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A self-assembled high-efficiency photocatalyst and its preparation method and application

A photocatalyst and self-assembly technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical elements of heterogeneous catalysts, etc., can solve the problem of low photocatalytic efficiency and achieve high photoelectric conversion efficiency, stable properties, The effect of improving efficiency

Active Publication Date: 2019-07-02
LIAONING UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In order to solve the nano-NaTaO 3 As an important catalyst for photocatalytic decomposition of water to produce hydrogen, the photocatalytic efficiency is not high, and it can only absorb less than 4% of the ultraviolet light in sunlight. The present invention provides an up-conversion ultraviolet luminescent material (Y 2 SiO 5 :Pr 3+ , Li) and nanophotocatalyst (NaNb x Ta 1-x o 3 ) combined with a self-assembled high-efficiency photocatalyst loaded with noble metal Pt at the same time, the catalyst can greatly improve the efficiency of photocatalytic hydrolysis hydrogen production

Method used

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  • A self-assembled high-efficiency photocatalyst and its preparation method and application
  • A self-assembled high-efficiency photocatalyst and its preparation method and application
  • A self-assembled high-efficiency photocatalyst and its preparation method and application

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Embodiment 1

[0036] Embodiment 1 self-assembled high-efficiency photocatalyst Y 2 SiO 5 :Pr 3+ ,Li / Pt-NaNb x Ta 1-x o 3

[0037] (1) Self-assembled high-efficiency photocatalyst Y 2 SiO 5 :Pr 3+ ,Li / Pt-NaTaO 3 (x=0)

[0038] (1) Up-conversion ultraviolet luminescent material Y 2 SiO 5 :Pr 3+ , the preparation of Li nanopowder

[0039] Take (2.9308g) Y 2 o 3 powder and (0.05972g) Pr 6 o 11 Add the powder into excess concentrated nitric acid, heat and stir with magnetic force until it is colorless and transparent, and evaporate excess concentrated nitric acid. Take (0.6048g) LiNO 3 , (10mL) ethanol and (4mL) distilled water were added to the above solution, and then (4.0mL) tetraethoxysilane was added, magnetically stirred at room temperature for 10min, then heated to 70°C, heated and stirred until the solution became a transparent gel, Put the transparent gel into an oven, heat it at a constant temperature of 104°C for 17 hours, and dry it to obtain a dry gel. Heat and ca...

Embodiment 2

[0073] Example 2 self-assembled high-efficiency photocatalyst Y 2 SiO 5 :Pr 3+ ,Li / Pt-NaNb x Ta 1-x o 3 Application in photocatalytic hydrolysis hydrogen production

[0074] (1) Effect of light time on photocatalytic water splitting for hydrogen production

[0075] Experimental conditions: 200mg of Pt-NaTaO 3 (the loading of platinum is 0.25%) nanopowder, Y of 280mg 2 SiO 5 :Pr 3+ ,Li / Pt-NaNb x Ta 1-x o 3 (x=0,0.25,0.5)(Y 2 SiO 5 :Pr 3+ , Li and NaNb x Ta 1-x o 3The mass ratio is 3:7, the platinum loading is 0.25%) nanopowder and 500mL methanol aqueous solution (10%). At a temperature of 25°C and a pressure of 101325Pa, four 105W three-color (red, yellow, green) lamps are used to simulate sunlight for illumination, and the illumination intensity is 10.0mW·cm -2 , Lighting time 0.0-5.0h.

[0076] The result is as Image 6 As shown, with the extension of the light time, the Pt-NaTaO 3 with Y 2 SiO 5 :Pr 3+ ,Li / Pt-NaNb x Ta 1- x o 3 (x=0,0.25,0.5) Pho...

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Abstract

The invention discloses a self-assembled high-efficiency photocatalyst and a preparation method and application thereof. The self-assembled high-efficiency photocatalyst Y2SiO5: Pr<3+>, Li / Pt-NaNbxTal-xO3 is prepared by sol-gel and hydrothermal synthesis methods. The prepared novel self-assembled high-efficiency photocatalyst has the advantages that the property is stable, the high temperature-resistant property is realized, and the water decomposing for hydrogen production efficiency under the visible light radiation condition is greatly improved, so as to provide an effective path for the large-scale solar photocatalysis water decomposing for hydrogen production.

Description

technical field [0001] The invention belongs to the field of hydrogen production by photocatalytic hydrolysis, and in particular relates to an up-conversion luminescent material (Y 2 SiO 5 :Pr 3+ , Li) and nano-hybrid perovskite (NaNb x Ta 1-x o 3 ) combined with a self-assembled high-efficiency photocatalyst that simultaneously supports noble metal platinum (Pt), its preparation method and its application in photocatalytic hydrolysis for hydrogen production. Background technique [0002] In recent years, the global energy demand has continued to grow, and the contradiction between supply and demand has further deteriorated. Conventional energy such as coal, oil, and natural gas is currently the most important energy consumed in the world, but a large amount of greenhouse gas CO will be added in the process of use. 2 , At the same time, some polluting smoke may be produced, threatening the global ecology. On the other hand, with the continuous mining of human beings, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/648C01B3/04
CPCB01J23/002B01J23/6486B01J35/004B01J2523/00C01B3/042C01B2203/107B01J2523/12B01J2523/56B01J2523/57Y02E60/36
Inventor 王君宋亚慧刘逸伦张朝红吴琼韦胜男荣洋宋有涛
Owner LIAONING UNIVERSITY
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