Perovskite nanocrystalline/flake graphite phase carbon nitride composite material and preparation method thereof

Abstract

The invention provides a perovskite nanocrystalline / flake graphite phase carbon nitride composite material and a preparation method thereof, and belongs to the field of composite photocatalyst materials. The flaky graphite-phase carbon nitride material is used as a carrier substance, and the two-dimensional plane structure of the flaky graphite-phase carbon nitride material is beneficial to transmission of electrons and effectively prevents compounding of electron-hole pairs in the material; and meanwhile, agglomeration of the perovskite nanocrystals is avoided, so that the perovskite nanocrystals can still have relatively high dispersity on the surfaces of the perovskite nanocrystals under a small particle size, and transfer of photo-generated electrons in a semiconductor perovskite photocatalyst is promoted, so that the separation efficiency of photo-generated charge carriers is improved, and the composite material shows good photocatalytic activity. The perovskite nanocrystal / flake graphite phase carbon nitride composite material provided by the invention has good photocatalytic activity, not only has a good photocatalytic degradation effect on organic dyes, but also has a relatively high hydrogen production rate when hydrogen is produced by photocatalytic decomposition of water.

Description

technical field [0001] The invention belongs to the field of composite photocatalyst materials, and in particular relates to a perovskite nanocrystal / flaky graphite phase carbon nitride composite material and a preparation method thereof. Background technique [0002] At present, the photocatalytic reaction using a single graphite phase carbon nitride or a single perovskite material is still at a low level. Therefore, although some researchers have combined graphite phase carbon nitride and perovskite nanocrystals to prepare Composite photocatalytic materials are documented, however, since typical ABO 3 Type perovskite nanocrystals are easy to agglomerate and not easy to disperse. In the prior art, composite catalysts are prepared by loading graphite-phase carbon nitride on the surface of perovskite nanocrystals. Performance analysis of materials and its application in light-Fenton treatment of wastewater" records that LaFeO in composite catalysts 3 At a theoretical mass o...

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Problems solved by technology

[0002] At present, the photocatalytic reaction using a single graphite phase carbon nitride or a single perovskite material is still at a low level. Therefore, although some researchers have combined graphite phase carbon nitride and perovskite nanocrystals to prepare Composite photocatalytic materials are documented, however, since typical ABO 3 Type perovskite nanocrystals are easy to agglomerate and not easy to disperse. In the prior art, composite catalysts are prepared by loading graphite-phase carbon nitride on the surface of perovskite nanocrystals. Performance analysis of materials and its application in light-Fenton treatment of wastewater" records that LaFeO in composite catalysts 3 At a theoretical mass of 90% (i.e. LaFeO 3 / g -C 3 N 4 -10%) The catalyst has the best activity, and the activity curve of the degradation rate of Rhodamine B tends to be gentle after reaching 95%, that is, the highest degradation rate can reach 95%

At the same time, some studies have shown that the XRD detection results show that there are many miscellaneous peaks in the perovskite / carbon nitride composite catalyst, and the characteristic peaks are not prominent enough. It is believed that the existence of N atoms in carbon nitride will affect the formation of the perovskite structure, thereby Limits the improvement of the photocatalytic performance of composite materials

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