CuCrO2/TiO2 composite photocatalyst and preparation method thereof

A technology of catalyst and composite light, which is applied in the field of photocatalysis, can solve the problems of catalyst fixation and recovery difficulties, and achieve the effect of solving catalyst solidification, improving photocatalytic efficiency, and promoting separation

Active Publication Date: 2015-03-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a composite photocatalyst in the form of a thin film and its preparation method in view of the above-mentioned deficiencies in the prior art.

Method used

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  • CuCrO2/TiO2 composite photocatalyst and preparation method thereof
  • CuCrO2/TiO2 composite photocatalyst and preparation method thereof
  • CuCrO2/TiO2 composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] CuCrO was dispersed by ultrasonic dispersion 2 Nanocrystals (10-20nm) are uniformly dispersed in absolute ethanol, and configured as a dispersion with a concentration of 0.10g / L, and TiO 2 The nanorod array film (6 μm) was used as the substrate, and the composite photocatalyst was prepared by spin-coating method: use a pipette to take 0.15 mL of CuCrO 2 The dispersion liquid is uniformly drip-coated on the film substrate, and spin-coated at 1000 rpm for 20 seconds. After the sample is naturally dried, the next spin-coating is performed until the spin-coating is completed 15 times. Then put the sample in a muffle furnace, heat treatment at 500°C for 5 hours under the protection of Ar atmosphere at a heating rate of 5°C / min, and then cool with the furnace to obtain CuCrO 2 / TiO 2 composite photocatalyst.

[0025] The photocatalyst performance test was carried out on the photocatalyst prepared in this example. The specific process was as follows: select methylene blue (...

Embodiment 2

[0027] CuCrO was dispersed by ultrasonic dispersion 2 Nanocrystals (10-20nm) are uniformly dispersed in absolute ethanol, and configured as a dispersion with a concentration of 0.50g / L, and TiO 2 The nanorod array film (2 μm) was used as the substrate, and the composite catalyst was prepared by spin-coating method: use a pipette to take 0.15 mL of CuCrO 2 The dispersion liquid is uniformly drip-coated on the film substrate, and spin-coated at a speed of 5000 rpm for 20 seconds. After the sample is naturally dried, the next spin-coating is performed until the spin-coating is completed 5 times. Then put the sample in a muffle furnace, heat treatment at 500°C for 1 hour under the protection of Ar atmosphere at a heating rate of 5°C / min, and then cool with the furnace to obtain CuCrO 2 / TiO 2 composite photocatalyst.

[0028] Such as figure 1 Shown is the CuCrO prepared by this embodiment 2 / TiO 2 Composite photocatalyst and blank sample (TiO 2 Nanorod array film) compariso...

Embodiment 3

[0030] CuCrO was dispersed by ultrasonic dispersion 2 Nanocrystals (10-20nm) are uniformly dispersed in absolute ethanol, and configured as a dispersion with a concentration of 1.0g / L, and TiO 2 The nanorod array film (2 μm) was used as the substrate, and the composite catalyst was prepared by spin-coating method: use a pipette to take 0.15 mL of CuCrO 2 The dispersion liquid is uniformly drip-coated on the film substrate, and spin-coated at a speed of 5000 rpm for 20 seconds. After the sample is naturally dried, the next spin-coating is performed until the spin-coating is completed 5 times. Then the spin-coated sample was placed in a muffle furnace, heat-treated at 300°C for 1 hour at a heating rate of 5°C / min, and then cooled with the furnace to obtain CuCrO 2 / TiO 2 composite photocatalyst. Its photocatalytic performance was characterized, and its 8h degradation rate was 81.1%. Such as figure 2 Shown is the CuCrO prepared in this embodiment 2 / TiO 2 The field emissi...

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Abstract

The invention relates to a CuCrO2 / TiO2 composite photocatalyst. The CuCrO2 / TiO2 composite photocatalyst is prepared by the following steps of depositing CuCrO2 nanocrystals on a TiO2 nanorod array film by using a spinning method or a dipping method so as to obtain a CuCrO2 / TiO2 composite film, and then carrying out thermal treatment on the CuCrO2 / TiO2 composite film so as to obtain the CuCrO2 / TiO2 composite photocatalyst. The photocatalyst prepared by the method provided by the invention can solve the problems of catalyst curing, recycling difficulty and the like, meanwhile can develop the advantages of the p-n junction; the recombination of a current carrier can be inhibited effectively under the effect of establishing an electric field in the p-n junction; the separation of a photon-generated current carrier can be improved; the quantum efficiency can be improved, and further the photocatalysis efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, in particular to a CuCrO 2 / TiO 2 Composite photocatalyst and preparation method thereof. Background technique [0002] Since Professor Fujishima first reported TiO in 1972 2 After more than 40 years of development after the phenomenon of photolysis of water, TiO 2 、Cu 2 O, CuO, ZnO, WO 3 Such catalysts have made great progress in the photocatalytic removal of water and gas phase organic and inorganic pollutants. TiO 2 Because of its non-toxic and harmless, cheap and easy to obtain, high photocatalytic activity, good stability and other advantages, it is considered to be the photocatalyst with the most development prospects and application potential. has been widely used. But TiO 2 As a photocatalyst, it also has its own limitations. For example, its forbidden band width is 3.2eV, and it can only absorb ultraviolet light with a wavelength less than 387nm; the quantum efficiency is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/86C02F1/32
CPCY02W10/37
Inventor 赵修建常海梅熊德华
Owner WUHAN UNIV OF TECH
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