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Bismuth and silicon doped nano titanium dioxide photocatalyst, preparation and application thereof

A nano-titanium dioxide and photocatalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of easy recombination of photogenerated electrons and holes, and low photon efficiency. , instability and other problems, to achieve high-efficiency visible light degradation efficiency, more acid points on the surface, and the effect of preventing grain growth

Active Publication Date: 2014-01-08
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using Bi alone 2 o 3 As a photocatalyst, there are two major defects: one is that the photogenerated electrons and holes are easy to recombine, and the photon quantum efficiency is low; the other is that Bi 2 o 3 Unstable during the reaction, probably by Bi 2 o 3 into bismuth oxycarbonate (Bi 2 o 2 )CO 3

Method used

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  • Bismuth and silicon doped nano titanium dioxide photocatalyst, preparation and application thereof
  • Bismuth and silicon doped nano titanium dioxide photocatalyst, preparation and application thereof
  • Bismuth and silicon doped nano titanium dioxide photocatalyst, preparation and application thereof

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Experimental program
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Effect test

Embodiment 1

[0028] Measure 50ml of 0.02 mol / L bismuth nitrate and 50ml of 0.1 mol / L ethyl orthosilicate in absolute ethanol in the reactor, add nitric acid solution to adjust the pH to 2, stir well to obtain a mixed solution; stir at room temperature 100ml 2mol / L tetrabutyl titanate solution in absolute ethanol is slowly added dropwise to the above mixed solution, a white precipitate will appear at the beginning, after the dropwise addition, continue to stir for 10 hours to make the tetrabutyl titanate further Hydrolyze to obtain a monodisperse sol; then dry the sol at 90°C for 8 hours to remove ethanol and water to obtain a xerogel, and calcinate at 450°C for 1.5 hours to obtain a light yellow bismuth and silicon co-doped nano-titanium dioxide photocatalyst, in mole fraction Calculated, the doping amount of bismuth is 0.4%, and the doping amount of silicon is 4.8%.

[0029] figure 1 It is the transmission electron microscope photograph of this sample, it can be seen that the sample par...

Embodiment 2

[0031] Measure 50ml of 0.04 mol / L bismuth nitrate and 50ml of 0.2 mol / L ethyl orthosilicate in absolute ethanol in the reactor, add nitric acid solution to adjust the pH to 1.5, stir well to obtain a mixed solution; stir at room temperature Add 200ml of 1mol / L tetrabutyl titanate solution in absolute ethanol dropwise to the above mixed solution, and continue stirring for 8 hours after the dropwise addition to obtain a monodisperse sol; dry the obtained sol at 90°C for 9 hours to dry The gel was calcined at 500°C for 2 hours to obtain a light yellow bismuth-silicon co-doped nano-titanium dioxide photocatalyst. In terms of mole fraction, the doping amount of bismuth was 0.9%, and the doping amount of silicon was 7.6%.

[0032] The X-ray diffraction pattern of the bismuth and silicon co-doped nano-titanium dioxide photocatalyst synthesized in this embodiment shows that its crystal phase is anatase phase, and a certain red shift has taken place in the ultraviolet-visible absorption...

Embodiment 3

[0035] Measure 50ml of 0.01 mol / L bismuth acetate and 50ml of 0.3 mol / L sodium silicate in absolute ethanol in the reactor, add nitric acid solution to it to adjust the pH to 2.5, and stir to obtain a mixed solution; stir 100ml at room temperature Add 2 mol / L isopropyl titanate absolute ethanol solution dropwise to the above mixed solution, and continue stirring for 10 hours after the dropwise addition to obtain a monodisperse sol; dry the obtained sol at 100°C for 8 hours to obtain a xerogel , Calcined at 500°C for 2 hours to obtain a light yellow bismuth and silicon co-doped nano-titanium dioxide photocatalyst, in terms of mole fraction, the doping amount of bismuth was 0.2%, and the doping amount of silicon was 12.1%.

[0036] The X-ray diffraction pattern of the bismuth and silicon co-doped nano-titanium dioxide photocatalyst synthesized in this embodiment shows that its crystal phase is anatase phase, and the ultraviolet-visible absorption spectrum has a red shift to a cer...

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Abstract

The invention belongs to the nano titanium dioxide catalyst technical field, concretely relates to a bismuth and silicon doped nano titanium dioxide photocatalyst, its preparation and its application. The doping amount of bismuth in the catalyst by mole fraction is 0.2-1.1%, the doping amount of silicon is 4.8-15.6%. The bismuth and silicon doped nano titanium dioxide photocatalyst has the advantages of pure crystalline phase, high specific surface, multiple surface acidity points, visible light response and organic pollutant adsorption. The catalyst of the invention can be rapidly degraded by using visible light and sunshine, so that the catalyst keeps high visible photodegradation efficiency and high photocatalytic activity.

Description

technical field [0001] The invention belongs to the technical field of nano-titanium dioxide catalysts, in particular to a bismuth-silicon co-doped nano-titanium dioxide photocatalyst and its preparation and application. Background technique [0002] Chlorophenol compounds are widely used in wood preservatives, rust inhibitors, fungicides and herbicides, etc. In addition, the tail water of biological treatment of urban sewage and industrial wastewater also contains chlorophenol compounds, which are extremely toxic and widely distributed Environmental pollutants, and the metabolic reaction of chlorophenols in nature can produce more toxic polychlorinated dioxins. The United States, China and other countries have included it in the list of priority pollutants. [0003] At present, the photocatalytic method is widely used in the treatment of chlorophenol pollutants. As a photocatalyst, titanium dioxide has the advantages of stable chemical properties, cheap and easy to obtain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/18C02F1/30C02F1/32
CPCY02W10/37
Inventor 杨娟戴俊李建通
Owner HENAN POLYTECHNIC UNIV
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