CN109759122A - A kind of bismuth oxybromide ternary heterojunction structure photochemical catalyst and its preparation method and application - Google Patents
A kind of bismuth oxybromide ternary heterojunction structure photochemical catalyst and its preparation method and application Download PDFInfo
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- CN109759122A CN109759122A CN201910206821.3A CN201910206821A CN109759122A CN 109759122 A CN109759122 A CN 109759122A CN 201910206821 A CN201910206821 A CN 201910206821A CN 109759122 A CN109759122 A CN 109759122A
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- heterojunction structure
- bismuth oxybromide
- photochemical catalyst
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Abstract
The present invention discloses a kind of preparation method of bismuth oxybromide ternary heterojunction structure photochemical catalyst.Using five nitric hydrate bismuths, potassium bromide, graphite phase carbon nitride and silver nitrate as raw material, graphite phase carbon nitride obtained and the compound realization of silver bromide and bismuth oxybromide are modified, bismuth oxybromide ternary heterojunction structure photochemical catalyst is made by a step solvent-thermal method.The purer bismuth oxybromide of modified bismuth oxybromide prepared by the present invention has smaller forbidden bandwidth and higher visible light optical absorption.Smaller forbidden bandwidth reduces the transmission range of photo-generate electron-hole, the separative efficiency for improving photo-generate electron-hole, reduces recombination rate, and higher optical absorption improves photon utilization rate, electron hole creation rate is improved, photocatalytic activity under visible light is significantly improved.This method has the advantages that at low cost and facilitates operation.Using it can degradable organic pollutant under visible light, there is important practical value in the depollution of environment.
Description
Technical field
The invention belongs to catalysis material technical fields, and in particular to a kind of bismuth oxybromide ternary heterojunction structure photochemical catalyst
And its preparation method and application.
Background technique
Photocatalysis technology can be with effective solution energy and environmental problem, by increasingly extensive concern.Catalysis material
Sunlight hydrolytic hydrogen production can be utilized, can rely life with the waste of decomposing harmful substances and production and living generation, the solution mankind
The energy and environment problem deposited.Currently, the electron-hole pair recombination rate generated after the irradiation of photochemical catalyst light is big, photon is utilized
Low efficiency, photocatalytic activity be not high.Therefore research be modified to semiconductor light-catalyst be necessary, modified purpose and
Effect includes inhibiting electron hole pair compound to improve quantum efficiency, improves photochemical catalyst specific surface area.
Bismuth oxybromide photocatalyst (BiOBr) is a kind of nonmetallic P-type semiconductor, is made of Bi, O and Br element, due to
It is widely paid close attention to good chemical stability, thermal stability and optical characteristics by people, and forbidden bandwidth is
2.7eV can be absorbed the visible light that wavelength is less than 600nm, illustrate the great potential of non-metal optical catalyst degradation pollutant.
BiOBr is a kind of important ternary bismuth based semiconductor compound, is chlorine fluorine lead ore type, belongs to tetragonal crystal system.With unique electricity
Minor structure, excellent visible light absorption capacity, higher stability, preparation cost are lower and to the good drop of organic pollutant
Solution ability.Pure BiOBr photochemical catalyst is since weakly visible light absorption responds, high charge recombination, small specific surface area, photoproduction electricity
Son-hole is easily compound, limited so as to cause its photo-catalysis capability is made, thus needs to be modified it.
Summary of the invention
The object of the present invention is to provide a kind of preparation methods to be simple and convenient to operate, at low cost, mild condition, catalytic efficiency
The preparation method of high ternary heterojunction structure bismuth oxybromide photocatalyst.The technical solution adopted by the present invention is that: a kind of bromine oxidation
Bismuth ternary heterojunction structure photochemical catalyst, preparation method the following steps are included:
1) g-C3N4 powder is added in potassium bromide after stirring and dissolving to stir evenly in ethylene glycol, obtains solution A；
2) by five nitric hydrate bismuths, heating stirring dissolves in ethylene glycol, and it is super that silver nitrate is added after solution is cooled to room temperature
Sound dissolution, obtains solution B；
3) solution A is added dropwise in solution B and stirs 1-2h and be placed in high pressure water heating kettle, high pressure water heating kettle is placed in
Heating is reacted in baking oven, and high pressure water heating kettle is down to room temperature after reaction, and the drying in baking oven after centrifuge washing obtains mesh
Mark product.
A kind of above-mentioned bismuth oxybromide ternary heterojunction structure photochemical catalyst, in step 2), the heating temperature is 70-
100℃。
A kind of above-mentioned bismuth oxybromide ternary heterojunction structure photochemical catalyst, in molar ratio, potassium bromide: five nitric hydrate bismuths:
Silver nitrate: graphite phase carbon nitride=1:0.8:0.08:0.04.
A kind of above-mentioned bismuth oxybromide ternary heterojunction structure photochemical catalyst, in step 3), the heating temperature is 100-
120 DEG C, heating time 10-16h.
The application in degradable organic pollutant under visible light of bismuth oxybromide ternary heterojunction structure photochemical catalyst.
In the waste water of Yu Hanyou organic pollutant, above-mentioned bismuth oxybromide ternary heterojunction structure light is added in above-mentioned application
Catalyst, degrade 1-2h under visible light.
Above-mentioned application, the organic pollutant are Luo Ming pellet B.
The beneficial effects of the present invention are:
The present invention is prepared for BiOBr, g-C by step solvent-thermal method modification3N4The ternary heterojunction structure light compound with AgBr
Catalyst, the BiOBr of acquisition possess lower forbidden bandwidth and the response of higher visible absorption.Lower forbidden bandwidth reduces
The transmission range of photo-generate electron-hole, improves the separative efficiency of photo-generate electron-hole, reduces recombination rate, higher visible
Light absorption response improves photon utilization rate, improves electron hole creation rate, significantly improves light under visible light
Catalytic activity.Catalyst stability prepared by the method for the present invention is good, and chemical property is stablized, and may be reused.It can be seen that
The pure g-C of the speed ratio of rhodamine B degradation under light3N4It is 3.5 times high.
Detailed description of the invention
Fig. 1 is the XRD diagram of pure BiOBr catalyst prepared by embodiment 1.
Fig. 2 is the SEM figure of pure BiOBr catalyst prepared by embodiment 1.
Fig. 3 is the XRD diagram of ternary heterojunction structure BiOBr catalyst prepared by embodiment 2.
Fig. 4 is the SEM figure of ternary heterojunction structure BiOBr catalyst prepared by embodiment 2.
Fig. 5 is the ultraviolet-visible absorption spectroscopy comparison diagram of pure BiOBr catalyst and ternary heterojunction structure BiOBr catalyst.
Fig. 6 is the band gap comparison diagram of pure BiOBr catalyst and ternary heterojunction structure BiOBr catalyst.
Fig. 7 is the degradation rate pair of pure BiOBr and ternary heterojunction structure BiOBr catalyst in photocatalytic degradation rhodamine B
Than figure.
Specific embodiment
The pure BiOBr photochemical catalyst of embodiment 1
(1) preparation method
It measures five nitric hydrate bismuth heating stirring of 1.94g to be dissolved in 20 milliliters of ethylene glycol, be cooled to room temperature.It measures
0.595g potassium bromide stirring and dissolving is in 20 milliliters of ethylene glycol.Bismuth nitrate solution is added dropwise in ethylene glycol dissolved with potassium bromide
12h is kept in 120 DEG C of high pressure water heating kettles after middle stirring 1h.Deionized water and ethyl alcohol are used after high pressure water heating kettle is cooled to room temperature
Centrifuge washing is dry, obtains pure BiOBr photochemical catalyst.
(2) it detects
Fig. 1 is that the XRD of pure BiOBr photochemical catalyst sample is detected.As seen from Figure 1, not there are no other miscellaneous peaks, illustrate product
In be not present other impurities phase, what is obtained is single object phase.As can be seen from the figure sample has preferable crystallinity.Fig. 2
It is detected for the SEM of pure BiOBr photochemical catalyst sample.From Figure 2 it can be seen that pure BiOBr shows typical chondritic, individually
The diameter of ball is at 2-3 μm.
2 ternary heterojunction structure BiOBr photochemical catalyst of embodiment
1) stirring and dissolving, then addition 0.0184g g-C3N4 stirring in 20mL ethylene glycol by 0.595g potassium bromide
30min obtains solution A.
2) it is cooled to room temperature after dissolving by heating five nitric hydrate bismuth of 1.94g in 20mL ethylene glycol, is then added
0.068g silver nitrate stirring and dissolving, obtains solution B.
3) solution A is added dropwise in solution B and stirs 1-2h and be placed in high pressure water heating kettle, high pressure water heating kettle is placed in
12h is kept in 120 DEG C of baking ovens, uses deionized water and ethyl alcohol centrifuge washing after reaction, drying obtains ternary heterojunction structure
BiOBr。
(2) it detects
Fig. 3 is that the XRD of ternary heterojunction structure BiOBr catalyst sample is detected.Sample has good crystallization as seen from Figure 3
Degree, sample as shown in the figure respectively correspond and (200) and (220) of AgBr crystalline substance in 31.1 degree and 44.5 degree appearance, two diffraction maximums
Face.Since pure BiOBr is similar with the XRD characteristic peak of ternary heterojunction structure BiOBr, illustrate to be prepared with compound g-C3N4 and AgBr
Do not have to influence the formation of BiOBr microballoon during BiOBr.
Fig. 4 is that the SEM of ternary heterojunction structure BiOBr catalyst sample is detected.From fig. 4, it can be seen that the micro-sphere structure of sample by
A large amount of nano flakes are intensive to be packed together, these nano flake edges are irregular, and width is about 50-100nm.
Fig. 5 is the ultraviolet-visible absorption spectroscopy comparison diagram of pure BiOBr and ternary heterojunction structure BiOBr sample.It can by Fig. 5
See that ternary heterojunction structure BiOBr photochemical catalyst is apparently higher than pure BiOBr in the assimilation effect of 450-600nm visible light wave range and urges
Agent greatly improves the efficiency of light energy utilization.
Fig. 6 is pure BiOBr and the band gap spectrogram detection of ternary heterojunction structure BiOBr sample.Ternary is heterogeneous as seen from Figure 6
The band gap of structure BiOBr photochemical catalyst is significantly lower than pure BiOBr catalyst, and small forbidden bandwidth reduces photo-generate electron-hole
Transmission range, improve the separative efficiency of photo-generate electron-hole, reduce recombination rate.
The application of 3 ternary heterojunction structure BiOBr photochemical catalyst of embodiment
Ternary heterojunction structure BiOBr photochemical catalyst prepared by embodiment 1, embodiment 2 carries out photocatalyst material performance
Test.Method is as follows: pure BiOBr and each 0.01g of ternary heterojunction structure BiOBr being put in 100ml glass beaker respectively, respectively
The 2g/ml rhodamine b solution of 50ml is added, stirs 1h in darkroom.Using 300W xenon lamp as light source, photoelectric current is adjusted to 20mA
It sets, glass beaker is placed in immediately below xenon source, extract and open Xenon light shining after first time sample immediately, after 10min, extract
Second of sample will carry out visible absorption test, more each absorption peak face by sample each time every the sample of extraction in 10 minutes
Product.As a result as shown in fig. 7, after illumination 1h, rhodamine b is degraded 30% by pure BiOBr catalyst, and ternary heterojunction structure
Rhodamine b is degraded 95% or so by BiOBr, embodies ternary heterojunction structure BiOBr with higher catalytic capability.
Claims (7)
1. a kind of bismuth oxybromide ternary heterojunction structure photochemical catalyst, which is characterized in that preparation method the following steps are included:
1) g-C is added in potassium bromide in ethylene glycol after stirring and dissolving3N4Powder stirs evenly, and obtains solution A；
2) by five nitric hydrate bismuths, heating stirring dissolves in ethylene glycol, and it is molten that silver nitrate ultrasound is added after solution is cooled to room temperature
Solution, obtains solution B；
3) solution A is added dropwise in solution B and stirs 1-2h and be placed in high pressure water heating kettle, high pressure water heating kettle is placed in baking oven
Middle heating is reacted, and high pressure water heating kettle is down to room temperature after reaction, will be done in baking oven after product centrifuge washing in kettle
It is dry, obtain target product.
2. a kind of bismuth oxybromide ternary heterojunction structure photochemical catalyst according to claim 1, which is characterized in that step 2)
In, the heating temperature is 70-100 DEG C.
3. a kind of bismuth oxybromide ternary heterojunction structure photochemical catalyst according to claim 1, which is characterized in that by mole
Than potassium bromide: five nitric hydrate bismuths: silver nitrate: graphite phase carbon nitride=1:0.8:0.08:0.04.
4. a kind of bismuth oxybromide ternary heterojunction structure photochemical catalyst according to claim 1, which is characterized in that step 3)
In, the heating temperature is 100-120 DEG C, heating time 10-16h.
5. bismuth oxybromide ternary heterojunction structure photochemical catalyst described in claim 1 is under visible light in degradable organic pollutant
Using.
6. application according to claim 5, which is characterized in that in the waste water of Yu Hanyou organic pollutant, right is added and wants
Any bismuth oxybromide ternary heterojunction structure photochemical catalyst of 1-4 is sought, degrade 1-3h under visible light.
7. application according to claim 5, which is characterized in that the organic pollutant is Luo Ming pellet B.
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| CN111036243A (en) * | 2019-12-31 | 2020-04-21 | 福州大学 | Oxygen vacancy-containing transition metal-doped BiOBr nanosheet photocatalyst and preparation method and application thereof |
| CN112850649A (en) * | 2020-12-29 | 2021-05-28 | 杭州电子科技大学 | Preparation method of bismuth oxybromide nanosheet |
| CN114405531A (en) * | 2022-03-07 | 2022-04-29 | 广西民族大学 | Z-type heterojunction photocatalytic nano material with crystal face synergistic effect and preparation method and application thereof |
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| CN108080008A (en) * | 2017-12-05 | 2018-05-29 | 重庆大学 | A kind of preparation method of BiOBr/AgBr/GO Three-element composite photocatalysts |
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| CN111036243A (en) * | 2019-12-31 | 2020-04-21 | 福州大学 | Oxygen vacancy-containing transition metal-doped BiOBr nanosheet photocatalyst and preparation method and application thereof |
| CN111036243B (en) * | 2019-12-31 | 2021-08-31 | 福州大学 | Oxygen vacancy-containing transition metal-doped BiOBr nanosheet photocatalyst and preparation method and application thereof |
| CN112850649A (en) * | 2020-12-29 | 2021-05-28 | 杭州电子科技大学 | Preparation method of bismuth oxybromide nanosheet |
| CN112850649B (en) * | 2020-12-29 | 2022-03-25 | 杭州电子科技大学 | Preparation method of bismuth oxybromide nanosheet |
| CN114405531A (en) * | 2022-03-07 | 2022-04-29 | 广西民族大学 | Z-type heterojunction photocatalytic nano material with crystal face synergistic effect and preparation method and application thereof |
| CN114405531B (en) * | 2022-03-07 | 2022-12-13 | 广西民族大学 | Z-type heterojunction photocatalytic nano material with crystal face synergistic effect and preparation method and application thereof |
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