Hexagonal boron nitride modified graphitized carbon nitride composite photocatalyst and its preparation method and application

Abstract

The invention discloses a hexagonal boron nitride modified graphitized carbon nitride composite optical catalyst as well as a preparation method and application thereof. According to the composite optical catalyst, by taking graphitized carbon nitride as a carrier, laminated hexagonal boron nitride modifies the graphitized carbon nitride carrier. The preparation method comprises the following steps: mixing the hexagonal boron nitride with a graphitized carbon nitride precursor; and calcining the mixed precursor to obtain the hexagonal boron nitride modified graphitized carbon nitride composite optical catalyst. The hexagonal boron nitride modified graphitized carbon nitride composite optical catalyst disclosed by the invention has the advantages of being environmentally friendly, fully free of metal doping, large in specific surface area, high in photoproduction electron-hole separating efficiency, high in optical catalytic activity, good in stability, corrosion-resistant and the like. The preparation method has the advantages of being simple, low in cost of raw materials, less in energy consumption, easy to control conditions and the like. The composite optical catalyst disclosed by the invention is used for degrading dye wastewater and has the advantages of being simple in application method, stable in optical catalytic performance, high in corrosion resistance, high in dye wastewater degrading efficiency.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a hexagonal boron nitride modified graphitized carbon nitride composite photocatalyst and a preparation method and application thereof. Background technique [0002] With the increasingly serious energy crisis and environmental pollution problems, new energy technologies and new environmental purification technologies have attracted much attention. As a green technology, photocatalytic technology has made great progress in recent years. Photocatalytic reactions can not only split water to generate clean hydrogen energy, but also show great potential in photodegradation of environmental pollution. Photocatalytic purification technology has the advantages of small secondary pollution, low operating cost, and the use of solar energy to provide reaction driving force. It has broad application prospects in wastewater purification treatment and air purification. ...

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Problems solved by technology

However, the energy gap of pure phase graphitized carbon nitride is about 2.7 eV, which can only use sunlight below 460 nm, and the polymerization product is a dense block particle, which has low specific surface area, weak separation ability of photogenerated carriers, and photocatalytic Poor activity and other problems limit the wide application of this material

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