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Photocatalyst material for absorbing full sunlight spectrum and preparation method thereof

A photocatalyst and full-spectrum technology, which is applied in the direction of luminescent materials, chemical instruments and methods, physical/chemical process catalysts, etc., to improve the photocatalytic effect, improve the utilization rate, and solve the effect of low quantum efficiency

Inactive Publication Date: 2017-09-22
HEFEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, photocatalysts represented by semiconductors such as titanium dioxide and cuprous oxide have been widely studied and applied by people. Their advantages such as simple preparation methods, low-cost raw materials used, environmental protection, and superior photocatalytic performance have been favored by scientists for a long time. However, based on the wide band gap of these semiconductors, the electrons in the full band can only be excited to the conduction band by the ultraviolet light in the sunlight, and the actual ultraviolet light irradiating the earth accounts for only about 5%, and the remaining about 49% % of visible light and 46% of near-infrared light cannot be absorbed and utilized

Method used

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  • Photocatalyst material for absorbing full sunlight spectrum and preparation method thereof
  • Photocatalyst material for absorbing full sunlight spectrum and preparation method thereof
  • Photocatalyst material for absorbing full sunlight spectrum and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1, preparation of up-conversion material (UC) NaYF by hydrothermal synthesis 4 :Yb,Er:

[0025] Weigh 2.519g of sodium fluoride and dissolve it in 50mL of deionized water, shake and dissolve to prepare a 1.2mol / L sodium fluoride solution. Weigh 5.8g of sodium citrate and place it in a clean beaker, add 25mL of deionized water, and dissolve it ultrasonically; then weigh 0.19g of YbCl 3 , 0.38g of YCl 3 , 0.005g ErCl 3 Add to the above solution, and stir magnetically for 30 minutes after ultrasonic dissolution; then measure 25mL, 1.2mol / L sodium fluoride solution and slowly add it to the above mixed solution, continue magnetic stirring for 10min, then transfer the mixed solution to a 60mL reaction kettle placed in an oven at 200°C for 16 hours; after the product was cooled, it was centrifuged, washed with deionized water, and then dried in a drying oven at 180°C for 18 hours; the prepared up-conversion material (UC) NaYF 4 :Yb, Er, NaYF 4 As a host material, dop...

Embodiment 2

[0033] (1) Prepare 20mg / L methylene blue solution as the degraded product for later use.

[0034] (2) Take 50mL of methylene blue solution in a beaker, and add 0.05g of catalyst, after ultrasonic dispersion, magnetically stir for 1h in the dark to ensure that the dye molecules and photocatalyst reach the adsorption-desorption equilibrium.

[0035] (3) Put the target degradation product in (2) above in a photocatalytic degradation device, and keep stirring the solution during the reaction. Take 3 mL of the reaction solution every 20 minutes and put it into a centrifuge tube for centrifugation. Take the supernatant and measure its absorption peak in a cuvette and compare the change of the absorption peak before and after degradation.

[0036] image 3 A is the above methylene blue solution in the composite UC / TiO 2 Under the photocatalytic degradation of / Ag, the characteristic peak intensity at 665nm gradually weakens with time in the ultraviolet-visible spectrum, indicating ...

Embodiment 3

[0040] Step 1, preparation of up-conversion material (UC) NaYF by hydrothermal synthesis 4 :Yb,Er:

[0041] Weigh 2.519g of sodium fluoride and dissolve it in 50mL of deionized water, shake and dissolve to prepare a 1.2mol / L sodium fluoride solution. Weigh 5.8g of sodium citrate and place it in a clean beaker, add 25mL of deionized water, and dissolve it ultrasonically; then weigh 0.19g of YbCl 3 , 0.38g of YCl 3 , 0.005g ErCl 3 Add to the above solution, and stir magnetically for 30 minutes after ultrasonic dissolution; then measure 25mL, 1.2mol / L sodium fluoride solution and slowly add it to the above mixed solution, continue magnetic stirring for 10min, then transfer the mixed solution to a 60mL reaction kettle placed in an oven at 160°C for 24 hours; after the product was cooled, it was centrifuged, washed with deionized water, and then dried in a drying oven at 160°C for 24 hours; the prepared up-conversion material (UC) NaYF 4 :Yb, Er, NaYF 4 As a host material, dop...

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Abstract

The invention provides a photocatalyst material for absorbing a full sunlight spectrum and a preparation method thereof and relates to the technical field of composite micro-nano materials. The material uses an upconversion material NaYF4: Yb,Er as a template, and the surface of the template is sequentially modified with TiO2 and Ag nanoparticles. Firstly, the upconversion material is obtained through hydro-thermal synthesis reaction, then is used as the template and is successively modified with the TiO2 and Ag nanoparticles through reduction reaction, and the UC / TiO2 / Ag composite micro-nano photocatalyst material is obtained. The photocatalyst material retains the advantage of efficiently absorbing ultraviolet and visible wavebands of high-energy excitation of a traditional photocatalyst material, meanwhile can also convert long-wave radiation of an infrared waveband in sunlight into visible waveband shortwave radiation which can be directly absorbed by the material, the sunlight utilization rate is further improved, full spectrum utilization of sunlight is achieved, and the photocatalyst material is hopeful to serve as a photocatalyst for sunlight-based efficient catalytic degradation of organic pollutants.

Description

technical field [0001] The invention relates to the technical field of preparation of composite micro-nano materials, in particular to a photocatalyst material for full-spectrum absorption of sunlight and a preparation method thereof. Background technique [0002] At present, photocatalysts represented by semiconductors such as titanium dioxide and cuprous oxide have been widely studied and applied by people. Their advantages such as simple preparation methods, low-cost raw materials used, environmental protection, and superior photocatalytic performance have been favored by scientists for a long time. However, based on the wide band gap of these semiconductors, the electrons in the full band can only be excited to the conduction band by the ultraviolet light in the sunlight, and the actual ultraviolet light irradiating the earth accounts for only about 5%, and the remaining about 49% % of visible light and 46% of near-infrared light cannot be absorbed and utilized. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135C09K11/77C02F1/30
CPCC09K11/7705C02F1/30B01J27/135C02F2305/10B01J35/393B01J35/39
Inventor 吴义平刘伟芳邓崇海杨本宏
Owner HEFEI UNIV
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