Molybdenum-containing semi-conductor photocatalysis material responding to visible light, preparation method and application thereof

Abstract

The invention relates to a molybdenum-containing semi-conductor photocatalysis material responding to visible light, wherein a molecular formula of the material is M2M1FeMoO6. In the formula, M1 is equal to Li, Na, K, Rb or Cs; and M2 is equal to Be, Mg, Ca, Sr or Ba. A preparation method for the material comprises the following steps that: an M1-containing compound, an M2-containing compound, an Fe-containing compound and an Mo-containing compound are placed into a mortar according to the mol ratio that the M1 to Fe to the M2 to Mo is 1: 1: 1: 1, and are ground and mixed evenly; and the mixture is subjected to presintering treatment the temperature is increased to be between 800 and 1,200 DEG C, and the mixture is at a constant temperature for 1 to 160 hours to obtain the molybdenum-containing semi-conductor photocatalysis material responding to the visible light. The material has low energy band gap, has good absorption under the irradiation of the visible light, and can be used for performing full spectrum absorption on solar light, or is used for removing harmful substances in the air and sterilizing under the irradiation of the visible light, or is used as a photoelectric conversion material, or is used for producing hydrogen and oxygen by performing photocatalytic analysis on water, or is used for removing organic substances which are harmful to people in sewage by the degradation. The material has the advantages of low synthesis cost, and simple and easy method.

Description

technical field [0001] The field of the invention belongs to the field of new materials, and also belongs to the field of environment-friendly materials; in particular, it relates to a molybdenum-containing semiconductor photocatalytic material responsive to visible light, its preparation method and application. Background technique [0002] TiO with relatively stable physical and chemical properties 2 Although there are many studies on photocatalytic degradation of organic pollutants and decomposition of hydrogen, the main problem is that due to the 2 The energy band structure of solar energy determines that it can only absorb the ultraviolet part of sunlight, and can hardly absorb visible light, while the energy in the visible range of sunlight with a wavelength of 400-750nm that irradiates the earth's surface accounts for 43% of the total solar energy, while the wavelength of 400nm The following UV is less than 5%, so this leads to the use of TiO 2 The efficiency of abs...

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Problems solved by technology

[0002] TiO with relatively stable physical and chemical properties 2 Although there are many studies on photocatalytic degradation of organic pollutants and decomposition of hydrogen, the main problem is that due to the 2 The energy band structure of solar energy determines that it can only absorb the ultraviolet part of sunlight, and can hardly absorb visible light, while the energy in the visible range of sunlight with a wavelength of 400-750nm that irradiates the earth's surface accounts for 43% of the total solar energy, while the wavelength of 400nm The following UV is less than 5%, so this leads to the use of TiO 2 The efficiency of absorbing sunlight is too low

[0004] Searching for new photocatalytic materials that respond to visible light is the current frontier of photocatalytic research in the world, but most of the work focuses on the modification of titanium dioxide. In the early stage of research, TiO 2 The dream of redshifting to visible light is focused on metal ion doping or compounding with other metal oxide semiconductors. After more than two decades of research, it has finally been proved that although the modification of cations can reduce the TiO 2 band gap, but at the same time it will significantly reduce the photon quantum efficiency, because the doped metal ions themselves become electron-hole recombination sites

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