A kind of bismuth oxyhalide photocatalyst and preparation method thereof

Abstract

A bismuth oxyhalide photocatalyst uses sodium bismuthate as a bismuth source, and sodium halide or potassium bromate or cetyltrimethylammonium halide or halogenated cetylpyridinium or tetrabutylammonium halide as a halogen source. Place the halogen source in deionized water, stir for 20 minutes under ultrasonic conditions to dissolve it, then add sodium bismuthate to the halogen source to adjust the pH; Labeled as: Sodium halide (BiOBrNaBr), Potassium bromate (BiOBrKBrO3), Cetyltrimethylammonium halide (BiOBrCTAB), Cetylpyridinium halide (BiOBrCPB), Tetrabutylammonium halide (BiOBrTBB). The bismuth oxyhalide is applied to visible light sensitization or degradation of rhodamine B (RhB) and salicylic acid (SA). All have good stability and visible light catalytic activity, and meanwhile, the manufacturing process is simple and the cost is low.

Description

technical field [0001] The invention relates to a photocatalyst bismuth oxyhalide responsive to visible light and a preparation method thereof, which is applied to degrade toxic organic pollutants in the environment. Background technique [0002] Photocatalytic oxidation technology is a new type of chemical oxidation treatment method, which can successfully solve the defects of secondary pollution caused by other advanced oxidation methods to remove toxic organic compounds in water bodies. The light source removes most of the organic matter and other advantages. Since a very important element for the photocatalytic oxidation technology is the photocatalyst, the most studied photocatalyst is titanium dioxide, but due to its large band gap, low utilization rate of visible light, and high recombination rate of photogenerated electron-hole pairs, it is limited. further applications. Bismuth-based photocatalysts have good catalytic performance, especially obvious absorption in ...

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Problems solved by technology

[0004] There have been some reports on the application of this type of photocatalyst in the degradation of pollutants in water. Such documents include "Preparation of thin-layered BiOBr with CTAB as template and bromine source" published in "Journal of Hazardous Materials", 2009, 167:803-809 "Photocatalyst" (WenzhongWang.PreparationofBiOBrlamellarstructurewithhighphotocatalyticactivitybyCTABasBrsourceandtemplate.JournalofHazardousMaterials), "Catalytic Communications", 2010,11(5):460-464 published "by NaBiO 3 Preparation of BiOX photocatalysts for bismuth sources and their catalytic activity" (ChangX.BiOX(X=Cl,Br,I) photocatalystspreparedusingNaBiO 3 as theBisource:Characterization and catalytic performance.Catalysis Communications), "Solid State Chemistry", 2013,199:224–229, "BiOBr synthesis, characterization and its photocatalytic activity" (CaimeiFan.Synthesis,characterization,and photocatalytic properties of BiOBrcatalyst.Journal of Solid State Chemistry), "Materials Chemistry", "One-step synthesis of oxygen-rich bismuth oxybromide and its structural photocatalytic activity properties" published in 2012, 22, 22840 (JunminNan. Certain photocatalytic activity, but there are common problems of secondary pollution caused by the use of organic compounds or low photocatalytic efficiency of visible light

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