Photocatalyst and preparation method thereof

Abstract

The invention relates to a photocatalyst and a preparation method thereof, and belongs to the technical field of nano composite material photocatalysis. Bi2O2CO3 is used as a catalyst substrate, GO and PDA are doped onto Bi2O2CO3, and the GO is doped onto Bi2O2CO3, so that the electron capture capacity can be improved, an active center can be provided, and the photocatalytic performance can be improved; meanwhile, the PDA encapsulates and reduces the GO, so that the binding force of Bi2O2CO3 and rGO (redox graphene oxide) is increased, the charge transfer capability is improved, and the catalytic activity is improved. The preparation process of the photocatalyst is green and environment-friendly, the reaction conditions are mild, the used raw materials are cheap and easy to obtain, and thephotocatalyst has a wide application prospect in organic degradation.

Description

technical field [0001] The invention relates to a photocatalyst and a preparation method thereof, and belongs to the technical field of nanocomposite photocatalysis. Background technique [0002] With the rapid development of industry, energy shortage and environmental pollution are two important global problems today. Among them, dyes are representative organic pollutants widely used in industry. These pollutants cannot be effectively degraded when conventional degradation techniques are used, thus causing significant environmental risks. As an important renewable energy on the earth, light energy has played an important role in replacing non-renewable energy. Photocatalysts can produce strong oxidizing substances (such as hydroxyl radicals, oxygen, etc.) under light irradiation, and can be used to decompose organic compounds, some inorganic compounds, bacteria and viruses, etc., so as to achieve the purpose of purifying pollutants. One of the important applications of p...

AI Technical Summary

Problems solved by technology

However, due to the small specific surface area of ​​a single bismuth-based photocatalyst, there are not enough reactive sites, and its own structure is not conducive to the transfer and storage of electrons, and cannot effectively transfer photogenerated carriers, resulting in the easy recombination of photogenerated electrons and holes. thereby reducing the photocatalytic activity of the catalyst

Patent CN108017086A discloses a preparation method of bismuth oxycarbonate-graphene oxide nanocomposite, which is to mix solid-phase raw materials sodium bismuthate dihydrate, oxalic acid dihydrate and graphene oxide nanosheets, and then carry out ball milling solid-phase reaction, The resulting product is washed, centrifuged and dried to obtain the target product Bi 2 o 2 CO 3 -GO nanocomposites, but there are too many oxidized groups on GO, which may affect its compatibility with the material Bi 2 o 2 CO 3 The complete contact, thus affecting the photocatalytic effect

Patent CN105728008A in Bi 2 o 2 CO 3 Deposit AgC1 on the surface, and obtain AgC1 / Bi with visible light response and high catalytic activity by controlling the recombination amount of AgC1 2 o 2 CO 3 Composite photocatalytic material. The raw material of this method is silver nitrate. Silver is a precious metal, which has the disadvantages of high cost and difficult collection.