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High-efficiency near-infrared light compound photocatalyst and preparation method thereof

A technology of near-infrared light and compound light, which is applied in the field of photocatalytic materials, can solve the problems of reducing photocatalytic activity, reducing the redox potential of photogenerated electrons and holes, etc.

Active Publication Date: 2015-07-15
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reduction of the forbidden band width will reduce the redox potential of photogenerated electrons and holes, and reduce the photocatalytic activity.

Method used

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  • High-efficiency near-infrared light compound photocatalyst and preparation method thereof
  • High-efficiency near-infrared light compound photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: Preparation of up-conversion luminescent material

[0020] Take 0.292g of EDTA in 10mL of ultrapure water and magnetically stir for 30min, then add a certain amount of LnCl dropwise 3 stock solution, i.e. YCl 3 (0.5M) 1.488mL, YbCl 3 (0.5M) 0.5mL, TmCl 3 (0.05M) 0.12mL, magnetically stirred for 60min, then 10mL of 16mmol NaF aqueous solution was added dropwise, magnetically stirred for 60min, the precursor was transferred to a 50mL sealed reaction kettle with a polytetrafluoroethylene liner, and placed to dry Hydrothermal reaction at 200 °C in the box for 18 hours, then naturally cooled to room temperature, and a 1:1 mixed solution of ultrapure water and absolute ethanol was passed through a desktop centrifuge for 10 hours. 4 Rpm / 10min centrifuge and wash the product 3 to 5 times, then put the precipitate in a vacuum drying oven at 80°C for 12 hours, and then put the product in a box-type atmosphere resistance furnace, in N 2 Calcined at 400°C for 90 m...

Embodiment 2

[0021] Embodiment 2: Preparation of near-infrared light composite photocatalyst

[0022] 50mg of up-conversion luminescent material and 50mg of TiO 2 (P-25) Add 50mL of absolute ethanol, ultrasonically disperse for 30min, then magnetically stir for 24h, use a 1:1 mixture of ultrapure water and absolute ethanol to pass through a desktop centrifuge for 10 4 The product was washed by centrifugation at rpm / 10min for 3 to 5 times, and then the precipitate was put into a vacuum drying oven at 80° C. for 12 hours, and ground to obtain a near-infrared composite photocatalyst.

Embodiment 3

[0023] Example 3: Performance of near-infrared light composite photocatalyst for degradation of methyl orange (MO)

[0024] Weigh 5 mg of the above-prepared near-infrared photocatalyst in 0.5 mL of 20 ppm MO, and let it stand in the dark for 12 h to reach adsorption equilibrium. Then, under the irradiation of 980nm near-infrared laser, the photodegradation experiment was carried out, and the absorbance of the solution after a certain period of degradation was measured by a spectrophotometer, and the absorbance-concentration standard curve table was checked, and the degradation rate of MO was calculated to be 53.8% after 3 hours.

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Abstract

The invention belongs to the field of photocatalytic materials, and particularly relates to a near-infrared light compound photocatalyst and a preparation method thereof. The compound photocatalyst is formed by mechanically mixing an up-conversion luminescent material beta-NaYF4: Yb<3+>, Tm<3+> and a photocatalytic material Degussa P25, wherein the up-conversion material is used for absorbing near-infrared light which is converted, so that ultraviolet light is emitted, and the utilization of near-infrared light is realized by exciting the photocatalytic activity of TiO2, and the utilization efficiency of sunlight in light-catalyzed reaction is increased. The near-infrared light compound photocatalyst can be applied to the field of light catalysis environmental management.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, and in particular relates to a near-infrared composite photocatalyst and a preparation method thereof. Background technique [0002] Since the 1970s, semiconductor photocatalyst technology has gradually developed. With the development of industry, the rapid increase of population, and the increasingly serious environmental problems, scholars from all over the world have widely carried out the application of semiconductor photocatalyst technology in the field of environmental governance. TiO 2 It is a photocatalytic material widely used in photocatalytic technology. Its main characteristics are cheap, non-toxic, high stability, recyclable, no secondary pollution, direct use of solar energy, photogenerated electrons and holes. Potential high potential, high mineralization. However, TiO 2 The bandgap E g Large, it can only absorb ultraviolet light with a wavelength less than 387nm. This...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/135C09K11/85
Inventor 付明来许东兴石建稳
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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