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Bismuth oxybromide ternary heterostructure photocatalyst as well as preparation method and application thereof

A heterogeneous structure, bismuth oxybromide technology, applied in the field of photocatalytic materials, can solve the problems of easy recombination of photogenerated electrons and holes, weak visible light absorption response, and limited photocatalytic ability, so as to achieve stable chemical properties and improve photon utilization rate, improve the effect of photocatalytic activity

Active Publication Date: 2019-05-17
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the weak visible light absorption response, high charge recombination, small specific surface area, and easy recombination of photogenerated electrons and holes, the pure BiOBr photocatalyst has limited photocatalytic ability, so it needs to be modified.

Method used

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  • Bismuth oxybromide ternary heterostructure photocatalyst as well as preparation method and application thereof
  • Bismuth oxybromide ternary heterostructure photocatalyst as well as preparation method and application thereof
  • Bismuth oxybromide ternary heterostructure photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 pure BiOBr photocatalyst

[0024] (1) Preparation method

[0025] Measure 1.94 g of bismuth nitrate pentahydrate, dissolve it in 20 ml of ethylene glycol with heating and stirring, and cool to room temperature. Measure 0.595 g of potassium bromide and dissolve it in 20 ml of ethylene glycol with stirring. Ethylene glycol dissolved with potassium bromide was added dropwise into the bismuth nitrate solution, stirred for 1 hour, and then kept in a high-pressure hydrothermal kettle at 120°C for 12 hours. After the high-pressure hydrothermal kettle was cooled to room temperature, it was washed and dried by centrifugation with deionized water and ethanol to obtain a pure BiOBr photocatalyst.

[0026] (2) Detection

[0027] figure 1 XRD detection for pure BiOBr photocatalyst samples. Depend on figure 1 It can be seen that there are no other impurity peaks, indicating that there are no other impurity phases in the product, and what is obtained is a single pha...

Embodiment 2 3

[0028] Example 2 Ternary heterostructure BiOBr photocatalyst

[0029] 1) Stir and dissolve 0.595g potassium bromide in 20mL ethylene glycol, then add 0.0184g g-C3N4 and stir for 30min to obtain solution A.

[0030] 2) Heat and dissolve 1.94g of bismuth nitrate pentahydrate in 20mL of ethylene glycol and cool to room temperature, then add 0.068g of silver nitrate and stir to dissolve to obtain solution B.

[0031] 3) Add solution A dropwise to solution B and stir for 1-2 hours, then place in a high-pressure hydrothermal kettle, place the high-pressure hydrothermal kettle in an oven at 120°C for 12 hours, and wash with deionized water and ethanol centrifugally after the reaction , and dried to obtain a ternary heterostructure BiOBr.

[0032] (2) Detection

[0033] image 3 It is the XRD detection of the ternary heterostructure BiOBr catalyst sample. Depend on image 3 It can be seen that the sample has good crystallinity. As shown in the figure, the sample has two diffracti...

Embodiment 3 3

[0037] Application of embodiment 3 ternary heterostructure BiOBr photocatalyst

[0038] The ternary heterostructure BiOBr photocatalysts prepared in Examples 1 and 2 were tested for photocatalyst material properties. The method is as follows: put 0.01 g of pure BiOBr and ternary heterostructure BiOBr into 100 ml glass beakers, add 50 ml of 2 g / ml rhodamine b solution, and stir in a dark room for 1 h. Use a 300W xenon lamp as the light source, adjust the photocurrent to 20mA, place the glass beaker directly under the xenon lamp light source, turn on the xenon lamp immediately after taking the first sample, and take the second sample after 10 minutes, and take a sample every 10 minutes , each sample was subjected to a visible light absorption test, and the areas of the absorption peaks were compared. The result is as Figure 7 As shown, after 1 h of light irradiation, the pure BiOBr catalyst degrades rhodamine b by 30%, while the ternary heterostructure BiOBr degrades rhodamin...

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Abstract

The invention discloses a preparation method of a bismuth oxybromide ternary heterostructure photocatalyst. The method uses bismuth nitrate pentahydrate, potassium bromide, graphite phase carbon nitride and silver nitrate as raw materials; the prepared graphite phase carbon nitride and silver bromide are compounded with bismuth oxybromide so as to realize modification; the bismuth oxybromide ternary heterostructure photocatalyst is prepared by using a one-step solvothermal method. The modified bismuth oxybromide prepared by the method is purer, has a smaller forbidden band width and a higher visible light absorbing effect. The smaller forbidden band width reduces the transmission distance of photogenerated electron holes, improves the separation efficiency of the photogenerated electron holes, and reduces the recombination rate; the higher light absorption effect improves photon utilization rate, increases the yield of the electron hole pairs, and greatly improves the photocatalytic activity under the visible light. The method has the advantages of being low in cost and convenient to operate; the bismuth oxybromide ternary heterostructure photocatalyst can be used for degrading organic pollutants under the visible light, thus having an important practical value in environmental purification.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a bismuth oxybromide ternary heterostructure photocatalyst and a preparation method and application thereof. Background technique [0002] Photocatalytic technology can effectively solve energy and environmental problems, and has received increasing attention. Photocatalytic materials can use sunlight to hydrolyze hydrogen, and can also decompose harmful substances and waste generated by production and life, so as to solve the energy and environmental problems that human beings depend on for survival. At present, photocatalysts produced by light irradiation have a high recombination rate of electron-hole pairs, low photon utilization efficiency, and low photocatalytic activity. Therefore, it is necessary to study the modification of semiconductor photocatalysts. The purpose and function of modification include inhibiting the recombination of electron...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/34C02F101/38
Inventor 王绩伟云久梅勇刘雯范晓星谭天亚
Owner LIAONING UNIVERSITY
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