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Preparation method and application of BiOBr/COF composite photocatalyst

A catalyst, composite light technology, applied in catalyst activation/preparation, organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, etc.

Pending Publication Date: 2020-10-27
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, how to use covalent organic framework (COF) to support BiOBr to prepare a photocatalyst with superior performance has not been reported in the relevant literature.

Method used

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  • Preparation method and application of BiOBr/COF composite photocatalyst
  • Preparation method and application of BiOBr/COF composite photocatalyst
  • Preparation method and application of BiOBr/COF composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation method of BiOBr / COF composite photocatalyst, the steps are as follows:

[0031] ① Preparation of COF

[0032] Weigh 0.5g terephthalic acid, add 20mL dioxane and 20mL mesitylene, stir well for 2h.

[0033] The mixed solution was placed in a 50mL autoclave, raised from room temperature to 120°C at a rate of 5°C / min, and kept for 24h.

[0034] Cool naturally to room temperature. After washing with acetone for several times, and drying in vacuum at 50°C for 4 hours, a white COF powder was obtained.

[0035] ② Preparation of BiOBr / COF composite photocatalyst

[0036] Weigh 0.238g of KBr and dissolve it in 40mL of ethylene glycol methyl ether to obtain liquid A.

[0037] Weigh 0.4g of COF and 0.970g of Bi(NO 3 ) 3 ·5H 2 O, add 40mL of ethylene glycol methyl ether, and sonicate for 30min to obtain liquid B.

[0038] Under constant stirring, add liquid A dropwise to liquid B, sonicate for 30 min, and stir for 2 h.

[0039] The mixed solution was transfe...

Embodiment 2

[0046] Photocatalytic degradation of RhB experiment

[0047] Take 20 mg of photocatalyst, add it into newly prepared 100 mL RhB (5 mg / L) solution, put it into a photochemical reaction apparatus, and stir at room temperature in the dark for 30 min to achieve adsorption equilibrium. Turn on the light source, irradiate the solution with a 700W xenon lamp, take samples every 10 minutes to measure the absorbance, use the standard curve to obtain the concentration C of the RhB solution, and set the initial concentration of RhB as C 0 , according to the formula: (1-C / C 0 )*100%, calculate the degradation rate of RhB.

[0048] In order to investigate the effects of different COF / BiOBr mass ratios, solvothermal temperature and solvothermal time on the photocatalytic activity, different conditions were changed to obtain various degradation rate curves.

[0049] Figure 6 It is the comparison curve of the degradation rate of RhB for different COF / BiOBr mass ratios, by Figure 6 It ca...

Embodiment 3

[0054] Degradation performance of BiOBr / COF composite photocatalysts for different dyes

[0055] The experimental process is the same as in Example 2, and a total of 5 dyes are selected to be prepared in Example 1, including Rhodamine B (RhB), Acid Fuchsin (AF), Methyl Orange (MO), Methyl Blue (MB), and Brilliant Green (BG). The photocatalytic effect of the composite photocatalyst was evaluated.

[0056] Figure 9 For the effect of BiOBr / COF composite photocatalyst on the photocatalytic activity of different dyes, by Figure 9 It can be seen that the degradation rates of RhB, AF, MO, MB, and BG by BiOBr / COF photocatalyst are all above 90%, respectively 98.69%, 99.26%, 98.03%, 97.5%, and 91.33%. Photocatalysts have strong photocatalytic degradation effects on common organic dyes.

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Abstract

The invention discloses a preparation method and application of a BiOBr / COF composite photocatalyst, and belongs to the technical field of preparation and application of composite photocatalysts. Thepreparation method comprises the following steps: firstly, synthesizing COF by taking p-phenyldiboronic acid as a raw material and dioxane and mesitylene as solvents and adopting a solvothermal method; then, using bismuth nitrate pentahydrate and potassium bromide as raw materials, using ethylene glycol monomethyl ether as a solvent, adopting an in-situ solvothermal method, depositing nano BiOBr particles on a COF matrix, and preparing the BiOBr / COF composite photocatalyst material. According to the preparation method, COF is selected as a carrier of BiOBr so that the dispersity of BiOBr particles can be improved, the specific surface area can be increased, the active center of a photocatalytic reaction can be increased, and finally, the photocatalytic performance can be improved. The composite photocatalyst prepared by the method shows good stability, has a strong photocatalytic degradation effect on a variety of common organic dyes, and still has a degradation rate of 80% or above after being repeatedly used for 4 times.

Description

technical field [0001] The invention belongs to the technical field of composite photocatalyst preparation and application, and in particular relates to a preparation method and application of a BiOBr / COF composite photocatalyst. Background technique [0002] Organic dye wastewater has the characteristics of high chroma, high COD, and high chemical stability, which are difficult to treat by traditional microbial degradation processes. The photocatalytic degradation method has the advantages of simple operation, high efficiency, energy saving (solar energy can be used), complete degradation (the product is mainly CO 2 and H 2 O) and other advantages, it is a promising organic wastewater treatment technology developed in recent years, which has received widespread attention. [0003] BiOBr is a tetragonal, visible light-responsive semiconductor photocatalyst. Under light irradiation, BiOBr generates electron-hole pairs, which interact with O 2 and H 2 O reacts to form str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26B01J31/06B01J35/10B01J37/08C02F1/30C02F1/72C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01J31/26B01J31/063B01J37/08C02F1/30C02F1/725C02F2101/308C02F2101/34C02F2101/36C02F2101/38C02F2305/10B01J35/39B01J35/61
Inventor 杨本宏胡俊俊丁同悦陈奕桦
Owner HEFEI UNIV
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