A kind of preparation method of go/sb-biobr composite photocatalyst

Abstract

The invention discloses a preparation method of GO / Sb-BiOBr composite photocatalyst, comprising the following steps: 1) preparing Sb-BiOBr photocatalyst; 2) preparing GO / Sb-BiOBr composite photocatalyst: weighing Sb-BiOBr photocatalyst and the GO prepared by the airtight oxidation method were put into deionized water respectively, ultrasonically oscillated respectively, and then the two were mixed and ultrasonically oscillated again, washed, filtered, and dried to obtain the GO / Sb‑BiOBr composite photocatalyst precursor, and then the precursor The body was put into a muffle furnace for the second heat preservation and calcined to obtain a GO / Sb-BiOBr composite photocatalyst; a combination of solvothermal method and ultrasonic precipitation method was used to realize the doping of Sb3+ and the recombination with GO. The GO / Sb-BiOBr composite photocatalyst prepared by doping Sb3+ and further loading GO in the present invention not only has a narrow band gap, but also the good electrical conductivity of GO can make photogenerated electrons move quickly and inhibit charge recombination; at the same time, GO The larger specific surface area can increase the adsorption capacity of the photocatalyst, which is more conducive to the degradation of dyes; it can be used for large-scale sewage treatment.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and in particular relates to a preparation method of a GO / Sb-BiOBr composite photocatalyst. Background technique [0002] In recent years, with the rapid development of the economy, the problems of environmental pollution and energy shortage have become increasingly prominent. Photocatalytic technology provides us with a way to effectively treat pollutants in water and utilize solar energy efficiently. The earliest photocatalyst discovered by humans is TiO 2 , but its bandgap energy is about 3.2eV, which leads to its absorption edge in the ultraviolet region. However, ultraviolet light only accounts for about 4% of the entire solar spectrum, so TiO 2 The utilization rate of solar energy is very low, and now it is becoming the focus of human research to find new high-efficiency photocatalysts that can respond to visible light. [0003] BiOX (X=Cl, Br, I) is a new type of PbFCl tetragona...

AI Technical Summary

Problems solved by technology

The earliest photocatalyst discovered by humans is TiO 2 , but its bandgap energy is about 3.2eV, which leads to its absorption edge in the ultraviolet region

However, ultraviolet light only accounts for about 4% of the entire solar spectrum, so TiO 2 The utilization rate of solar energy is very low, and now it is becoming the focus of human research to find new high-efficiency photocatalysts that can respond to visible light

[0003] BiOX (X=Cl, Br, I) is a new type of PbFCl tetragonal semiconductor material. The layered structure of bismuth oxyhalide crystals has enough space to polarize atoms and atomic orbitals, so that photogenerated electrons and space can be polarized. However, the photogenerated electrons excited by BiOCl, BiOBr, and BiOI indirect bandgap semiconductors must pass through some k-layers to reach the valence band position, which greatly reduces the electron and photocatalytic effect. recombination probability of holes

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