Preparation method of silver phosphate/metal oxide composite photocatalyst capable of efficiently degrading tetracycline

Abstract

The invention discloses a preparation method of a silver phosphate / metal oxide composite photocatalyst capable of efficiently degrading tetracycline, and belongs to the field of photocatalysis and inorganic nano materials. According to the preparation method disclosed by the invention, silver phosphate is grown on the surface of a metal oxide, so that the problem that silver phosphate nano particles are agglomerated easily can be effectively solved, and dispersibility of the silver phosphate nano particles is improved. A heterojunction formed by a special structure of the metal oxide and the silver phosphate with narrow band gaps can enhance separation efficiency of a photo-generated carrier, so that light corrosion of silver phosphate can be effectively inhibited, and stability of the catalyst is improved. The specific surface area and rich surface active sites of the metal oxide are beneficial to adsorption of pollutants onto the surface of the catalyst, so that photocatalytic activity is further improved. The prepared silver phosphate / metal oxide composite photocatalyst can efficiently degrade tetracycline under simulated sunlight, and has a good application value in the aspectof environmental pollution remediation. The preparation method disclosed by the invention is simple and feasible, cost is low, reaction conditions are easy to control and the preparation method is suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of photocatalysis and inorganic nanometer materials, in particular to a method for preparing a silver phosphate / metal oxide composite photocatalyst for efficiently degrading tetracycline. Background technique [0002] In recent years, with the rapid development of the pharmaceutical industry, the use of antibiotics in my country has increased significantly. Tetracycline, as a typical antibiotic, is difficult to metabolize after being ingested by the human body. Most of them are excreted in the form of parent compounds. Biosecurity poses a great potential threat. [0003] At present, the treatment of environmental residues of tetracycline has become a hot research topic at home and abroad. As a "green" technology, semiconductor photocatalysis has attracted extensive attention in the field of organic pollutant degradation because of its availability of solar energy, wide application range, easy operation, green environm...

AI Technical Summary

Problems solved by technology

TiO made by CN104941621A 2 / GO composite photocatalyst has a degradation rate of 65% for tetracycline under ultraviolet light irradiation, and its catalytic activity and spectral response range need to be further improved

CN107930615A synthesized a kind of Bi 4 V 2 o 11 / RGO heterojunction composite photocatalyst, the maximum degradation rate of tetracycline under visible light is 70%, CN106179372A synthesized a C@Fe 3 o 4 @Bi composite photocatalyst is used to catalyze the degradation of tetracycline under visible light, and the degradation rate is about 72%. 2 The degradation rate of nanotubes to tetracycline under simulated sunlight is 71.28%. Although the catalytic activity of these composite photocatalysts has been improved, the preparation process is cumbersome, which is not conducive to continuous production.

At present, the preparation method of composite photocatalyst materials based on silver phosphate and metal oxides has not been reported yet.

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