CN117583001A - BiOBr-Bi 2 O 2 SO 4 Preparation method and application of heterojunction photocatalyst - Google Patents
BiOBr-Bi 2 O 2 SO 4 Preparation method and application of heterojunction photocatalyst Download PDFInfo
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- 239000011941 photocatalyst Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- HWCKGOZZJDHMNC-UHFFFAOYSA-M tetraethylammonium bromide Chemical compound [Br-].CC[N+](CC)(CC)CC HWCKGOZZJDHMNC-UHFFFAOYSA-M 0.000 claims abstract description 18
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims abstract description 18
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 34
- 239000000047 product Substances 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 9
- 238000010276 construction Methods 0.000 claims description 8
- 229910052573 porcelain Inorganic materials 0.000 claims description 8
- 238000009210 therapy by ultrasound Methods 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 6
- 239000002244 precipitate Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 238000005342 ion exchange Methods 0.000 claims description 5
- 238000004090 dissolution Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 claims description 4
- 238000003892 spreading Methods 0.000 claims description 4
- 230000007480 spreading Effects 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 3
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052794 bromium Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 14
- 230000004048 modification Effects 0.000 abstract description 6
- 238000012986 modification Methods 0.000 abstract description 6
- 239000003054 catalyst Substances 0.000 abstract description 5
- 238000011065 in-situ storage Methods 0.000 abstract description 4
- RXPAJWPEYBDXOG-UHFFFAOYSA-N hydron;methyl 4-methoxypyridine-2-carboxylate;chloride Chemical compound Cl.COC(=O)C1=CC(OC)=CC=N1 RXPAJWPEYBDXOG-UHFFFAOYSA-N 0.000 abstract description 3
- 230000031700 light absorption Effects 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 abstract description 3
- 238000007540 photo-reduction reaction Methods 0.000 abstract 2
- 239000003153 chemical reaction reagent Substances 0.000 abstract 1
- 230000009467 reduction Effects 0.000 description 10
- 238000006722 reduction reaction Methods 0.000 description 10
- 230000001699 photocatalysis Effects 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007146 photocatalysis Methods 0.000 description 3
- 238000011946 reduction process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052797 bismuth Inorganic materials 0.000 description 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- CENHPXAQKISCGD-UHFFFAOYSA-N trioxathietane 4,4-dioxide Chemical compound O=S1(=O)OOO1 CENHPXAQKISCGD-UHFFFAOYSA-N 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000031709 bromination Effects 0.000 description 1
- 238000005893 bromination reaction Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009510 drug design Methods 0.000 description 1
- 238000001493 electron microscopy Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
- B01J27/053—Sulfates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/06—Halogens; Compounds thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/80—Type of catalytic reaction
- B01D2255/802—Photocatalytic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/06—Polluted air
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- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
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- Health & Medical Sciences (AREA)
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Abstract
The invention discloses a method for CO 2 Reduced BiOBr-Bi 2 O 2 SO 4 A preparation method and application of heterojunction photocatalyst. The preparation method comprises the following steps: bi is firstly Bi 2 O 2 SO 4 Is prepared by the steps of (1); and secondly, constructing a heterojunction. The invention adopts thiourea and hydrated bismuth nitrate as raw materials to synthesize the photocatalyst Bi 2 O 2 SO 4 The substrate is subjected to in-situ growth modification by taking tetraethylammonium bromide reagent as a material, and the BiOBr-Bi is finally obtained 2 O 2 SO 4 And a heterojunction. The materials selected by the invention are cheap and easy to purchase, and the economic cost is low. The photoreduction catalyst prepared by the method has the advantages of high selectivity, high light absorption efficiency, large material surface area and high stability, and is used as CO 2 A preferred photocatalyst is photoreduction.
Description
Technical Field
The invention relates to the field of preparation of photocatalysts, in particular to a BiOBr-Bi 2 O 2 SO 4 A preparation method and application of heterojunction photocatalyst.
Background
CO produced by fossil fuel combustion 2 The discharge amount is continuously increased, resulting in CO in the air 2 The concentration increases gradually, thereby causing global environmental and climate problems. Among the numerous renewable technologies, the use of photocatalytic technology to exploit the abundance of solar energy to CO 2 Reduction to hydrocarbon fuels and chemicals such as CO, methane, methanol, ethylene, and the like is of great appeal and prospect. However, it is limited by CO 2 High chemical inertness of molecules and CO 2 Complex pathways in reduction processes, photocatalytic CO 2 The activity of reduction remains a challenge. Thus, to increase CO 2 The activity of reduction and the selectivity of the product, which requires a rational design of the photocatalyst. Semiconductor heterojunction interface engineering at CO 2 Plays a critical role in the activation and conversion processes and is one of the effective strategies for high selectivity to hydrocarbon fuels and chemicals.
Bismuth oxysulfate (Bi) 2 O 2 SO 4 ) Having a typical Sillen structure, alternating in structureOf (Bi) 2 O 2 ) 2+ Sum (SO) 4 ) 2- The layer has potential application prospect in photocatalysis. However, bi 2 O 2 SO 4 The controlled synthesis of (c) still faces certain difficulties. And single Bi 2 O 2 SO 4 Limited by the wide band gap and rapid recombination of carriers, its wide application faces a great challenge. The construction of heterojunction can promote the spatial separation of photo-generated carriers and maximally improve the oxidation-reduction capability of the photocatalyst, so that the heterojunction can be widely applied to photocatalysis of CO 2 And (5) reduction. As a laminar alternation ((Bi) 2 O 2 ) 2+ And Br (Br) - Layer) structure of the BiOBr can provide enough space for atom and atom orbit polarization, realize effective separation of electrons and holes, and are commonly used for constructing heterojunction with other photocatalysts. To solve the current CO 2 The reduction efficiency is low, the recycling cost is high, the energy consumption is large, and the Bi is prepared by the preparation method 2 O 2 SO 4 The synthesis of the catalyst is controllable, and the application of the catalyst in the construction of heterojunction is a difficult problem in the existing high-efficiency catalyst development technology.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a BiOBr-Bi 2 O 2 SO 4 Preparation method and application of heterojunction photocatalyst, bi 2 O 2 SO 4 Is a photocatalytic semiconductor material, tetraethylammonium bromide is taken as a bromine source, and BiOBr-Bi is prepared by an in-situ bromination method 2 O 2 SO 4 Heterojunction materials. The heterojunction photocatalyst has the characteristics of stability, reusability, strong reduction and the like.
The invention is realized by the following technical scheme: modified BiOBr-Bi 2 O 2 SO 4 The preparation method of the heterojunction photocatalytic material takes bismuth nitrate, thiourea and tetraethylammonium bromide as raw materials, and forms BiOBr/Bi through rapid ion exchange 2 O 2 SO 4 And a heterojunction.
The preparation method comprises the following steps:
S1 Bi 2 O 2 SO 4 is prepared from the following steps:
s1.1, thiourea is placed in a container, ethanol solution is added, ultrasonic treatment is carried out for 15 to 30 minutes until complete dissolution is achieved, and then ground Bi (NO) is added 3 ) 3 ·5H 2 O, continuing ultrasonic treatment for 15-30 min, taking out, standing at 20-30 ℃ for 30-40 min, filtering and washing with ethanol solution for 3 times after complete precipitation to obtain bright yellow precipitate;
s1.2 spreading the bright yellow precipitate obtained in the step S1.1 in a porcelain cup, then placing the porcelain cup in a muffle furnace, heating to 500 ℃ at 2 ℃/min under the atmosphere, and keeping for 3 hours at 500 ℃ to obtain pure-phase Bi 2 O 2 SO 4 A powder;
s2 construction of heterojunction:
S2.1A certain amount of tetraethylammonium bromide was weighed to prepare 100mL of tetraethylammonium bromide solution, and Bi obtained in S1.2 was recovered 2 O 2 SO 4 Placing the powder in a container, adding 100mL of tetraethylammonium bromide solution into the container, stirring for 2-10 min, obtaining a mixed product after complete ion exchange, washing for multiple times by using ethanol solution, and drying to obtain BiOBr-Bi 2 O 2 SO 4 And a heterojunction.
Preferably, thiourea and Bi (NO in S1.1 3 ) 3 ·5H 2 The mass ratio of O is 1:2 to 5.
Preferably, the mass fractions of the ethanol solutions used in the preparation methods are all 99%.
Preferably, the tetraethylammonium bromide in S2.1 is used as a bromine source and is added in a small amount during the reaction.
Preferably, bi in S2.1 2 O 2 SO 4 And tetraethylammonium bromide in a mass ratio of 1:2 to 3.
Preferably, the ethanol solution in S2.1 is washed three times and then dried in an oven at 60 ℃ for 6 hours.
Preferably, the prepared BiOBr-Bi 2 O 2 SO 4 Heterojunction as CO 2 The reduced photocatalyst is used.
Bismuth nitrate, thiourea and tetraethylammonium bromide are used as raw materials, and heterojunction is formed on the surface of the material through rapid ion exchange reaction, so that the substrate material is modified.
Compared with the prior art, the invention has the beneficial effects that: the modified BiOBr-Bi prepared by the invention 2 O 2 SO 4 The heterojunction photocatalyst has broad-spectrum reduction capability, the microcosmic morphology particles are gradually converted into sheets in the in-situ reduction process, the specific surface area is larger, the construction of the heterojunction widens the light absorption range of the substrate material, the reduction capability can be enhanced, and meanwhile, the heterojunction photocatalyst has the advantages of capability of reducing CO 2 Has certain directivity and can be effectively applied to CO 2 And (5) reduction.
Drawings
FIG. 1 is Bi 2 O 2 SO 4 XRD pattern of (b);
FIG. 2 is a diagram of BiOBr-Bi 2 O 2 SO 4 XRD spectrum of heterojunction;
FIG. 3 is Bi 2 O 2 SO 4 SEM electron microscopy of (a);
FIG. 4 is a diagram of BiOBr-Bi 2 O 2 SO 4 SEM electron microscope image of heterojunction;
FIG. 5 is a diagram of BiOBr-Bi 2 O 2 SO 4 EDS diagram of heterojunction.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
S1 Bi 2 O 2 SO 4 Is prepared from the following steps:
s1.1 firstly, 2.0g of thiourea is weighed, placed in a beaker, 60mL of 99% ethanol solution is added, after ultrasonic treatment in an ultrasonic apparatus for 20min until complete dissolution, 4.0g of ground Bi (NO) is added into the solution 3 ) 3 ·5H 2 O, continuing to carry out ultrasonic treatment for 20min, taking out, standing at 25 ℃ for 30min, filtering and washing with 99% ethanol solution for 3 times after complete precipitation to obtain bright yellow precipitate;
s1.2, weighing 2.0g of the product prepared in the step S1.1, spreading the product in a porcelain cup, putting the porcelain cup in a muffle furnace, heating to 500 ℃ at a speed of 2 ℃/min under the atmosphere, and preserving heat for 3 hours to obtain Bi 2 O 2 SO 4 A product; s2 construction of heterojunction:
s2.1 1 1.5g of tetraethylammonium bromide was weighed to prepare 100mL of solution, and 0.5g of Bi prepared in step S1.2 was weighed 2 O 2 SO 4 Adding the powder into the solution, stirring for 5min, washing with 99% ethanol for three times, and drying in a 60 ℃ oven for 6h to obtain a mixed product.
Comparing FIGS. 1 and 2, bi 2 O 2 SO 4 The crystal form of the material is unchanged before and after modification, which shows that the Bi is treated by tetraethylammonium bromide 2 O 2 SO 4 Is modified without destroying its physical structure.
Fig. 3 is an SEM image of the pure phase of bismuth oxysulfate, with the morphology being nanoparticles. As shown in FIG. 4, bi 2 O 2 SO 4 The appearance of the materials is different before and after modification, which shows that the microscopic appearance particles are gradually transformed into the sheet shape in the in-situ reduction process, the specific surface area of the materials can be enhanced, and more active sites are provided.
As shown in FIG. 5, (a) is modified Bi 2 O 2 SO 4 Distribution of Br element in the material, (b) is modified Bi 2 O 2 SO 4 Distribution of Bi element in the material, and content of Br element: bi element content is about 1:50, illustrating Bi by rapid ion exchange of tetraethylammonium bromide 2 O 2 SO 4 Successful modification and successful construction of BiOBr-Bi 2 O 2 SO 4 The heterojunction, the existence of the heterojunction interface can make the light absorption range wider, thus improve the utilization ratio of light.
Example 2
S1 Bi 2 O 2 SO 4 Is prepared from the following steps:
s1.1 first, weighing2.0g thiourea, placing in a beaker, adding 60mL of 99% ethanol solution, sonicating in a sonicator for 20min until complete dissolution, adding 5.0g of milled Bi (NO 3 ) 3 ·5H 2 O, continuing to carry out ultrasonic treatment for 20min, taking out, standing at 25 ℃ for 30min, filtering and washing with 99% ethanol solution for 3 times after complete precipitation to obtain bright yellow precipitate;
s1.2, weighing 2.0g of the product prepared in the step S1.1, spreading the product in a porcelain cup, putting the porcelain cup in a muffle furnace, heating to 500 ℃ at a speed of 2 ℃/min under the atmosphere, and preserving heat for 3 hours to obtain Bi 2 O 2 SO 4 A product;
s2 construction of heterojunction:
s2.1 1 1.2g of tetraethylammonium bromide was weighed to prepare 100mL of solution, and 0.5g of Bi prepared in step S1.2 was weighed 2 O 2 SO 4 Adding the powder into the solution, stirring for 3min, washing with 99% ethanol for three times, and drying in a 60 ℃ oven for 6h to obtain a mixed product.
Test example 1
10mg of modified BiOBr-Bi was weighed 2 O 2 SO 4 And adding a proper amount of deionized water into the heterojunction, performing ultrasonic treatment for 30min until the heterojunction is completely and uniformly dispersed, and uniformly dispersing the heterojunction on the filter membrane. Transferring into a photocatalysis system, and filling with sufficient CO 2 Under the irradiation of a xenon lamp, the reaction is carried out for 6 hours, the catalytic reduction effect of the gas is recorded every 1 hour, and the test shows that the modified catalyst shows high-efficiency CO 2 The performance of the reduction, which produces mainly CO and methane at a rate of 478. Mu. Mol g -1 h -1 The selectivity of methane production is as high as 80%.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that the above-mentioned preferred embodiment should not be construed as limiting the invention, and the scope of the invention should be defined by the appended claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (7)
1. BiOBr-Bi 2 O 2 SO 4 The preparation method of the heterojunction photocatalyst is characterized by comprising the following steps of: comprises the following steps of the method,
S1 Bi 2 O 2 SO 4 is prepared from the following steps:
s1.1, thiourea is placed in a container, ethanol solution is added, ultrasonic treatment is carried out for 15 to 30 minutes until complete dissolution is achieved, and then ground Bi (NO) is added 3 ) 3 ·5H 2 O, continuing ultrasonic treatment for 15-30 min, taking out, standing at 20-30 ℃ for 30-40 min, filtering and washing with ethanol solution for 3 times after complete precipitation to obtain bright yellow precipitate;
s1.2 spreading the bright yellow precipitate obtained in the step S1.1 in a porcelain cup, then placing the porcelain cup in a muffle furnace, heating to 500 ℃ at 2 ℃/min under the atmosphere, and keeping for 3 hours at 500 ℃ to obtain pure-phase Bi 2 O 2 SO 4 A powder;
s2 construction of heterojunction:
S2.1A certain amount of tetraethylammonium bromide was weighed to prepare 100mL of tetraethylammonium bromide solution, and Bi obtained in S1.2 was recovered 2 O 2 SO 4 Placing the powder in a container, adding 100mL of tetraethylammonium bromide solution into the container, stirring for 2-10 min, obtaining a mixed product after complete ion exchange, washing for multiple times by using ethanol solution, and drying to obtain BiOBr-Bi 2 O 2 SO 4 And a heterojunction.
2. A BiOBr-Bi according to claim 1 2 O 2 SO 4 The preparation method of the heterojunction photocatalyst is characterized by comprising the following steps of: thiourea and Bi (NO) in the S1.1 3 ) 3 ·5H 2 The mass ratio of O is 1:2 to 5.
3. A BiOBr-Bi according to claim 1 2 O 2 SO 4 The preparation method of the heterojunction photocatalyst is characterized by comprising the following steps of: the mass fractions of the ethanol solution used in the preparation method are 99%.
4. According toA BiOBr-Bi as claimed in claim 1 2 O 2 SO 4 The preparation method of the heterojunction photocatalyst is characterized by comprising the following steps of: the tetraethylammonium bromide in S2.1 serves as a bromine source.
5. A BiOBr-Bi according to claim 1 2 O 2 SO 4 The preparation method of the heterojunction photocatalyst is characterized by comprising the following steps of: bi in S2.1 2 O 2 SO 4 And tetraethylammonium bromide in a mass ratio of 1:2 to 3.
6. A BiOBr-Bi according to claim 1 2 O 2 SO 4 The preparation method of the heterojunction photocatalyst is characterized by comprising the following steps of: and (3) washing the ethanol solution in the step S2.1 for three times, and then placing the washed ethanol solution in a 60 ℃ oven for drying for 6 hours.
7. BiOBr-Bi prepared by the preparation method according to any one of claims 1 to 6 2 O 2 SO 4 The application of heterojunction, characterized in that: the BiOBr-Bi 2 O 2 SO 4 Heterojunction as CO 2 The reduced photocatalyst is used.
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| CN118179539A (en) * | 2024-05-14 | 2024-06-14 | 电子科技大学长三角研究院(湖州) | A rare earth metal-doped bismuth oxysulfate photocatalyst, preparation method and application thereof |
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| CN118179539A (en) * | 2024-05-14 | 2024-06-14 | 电子科技大学长三角研究院(湖州) | A rare earth metal-doped bismuth oxysulfate photocatalyst, preparation method and application thereof |
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