A fast hydrothermal preparation method of tetragonal copper bismuthate photocatalyst and its application in degrading methylene blue

Abstract

The invention discloses a method for rapidly hydrothermally preparing a tetragonal copper bismuthate photocatalyst. The method comprises the following steps: respectively preparing an acetic acid solution of bismuth nitrate pentahydrate and an ethanol solution of copper nitrate trihydrate, and then mixing the two under stirring. , and then dropwise add lye to the solution to pH=14, transfer the above mixed solution to a high pressure reactor at 90-150 ℃ for hydrothermal reaction, and then carry out centrifugal washing and vacuum drying on the obtained product to obtain the morphology of Dumbbell-shaped tetragonal copper bismuthate powder. The preparation process is simple, the reaction temperature is lower than the traditional hydrothermal method, and the preparation time is short, the synthesized powder has good crystallinity, high purity, controllable grain size, relatively uniform size, and good visible light response performance, at 650-700nm There is an obvious absorption peak at , and the methylene blue solution is degraded synergistically with H2O2 under visible light, and the degradation efficiency can reach 90% to 100% within 30 minutes.

Description

Technical field: [0001] The invention relates to the technical field of photocatalysis, in particular to a rapid hydrothermal preparation method of a tetragonal copper bismuthate photocatalyst and its application in the catalytic degradation of methylene blue under visible light Background technique: [0002] Energy shortage and environmental pollution are major challenges facing human beings at present. Photocatalysis can convert solar energy into chemical energy and electrical energy, and can directly use sunlight to degrade and mineralize various pollutants in water and air. New energy development has great potential. The core of photocatalysis is a photocatalyst. Many efficient photocatalysts such as TiO 2 The catalytic activity can only be excited under ultraviolet light (wavelength λ<420nm), only about 4% of the energy in the solar spectrum can be used, and the visible light part, which accounts for 46% of the solar spectrum, still cannot be efficiently utilized. ...

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Problems solved by technology

[0004] Commonly used physical treatment methods for printing and dyeing wastewater, such as activated carbon adsorption and chemical flocculation, only enrich organic pollutants, but cannot completely degrade organic dye molecules. Secondary pollution is likely to occur during the treatment process, and it is difficult to achieve satisfactory treatment. effect, so a more efficient way to deal with dye compounds must be explored

[0005] Using photocatalytic oxidation to degrade organic pollutants is one of the most promising development directions for treating wastewater containing methylene blue. Photocatalytic method can effectively mineralize organic pollutants, and the process is simple and will not cause secondary pollution. However, large Most semiconductor catalysts can only absorb ultraviolet light because the band gap is too wide, and cannot fully utilize sunlight, and photogenerated electrons and holes are easy to recombine. The development of efficient catalysts that respond to visible light is an effective way to deal with methylene blue pollutants.

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