Compound photocatalyst and preparation method and application thereof

Abstract

The invention discloses a compound photocatalyst and a preparation method and application thereof. The compound photocatalyst is formed by compositing metal oxide and quantum dot materials, wherein the metal oxide accounts for, by mass, 80%-99.99% of the photocatalyst, and the quantum dot materials account for, by mass, 0.01%-20% of the photocatalyst, zinc oxide or titanium oxide serves as the metal oxide, and graphene quantum dots serve as the quantum dot materials. The preparation method includes the steps of sequentially conducting stirring, mixing, ultrasonic processing and drying on the metal oxide and the quantum dot materials. The photocatalyst can absorb full-wave-band light of sunlight and can improve the photoelectric conversion efficiency; meanwhile, the photocatalyst can restrain compositing of carriers and comprehensively improve the photocatalytic efficiency; compared with photocatalysts of other types, the photocatalyst has higher catalysis efficiency and a higher catalysis speed for decomposers; the sunlight is more sufficiently and comprehensively used, and the compound photocatalyst has the advantages of being low in price and easy to obtain.

Description

technical field [0001] The invention relates to a photocatalyst and its preparation method and application, in particular to a composite photocatalyst and its preparation method and application. Background technique [0002] Photocatalytic technology has important applications in photocatalytic environmental purification, photocatalytic water splitting to produce hydrogen, and photocatalytic conversion of carbon dioxide into renewable fuels. Photocatalytic materials must have a simple synthesis process and stable chemical properties if they want to be widely used. In recent years, the use of photocatalytic technology to degrade dye wastewater has become a research hotspot. Photocatalytic technology has the advantages of non-toxic, harmless, low cost, high activity, easy operation and reusable. At the same time, this technology can effectively destroy many biologically stable structures. Compared with traditional water treatment technology, refractory pollutants have obvious...

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Problems solved by technology

[0006] Neither of the above two patent documents discloses the formula of the composite photocatalyst, and the composite photocatalyst has the disadvantages of low light utilization efficiency, easy recombination of photogenerated electrons and holes, and the need for noble metals as cocatalysts.

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