Large-area Z-type heterojunction porous carbon nitride/cadmium selenide composite light catalyst and preparation method thereof

Abstract

The invention discloses a preparation method of a large-area Z-type heterojunction porous carbon nitride / cadmium selenide composite light catalyst. The method comprises the following steps that 1, blocky carbon nitride is added into a solvent, ultrasonic dispersion is performed for a certain period of time, then, dispersed precipitates are washed, centrifuged and dried to obtain ultra thin porouscarbon nitride nano sheets; 2, firstly, the ultra thin porous carbon nitride nano sheets obtained in step 1 are dispersed into a solvent, then, cadmium salt and selenium compounds are added into the dispersing solution, after stirring is performed for a period of time, the mixture is transferred into a high-pressure reactor containing a teflon liner, after a hydrothermal reaction is performed fora period of time, precipitates are centrifuged, washed and dried to obtain the composite light catalyst. The light catalyst has the advantages that the preparation method is simple, raw materials areeasy to obtain and cheap, the yield is high, the light catalysis carbon dioxide reduction performance is high and the light resisting corrosion performance is high, and the wide prospect is achieved in application in the field of light catalysis.

Description

technical field [0001] The invention belongs to the field of environmental protection and energy materials, and in particular relates to a large-area Z-type heterojunction porous carbon nitride / cadmium selenide composite photocatalyst and a preparation method thereof. Background technique [0002] Due to the massive consumption of fossil fuels such as coal, oil and natural gas, the emission of greenhouse gases mainly carbon dioxide in the atmosphere is increasing day by day. This supply and consumption of fossil fuels is obviously unsustainable. A recent report pointed out that by 2100, the amount of carbon dioxide in the atmosphere The concentration will rise to 590ppm, and the surface temperature will rise by 1.9°C, which will lead to the melting of icebergs and rising sea levels. The phenomenon brought about by this greenhouse effect is undoubtedly extremely severe. Therefore, converting a large amount of carbon dioxide into the energy needed by people such as methane, me...

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Problems solved by technology

However, the photogenerated electrons of this type-II heterojunction composite photocatalysis are biased to transfer from the more negative conduction band position to the more positive conduction band position, and the photogenerated holes are biased to transfer from the more positive valence band position to the more negative The valence band position, which can reduce the recombination efficiency of carriers but reduces the redox ability of electrons and holes, and reduces the photocatalytic activity from a thermodynamic point of view.

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