prepared Z-shaped photocatalytic material can be used for degrading environmental pollutants, such as tetracycline.

Description

technical field [0001] The invention relates to a preparation method of a Z-type photocatalytic material bismuth vanadate-silver-silver bromide which can be used for degradation of environmental pollutants such as antibiotics, and belongs to the field of photocatalysis. Background technique [0002] While the rapid development of the chemical industry meets people's growing material and cultural needs, it also brings more and more serious environmental pollution. In the 21st century, the problem of global environmental pollution has become increasingly prominent, which has seriously threatened the survival and development of human beings, and has become a bottleneck restricting the sustainable development of countries all over the world. How to solve the increasingly serious environmental pollution and energy shortage problems has become the top priority of the governments of all countries and needs to be solved urgently. [0003] Since Fujishima and Honda discovered in the...

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Problems solved by technology

However, the band gap (3.2 eV) of titanium dioxide determines that it can only absorb ultraviolet light below 400 nm, and the ultraviolet light in the solar spectrum that reaches the earth's surface only accounts for 3~5%, which causes titanium dioxide to be sensitive to sunlight. The utilization efficiency is extremely low, and its photon quantum efficiency is low, and there is serious recombination, which hinders its practical application

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