CN113398971A - Two-dimensional RuNi/g-C3N4Composite photocatalyst and preparation method and application thereof - Google Patents
Two-dimensional RuNi/g-C3N4Composite photocatalyst and preparation method and application thereof Download PDFInfo
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- 239000011941 photocatalyst Substances 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000002131 composite material Substances 0.000 claims abstract description 43
- 239000002135 nanosheet Substances 0.000 claims abstract description 40
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 25
- 239000001257 hydrogen Substances 0.000 claims abstract description 25
- 229910052707 ruthenium Inorganic materials 0.000 claims abstract description 22
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 230000001699 photocatalysis Effects 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011259 mixed solution Substances 0.000 claims abstract description 7
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 5
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 claims abstract description 3
- 150000001875 compounds Chemical class 0.000 claims abstract description 3
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 3
- 229910001453 nickel ion Inorganic materials 0.000 claims abstract description 3
- 239000000758 substrate Substances 0.000 claims abstract description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 34
- 239000000956 alloy Substances 0.000 claims description 17
- 229910045601 alloy Inorganic materials 0.000 claims description 17
- WVDDGKGOMKODPV-UHFFFAOYSA-N Benzyl alcohol Chemical compound OCC1=CC=CC=C1 WVDDGKGOMKODPV-UHFFFAOYSA-N 0.000 claims description 15
- 229910052759 nickel Inorganic materials 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 13
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 11
- 239000002243 precursor Substances 0.000 claims description 8
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 7
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 7
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 7
- DEPMYWCZAIMWCR-UHFFFAOYSA-N nickel ruthenium Chemical compound [Ni].[Ru] DEPMYWCZAIMWCR-UHFFFAOYSA-N 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 235000019445 benzyl alcohol Nutrition 0.000 claims description 5
- 230000035484 reaction time Effects 0.000 claims description 3
- SHWZFQPXYGHRKT-FDGPNNRMSA-N (z)-4-hydroxypent-3-en-2-one;nickel Chemical group [Ni].C\C(O)=C\C(C)=O.C\C(O)=C\C(C)=O SHWZFQPXYGHRKT-FDGPNNRMSA-N 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 239000008098 formaldehyde solution Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- AOPCKOPZYFFEDA-UHFFFAOYSA-N nickel(2+);dinitrate;hexahydrate Chemical compound O.O.O.O.O.O.[Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O AOPCKOPZYFFEDA-UHFFFAOYSA-N 0.000 claims description 2
- BIXNGBXQRRXPLM-UHFFFAOYSA-K ruthenium(3+);trichloride;hydrate Chemical group O.Cl[Ru](Cl)Cl BIXNGBXQRRXPLM-UHFFFAOYSA-K 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 238000001132 ultrasonic dispersion Methods 0.000 claims 1
- 239000003054 catalyst Substances 0.000 abstract description 4
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 4
- 238000005215 recombination Methods 0.000 abstract description 4
- 230000006798 recombination Effects 0.000 abstract description 4
- 239000002105 nanoparticle Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- QHASIAZYSXZCGO-UHFFFAOYSA-N selanylidenenickel Chemical compound [Se]=[Ni] QHASIAZYSXZCGO-UHFFFAOYSA-N 0.000 description 8
- 229910000510 noble metal Inorganic materials 0.000 description 5
- 238000009210 therapy by ultrasound Methods 0.000 description 5
- 229910019891 RuCl3 Inorganic materials 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- YBCAZPLXEGKKFM-UHFFFAOYSA-K ruthenium(iii) chloride Chemical compound [Cl-].[Cl-].[Cl-].[Ru+3] YBCAZPLXEGKKFM-UHFFFAOYSA-K 0.000 description 4
- 238000001291 vacuum drying Methods 0.000 description 4
- 229910009112 xH2O Inorganic materials 0.000 description 4
- CUJRVFIICFDLGR-UHFFFAOYSA-N acetylacetonate Chemical compound CC(=O)[CH-]C(C)=O CUJRVFIICFDLGR-UHFFFAOYSA-N 0.000 description 3
- MGJURKDLIJVDEO-UHFFFAOYSA-N formaldehyde;hydrate Chemical compound O.O=C MGJURKDLIJVDEO-UHFFFAOYSA-N 0.000 description 3
- 239000002086 nanomaterial Substances 0.000 description 3
- 238000003917 TEM image Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000003421 catalytic decomposition reaction Methods 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007146 photocatalysis Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010893 electron trap Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000004298 light response Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000013032 photocatalytic reaction Methods 0.000 description 1
- 238000002256 photodeposition Methods 0.000 description 1
- 238000006303 photolysis reaction Methods 0.000 description 1
- 230000015843 photosynthesis, light reaction Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000000126 substance Substances 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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- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/24—Nitrogen compounds
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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
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/89—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals
- B01J23/892—Nickel and noble metals
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- B01J35/39—Photocatalytic properties
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Abstract
The invention relates to a two-dimensional RuNi/g-C3N4The composite photocatalyst is prepared from quasi-hexagonal two-dimensional RuNi nanoparticles and g-C3N4A compound constructed by nano sheets; the catalyst is in g-C3N4The nano-sheet is taken as a substrate and contains g-C through one-step hydrothermal process3N4And preparing a mixed solution of the nanosheet and ruthenium and nickel ions. The composite photocatalyst has lower recombination efficiency of photo-generated electrons and holes and better hydrogen production performance by photocatalytic water decomposition, and the preparation method and the required equipment are simple, the cost is low, the preparation period is short, and the large-scale production is easy to realizeAnd (4) production.
Description
Technical Field
The invention belongs to the field of composite photocatalysts and preparation and application thereof, and particularly relates to two-dimensional RuNi/g-C3N4A composite photocatalyst and a preparation method and application thereof.
Background
Hydrogen energy is used as non-carbon-based clean energy, and the combustion product is only water, so that the hydrogen energy is expected to become 'terminal energy' used by human beings. In the 21 st century, hydrogen energy development plans are made in China and developed countries such as the United states, European Union and the like, and China has made various progress in the field of hydrogen energy. At present, how to realize low-cost and clean production of hydrogen energy is one of the bottlenecks in development of hydrogen energy. The method is an advanced technology for realizing clean hydrogen energy production, and the key point is to develop a high-efficiency photocatalyst. At present, the non-metallic material g-C3N4The photocatalyst with visible light response is widely applied to photocatalytic water splitting for hydrogen production, has the advantages of simple and convenient preparation method, good chemical stability and the like, and hasThe two-dimensional nano structure is beneficial to photocatalytic reaction. However, g-C3N4The photo-generated electrons and holes generated under illumination are easy to recombine, so that the photocatalysis effect is not ideal.
In order to inhibit the recombination of the photo-generated electron-hole pairs, the efficiency of the photo-catalytic decomposition of water to produce hydrogen is generally improved by loading noble metal Pt on the surface of the photo-generated electron-hole pairs as a promoter. However, the price of Pt is expensive, which severely restricts the application of the photocatalyst in practical production and life. Therefore, it is important to develop a cocatalyst which is relatively inexpensive and can be matched with the structure of the photocatalyst.
The RuNi alloy is used as a cheaper bimetallic material, has a synergistic electronic structure and function, can be used as a cocatalyst of a normal-light photocatalyst, and can effectively improve the photolysis water-splitting hydrogen production performance of the photocatalyst, but the cocatalyst performance of the RuNi alloy is not obviously superior to that of Pt, and the RuNi alloy is usually granular and cannot be matched with a two-dimensional nano photocatalyst. Therefore, more efficient and two-dimensional g-C can be developed3N4The two-dimensional RuNi alloy promoter with the tightly combined nano photocatalyst has definite practical significance.
Patent CN111905788A discloses a NiSe/g-C3N4Preparation method and application of composite photocatalyst material in two-dimensional flaky g-C3N4The method leads the high-dispersion NiSe nano-dots to be tightly connected with g-C3N4On the surface, the average size of NiSe is 10-12nm, and the obtained NiSe/g-C3N4Has good performance. The preparation method is simple, the cost is low, and the prepared NiSe/g-C3N4The composite photocatalyst material has excellent hydrogen production performance under the irradiation of visible light, however, the cluster structure and two-dimensional g-C of NiSe particles in the patent3N4The matching of the photocatalyst is insufficient, and NiSe particles do not form a specific electronic structure, so that the catalytic performance of NiSe is not obviously better than that of a common noble metal, and only g-C is improved3N4The photocatalytic performance of (a).
Disclosure of Invention
The invention aims to overcome the defects of poor catalytic performance of RuNi alloy and poor matching with a two-dimensional photocatalytic material in the prior art, and provides a two-dimensional RuNi/g-C3N4The preparation method is simple, the process parameters are easy to control, large-scale production is easy, the obtained composite catalyst is low in cost, and the composite catalyst has high efficiency and stability of hydrogen production by visible light decomposition water.
The purpose of the invention is realized by the following technical scheme:
two-dimensional RuNi/g-C3N4The composite photocatalyst consists of two-dimensional ruthenium-nickel nanosheet and g-C3N4A compound constructed by nano sheets and formed by g-C3N4The nano sheet is used as a substrate and supports the ruthenium-nickel nano sheet.
The composite photocatalyst is a quasi-hexagonal two-dimensional RuNi nanosheet and a two-dimensional g-C3N4The size of the two-dimensional RuNi nanosheet is 10-40 nm, and the composite photocatalyst has low recombination efficiency of photo-generated electrons and holes and good performance of hydrogen production by photocatalytic water decomposition; the preparation method and the required equipment are simple, the cost is low, the preparation period is short, and the large-scale production is easy.
Preferably, said g-C3N4The mass ratio of the nanosheets to the two-dimensional ruthenium-nickel nanosheets is 20: 1-1: 1. further preferably, said g-C3N4The mass ratio of the nanosheets to the ruthenium-derived nanoparticles is 8: 1-2: 1
Preferably, the molar ratio of ruthenium to nickel is 1: 5-5: 1, further preferably, the molar ratio of ruthenium to nickel is 1: 1.
two-dimensional RuNi/g-C3N4The preparation method of the composite photocatalyst comprises the steps of3N4The mixed solution of the nanosheets and ruthenium and nickel ions is prepared by a one-step hydrothermal method.
Preferably, the method comprises the following steps:
(1) adding a ruthenium source and a nickel source into a solvent to prepare a RuNi alloy precursor solution;
(2) g to C3N4Mixing the nanosheets with the precursor solution obtained in the step (1), placing the nanosheets in a hydrothermal kettle for hydrothermal for a certain time, centrifuging, washing with water, and drying in vacuum to obtain the two-dimensional RuNi/g-C3N4A composite photocatalyst is provided.
Preferably, in the step (1), the ruthenium source and the nickel source are added into benzyl alcohol until the ruthenium source and the nickel source are completely dissolved, then polyvinylpyrrolidone (PVP) is added and ultrasonically dispersed, then a formaldehyde solution is added, and stirring is carried out, so as to obtain the RuNi alloy precursor solution.
Preferably, the molar ratio of the ruthenium source to the nickel source in step (1) is 1: 5-5: 1; further preferably, the molar ratio of the ruthenium source to the nickel source is 1: 1.
preferably, the volume ratio of the benzyl alcohol to the formaldehyde is 100: 1-10: 1; further preferably, the volume ratio of the benzyl alcohol to the formaldehyde is 40: 1-20: 1
The ruthenium source is ruthenium chloride hydrate, and the nickel source is nickel acetylacetonate or nickel nitrate hexahydrate.
Preferably, g to C added in step (2)3N4The mass ratio of the nanosheet to the ruthenium source in the precursor solution is 20: 1-1: 1
Preferably, the hydrothermal temperature in the step (2) is 180-250 ℃, the reaction time is 8-20 h, further preferably, the hydrothermal temperature is 200-220 ℃, and the reaction time is 10-12 h
Two-dimensional RuNi/g-C3N4The composite photocatalyst is applied to photocatalytic water decomposition for hydrogen production.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention has simple process and equipment, easy control of process parameters, low cost and easy large-scale production;
(2) the invention relates to two-dimensional RuNi/g-C3N4The RuNi alloy in the composite photocatalyst has better crystallinity, and a stable electronic structure is arranged between Ru and Ni, so that the synergistic effect between the Ru and the Ni is enhanced, and the composite photocatalyst can be used asAn "electron trap" for trapping electrons, suitable as a high efficiency promoter for photocatalysts;
(3) the invention relates to two-dimensional RuNi/g-C3N4RuNi in the composite photocatalyst exists as a cocatalyst, has an ultrathin two-dimensional nanostructure, and can be compared with a two-dimensional g-C (gamma-C) cocatalyst in the traditional nanoparticle cocatalyst3N4The nano-sheets form a larger area of tight combination, which is beneficial to photo-generated electrons from g-C3N4Fast and efficient transfer to RuNi alloy and capability of reducing photoproduction electron and hole pairs in g-C3N4The recombination efficiency in the process improves the efficiency of the photo-generated electrons participating in the hydrogen production process, and can provide large-area active sites for the hydrogen production process of photo-catalytic decomposition of the aquatic products;
(4) two-dimensional RuNi/g-C prepared by the invention3N4The hydrogen production performance of the composite photocatalyst is compared with that of g-C loaded with noble metal Pt3N4The performance of the photocatalyst is obviously improved, so that the two-dimensional RuNi alloy is an ideal relatively cheap cocatalyst which can replace noble metal Pt in the field of photocatalysis.
Drawings
FIG. 1 is a two-dimensional RuNi/g-C prepared in example 13N4A TEM image of the composite photocatalyst;
FIG. 2 is a two-dimensional RuNi/g-C prepared in example 13N4Composite photocatalyst g-C3N4Nano photocatalyst and Pt/g-C prepared by light deposition method3N4(2 wt% Pt loading) hydrogen production rate is compared;
FIG. 3 is the two-dimensional RuNi/g-C prepared in example 23N4TEM image of composite photocatalyst.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
(1) 29.21mg of RuCl3·xH2O and 36.18mg Ni (acac)2Adding into 30ml benzyl alcohol, stirring to dissolve, adding 150mg PVP, ultrasonic treating for 30min, adding 1ml methanolStirring the aldehyde aqueous solution for 10 min;
(2) 150mg of g-C3N4Adding the nanosheets into the mixed solution, performing ultrasonic treatment and stirring, placing the nanosheets into a 100ml hydrothermal kettle, performing heat preservation at 220 ℃ for 12 hours, cooling, performing centrifugal washing for 3 times, and performing vacuum drying at 60 ℃ for 12 hours to obtain two-dimensional RuNi/g-C3N4A composite photocatalyst is provided.
Subjecting the two-dimensional RuNi/g-C3N4Composite photocatalyst and pure g-C3N4Carrying out photocatalytic hydrogen production on the nanosheets under the following conditions: 10mg of the catalyst was placed in an aqueous solution containing 10 vol% of triethanolamine, a 300W xenon lamp was used as a simulated solar light source, a sample was taken every hour under continuous irradiation of the light source and the hydrogen production was measured by gas chromatography and the rate was calculated.
FIG. 1 shows the two-dimensional RuNi/g-C obtained in this example3N4RuNi alloy in the composite photocatalyst is loaded to g-C in a quasi-hexagonal two-dimensional nanosheet structure3N4The size of the two-dimensional RuNi alloy of the composite material formed on the surface of the nano sheet is about 20 nm.
FIG. 2 shows the two-dimensional RuNi/g-C obtained in this example3N4The composite photocatalyst has good photocatalytic hydrogen production performance, the yield can reach 35100 mu mol/g/h, and the performance is obviously higher than g-C3N4The photocatalytic hydrogen production performance of the nano-sheets is obviously higher than that of Pt/g-C prepared by a photo-deposition method3N4The photocatalytic water splitting hydrogen production performance of the two-dimensional RuNi alloy is obviously better than that of a noble metal Pt cluster.
Example 2
(1) 38.90mg of RuCl3·xH2O and 24.12mg Ni (acac)2Adding into 30ml benzyl alcohol, stirring to dissolve, adding 150mg PVP, ultrasonic treating for 30min, adding 1ml formaldehyde water solution, and stirring for 10 min;
(2) 100mg of g-C3N4Adding the nanosheets into the mixed solution, performing ultrasonic treatment and stirring, placing the nanosheets into a 100ml hydrothermal kettle, performing heat preservation at 220 ℃ for 12 hours, cooling, performing centrifugal washing for 3 times, and performing vacuum drying at 60 ℃ for 12 hours to obtain two-dimensional RuNi/g-C3N4A composite photocatalyst is provided.
In the present example, the amount of the ruthenium source is excessive, and as can be seen from the TEM of FIG. 3, the morphology of the RuNi alloy is obviously changed compared with that of example 1, and the two-dimensional RuNi/g-C3N4The performance of the composite photocatalyst is obviously reduced compared with that of the composite photocatalyst in example 1, and the quasi-hexagonal two-dimensional nano structure and g-C of RuNi alloy are shown3N4The nano-sheet has better coupling property, and is beneficial to the transfer of photo-generated electrons.
Example 3
(1) 19.47mg of RuCl3·xH2O and 24.12mg Ni (acac)2Adding into 30ml benzyl alcohol, stirring to dissolve, adding 200mg PVP, ultrasonic treating for 30min, adding 0.5ml formaldehyde water solution, and stirring for 10 min;
(2) 200mg of g-C3N4Adding the nanosheets into the mixed solution, performing ultrasonic treatment and stirring, placing the nanosheets into a 100ml hydrothermal kettle, performing heat preservation at 200 ℃ for 12 hours, cooling, performing centrifugal washing for 3 times, and performing vacuum drying at 60 ℃ for 12 hours to obtain two-dimensional RuNi/g-C3N4A composite photocatalyst is provided.
Example 4
(1) 29.21mg of RuCl3·xH2O and 40mg Ni (NO)3)2·6H2Adding O into 30ml of benzyl alcohol, stirring until the O is dissolved, then adding 150mg of PVP, carrying out ultrasonic treatment for 30min, then adding 1ml of formaldehyde water solution, and stirring for 10 min;
(2) 100mg of g-C3N4Adding the nanosheets into the mixed solution, performing ultrasonic treatment and stirring, placing the nanosheets into a 100ml hydrothermal kettle, performing heat preservation at 220 ℃ for 12 hours, cooling, performing centrifugal washing for 3 times, and performing vacuum drying at 60 ℃ for 12 hours to obtain two-dimensional RuNi/g-C3N4A composite photocatalyst is provided.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. Two-dimensional RuNi/g-C3N4The composite photocatalyst is characterized by comprising two-dimensional ruthenium-nickel nanosheets and g-C3N4A compound constructed by nano sheets and formed by g-C3N4The nano sheet is used as a substrate and supports the ruthenium-nickel nano sheet.
2. A two-dimensional RuNi/g-C as set forth in claim 13N4The composite photocatalyst is characterized in that g-C3N4The mass ratio of the nanosheets to the two-dimensional ruthenium-nickel nanosheets is 20: 1-1: 1.
3. a two-dimensional RuNi/g-C as set forth in claim 23N4The composite photocatalyst is characterized in that the molar ratio of ruthenium to nickel is 1: 5-5: 1.
4. a two-dimensional RuNi/g-C as defined in claim 13N4The preparation method of the composite photocatalyst is characterized in that the composite photocatalyst contains g-C3N4The mixed solution of the nanosheets and ruthenium and nickel ions is prepared by a one-step hydrothermal method.
5. A two-dimensional RuNi/g-C as set forth in claim 43N4The preparation method of the composite photocatalyst is characterized by comprising the following steps:
(1) adding a ruthenium source and a nickel source into a solvent to prepare a RuNi alloy precursor solution;
(2) g to C3N4Mixing the nanosheets with the precursor solution obtained in the step (1), placing the nanosheets in a hydrothermal kettle for hydrothermal for a certain time, centrifuging, washing with water, and drying in vacuum to obtain the two-dimensional RuNi/g-C3N4A composite photocatalyst is provided.
6.A two-dimensional RuNi/g-C as set forth in claim 53N4The preparation method of the composite photocatalyst is characterized in that in the step (1), a ruthenium source and a nickel source are added into benzyl alcohol until the ruthenium source and the nickel source are completely dissolved, then polyvinylpyrrolidone is added and subjected to ultrasonic dispersion, then a formaldehyde solution is added, and stirring is carried out, so as to obtain a RuNi alloy precursor solution.
7. A two-dimensional RuNi/g-C as set forth in claim 63N4The preparation method of the composite photocatalyst is characterized in that the molar ratio of the ruthenium source to the nickel source in the step (1) is 1: 5-5: 1;
the volume ratio of the benzyl alcohol to the formaldehyde is 100: 1-10: 1;
the ruthenium source is ruthenium chloride hydrate, and the nickel source is nickel acetylacetonate or nickel nitrate hexahydrate.
8. A two-dimensional RuNi/g-C as set forth in claim 53N4The preparation method of the composite photocatalyst is characterized in that g-C added in the step (2)3N4The mass ratio of the nanosheet to the ruthenium source in the precursor solution is 20: 1-1: 1.
9. a two-dimensional RuNi/g-C as set forth in claim 53N4The preparation method of the composite photocatalyst is characterized in that the hydrothermal temperature in the step (2) is 180-250 ℃, and the reaction time is 8-20 h.
10. A two-dimensional RuNi/g-C as defined in claim 13N4The composite photocatalyst is applied to photocatalytic water decomposition for hydrogen production.
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