Self-assembled high-efficiency photocatalyst and preparation method and application thereof
A photocatalyst and self-assembly technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problem of low photocatalytic efficiency, achieve high photoelectric conversion efficiency, improve efficiency, The effect of increasing activity
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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 Figure 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) Ph...
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