CN107433196B - Bismuth oxide-bismuth vanadate heterojunction and preparation method and application thereof - Google Patents
Bismuth oxide-bismuth vanadate heterojunction and preparation method and application thereof Download PDFInfo
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- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical compound [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title abstract description 10
- MBIDWOISWGGCJD-UHFFFAOYSA-N [O].[Bi].[Bi] Chemical compound [O].[Bi].[Bi] MBIDWOISWGGCJD-UHFFFAOYSA-N 0.000 title description 2
- 239000007864 aqueous solution Substances 0.000 claims abstract description 58
- 238000010438 heat treatment Methods 0.000 claims abstract description 44
- 239000002243 precursor Substances 0.000 claims abstract description 42
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- 150000001621 bismuth Chemical class 0.000 claims abstract description 26
- 238000001354 calcination Methods 0.000 claims abstract description 21
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 16
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 230000015556 catabolic process Effects 0.000 claims abstract description 6
- 238000006731 degradation reaction Methods 0.000 claims abstract description 6
- 229940039748 oxalate Drugs 0.000 claims description 12
- 239000012153 distilled water Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 230000035484 reaction time Effects 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 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 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- JHXKRIRFYBPWGE-UHFFFAOYSA-K bismuth chloride Chemical compound Cl[Bi](Cl)Cl JHXKRIRFYBPWGE-UHFFFAOYSA-K 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 claims description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 5
- 229930195725 Mannitol Natural products 0.000 claims description 5
- 235000010355 mannitol Nutrition 0.000 claims description 5
- 239000000594 mannitol Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- CMZUMMUJMWNLFH-UHFFFAOYSA-N sodium metavanadate Chemical compound [Na+].[O-][V](=O)=O CMZUMMUJMWNLFH-UHFFFAOYSA-N 0.000 claims description 4
- ZNCPFRVNHGOPAG-UHFFFAOYSA-L sodium oxalate Chemical compound [Na+].[Na+].[O-]C(=O)C([O-])=O ZNCPFRVNHGOPAG-UHFFFAOYSA-L 0.000 claims description 4
- 229940039790 sodium oxalate Drugs 0.000 claims description 4
- 229910000166 zirconium phosphate Inorganic materials 0.000 claims description 4
- PAJMKGZZBBTTOY-UHFFFAOYSA-N 2-[[2-hydroxy-1-(3-hydroxyoctyl)-2,3,3a,4,9,9a-hexahydro-1h-cyclopenta[g]naphthalen-5-yl]oxy]acetic acid Chemical compound C1=CC=C(OCC(O)=O)C2=C1CC1C(CCC(O)CCCCC)C(O)CC1C2 PAJMKGZZBBTTOY-UHFFFAOYSA-N 0.000 claims description 3
- IRXRGVFLQOSHOH-UHFFFAOYSA-L dipotassium;oxalate Chemical compound [K+].[K+].[O-]C(=O)C([O-])=O IRXRGVFLQOSHOH-UHFFFAOYSA-L 0.000 claims description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims 1
- 239000004065 semiconductor Substances 0.000 description 6
- 239000002073 nanorod Substances 0.000 description 5
- 230000001699 photocatalysis Effects 0.000 description 5
- 230000000593 degrading effect Effects 0.000 description 4
- 238000007146 photocatalysis Methods 0.000 description 4
- 239000011941 photocatalyst Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 206010034972 Photosensitivity reaction Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002050 diffraction method Methods 0.000 description 1
- 238000001493 electron microscopy Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 231100001240 inorganic pollutant Toxicity 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000002135 nanosheet Substances 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 230000036211 photosensitivity Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000006862 quantum yield reaction Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004621 scanning probe microscopy Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000013169 thromboelastometry Methods 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
- 238000002371 ultraviolet--visible spectrum Methods 0.000 description 1
Images
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/20—Vanadium, niobium or tantalum
- B01J23/22—Vanadium
-
- B01J35/39—
Abstract
The invention discloses a Bi2O3‑Bi2VO5.5A heterojunction and a preparation method and application thereof, wherein the preparation method comprises the following steps: mixing a bismuth salt aqueous solution and an oxalate aqueous solution, and heating for reaction to obtain a first precursor; mixing the first precursor, an alcohol aqueous solution, bismuth salt and vanadate, and heating to react to obtain a second precursor; calcining the second precursor to obtain Bi2O3‑Bi2VO5.5A heterojunction. Prepared Bi2O3‑Bi2VO5.5The heterojunction can degrade high concentration phenol in the short time, and degradation efficiency is high, can reuse moreover, and the utilization efficiency is high.
Description
Technical Field
The invention relates to the field of photocatalysis, in particular to Bi2O3-Bi2VO5.5Heterojunction and its preparation method and application.
Background
The photocatalysis technology can effectively degrade organic and partial inorganic pollutants and the like inThe fields of energy and environment are more and more widely regarded, and the semiconductor photocatalysis technology is one of effective ways for solving the problem. However, single semiconductor photocatalysts are relatively inefficient in their quantum efficiency, mainly due to their inherent drawbacks, such as rapid recombination of photo-generated electron-hole pairs (short lifetime), limited range of photo-response, etc., resulting in low photocatalytic activity. A large number of research results show that the construction of a heterostructure is one of the most effective ways to improve the quantum efficiency of semiconductor photocatalysts. The semiconductor heterojunction structure perfectly combines the advantages of semiconductors with different functions, not only widens the light range of the heterojunction catalyst, but also forms an energy level step at the interface due to the difference of energy bands, thereby being beneficial to the rapid separation and transfer of photo-generated electron-hole pairs and further improving the quantum yield of the photocatalyst. Hitherto famous composite semiconductor TiO2Titanic acid and ZnO are widely used in photocatalysis due to their characteristics of high photosensitivity, no toxicity, naturalness, low cost and environmental protection. However, most of them can only absorb 4% of the ultraviolet light in the solar spectrum due to their wide band gap. The development of new highly efficient visible light catalysts for effective use of visible light remains a significant challenge for practical and commercial applications.
Disclosure of Invention
The object of the present invention is to provide a Bi2O3-Bi2VO5.5Heterojunction, preparation method and application thereof, and prepared Bi2O3-Bi2VO5.5The heterojunction can degrade high concentration phenol in the short time, and degradation efficiency is high, can reuse moreover, and the utilization efficiency is high.
In order to achieve the above object, the present invention provides Bi2O3-Bi2VO5.5A method of fabricating a heterojunction, the method comprising:
(1) mixing a bismuth salt aqueous solution and an oxalate aqueous solution, and heating for reaction to obtain a first precursor;
(2) mixing the first precursor, an alcohol aqueous solution, bismuth salt and vanadate, and heating to react to obtain a second precursor;
(3) calcining the second precursor to obtain Bi2O3-Bi2VO5.5A heterojunction.
The invention also provides Bi2O3-Bi2VO5.5Heterojunction of said Bi2O3-Bi2VO5.5The heterojunction is prepared by the preparation method.
The invention also provides the Bi2O3-Bi2VO5.5Use of a heterojunction in the degradation of phenol.
According to the technical scheme, the invention provides Bi2O3-Bi2VO5.5A heterojunction and a preparation method and application thereof, wherein the preparation method comprises the following steps: mixing a bismuth salt aqueous solution and an oxalate aqueous solution, and heating for reaction to obtain a first precursor; mixing the first precursor, an alcohol aqueous solution, bismuth salt and vanadate, and heating to react to obtain a second precursor; calcining the second precursor to obtain Bi2O3-Bi2VO5.5A heterojunction. During the reaction, Bi is formed2VO5.5Nanoparticles were attached to Bi (OHC) by hydrothermal method2O4)·2H2Surface of O nano rod and generation of Bi2VO5.5-Bi(OHC2O4)·2H2O heterojunction obtained by calcining to obtain Bi2O3-Bi2VO5.5Heterojunction, Bi produced by the above method2O3-Bi2VO5.5The heterojunction can degrade phenol in a short time, has high degradation efficiency, can be repeatedly utilized, has high utilization efficiency, and is simple in preparation method and suitable for wide popularization.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 shows Bi2O3-Bi2VO5.5Powder diffraction pattern (XRD) of the heterojunction;
FIG. 2 shows a first precursor Bi (OHC) prepared in example 12O4)·2H2Electron scanning micrograph (SEM) of O nanorods;
FIG. 3 is Bi2O3-Bi2VO5.5Electron scanning microscopy (SEM) of the heterojunction;
FIG. 4 shows Bi2O3-Bi2VO5.5Transmission images (TEMs) of the heterojunctions;
FIG. 5 shows Bi2O3-Bi2VO5.5A heterojunction ultraviolet-visible diffuse reflectance spectrogram;
FIG. 6 shows Bi2O3-Bi2VO5.5The ultraviolet-visible spectrum of phenol is degraded by heterojunction visible light catalysis;
FIG. 7 shows Bi2O3-Bi2VO5.5And the heterojunction is used for repeatedly utilizing the phenol photocatalytic degradation.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a Bi2O3-Bi2VO5.5A method of fabricating a heterojunction, the method comprising:
(1) mixing a bismuth salt aqueous solution and an oxalate aqueous solution, and heating for reaction to obtain a first precursor;
(2) mixing the first precursor, an alcohol aqueous solution, bismuth salt and vanadate, and heating to react to obtain a second precursor;
(3) calcining the second precursor to obtain Bi2O3-Bi2VO5.5A heterojunction.
In a preferred embodiment of the present invention, Bi is preferably used for obtaining Bi2O3-Bi2VO5.5And the capacity of the heterojunction for degrading phenol is further improved, and the bismuth salt aqueous solution and the oxalate aqueous solution are mixed according to the volume ratio of 1: 1, mixing;
the first precursor is used in an amount of 0.1 to 1 part by weight, the bismuth salt is used in an amount of 0.005 to 0.05 part by weight, and the vanadate is used in an amount of 0.01 to 0.05 part by weight, based on 1 part by weight of the aqueous alcohol solution;
the mass concentration of the bismuth salt aqueous solution is 0.1-0.2g/mL, the mass concentration of the oxalate aqueous solution is 0.01-0.1g/mL, and the mass concentration of the alcohol aqueous solution is 0.0025-0.1 g/mL.
In a preferred embodiment of the present invention, Bi is preferably used for obtaining Bi2O3-Bi2VO5.5And a heterojunction, wherein the capacity of the heterojunction for degrading phenol is further improved, and the oxalate aqueous solution is selected from a sodium oxalate aqueous solution and/or a potassium oxalate aqueous solution.
In a preferred embodiment of the present invention, Bi is preferably used for obtaining Bi2O3-Bi2VO5.5And a heterojunction, wherein the capacity of the heterojunction for degrading phenol is further improved, and the aqueous solution of the alcohol is one or more selected from the group consisting of aqueous mannitol solution, aqueous ethanol solution and aqueous ethylene glycol solution.
In a preferred embodiment of the present invention, Bi is preferably used for obtaining Bi2O3-Bi2VO5.5A heterojunction, and the capacity of the heterojunction for degrading phenol is further improved, wherein the bismuth salt in the step (1)The aqueous solution is selected from bismuth chloride aqueous solution and/or bismuth nitrate aqueous solution;
the bismuth salt in the step (2) is selected from bismuth chloride and/or bismuth nitrate;
the vanadate in the step (3) is selected from sodium vanadate and/or potassium metavanadate.
In a preferred embodiment of the present invention, in order to further optimize the reaction conditions, in step (1), the conditions of heating the reaction include: the heating reaction temperature is 100-150 ℃, and the heating reaction time is 30-40 h;
in the step (2), the conditions for heating the reaction include: the heating reaction temperature is 100-180 ℃, and the heating reaction time is 10-24 h.
In a preferred embodiment of the invention, in order to produce Bi2VO5.5Nanoparticles can be uniformly attached to generated Bi (OHC)2O4)·2H2The method for mixing the bismuth salt and the O nanorod comprises the following steps of (1) dropwise adding an oxalate aqueous solution into the bismuth salt aqueous solution, after the heating reaction is finished, sequentially washing the bismuth salt aqueous solution with distilled water and ethanol, and drying to obtain a first precursor;
in the step (2), the mixing method comprises the steps of dissolving the first precursor and the bismuth salt in the aqueous solution of the alcohol, adding the vanadate, washing the mixture with distilled water and ethanol in sequence after the heating reaction is finished, and drying the mixture to obtain the second precursor.
In a preferred embodiment of the invention, in order to obtain Bi2VO5.5-Bi(OHC2O4)·2H2The O heterojunction can be fully calcined to produce Bi2O3-Bi2VO5.5A heterojunction, in step (3), the conditions of calcination include: the calcining temperature is 300-500 ℃, and the calcining time is 1-3 h.
The invention also provides Bi2O3-Bi2VO5.5A heterojunction, characterized in that said Bi2O3-Bi2VO5.5Heterojunction produced by the method of any of claims 1 to 8And (5) obtaining the product.
The invention also provides the Bi2O3-Bi2VO5.5Use of a heterojunction in the degradation of phenol.
The present invention will be described in detail below by way of examples.
Example 1
Dropwise adding a sodium oxalate aqueous solution (with the mass concentration of 0.01g/mL) into a bismuth nitrate aqueous solution (with the mass concentration of 0.1g/mL), after the heating reaction is finished (the heating reaction temperature is 120 ℃, and the heating reaction time is 35 hours), sequentially washing with distilled water and ethanol, and drying to obtain the first precursor; dissolving 0.5g of the first precursor and 0.02g of bismuth nitrate in 1g of mannitol aqueous solution with the mass concentration of 0.05g/mL, adding 0.03g of sodium vanadate, sequentially washing with distilled water and ethanol after the heating reaction (the heating reaction temperature is 140 ℃ and the heating reaction time is 17h) is finished, and drying to obtain the second precursor; calcining the second precursor (the calcining temperature is 400 ℃, and the calcining time is 2h) to obtain Bi2O3-Bi2VO5.5Heterojunction a 1.
Example 2
Dropwise adding a potassium oxalate aqueous solution (with the mass concentration of 0.1g/mL) into a bismuth chloride aqueous solution (with the mass concentration of 0.1g/mL), after the heating reaction is finished (the heating reaction temperature is 100 ℃, and the heating reaction time is 30 hours), sequentially washing with distilled water and ethanol, and drying to obtain the first precursor; dissolving 0.1g of the first precursor and 0.005g of bismuth chloride in 1g of mannitol aqueous solution with the mass concentration of 0.0025g/mL, adding 0.01g of potassium metavanadate, washing with distilled water and ethanol in sequence after the heating reaction (the heating reaction temperature is 100 ℃ and the heating reaction time is 10 hours) is finished, and drying to obtain the second precursor; calcining the second precursor (the calcining temperature is 300 ℃, and the calcining time is 1h) to obtain Bi2O3-Bi2VO5.5Heterojunction a 2.
Example 3
Adding a sodium oxalate aqueous solution (with the mass concentration of 0.05g/mL) dropwise into a bismuth nitrate aqueous solution (with the mass concentration of 0.05g/mL)0.15g/mL), after the heating reaction is finished (the heating reaction temperature is 150 ℃ and the heating reaction time is 40 hours), sequentially washing with distilled water and ethanol, and drying to obtain the first precursor; dissolving 1g of the first precursor and 0.05g of bismuth nitrate in 1g of mannitol aqueous solution with the mass concentration of 0.1g/mL, adding 0.05g of sodium vanadate, sequentially washing with distilled water and ethanol after heating reaction (the heating reaction temperature is 180 ℃ and the heating reaction time is 24h) is finished, and drying to obtain the second precursor; calcining the second precursor (the calcining temperature is 500 ℃, and the calcining time is 3h) to obtain Bi2O3-Bi2VO5.5Heterojunction a 3.
Test example
For the prepared Bi2O3-Bi2VO5.5Heterojunction A1 was subjected to electron microscopy, diffraction analysis and determination of phenol decomposition ability.
FIG. 1 shows Bi2O3-Bi2VO5.5Powder diffraction pattern of the heterojunction; FIG. 2 shows a first precursor Bi (OHC) prepared in example 12O4)·2H2Electron scanning and developing images of the O nanorods; FIG. 3 shows Bi obtained in example 12O3-Bi2VO5.5The electron scanning of the heterojunction shows the image, and the comparison of the figure 2 and the figure 3 shows that the calcined nano-sheet grows on the nano-rod uniformly to form uniform Bi2O3-Bi2VO5.5A heterojunction; FIG. 4 shows Bi obtained2O3-Bi2VO5.5A transmission map of the heterojunction; FIG. 5 shows Bi2O3-Bi2VO5.5A heterojunction ultraviolet-visible diffuse reflectance spectrogram; FIG. 6 shows Bi2O3-Bi2VO5.5The ultraviolet-visible spectrogram of 40mg/L phenol is degraded by heterojunction visible light catalysis, and as can be seen from the ultraviolet-visible spectrogram, the phenol is completely decomposed within 30 min; FIG. 7 shows Bi2O3-Bi2VO5.5The reuse rate of the heterojunction on the 40mg/L phenol photocatalytic degradation is shown in the figure, and the loss rate is only 4% after 5 times of cyclic utilization.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (6)
1. Bi2O3-Bi2VO5.5A method of fabricating a heterojunction, the method comprising:
(1) mixing a bismuth salt aqueous solution and an oxalate aqueous solution, and heating for reaction to obtain a first precursor;
(2) mixing the first precursor, an alcohol aqueous solution, bismuth salt and vanadate, and heating to react to obtain a second precursor;
(3) calcining the second precursor to obtain Bi2O3-Bi2VO5.5A heterojunction; the bismuth salt aqueous solution and the oxalate aqueous solution are mixed according to the volume ratio of 1: 1, mixing;
the first precursor is used in an amount of 0.1 to 1 part by weight, the bismuth salt is used in an amount of 0.005 to 0.05 part by weight, and the vanadate is used in an amount of 0.01 to 0.05 part by weight, based on 1 part by weight of the aqueous alcohol solution;
the mass concentration of the bismuth salt aqueous solution is 0.1-0.2g/mL, the mass concentration of the oxalate aqueous solution is 0.01-0.1g/mL, and the mass concentration of the alcohol aqueous solution is 0.0025-0.1 g/mL; the oxalate aqueous solution is selected from sodium oxalate aqueous solution and/or potassium oxalate aqueous solution; the alcohol aqueous solution is selected from one or more of mannitol aqueous solution, ethanol aqueous solution and glycol aqueous solution; wherein the bismuth salt aqueous solution in the step (1) is selected from a bismuth chloride aqueous solution and/or a bismuth nitrate aqueous solution;
the bismuth salt in the step (2) is selected from bismuth chloride and/or bismuth nitrate;
the vanadate in the step (2) is selected from sodium vanadate and/or potassium metavanadate.
2. The production method according to claim 1, wherein, in the step (1), the conditions for heating the reaction include: the heating reaction temperature is 100-150 ℃, and the heating reaction time is 30-40 h;
in the step (2), the conditions for heating the reaction include: the heating reaction temperature is 100-180 ℃, and the heating reaction time is 10-24 h.
3. The production method according to claim 2, wherein, in step (1), the method of mixing includes: dropwise adding an oxalate aqueous solution into the bismuth salt aqueous solution, after heating reaction is finished, sequentially washing with distilled water and ethanol, and drying to obtain a first precursor;
in step (2), the method of mixing comprises: dissolving the first precursor and the bismuth salt in the aqueous solution of alcohol, adding the vanadate, washing the mixture by using distilled water and ethanol in sequence after the heating reaction is finished, and drying the mixture to obtain the second precursor.
4. The production method according to claim 1 or 2, wherein in step (3), the conditions of calcination include: the calcining temperature is 300-500 ℃, and the calcining time is 1-3 h.
5. Bi2O3-Bi2VO5.5A heterojunction, characterized in that said Bi2O3-Bi2VO5.5The heterojunction is produced by the production method according to any one of claims 1 to 4.
6. The Bi of claim 52O3-Bi2VO5.5Use of a heterojunction in the degradation of phenol.
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