CN110180529B - Preparation method for synthesizing photocatalytic material by using MOF as precursor - Google Patents
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- 239000000463 material Substances 0.000 title claims abstract description 34
- 230000001699 photocatalysis Effects 0.000 title claims abstract description 20
- 239000002243 precursor Substances 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 230000002194 synthesizing effect Effects 0.000 title claims abstract description 9
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- 238000000034 method Methods 0.000 claims abstract description 20
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 30
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- 239000000203 mixture Substances 0.000 claims description 13
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- 230000008025 crystallization Effects 0.000 claims description 9
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- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 239000013110 organic ligand Substances 0.000 claims description 6
- 238000003786 synthesis reaction Methods 0.000 claims description 6
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical group [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 claims description 5
- FBXVOTBTGXARNA-UHFFFAOYSA-N bismuth;trinitrate;pentahydrate Chemical group O.O.O.O.O.[Bi+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FBXVOTBTGXARNA-UHFFFAOYSA-N 0.000 claims description 5
- 239000003960 organic solvent Substances 0.000 claims description 5
- QMKYBPDZANOJGF-UHFFFAOYSA-N benzene-1,3,5-tricarboxylic acid Chemical compound OC(=O)C1=CC(C(O)=O)=CC(C(O)=O)=C1 QMKYBPDZANOJGF-UHFFFAOYSA-N 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 3
- 239000012378 ammonium molybdate tetrahydrate Substances 0.000 claims description 3
- 239000012298 atmosphere Substances 0.000 claims description 3
- FIXLYHHVMHXSCP-UHFFFAOYSA-H azane;dihydroxy(dioxo)molybdenum;trioxomolybdenum;tetrahydrate Chemical compound N.N.N.N.N.N.O.O.O.O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O[Mo](O)(=O)=O.O[Mo](O)(=O)=O.O[Mo](O)(=O)=O FIXLYHHVMHXSCP-UHFFFAOYSA-H 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000005216 hydrothermal crystallization Methods 0.000 claims description 2
- 239000012621 metal-organic framework Substances 0.000 abstract description 21
- 238000011160 research Methods 0.000 abstract description 6
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- 239000003814 drug Substances 0.000 description 12
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- 238000001878 scanning electron micrograph Methods 0.000 description 9
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- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
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- 238000001228 spectrum Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 238000001027 hydrothermal synthesis Methods 0.000 description 3
- CXKWCBBOMKCUKX-UHFFFAOYSA-M methylene blue Chemical compound [Cl-].C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 CXKWCBBOMKCUKX-UHFFFAOYSA-M 0.000 description 3
- 229960000907 methylthioninium chloride Drugs 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
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- 238000009210 therapy by ultrasound Methods 0.000 description 3
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- 239000011941 photocatalyst Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000001308 synthesis method Methods 0.000 description 2
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- 229940079593 drug Drugs 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 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 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 229910010272 inorganic material Inorganic materials 0.000 description 1
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- 230000004298 light response Effects 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000001782 photodegradation Methods 0.000 description 1
- 239000012429 reaction media Substances 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
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- 229910009112 xH2O Inorganic materials 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
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
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- 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
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- B01J23/24—Chromium, molybdenum or tungsten
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Abstract
A preparation method of synthesizing a photocatalytic material by using MOF as a precursor belongs to the field of catalysts. According to the invention, MOF is used as a precursor to synthesize the photocatalytic material, firstly, the MOF with a uniform morphology and a stable structure of a bismuth metal organic framework (such as CAU-17) is synthesized, the MOF and a metal salt aqueous solution are stirred under a water bath condition, a mixed solution formed after stirring is centrifugally dried, and the mixed solution is calcined at a certain temperature, so that the photocatalytic material maintaining the MOF appearance framework can be obtained. The method has the advantages of short period, high yield, simple process operation, stable product performance, good catalytic performance and difficult secondary pollution. Is suitable for large-scale mass production and has wider scientific research and practical value.
Description
Technical Field
The invention relates to a preparation method of a photocatalytic material synthesized by using MOF (metal organic framework) as a precursor, belonging to the field of catalysts.
Background
In recent years, visible light response photocatalysts are widely researched, and have bright application prospects in various research fields due to the excellent characteristics of narrow forbidden bandwidth, proper energy band position, stable chemical properties and the like, and particularly, the application of the photocatalyst in the aspects of photodegradation of organic pollutants, photocatalytic decomposition of water and the like becomes a current research hotspot.[1]
At present, the synthesis methods of photocatalytic materials are many and commonHigh temperature solid phase reaction method, chemical precipitation method, sol-gel method, hydrothermal/solvothermal method, microwave-assisted method[2]And the like. The hydrothermal/solvothermal method is a typical method for synthesizing inorganic materials by using water or an organic solvent as a reaction medium, and is an effective method for synthesizing materials by mixing different solutions, putting the mixed solutions into a closed reactor (high-pressure reaction kettle) for heating, and inducing autogenous pressure to form a high-temperature high-pressure environment. Yu J, etc[3]Adopts a solvothermal method to successfully realize BiVO4Uniformly mixing ammonium metavanadate and bismuth nitrate according to a certain proportion, adjusting the pH value, transferring the mixed solution into a reaction kettle, and obtaining BiVO with different shapes according to a certain heating program4. To date, no methods have been reported for synthesizing photocatalytic materials by using MOFs as precursors.
[1]Tan H L,Amal R,Ng Y H.Alternative strategies in improving thephotocatalytic and photoelectrochemical activities of visible light-drivenBiVO 4:a review[J].Journal of Materials Chemistry A,2017,5(32):16498-16521..
[2]Suarez C M,Hernández S,Russo N.BiVO4as photocatalyst for solarfuels production through water splitting:a short review[J].Applied CatalysisA:General,2015,504:158-170.
[3]Yu J,Kudo A.Effects of structural variation on the photocatalyticperformance of hydrothermally synthesized BiVO4[J].Advanced FunctionalMaterials,2006,16(16):2163-2169.
Disclosure of Invention
The invention aims to provide a preparation method and application of a photocatalytic material synthesized by taking MOF as a precursor, and the photocatalytic material prepared by the method, so that the method is widely applied to scientific research and industrial production.
A preparation method of synthesizing a photocatalytic material by taking MOF as a precursor comprises the following steps:
(1) selecting a proper organic solvent as a dispersing agent solution for MOF synthesis;
(2) mixing the soluble organic ligand and the dispersant solution, and magnetically stirring to obtain a clear solution;
(3) mixing and stirring metal ion salt and the solution to fully and uniformly mix the metal ion salt and the solution to obtain a uniform solution;
(4) carrying out hydrothermal crystallization on the mixed solution;
(5) the whole liquid was removed, washed thoroughly, and dried by centrifugation to obtain a metal salt.
(6) Adding metal salt into deionized water, and stirring in a water bath at a certain temperature to obtain a clear solution;
(7) adding the MOF into the solution, uniformly mixing, and continuously stirring in a water bath at the same temperature for a certain time;
(8) removing the whole liquid, fully washing, and centrifugally drying;
(9) calcining the precursor in a muffle furnace in the atmosphere of air;
(10) and collecting the calcined product to obtain the product.
Wherein the organic solvent is an anhydrous methanol solution; the soluble ligand is trimesic acid; the metal ion salt is bismuth nitrate pentahydrate; the metal salt is ammonium metavanadate, ammonium metatungstate and ammonium molybdate tetrahydrate.
Further, in the step (2), the soluble organic ligand and the dispersant solution are mixed according to the proportion of 0.05-0.12mol/L, the mixing temperature is 15-30 ℃, and the mixing time is 5-30 minutes to mix the components evenly.
Further, in the step (3), the mixing ratio of the metal ion salt to the clear solution in the step (2) is 0.01-0.05 mol/L.
Further, in the step (4), the crystallization is performed in a crystallization kettle known in the art. The crystallization conditions may be various conditions commonly used in the art, but preferably, the crystallization conditions include a crystallization temperature of 100 ℃ and 140 ℃ and a crystallization time of 18 to 30 hours.
Further, in the step (5), the centrifugal rotation speed is 6000-; the washing process is that the washing is carried out for 2 to 4 times by using absolute methanol; the drying temperature is 60-80 ℃ and the drying time is 6-24 hours.
Further, in the step (6), the metal salt and the deionized water are mixed according to the proportion of 0.01-0.05mol/L, the water bath temperature is 60 ℃, and the time is 5-10 minutes to mix evenly.
Further, in the step (7), MOF with the proportion of 0.01-0.05mol/L is added, the water bath temperature is 60 ℃, and the stirring time is 2-5 hours.
Further, in the step (8), the centrifugal rotation speed is 6000-; the washing process is that deionized water and absolute ethyl alcohol are alternately washed for 2 to 4 times; the drying temperature is 70 ℃, and the drying time is 6-24 hours.
Further, in the step (9), the temperature rise rate of the calcination is 5-10 ℃/min, the temperature is raised to 450 ℃ and 600 ℃, and the temperature is kept for 2-4 h.
According to the invention, MOF is used as a precursor to synthesize the photocatalytic material, firstly, the MOF with a uniform morphology and a stable structure of a bismuth metal organic framework (such as CAU-17) is synthesized, the MOF and a metal salt aqueous solution are stirred under a water bath condition, a mixed solution formed after stirring is centrifugally dried, and the mixed solution is calcined at a certain temperature, so that the photocatalytic material maintaining the MOF appearance framework can be obtained.
In the material synthesis process, the used process is simple and safe (only hydrothermal synthesis and calcination in air, no vacuum, special calcination atmosphere and other complex environments are involved), the instrument is simple (the main instrument is a beaker, a centrifuge, a hydrothermal box and a muffle furnace), the period is short, the yield is high, and the process operation is simple.
In a word, the synthesis process disclosed by the invention is simple to operate, suitable for large-scale mass production, stable in product performance and not easy to cause secondary pollution. Therefore, the method has wider scientific research and practical value.
The invention has the advantages that:
the preparation method for synthesizing the photocatalytic material by using the MOF as the precursor has the advantages of short synthesis period, suitability for large-scale production, stable structure of the obtained material and good catalytic performance. Therefore, the synthesis method is expected to be widely applied to the research and production of novel catalyst materials.
Drawings
FIG. 1 is an x-ray powder diffraction pattern of example one showing the characteristic diffraction peak of CAU-17;
FIG. 2 is a photograph taken with a scanning electron microscope, showing CAU-17 in the form of a rod;
FIG. 3 is an x-ray powder diffraction pattern of example one, shown as BiVO4Characteristic diffraction peaks of (a);
FIG. 4 is a photograph taken with a scanning electron microscope showing BiVO according to an embodiment4Maintaining the rod-shaped appearance of the precursor;
FIG. 5 is a scanning electron micrograph showing the rod-like 100-200nm small particle composition of the example;
FIG. 6 shows an embodiment of BiVO4Degradation efficiency graph of methylene blue;
FIG. 7 is the second x-ray powder diffraction pattern of example showing Bi2WO6Characteristic diffraction peaks of the main phase;
FIG. 8 is a SEM photograph of a rod-shaped material of the second embodiment;
FIG. 9 is a scanning electron micrograph of the second example showing the rod-like 100-200nm small particle composition;
FIG. 10 is the three x-ray powder diffraction pattern of the example, shown as Bi2Mo3O12Characteristic diffraction peaks of (a);
FIG. 11 is a photograph taken with a scanning electron microscope, showing the rod-like morphology of the material;
fig. 12 is a scanning electron micrograph.
Detailed description of the preferred embodiments.
Embodiments of the present invention will be described in detail with reference to examples. It will be appreciated by those skilled in the art that the following examples are only preferred embodiments of the invention to facilitate a better understanding of the invention and therefore should not be taken as limiting the scope of the invention. Various modifications and changes may be made by those skilled in the art, and any modification, equivalent replacement or improvement made without departing from the spirit and principle of the present invention should be covered within the protection scope of the present invention. The experimental methods in the following examples are all conventional methods unless otherwise specified; the experimental materials used, unless otherwise specified, were purchased from conventional biochemical manufacturers.
The centrifugation in the following examples was performed using a bench-top high speed centrifuge (XiangYi H-1650); the scanning electron microscope image is obtained by a cold field emission scanning electron microscope (Hitachi S-4800); the X-ray diffraction spectrum was obtained by a powder X-ray diffractometer (HitachiU-3010).
The first embodiment is as follows:
at 25 deg.C, 1.5g of terephthalic acid (H) was weighed3BTC), taking a clean beaker, measuring 60mL of absolute methanol, adding weighed medicine into the beaker, putting the beaker into an ultrasonic machine for ultrasonic treatment to fully disperse the medicine in the absolute methanol solution, mixing and stirring until the medicine is completely dissolved, weighing 0.3g of bismuth nitrate pentahydrate into the beaker after the middle solution is uniformly dissolved, uniformly stirring, pouring the solution into a plurality of reaction kettles in equal amount after the solution is uniformly dissolved, then putting the reaction kettles into a hydrothermal box, and reacting for 24 hours at 120 ℃. After the reaction is finished, centrifuging the product at 10000r/min for 5 minutes, and drying the product in an oven at 60 ℃ for 12 hours to finally obtain the BiMOF material, wherein an x-ray powder diffraction spectrum (figure 1) of the BiMOF material shows a characteristic diffraction peak of CAU-17, and a scanning electron microscope photo (figure 2) shows that the material presents a rod-shaped appearance. 0.1053g of ammonium metavanadate (NH) were weighed out4VO3) Taking a clean beaker, measuring 50mL of deionized water, adding weighed medicines into the beaker, stirring the mixture in a water bath at 60 ℃ until the mixture is clear, weighing 0.5022g of the synthesized BiMOF, adding the synthesized BiMOF into the beaker, continuously stirring the mixture in the water bath at 60 ℃ for 3 hours, centrifuging the mixed solution at 10000r/min for 2 minutes, drying the mixture in a 70 ℃ oven for 12 hours, heating the mixture to 450 ℃ at 5 ℃/min in a muffle furnace, and keeping the temperature for 2 hours for calcination to obtain yellow powder BiVO4. The X-ray powder diffraction spectrum (figure 3) of the compound is shown as BiVO4Characteristic diffraction peaks of (a); scanning electron micrographs (fig. 4) show that the material exhibits a rod-like morphology; the scanning electron micrograph (FIG. 5) shows the rod-like structure of the small particles of 100-200nm, and BiVO is shown in FIG. 44The length of the rod is about 2-5 μm. And BiVO as shown in FIG. 64The efficiency chart of degrading methylene blue is shown in a 300W xenon lamp with the wavelength of a filter<420nm, and about 95 percent of methylene blue can be degraded within 40min under irradiation.
Example two
At 25 deg.C, 1.5g of terephthalic acid (H) was weighed3BTC), taking a clean beaker, measuring 60mL of absolute methanol, adding weighed medicine into the beaker, putting the beaker into an ultrasonic machine for ultrasonic treatment to fully disperse the medicine in the absolute methanol solution, mixing and stirring until the medicine is completely dissolved, weighing 0.3g of bismuth nitrate pentahydrate into the beaker after the middle solution is uniformly dissolved, uniformly stirring, pouring the solution into a plurality of reaction kettles in equal amount after the solution is uniformly dissolved, then putting the reaction kettles into a hydrothermal box, and reacting for 24 hours at 120 ℃. And after the reaction is finished, centrifuging the product at 10000r/min for 5 minutes, and drying the product in an oven at 60 ℃ for 12 hours to finally obtain the BiMOF material. 0.2216g of ammonium metatungstate ((NH) were weighed4)6H2W12O40·xH2O), taking a clean beaker, measuring 50mL of deionized water, adding the weighed medicine, stirring in a 60 ℃ water bath until the mixture is clear, weighing 0.5022g of the synthesized BiMOF, adding the synthesized BiMOF into the beaker, continuing stirring in the 60 ℃ water bath for 3h, centrifuging the mixed solution for 2 min at 10000r/min, drying the mixed solution in a 70 ℃ oven for 12h, heating the mixed solution to 450 ℃ in a muffle furnace at the speed of 5 ℃/min, and keeping the temperature for 2h for calcination to obtain the product. Its x-ray powder diffraction spectrum (FIG. 7) shows Bi2WO6Characteristic diffraction peaks of the main phase; scanning electron micrographs (fig. 8) show that the material exhibits a rod-like morphology; the scanning electron micrograph (FIG. 9) shows the rod-like structure of the small particles of 100-200nm, and as shown in FIG. 8, the length of the rod-like structure is about 2-5 μm.
EXAMPLE III
At 25 deg.C, 1.5g of terephthalic acid (H) was weighed3BTC), taking a clean beaker, measuring 60mL of absolute methanol, adding weighed medicine into the beaker, putting the beaker into an ultrasonic machine for ultrasonic treatment to fully disperse the medicine in the absolute methanol solution, mixing and stirring until the medicine is completely dissolved, weighing 0.3g of bismuth nitrate pentahydrate into the beaker after the middle solution is uniformly dissolved, uniformly stirring, pouring the solution into a plurality of reaction kettles in equal amount after the solution is uniformly dissolved, then putting the reaction kettles into a hydrothermal box, and reacting for 24 hours at 120 ℃. And after the reaction is finished, centrifuging the product at 10000r/min for 5 minutes, and drying the product in an oven at 60 ℃ for 12 hours to finally obtain the BiMOF material. BalanceAn amount of 0.5308g ammonium molybdate tetrahydrate (H)32Mo7N6O28) Taking a clean beaker, measuring 50mL of deionized water, adding a weighed medicine, stirring in a 60 ℃ water bath until the mixture is clear, weighing 0.5022g of the synthesized BiMOF, adding the synthesized BiMOF into the beaker, continuing stirring in the 60 ℃ water bath for 3 hours, centrifuging the mixed solution for 2 minutes at 10000r/min, drying in a 70 ℃ oven for 12 hours, heating to 450 ℃ at 5 ℃/min in a muffle furnace, and keeping the temperature for 2 hours for calcination to obtain the product. Its x-ray powder diffraction spectrum (FIG. 10) shows Bi2Mo3O12Characteristic diffraction peaks of (a); scanning electron micrographs (FIG. 11) show that the material exhibits a rod-like morphology; the scanning electron micrograph (FIG. 12) shows the rod-like structure of the small particles of 100-200nm, and as shown in FIG. 11, the length of the rod-like structure is about 2-5 μm.
The applicant declares that the present invention is described by the above embodiments as the detailed features and the detailed methods of the present invention, but the present invention is not limited to the above detailed features and the detailed methods, that is, it is not meant that the present invention must be implemented by relying on the above detailed features and the detailed methods. It will be apparent to those skilled in the art that any modification of the invention, equivalent substitutions of selected components and additions of auxiliary components, selection of specific modes, etc., and other variations within the knowledge of one skilled in the art without departing from the spirit of the invention, fall within the scope and disclosure of the invention.
Claims (5)
1. A preparation method of synthesizing a photocatalytic material by using MOF as a precursor is characterized by comprising the following preparation steps:
(1) selecting a proper organic solvent as a dispersing agent solution for MOF synthesis;
(2) mixing the soluble organic ligand and the dispersant solution, and magnetically stirring to obtain a clear solution;
(3) mixing and stirring metal ion salt and the solution to fully and uniformly mix the metal ion salt and the solution to obtain a uniform mixed solution;
(4) carrying out hydrothermal crystallization on the mixed solution;
(5) removing the whole liquid, fully washing, and centrifugally drying to obtain the MOF;
(6) adding metal salt into deionized water, and stirring in a water bath at a certain temperature to obtain a clear solution;
(7) adding the MOF into the solution, uniformly mixing, and continuously stirring in a water bath at the same temperature for a certain time;
(8) removing the whole liquid, fully washing, and centrifugally drying;
(9) calcining the precursor in a muffle furnace in the atmosphere of air;
(10) collecting the calcined product to obtain a product;
wherein the organic solvent is an anhydrous methanol solution; the soluble organic ligand is trimesic acid; the metal ion salt is bismuth nitrate pentahydrate; the metal salt is ammonium metavanadate, ammonium metatungstate and ammonium molybdate tetrahydrate;
wherein, the crystallization conditions in the step (4) comprise that the crystallization temperature is 100-140 ℃, and the crystallization time is 18-30 hours;
wherein, in the step (6), the metal salt and the deionized water are mixed according to the proportion of 0.01-0.05mol/L, the water bath temperature is 60 ℃, and the time is 5-10 minutes to uniformly mix the metal salt and the deionized water;
wherein, in the step (7), MOF with the proportion of 0.01-0.05mol/L is added, the water bath temperature is 60 ℃, and the stirring time is 2-5 hours;
wherein, in the step (9), the temperature rise rate of the calcination is 5-10 ℃/min, the temperature is raised to 450-600 ℃, and the temperature is kept for 2-4 h.
2. The method for preparing the precursor synthesized photocatalytic material from the MOF according to claim 1, wherein in the step (2), the soluble organic ligand and the dispersant solution are mixed according to the proportion of 0.05-0.12mol/L, the mixing temperature is 15-30 ℃, and the mixing time is 5-30 minutes to uniformly mix the soluble organic ligand and the dispersant solution.
3. A method for preparing a precursor synthesis photocatalytic material of MOF of claim 1, wherein the metal ion salt is mixed with the clear solution of step (2) at a ratio of 0.01-0.05 mol/L.
4. The method for preparing the precursor synthesized photocatalytic material from the MOF according to claim 1, wherein in the step (5), the centrifugal rotation speed is 6000-10000 rpm, and the centrifugal time is 5-10 minutes; the washing process is that the washing is carried out for 2 to 4 times by using absolute methanol; the drying temperature is 60-80 ℃ and the drying time is 6-24 hours.
5. The method for preparing the precursor synthesized photocatalytic material from the MOF according to claim 1, wherein in the step (8), the centrifugal rotation speed is 6000-10000 rpm, and the centrifugal time is 2-5 minutes; the washing process is that deionized water and absolute ethyl alcohol are alternately washed for 2 to 4 times; the drying temperature is 70 ℃, and the drying time is 6-24 hours.
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