CN114433145A - Bi24O31Br10/MgAl-LDH composite photocatalyst and preparation method and application thereof - Google Patents
Bi24O31Br10/MgAl-LDH composite photocatalyst and preparation method and application thereof Download PDFInfo
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- 239000011941 photocatalyst Substances 0.000 title claims abstract description 55
- 239000002131 composite material Substances 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 230000001699 photocatalysis Effects 0.000 claims abstract description 18
- 238000011065 in-situ storage Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 239000008367 deionised water Substances 0.000 claims description 26
- 229910021641 deionized water Inorganic materials 0.000 claims description 26
- 239000000243 solution Substances 0.000 claims description 24
- 238000006243 chemical reaction Methods 0.000 claims description 19
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 17
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 11
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 8
- 239000004202 carbamide Substances 0.000 claims description 8
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 4
- JLDSOYXADOWAKB-UHFFFAOYSA-N aluminium nitrate Chemical compound [Al+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O JLDSOYXADOWAKB-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 229910052724 xenon Inorganic materials 0.000 claims description 4
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 230000009467 reduction Effects 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 6
- 239000005447 environmental material Substances 0.000 abstract description 2
- 238000004729 solvothermal method Methods 0.000 abstract 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 17
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 12
- 238000004090 dissolution Methods 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000969 carrier Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 229910000416 bismuth oxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007146 photocatalysis Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 241001464837 Viridiplantae Species 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000013032 photocatalytic reaction Methods 0.000 description 1
- 230000029553 photosynthesis Effects 0.000 description 1
- 238000010672 photosynthesis Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
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- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
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Abstract
The invention provides a Bi24O31Br10a/MgAl-LDH composite photocatalyst and a preparation method and application thereof, belonging to the technical field of photocatalyst and environmental material preparation; in the invention, the two-dimensional MgAl-LDH is prepared by a solvothermal method, and then Bi is grown on the surface of the MgAl-LDH by utilizing an in-situ growth technology24O31Br10Preparing Bi24O31Br10a/MgAl-LDH composite photocatalyst; the Bi24O31Br10the/MgAl-LDH composite photocatalyst is of a two-dimensional/two-dimensional structure and can be used for photocatalytic reduction of CO2。
Description
Technical Field
The invention belongs to the technical field of photocatalyst and environmental material preparation, and particularly relates to Bi24O31Br10a/MgAl-LDH composite photocatalyst and a preparation method and application thereof.
Background
At present, fossil energy is still the main energy structure, but the continuous consumption of fossil energy can accelerate the expansion trend of energy crisis, and CO caused by fossil energy2Emissions can lead to greenhouse effects. Thus, a green, safe, viable CO was sought2The energy conversion technology has important strategic significance in catalytically converting the energy into hydrocarbon energy with high added value so as to relieve the greenhouse effect and the energy pressure.
At present, CO is mixed2There are various ways of performing energy conversion, in which CO is reduced by solar-driven photocatalysis2Technology, simulating photosynthesis of green plant by photocatalytic reaction, and reacting CO2Conversion into hydrocarbon fuel to realize CO2The process has the advantages of mild reaction conditions, environmental friendliness, no secondary pollution and the like, is an ideal emission reduction and energy conversion technology, and provides an effective solution for the increasingly serious problems of energy shortage, greenhouse effect and the like.
Bi24O31Br10As selective layered catalysts (lamellae are positively charged [ Bi ]xOy]Cationic layer and negatively charged [ Br ]z]Anionic layer) is one of the most important inorganic graphene-like photocatalysts at present. Due to the difference between the covalent bond action of bismuth and oxygen in the bismuth oxide layer and the Van der Waals force between X atomic layers, charge distribution between the bismuth oxide layer and the X atomic layers is uneven, so that an interlayer internal electric field is induced, separation and transmission of charges can be effectively promoted, and the photocatalytic activity is enhanced. However, Bi24O31Br10The method also has the common problem of the semiconductor photocatalyst, namely the photo-generated carriers are easy to compound after being separated and the photo-generated carriers transferred to the surface can not effectively participate in catalytic reaction, thereby seriously inhibiting the photocatalytic activity of the photo-generated carriers.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides Bi24O31Br10a/MgAl-LDH composite photocatalyst and a preparation method and application thereof. In the present invention, first, the reaction is carried out by a solvothermal methodPreparing two-dimensional MgAl-LDH, and growing Bi on the surface of the MgAl-LDH by using an in-situ growth technology24O31Br10Preparing Bi24O31Br10a/MgAl-LDH composite photocatalyst; the Bi24O31Br10the/MgAl-LDH composite photocatalyst can be used for photocatalytic reduction of CO2。
The invention firstly provides Bi24O31Br10the/MgAl-LDH composite photocatalyst is Bi24O31Br10the/MgAl-LDH composite photocatalyst is of a two-dimensional/two-dimensional structure, and the composite photocatalyst is formed by growing Bi of a two-dimensional rectangular sheet structure in an in-situ growth mode24O31Br10Growing on the surface of MgAl-LDH with a two-dimensional hexagonal sheet structure.
The invention also provides the Bi24O31Br10The preparation method of the/MgAl-LDH composite photocatalyst specifically comprises the following steps:
(1) preparation of MgAl-LDH:
mixing Mg (NO)3)2·6H2O and Al (NO)3)3·9H2Dissolving O in deionized water, stirring until the O is completely dissolved, then adding a urea aqueous solution, stirring and mixing uniformly, carrying out hydrothermal reaction, cooling after the reaction is finished, centrifuging, washing, and drying to obtain MgAl-LDH;
(2)Bi24O31Br10preparing a/MgAl-LDH composite photocatalyst:
MgAl-LDH and Bi (NO)3)2·5H2Dissolving O in ethanol, stirring until the O is completely dissolved, adding a KBr water solution, stirring until the mixture is uniformly mixed, adding ethanolamine, stirring until the mixture is uniformly mixed, carrying out hydrothermal reaction, cooling after the reaction is finished, centrifuging, washing and drying to obtain Bi24O31Br10the/MgAl-LDH composite photocatalyst.
Further, in the step (1), Mg (NO)3)2·6H2O、Al(NO3)3·9H2The mass ratio of O to urea is 1-3: 1: 4.
further, in the step (1), the hydrothermal reaction conditions are as follows: reacting for 12-24 h at 120 ℃.
Further, in the step (2), the MgAl-LDH and Bi (NO) are added3)2·5H2The mass ratio of O is 1: 0.8-3.2.
Further, in the step (2), Bi (NO)3)2·5H2The mass ratio of O to KBr is 6-10: 2.25.
further, in the step (2), Bi (NO)3)2·5H2The dosage ratio of O to ethanolamine is 6-10 mmol: 1.2 mL.
Further, in the step (2), the hydrothermal reaction conditions are as follows: the reaction was carried out at 160 ℃ for 12 h.
The invention also provides the Bi24O31Br10/MgAl-LDH composite photocatalyst for photocatalytic conversion of CO2The use of (1).
Further, the application is as follows:
irradiating with xenon lamp, adding deionized water, triethanolamine and Bi24O31Br10Adding the/MgAl-LDH composite photocatalyst into a photoreactor, and reacting in the presence of CO2Reacting under a gas atmosphere.
Further, deionized water, triethanolamine and Bi24O31Br10The dosage of the/MgAl-LDH composite photocatalyst is 90mL, 10mL and 0.03 g.
Compared with the prior art, the invention has the beneficial effects that:
the invention utilizes MgAl-LDH with a sheet structure to improve the photocatalysis to CO2Trapping ability of (2) and Bi24O31Br10Dispersibility, help to promote the photocatalytic activity. The invention constructs 2D/2D Bi24O31Br10the/MgAl-LDH contact interface promotes the transfer efficiency of photon-generated carriers between interfaces.
The invention realizes the use of 2D/2D Bi24O31Br10/MgAl-LDH as composite photocatalyst for photocatalytic reduction of CO2The purpose of (1). Under the irradiation of simulated sunlight, the carbon dioxide passes through the carbon dioxide and CO2The interface interaction of the molecules realizes special catalytic or conversion effect, thereby achieving the photocatalytic reduction of CO2The process can be used to convert CO2The carbon resource is recycled by being converted into the hydrocarbon fuel, and the operation is simple and convenient, so that the method is an environment-friendly energy conversion technology.
Drawings
FIG. 1 shows Bi24O31Br10An XRD spectrogram of the/MgAl-LDH composite photocatalyst.
FIG. 2 shows Bi24O31Br10SEM image of/MgAl-LDH composite photocatalyst.
FIG. 3 shows the photocatalytic conversion of CO2Experimental CO and CH4The yield chart.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
In the following examples, photocatalytic activity was evaluated using the following procedure: in a photoreactor, xenon lamp irradiation, 90mL of deionized water and 10mL of triethanolamine were added to the reactor followed by 0.03g of Bi24O31Br10the/MgAl-LDH composite photocatalytic material is continuously filled with CO2Gas is magnetically stirred, and the reactor is filled with CO2And after the gas is generated, closing the gas outlet to enable the interior of the reactor to reach a certain pressure, sealing the reactor, opening a xenon lamp light source, and sampling and analyzing at intervals of 1 h.
Example 1:
(1) preparation of MgAl-LDH:
adding 8mmol of Mg (NO)3)2·6H2O and 4mmol of Al (NO)3)3·9H2O was dissolved in 35mL of deionized water and stirring was continued until completely dissolved. An additional 16mmol of urea was dissolved in 35mL of deionized water and stirring was continued until complete dissolution. The two solutions were mixed dropwise with constant stirring for 30 min. And heating the solution at the temperature of 120 ℃ for 24 hours, cooling to room temperature, centrifuging, and washing with deionized water and ethanol for 3 times respectively to obtain the MgAl-LDH material.
(2)Bi24O31Br10Preparing a/MgAl-LDH composite photocatalyst:
0.5g of MgAl-LDH and 1.2g of Bi (NO) were weighed out3)2·5H2O was dissolved in 50mL of ethylene glycol and stirring was continued until complete dissolution. An additional 0.345g of KBr was dissolved in 20mL of deionized water and stirring was continued until complete dissolution. The two solutions were mixed dropwise, and 1.2mL of ethanolamine was added to the above solution and stirred for 30 min. Heating the solution at 160 ℃ under a hydrothermal condition for 12h, cooling to room temperature, centrifuging, washing with deionized water and ethanol for 3 times respectively to obtain Bi24O31Br10the/MgAl-LDH composite photocatalyst.
Taking prepared Bi24O31Br10the/MgAl-LDH composite photocatalyst is used for carrying out photocatalytic reduction on CO in a photochemical reactor2Testing, and measuring CO and CH within 5h4Respectively, in a yield of 118.1. mu. mol g-1And 64.2. mu. mol g-1。
FIG. 1 shows Bi24O31Br10An XRD spectrogram of the/MgAl-LDH composite photocatalyst; clearly showing Bi24O31Br10XRD pattern of/MgAl-LDH containing Bi24O31Br10And the characteristic peaks of MgAl-LDH, which indicates that Bi24O31Br10Successfully synthesizing the/MgAl-LDH composite photocatalyst.
FIG. 2 shows Bi24O31Br10SEM picture of/MgAl-LDH composite photocatalyst; it can be seen from the figure that Bi24O31Br10the/MgAl-LDH is of a two-dimensional/two-dimensional structure.
Example 2:
(1) preparation of MgAl-LDH:
adding 8mmol of Mg (NO)3)2·6H2O and 4mmol of Al (NO)3)3·9H2O was dissolved in 35mL of deionized water and stirring was continued until completely dissolved. An additional 16mmol of urea was dissolved in 35mL of deionized water and stirring was continued until complete dissolution. The two solutions were mixed dropwise with constant stirring for 30 min. Heating the solution at 120 deg.C under hydrothermal condition for 24 hr, cooling to room temperature, centrifuging, and respectively adding deionized water and ethanolWashing for 3 times to obtain the MgAl-LDH material.
(2)Bi24O31Br10Preparing a/MgAl-LDH composite photocatalyst:
0.5g of MgAl-LDH and 0.4g of Bi (NO) were weighed out3)2·5H2O was dissolved in 50mL of ethylene glycol and stirring was continued until complete dissolution. An additional 0.115g of KBr was dissolved in 20mL of deionized water and stirring was continued until complete dissolution. The two solutions were mixed dropwise, and 1.2mL of ethanolamine was added to the above solution and stirred for 30 min. Heating the solution at 160 ℃ under a hydrothermal condition for 12h, cooling to room temperature, centrifuging, washing with deionized water and ethanol for 3 times respectively to obtain Bi24O31Br10the/MgAl-LDH composite photocatalyst.
Taking prepared Bi24O31Br10the/MgAl-LDH composite photocatalyst is used for carrying out photocatalytic reduction on CO in a photochemical reactor2Testing, and measuring CO and CH within 5h4Respectively, in a yield of 96.4. mu. mol g-1And 48.9. mu. mol g-1。
Example 3:
(1) preparation of MgAl-LDH:
adding 8mmol of Mg (NO)3)2·6H2O and 4mmol of Al (NO)3)3·9H2O was dissolved in 35mL of deionized water and stirring was continued until completely dissolved. An additional 16mmol of urea was dissolved in 35mL of deionized water and stirring was continued until complete dissolution. The two solutions were mixed dropwise with constant stirring for 30 min. And heating the solution at the temperature of 120 ℃ for 24 hours, cooling to room temperature, centrifuging, and washing with deionized water and ethanol for 3 times respectively to obtain the MgAl-LDH material.
(2)Bi24O31Br10Preparing a/MgAl-LDH composite photocatalyst:
0.5g of MgAl-LDH and 1.6g of Bi (NO) were weighed out3)2·5H2O was dissolved in 50mL of ethylene glycol and stirring was continued until complete dissolution. An additional 0.46g of KBr was dissolved in 20mL of deionized water and stirring was continued until complete dissolution. The two solutions were mixed dropwise, and 1.2mL of ethanolamine was added to the above solution and stirred for 30 min. Subjecting the solution to hydrothermal strip at 160 deg.CHeating for 12h, cooling to room temperature, centrifuging, washing with deionized water and ethanol for 3 times respectively to obtain Bi24O31Br10the/MgAl-LDH composite photocatalyst.
Taking prepared Bi24O31Br10the/MgAl-LDH composite photocatalyst is used for carrying out photocatalytic reduction on CO in a photochemical reactor2Testing, and measuring CO and CH within 5h4Respectively, in a yield of 104.6. mu. mol g-1And 55.4. mu. mol g-1。
Example 4:
(1) preparation of MgAl-LDH:
adding 8mmol of Mg (NO)3)2·6H2O and 4mmol of Al (NO)3)3·9H2O was dissolved in 35mL of deionized water and stirring was continued until completely dissolved. An additional 16mmol of urea was dissolved in 35mL of deionized water and stirring was continued until complete dissolution. The two solutions were mixed dropwise with constant stirring for 30 min. And heating the solution at the temperature of 120 ℃ for 24 hours, cooling to room temperature, centrifuging, and washing with deionized water and ethanol for 3 times respectively to obtain the MgAl-LDH material.
(2)Bi24O31Br10Preparing a/MgAl-LDH composite photocatalyst:
0.5g of MgAl-LDH and 0.8g of Bi (NO) were weighed out3)2·5H2O was dissolved in 50mL of ethylene glycol and stirring was continued until complete dissolution. An additional 0.23g of KBr was dissolved in 20mL of deionized water and stirring was continued until complete dissolution. The two solutions were mixed dropwise, and 1.2mL of ethanolamine was added to the above solution and stirred for 30 min. Heating the solution at 160 ℃ under a hydrothermal condition for 12h, cooling to room temperature, centrifuging, washing with deionized water and ethanol for 3 times respectively to obtain Bi24O31Br10the/MgAl-LDH composite photocatalyst.
Taking prepared Bi24O31Br10the/MgAl-LDH composite photocatalyst is used for carrying out photocatalytic reduction on CO in a photochemical reactor2Testing, and measuring CO and CH within 5h4Respectively, yield of (2) was 75.2. mu. mol g-1And 33.7. mu. mol g-1。
FIG. 3 is a drawing showingBi prepared in examples 1 to 424O31Br10/MgAl-LDH composite photocatalyst, Bi24O31Br10And MgAl-LDH conversion of CO2Experimental CO and CH4Yield plot, as can be seen from the plot, in comparison to Bi24O31Br10And MgAl-LDH, Bi produced in the present invention24O31Br10the/MgAl-LDH has better photocatalytic conversion of CO2And (4) activity.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (10)
1. Bi24O31Br10the/MgAl-LDH composite photocatalyst is characterized in that the Bi24O31Br10the/MgAl-LDH composite photocatalyst is of a two-dimensional/two-dimensional structure, and the composite photocatalyst is formed by growing Bi of a two-dimensional rectangular sheet structure in an in-situ growth mode24O31Br10Growing on the surface of MgAl-LDH with a two-dimensional hexagonal sheet structure.
2. The Bi of claim 124O31Br10The preparation method of the/MgAl-LDH composite photocatalyst is characterized by comprising the following steps:
(1) preparation of MgAl-LDH:
mixing Mg (NO)3)2·6H2O and Al (NO)3)3·9H2Dissolving O in deionized water, stirring until the O is completely dissolved, then adding a urea aqueous solution, stirring and mixing uniformly, carrying out hydrothermal reaction, cooling after the reaction is finished, centrifuging, washing, and drying to obtain MgAl-LDH;
(2)Bi24O31Br10preparing a/MgAl-LDH composite photocatalyst:
MgAl-LDH and Bi (NO)3)2·5H2O is dissolved inAdding alcohol and stirring until the solution is completely dissolved, then adding a KBr aqueous solution, stirring until the solution is uniformly mixed, then adding ethanolamine, stirring and uniformly mixing, carrying out hydrothermal reaction, cooling after the reaction is finished, centrifuging, washing and drying to obtain Bi24O31Br10the/MgAl-LDH composite photocatalyst.
3. The Bi according to claim 224O31Br10The preparation method of the/MgAl-LDH composite photocatalyst is characterized in that in the step (1), Mg (NO) is added3)2·6H2O、Al(NO3)3·9H2The mass ratio of O to urea is 1-3: 1: 4.
4. the Bi according to claim 224O31Br10The preparation method of the/MgAl-LDH composite photocatalyst is characterized in that in the step (1), the hydrothermal reaction conditions are as follows: reacting for 12-24 h at 120 ℃.
5. The Bi according to claim 224O31Br10The preparation method of the/MgAl-LDH composite photocatalyst is characterized in that in the step (2), MgAl-LDH and Bi (NO) are adopted3)2·5H2The mass ratio of O is 1: 0.8-3.2.
6. The Bi according to claim 224O31Br10The preparation method of the/MgAl-LDH composite photocatalyst is characterized in that in the step (2), Bi (NO) is added3)2·5H2The mass ratio of O to KBr is 6-10: 2.25.
7. the Bi according to claim 224O31Br10The preparation method of the/MgAl-LDH composite photocatalyst is characterized in that in the step (2), Bi (NO) is added3)2·5H2The dosage ratio of O to ethanolamine is 6-10 mmol: 1.2 mL.
8. The method of claim 2Bi of (B)24O31Br10The preparation method of the/MgAl-LDH composite photocatalyst is characterized in that in the step (2), the hydrothermal reaction conditions are as follows: the reaction was carried out at 160 ℃ for 12 h.
9. The compound of claim 1, wherein Bi is24O31Br10/MgAl-LDH composite photocatalyst for photocatalytic conversion of CO2The use of (1).
10. Use according to claim 9, characterized in that said use is: irradiating with xenon lamp, adding deionized water, triethanolamine and Bi24O31Br10Adding the/MgAl-LDH composite photocatalyst into a photoreactor, and reacting in the presence of CO2And reacting under a gas atmosphere.
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