CN111185245A - Graphene oxide loaded bismuth vanadate nanocomposite and preparation method thereof - Google Patents
Graphene oxide loaded bismuth vanadate nanocomposite and preparation method thereof Download PDFInfo
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- 229910052797 bismuth Inorganic materials 0.000 title claims abstract description 54
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 title claims abstract description 54
- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical compound [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 title claims abstract description 54
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 47
- 239000002114 nanocomposite Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 229920000128 polypyrrole Polymers 0.000 claims abstract description 25
- 229910002915 BiVO4 Inorganic materials 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000000243 solution Substances 0.000 claims description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 239000002244 precipitate Substances 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000002131 composite material Substances 0.000 claims description 11
- 239000008367 deionised water Substances 0.000 claims description 11
- 229910021641 deionized water Inorganic materials 0.000 claims description 11
- 238000001291 vacuum drying Methods 0.000 claims description 9
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 239000002243 precursor Substances 0.000 claims description 6
- 229910001868 water Inorganic materials 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 239000012153 distilled water Substances 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 239000000047 product Substances 0.000 claims description 4
- 239000011541 reaction mixture Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 3
- 239000007800 oxidant agent Substances 0.000 claims description 3
- 238000009210 therapy by ultrasound Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 239000012467 final product Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 2
- 230000000593 degrading effect Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000001027 hydrothermal synthesis Methods 0.000 abstract description 4
- 230000001699 photocatalysis Effects 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000000862 absorption spectrum Methods 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 5
- 238000006731 degradation reaction Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 239000011941 photocatalyst Substances 0.000 description 4
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 4
- 229940043267 rhodamine b Drugs 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 4
- 238000002835 absorbance Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
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- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000013032 photocatalytic reaction Methods 0.000 description 2
- 238000001782 photodegradation Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 230000027756 respiratory electron transport chain Effects 0.000 description 2
- 235000010344 sodium nitrate Nutrition 0.000 description 2
- 239000004317 sodium nitrate Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910003206 NH4VO3 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
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- 230000006204 deethylation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
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- 238000005297 material degradation process Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 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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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
- B01J31/36—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of vanadium, niobium or tantalum
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/38—Organic compounds containing nitrogen
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Abstract
The invention discloses a graphene oxide loaded bismuth vanadate nanocomposite and a preparation method thereof, wherein the nanocomposite is prepared from graphene oxide, polypyrrole and bismuth vanadate, and the preparation method comprises the following steps: the doping amount of the graphene oxide is 0.5-10% of the mass of the bismuth vanadate, and the doping amount of the polypyrrole is 0.5-10% of the mass of the bismuth vanadate. The invention adopts a hydrothermal synthesis method to prepare bismuth vanadate, and samples of graphene oxide, polypyrrole and bismuth vanadate are doped to realize BiVO4The obtained graphene oxide loaded bismuth vanadate nano composite material has good effect on degrading pollutantsThe application prospect of (1).
Description
Technical Field
The invention belongs to the technical field of materials, and relates to a graphene oxide loaded bismuth vanadate nanocomposite and a preparation method thereof.
Background
The existing preparation methods of bismuth vanadate include sol-gel method, coprecipitation method, microwave synthesis method, template method and hydrothermal synthesis method. Wherein: water (W)The thermal method reaction takes long time, the reaction rate is relatively slow, and in the preparation process, slight condition changes can generate great effects on the structure and the appearance of the material, so that the properties of the finally obtained sample are affected. Therefore, the temperature, pH value and time for preparing the sample and the doping amount of the composite sample need to be researched on the prepared BiVO4The degree of influence of the material properties.
Disclosure of Invention
The invention aims to provide a graphene oxide loaded bismuth vanadate nanocomposite and a preparation method thereof4The obtained graphene oxide loaded bismuth vanadate nanocomposite has a good application prospect in the aspect of pollutant degradation.
The purpose of the invention is realized by the following technical scheme:
a graphene oxide loaded bismuth vanadate nanocomposite is prepared from graphene oxide, polypyrrole and bismuth vanadate, wherein: the doping amount of the graphene oxide is 0.5-10% of the mass of the bismuth vanadate, and the doping amount of the polypyrrole is 0.5-10% of the mass of the bismuth vanadate.
According to the invention, the photocatalytic rate of the composite material is obtained by representing different doping amounts (0.5%, 1%, 3%, 5% and 10%) of the graphene oxide, and when the doping amount of the graphene oxide is 3% of the mass of the bismuth vanadate, the photocatalyst has the maximum catalytic activity.
According to the invention, by characterizing the photocatalytic rate of the composite material with different polypyrrole doping amounts (0.5%, 1%, 3%, 5% and 10%), when the polypyrrole doping amount is 5% of the mass of the bismuth vanadate, the sample has the best photocatalytic activity.
A preparation method of the graphene oxide loaded bismuth vanadate nanocomposite comprises the following steps:
step 1: preparation of GO/BiVO4Sample preparation:
(1) dropwise adding a NaOH solution into a bismuth vanadate precursor solution, and then adjusting the pH value of the mixed solution to 7;
(2) in BiVO4Adding a GO solution into the mixed solution, and carrying out ultrasonic treatment for 0.5-1.5 h;
(3) placing the solution obtained in the step (2) in a polytetrafluoroethylene high-pressure autoclave, filling 2/3 with deionized water to the volume, sealing, placing in an oven, drying at constant temperature of 160-200 ℃ for 5-8 h, and cooling to normal temperature;
(4) centrifuging the precipitate, washing the precipitate with deionized water for several times, and drying the precipitate in a vacuum drying oven at the temperature of 50-80 ℃ for 10-15 hours to obtain a graphene/bismuth vanadate composite material;
step 2: dissolving pyrrole monomer in H2O is in;
and step 3: mixing GO/BiVO4Placing the sample in the solution obtained in the step (2) for ultrasonic dispersion for 20-30 min;
and 4, step 4: slowly adding an ammonium persulfate solution serving as an oxidant into the mixture obtained in the step 3, controlling the ratio of nPy to nAPS to be 1:1, stirring the product for 10-15 h, and standing for 0.5-1.5 h;
and 5: filtering the reaction mixture, washing the precipitate with distilled water and absolute ethyl alcohol respectively for several times;
step 6: the PPy/GO/BiVO obtained in the step 54And (3) putting the composite material into a vacuum drying oven, and carrying out vacuum drying for 22-25 h at the temperature of 50-80 ℃, wherein the final product is the graphene oxide loaded bismuth vanadate nanocomposite.
According to the invention, a sample of graphene oxide, polypyrrole and bismuth vanadate is doped to realize BiVO4The modification of (1), wherein the doping of the graphene oxide and the polypyrrole changes the reaction path of the bismuth vanadate material for degrading rhodamine B. The concrete functions are as follows:
(1) the graphene oxide has a huge specific surface area, so that the adsorption performance of the catalyst is increased, and the separation of photo-generated electron-hole pairs is facilitated, so that the photocatalytic activity of a composite sample is improved.
(2) The polypyrrole can promote electron transfer and effectively promote the separation of a photon-generated carrier, so that the recombination probability of photon-generated electrons and holes is reduced, more surface reaction active sites are provided for a photocatalytic reaction, and the photocatalytic process is further promoted.
Compared with the prior art, the invention has the following advantages:
1. the method can prepare the high-purity graphene oxide loaded bismuth vanadate nanocomposite, avoids some later procedures, and reduces the generation of impurities.
2. The size and the shape of the graphene oxide loaded bismuth vanadate nanocomposite material prepared by the invention can be adjusted by changing hydrothermal conditions.
3. According to the invention, the graphene oxide loaded bismuth vanadate nanocomposite is prepared by a hydrothermal method, and the hydrothermal method is long in reaction time consumption and slow in reaction rate, so that the prepared powder is relatively complete and relatively high in dispersibility.
4. According to the invention, bismuth vanadate is modified, graphene oxide with different contents is doped, and the prepared GO/BiVO with the doping amount of 3%4Has highest degradation rate on RhB dye and strongest photocatalytic activity.
Drawings
FIG. 1 is a schematic diagram of the preparation of a graphene oxide loaded bismuth vanadate nanocomposite material according to the present invention;
FIG. 2 is BiVO4Degrading the ultraviolet absorption spectrum of RhB;
FIG. 3 shows GO/BiVO4Degrading the ultraviolet absorption spectrum of RhB;
FIG. 4 is a graph showing the photocatalytic degradation curves of samples prepared with different amounts of doped pyrrole;
FIG. 5 shows PPy/GO/BiVO4And degrading the ultraviolet absorption spectrum of the rhodamine B by using the sample.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings, but not limited thereto, and any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be covered by the protection scope of the present invention.
The invention provides a preparation method of a graphene oxide loaded bismuth vanadate nanocomposite, which comprises the following steps of:
step 1: preparing Graphene Oxide (GO) for later use.
Accurately weighing 1.0g of graphite powder and 0.5g of sodium nitrate, and slowly adding the graphite powder and the sodium nitrate into a container containing 23mL of concentrated H2SO4The flask of (1) was thoroughly mixed by vigorously stirring for at least 15min in a water bath, and then 3g of KMnO was slowly added in portions4The temperature of the ice bath is controlled to be 8 ℃, and the water bath kettle is removed after 1 h. And (3) raising the temperature to 35 ℃, then stirring at a constant temperature and a low speed for 2h, slowly adding 50mL of deionized water into the reaction solution, adjusting the temperature to 98 ℃, and then stirring at a constant temperature for 30 min. After the completion of the above reaction, 100mL of deionized water was added to the reaction mixture to terminate the reaction, and then 8mL of 30% H was added2O2And stirring for 30 min. Finally, 40ml of 5% HCl was added to thoroughly wash the solid precipitate until the filtrate was free of SO4 2-Washing with deionized water for 10-20 times until the solution is neutral, and centrifuging to wash the solution (10000 r.min.)-1) Excess acid and by-products are removed. And dispersing the graphite oxide which is neutral after centrifugal washing in 100ml of distilled water, carrying out ultrasonic oscillation stripping for 3h to obtain a solution with better dispersibility, centrifuging for 30min to obtain an upper layer liquid, namely a graphene oxide turbid liquid, and putting the graphene oxide turbid liquid into a vacuum drying oven to be dried at 50 ℃ in vacuum for about 24h to obtain graphene oxide (marked as GO).
Step 2: preparing a bismuth vanadate precursor solution for later use.
Weighed 0.486g of Bi (NO)3)3·5H2Dissolving O in 20mL of 2mol/L HNO3To the solution, solution A was obtained. Weighed 0.118g NH4VO3Dissolved in 20mL of 2mol/L NaOH solution to obtain a solution B. Thereafter, solution B was slowly added dropwise to solution a while stirring for 30 minutes. Then, the pH value is adjusted, and the pH value is adjusted to 7 by dropwise adding prepared 2mol/L NaOH solution. Through the process, a uniformly mixed bright yellow suspension is formed, so that a bismuth vanadate precursor solution can be obtained. Putting bismuth vanadate precursor liquid into a 100mL polytetrafluoroethylene sealed autoclave, filling the autoclave with deionized water to 2/3 of the volume, sealing the autoclave, putting the autoclave into an oven, keeping the temperature at 180 ℃ for 6h, slowly cooling to the normal temperature, centrifuging the precipitate, cleaning the precipitate with deionized water for several times, putting the precipitate into a vacuum drying oven, setting the temperature at 60 DEG CVacuum drying is carried out for about 12 hours, and finally yellow sample bismuth vanadate powder is obtained.
And step 3: preparation of GO/BiVO4Sample preparation:
(1) dropwise adding 2mol/L NaOH solution into the prepared bismuth vanadate precursor solution, and then adjusting the pH value of the mixed solution to 7.
(2) In BiVO4And adding GO solutions with different mass fractions into the mixed solution respectively, and performing ultrasonic treatment for 1 h. Through the above process, a uniformly mixed yellow-green suspension is formed.
(3) And (3) putting the solution in the step (2) into a 100mL polytetrafluoroethylene autoclave, filling 2/3 with deionized water to the volume, sealing, putting into an oven, drying at constant temperature of 180 ℃ for 6h, and slowly cooling to the normal temperature.
(4) And (3) carrying out centrifugal treatment on the precipitate, washing the precipitate for several times by using deionized water, and drying the precipitate in a vacuum drying oven at the temperature of 60 ℃ for about 12 hours to obtain the graphene/bismuth vanadate composite material, wherein the doping amount of the graphene is 0.5%, 1%, 3%, 5% and 10%.
And 4, step 4: dissolving pyrrole monomers with the mass percentages of 3%, 5% and 7% in 20mL of H2O。
And 5: 3% GO/BiVO4The sample was placed in the above solution and dispersed by ultrasound for 25 min.
Step 6: to the above mixture was slowly added 10mL of ammonium persulfate solution as an oxidizer (nPy: nAPS ═ 1: 1). The product was stirred for 12h and then allowed to stand for 1 h.
And 7: the reaction mixture was filtered, and the precipitate was washed several times with distilled water and anhydrous ethanol, respectively.
And 8: PPy/GO/BiVO with different PPy mass ratios can be obtained4The composite material was placed in a vacuum oven and vacuum dried at 60 ℃ for about 24 hours, and the final products were labeled pgb (a), pgb (b), and pgb (c).
The principle of pollutant degradation:
under visible light conditions, the dye rhodamine B was used as the target contaminant to evaluate the catalytic activity of the photocatalyst. And (3) measuring the absorbance of the RhB under different photocatalytic reaction times by using an ultraviolet-visible spectrophotometer, discussing the degradation effect of the prepared photocatalyst, and evaluating the performance of the novel photocatalyst.
Ultraviolet spectrogram analysis of photocatalytic material degradation rhodamine B:
pure BiVO4And 3% GO/BiVO with best photocatalytic activity4For both samples, the ultraviolet absorption spectrum of the degraded RhB was obtained by measuring the absorbance of the dye as a function of the time of the light irradiation during the photodegradation process, as shown in fig. 2 and 3. It can be observed from the ultraviolet absorption spectrum of fig. 2 that the longer the light irradiation time, the lower the absorption intensity of RhB at 553nm, but it can be seen from fig. 3 that the maximum absorption wavelength absorption intensity becomes smaller with the increase of the light irradiation time, and a significant blue shift occurs. This indicates that doping of graphene oxide may make BiVO4The reaction path for degrading RhB is changed, GO/BiVO4The sample is not directly damaged by the conjugated chromogenic structure of RhB, but is caused by the deethylation reaction on the aromatic ring of RhB.
Under simulated natural light irradiation, pollutants are degraded by using RhB dye as a target, and 3% GO/BiVO is investigated4And the photocatalytic activity of the composite samples with different polypyrrole doping amounts of 3%, 5% and 7%. As can be seen from FIG. 4, the ternary composite samples with PPy doping amounts of 3%, 5% and 7% respectively have degradation rates of 77%, 96.8% and 73% respectively under the irradiation of visible light for 120min, while BiVO4The rhB solution can only be degraded by 44.31% under the irradiation of visible light for 160min, and the photocatalytic activity of a sample doped with a proper amount is improved to a great extent. Compared with other samples, the polypyrrole doping amount is 5 percent of PPy/GO/BiVO4The sample had the best photocatalytic activity.
Selecting PPy/GO/BiVO with best catalytic effect of 5 percent4And the change of the ultraviolet absorption spectrum for degrading RhB along with the illumination time in the photodegradation process can be obtained by measuring the absorbance of the dye. As can be seen from fig. 5, the bismuth vanadate sample modified by graphene oxide is more beneficial to the separation of photo-generated electron-hole pairs, and the photocatalytic activity is greatly improved, which also indicates that polypyrrole can actually promote the electron transfer and effectively promote the separation of photo-generated carriers, so BiVO can be significantly improved4Photocatalytic activity of (1).
Claims (6)
1. The graphene oxide loaded bismuth vanadate nanocomposite is characterized in that the nanocomposite is prepared from graphene oxide, polypyrrole and bismuth vanadate, wherein: the doping amount of the graphene oxide is 0.5-10% of the mass of the bismuth vanadate, and the doping amount of the polypyrrole is 0.5-10% of the mass of the bismuth vanadate.
2. The graphene oxide-supported bismuth vanadate nanocomposite material according to claim 1, wherein the doping amount of the graphene oxide is 0.5%, 1%, 3%, 5% or 10% of the mass of the bismuth vanadate.
3. The graphene oxide-supported bismuth vanadate nanocomposite material according to claim 1, wherein the doping amount of the graphene oxide is 3% of the mass of the bismuth vanadate.
4. The graphene oxide-supported bismuth vanadate nanocomposite material according to claim 1, wherein the polypyrrole is doped in an amount of 0.5%, 1%, 3%, 5% or 10% by mass of the bismuth vanadate.
5. The graphene oxide-supported bismuth vanadate nanocomposite material according to claim 1, wherein the doping amount of the polypyrrole is 5% of the mass of the bismuth vanadate.
6. A method for preparing the graphene oxide-supported bismuth vanadate nanocomposite material according to any one of claims 1 to 5, wherein the method comprises the following steps:
step 1: preparation of GO/BiVO4Sample preparation:
(1) dropwise adding a NaOH solution into a bismuth vanadate precursor solution, and then adjusting the pH value of the mixed solution to 7;
(2) in BiVO4Adding a GO solution into the mixed solution, and carrying out ultrasonic treatment for 0.5-1.5 h;
(3) placing the solution obtained in the step (2) in a polytetrafluoroethylene high-pressure autoclave, filling 2/3 with deionized water to the volume, sealing, placing in an oven, drying at constant temperature of 160-200 ℃ for 5-8 h, and cooling to normal temperature;
(4) centrifuging the precipitate, washing the precipitate with deionized water for several times, and drying the precipitate in a vacuum drying oven at the temperature of 50-80 ℃ for 10-15 hours to obtain a graphene/bismuth vanadate composite material;
step 2: dissolving pyrrole monomer in H2O is in;
and step 3: mixing GO/BiVO4Placing the sample in the solution obtained in the step (2) for ultrasonic dispersion for 20-30 min;
and 4, step 4: slowly adding an ammonium persulfate solution serving as an oxidant into the mixture obtained in the step 3, controlling nPy: nAPS to be 1:1, stirring the product for 10-15 h, and then standing for 0.5-1.5 h;
and 5: filtering the reaction mixture, washing the precipitate with distilled water and absolute ethyl alcohol respectively for several times;
step 6: the PPy/GO/BiVO obtained in the step 54And (3) putting the composite material into a vacuum drying oven, and carrying out vacuum drying for 22-25 h at the temperature of 50-80 ℃, wherein the final product is the graphene oxide loaded bismuth vanadate nanocomposite.
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