Preparation method of modified BiOBr visible light catalyst

A visible light and modified technology, applied in the field of photocatalysis, can solve the problems of weak light absorption capacity, difficult to recycle and reuse, low catalytic activity, etc., and achieve the effects of enhanced absorption capacity, good visible light catalytic activity, and simple preparation process.

Inactive Publication Date: 2016-08-10
陈建峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention: Aiming at the problems that the current BiOBr monomer photocatalyst has weak light absorption ability in the visible light region, the main absorption band is below 450nm, the catalytic activity is low, and it is difficult to recycle and reuse, a modified The preparation method of BiOBr visible light catalyst, the present invention uses bismuth oxide as bismuth source, bismuth nitrate is obtained by nitric acid treatment, and n-butylpyridine bromide ionic liquid is used as bromine source, bismuth nitrate and n-butylpyridine bromide ionic liquid are reacted to obtain The precursor is then reacted in a Teflon-lined stainless steel hydrothermal autoclave to obtain BiOBr, the zeolite is treated with cationic polyacrylamide, and the treated zeolite is reacted with BiOBr in a Teflon-lined stainless steel hydrothermal autoclave The modified BiOBr is obtained, and the zeolite itself can be used as a photocatalyst. The present invention modifies the BiOBr by adding zeolite, so that the absorption band of the visible light catalyst is located above 570nm, so that the absorption capacity is enhanced, and the modified BiOBr is easy to recycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] First weigh 10g of bismuth oxide and add it to a beaker containing 100mL of ethanol, then use 180W ultrasonic wave to disperse for 10min to obtain a uniformly dispersed yellow dispersion, pour the dispersion into a 500mL two-necked flask equipped with a thermometer, and place the flask on the In an ice-water bath, add 30mL of 65% concentrated nitric acid to the flask at a rate of 5mL / min while stirring, and react for 1h to obtain a dispersion containing bismuth nitrate, which is set aside; weigh 20mL of pyridine and 10mL of n-bromobutane into the container In a 250mL three-necked flask with a thermometer and a reflux device, the temperature is controlled by a water bath at 60°C, and the reaction is stirred for 2 hours to obtain a reddish-brown liquid, that is, n-butylpyridine bromide ionic liquid; add the above-mentioned n-butylpyridine bromide ionic liquid into a 500mL beaker Then add all the spare bismuth nitrate dispersion to the beaker, place the flask in a vacuum dr...

example 2

[0021]First weigh 15g of bismuth oxide and add it to a beaker containing 150mL of ethanol, then use 190W ultrasonic wave to disperse for 15min to obtain a uniformly dispersed yellow dispersion, pour the dispersion into a 500mL two-necked flask equipped with a thermometer, and place the flask on the In an ice-water bath, add 35mL of 65% concentrated nitric acid to the flask at a rate of 5mL / min while stirring, and react for 1.5h to obtain a dispersion containing bismuth nitrate, which is set aside; weigh 25mL of pyridine and 15mL of n-bromobutane into In a 250mL three-necked flask equipped with a thermometer and a reflux device, the water bath controls the temperature at 70°C, and stirs for 2.5 hours to obtain a reddish-brown liquid, namely brominated n-butylpyridine ionic liquid; add the above-mentioned n-butylbrominated pyridinium ionic liquid In a 500mL flask, add all spare bismuth nitrate dispersions to the flask, and react at 55°C for 25min to obtain a precursor, which is p...

example 3

[0024] First weigh 20g of bismuth oxide and add it to a beaker containing 200mL of ethanol, then use 200W ultrasonic wave to disperse for 20min to obtain a uniformly dispersed yellow dispersion liquid, pour the dispersion liquid into a 500mL two-necked flask equipped with a thermometer, and place the flask on the In an ice-water bath, add 40mL of 65% concentrated nitric acid to the flask at a rate of 5mL / min while stirring, and react for 2 hours to obtain a dispersion containing bismuth nitrate, which is set aside; weigh 30mL of pyridine and 20mL of n-bromobutane into the container In a 250mL three-necked flask with a thermometer and a reflux device, the water bath controls the temperature at 80°C, and stirs for 3 hours to obtain a reddish-brown liquid, that is, n-butylpyridine bromide ionic liquid; add the above-mentioned n-butylpyridine bromide ionic liquid into a 500mL flask Then add all spare bismuth nitrate dispersions to the flask, place the flask in a vacuum drying oven,...

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Abstract

The invention discloses a preparation method of a modified BiOBr visible light catalytic film, which belongs to the technical field of photocatalysis. In the present invention, bismuth oxide is used as bismuth source, bismuth nitrate is obtained by nitric acid treatment, n-butylpyridinium bromide ionic liquid is used as bromine source, bismuth nitrate is reacted with n-butylpyridine bromide ionic liquid to obtain a precursor, and then in Teflon BiOBr is obtained by reaction in a stainless steel hydrothermal autoclave lined with dragon, and the zeolite is treated with cationic polyacrylamide, and the treated zeolite and BiOBr are reacted in a stainless steel hydrothermal autoclave lined with Teflon to obtain modified BiOBr, the zeolite itself It can be used as a photocatalyst, and the present invention modifies the BiOBr by adding zeolite, so that the absorption band of the visible light catalyst is above 570nm, so that the absorption capacity is enhanced, and the modified BiOBr is easy to recycle.

Description

technical field [0001] The invention discloses a preparation method of a modified BiOBr visible light catalytic film, which belongs to the technical field of photocatalysis. 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 the visible light range, which is their rem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/076
CPCB01J29/076B01J35/004B01J2229/18
Inventor 陈建峰孟浩影
Owner 陈建峰
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