A kind of preparation method of bismuth-doped tin oxide/bismuth phosphate composite photocatalyst

Abstract

The invention discloses a preparation method of a bismuth-doped tin oxide / bismuth phosphate composite photocatalyst. 3 ) 3 ·5H 2 O is dissolved in dilute nitric acid solution to obtain a clear and transparent solution A. 2 SnO 3 ·4H 2 O is dissolved in deionized water to obtain solution B, and solution B is added dropwise to solution A under stirring to obtain solution C, and Na 2 HPO 4 ·12H 2 O is dissolved in deionized water to obtain solution D, and then solution D is added dropwise to solution C under stirring conditions, and deionized water is added to make the total volume of the mixed system 30 mL, and the solution is loaded into a 50 mL autoclave, The hydrothermal reaction was placed in a constant temperature oven at 180 °C for 24 hours. After the autoclave was cooled to room temperature, the reaction solution was centrifuged. After washing, it was placed in a constant temperature drying box at 60 °C and dried for 12 hours to obtain a bismuth-doped tin oxide / bismuth phosphate composite light. catalyst. The composite photocatalyst prepared by the invention has wide absorption spectrum range, stable performance, high efficiency, non-toxicity and low cost, and can be used for efficiently degrading difficult biodegradable organic pollutants.

Description

technical field [0001] The invention belongs to the technical field of synthesis of composite photocatalytic materials, and in particular relates to a preparation method of a bismuth-doped tin oxide / bismuth phosphate composite photocatalyst. Background technique [0002] With the progress of society and the continuous development of industry, the discharge of industrial wastewater has increased. Industrial wastewater has the characteristics of large amount, variety, refractory degradation and great harm. Among them, dye wastewater mainly comes from dye production and printing and dyeing factories. Due to its high chroma, it will affect the light transmission of water and threaten the normal growth of aquatic organisms. Dye wastewater has a complex composition and is difficult to degrade in the natural environment. Some of them have "carcinogenic, teratogenic, and mutagenic" effects on organisms and are more harmful. As a deep water treatment technology, photocatalytic techn...

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Problems solved by technology

SnO 2 It is a wide bandgap n-type semiconductor, which has the advantages of good thermal and chemical stability, non-toxicity, low raw material cost, high reduction potential, and good electron mobility. It is widely used in gas-sensitive materials, catalytic materials, supercapacitors, In terms of electrode materials, its band gap (Eg) is 3.6eV, and it can only absorb and utilize ultraviolet light in photocatalysis, and there are problems of high photogenerated electron-hole recombination rate and low photocatalytic efficiency.

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