CN118062813A - Preparation method and application of polytriazinyl crystalline phase carbon nitride nanosheets - Google Patents
Preparation method and application of polytriazinyl crystalline phase carbon nitride nanosheets Download PDFInfo
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- CN118062813A CN118062813A CN202311716551.3A CN202311716551A CN118062813A CN 118062813 A CN118062813 A CN 118062813A CN 202311716551 A CN202311716551 A CN 202311716551A CN 118062813 A CN118062813 A CN 118062813A
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- polytriazinyl
- triazinyl
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- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 239000002135 nanosheet Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims abstract description 24
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 22
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 20
- 150000003839 salts Chemical class 0.000 claims abstract description 19
- 230000001699 photocatalysis Effects 0.000 claims abstract description 14
- 125000004306 triazinyl group Chemical group 0.000 claims abstract description 13
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000001257 hydrogen Substances 0.000 claims abstract description 12
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 12
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 11
- 239000001103 potassium chloride Substances 0.000 claims abstract description 11
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011780 sodium chloride Substances 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 24
- 239000002064 nanoplatelet Substances 0.000 claims description 19
- 239000000843 powder Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 14
- 229920000642 polymer Polymers 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 4
- 239000003054 catalyst Substances 0.000 abstract description 9
- 239000000969 carrier Substances 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000005012 migration Effects 0.000 abstract description 5
- 238000013508 migration Methods 0.000 abstract description 5
- 238000000926 separation method Methods 0.000 abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 238000003786 synthesis reaction Methods 0.000 abstract 1
- 239000003708 ampul Substances 0.000 description 14
- 238000000354 decomposition reaction Methods 0.000 description 9
- 239000007787 solid Substances 0.000 description 9
- 239000013078 crystal Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 3
- 230000001351 cycling effect Effects 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000000026 X-ray photoelectron spectrum Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000001157 Fourier transform infrared spectrum Methods 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 238000007210 heterogeneous catalysis Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/06—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron
- C01B21/0605—Binary compounds of nitrogen with carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/24—Nitrogen compounds
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/04—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by decomposition of inorganic compounds, e.g. ammonia
- C01B3/042—Decomposition of water
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
- C01P2002/82—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by IR- or Raman-data
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- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
- C01P2002/85—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by XPS, EDX or EDAX data
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- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/20—Particle morphology extending in two dimensions, e.g. plate-like
- C01P2004/24—Nanoplates, i.e. plate-like particles with a thickness from 1-100 nanometer
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Abstract
The invention discloses a polytriazinyl crystalline phase carbon nitride nano-sheet, a preparation method thereof and application thereof in hydrogen production by photocatalytic water splitting. The method is characterized in that dicyandiamide, sodium chloride, potassium chloride and lithium chloride are used as raw materials, and the polytriazinyl crystalline phase carbon nitride nano-sheet is prepared by a molten salt method. The method has the advantages of simple operation, mild reaction conditions, high repeatability, easy synthesis and certain industrial application prospect. The obtained poly-triazinyl crystalline phase carbon nitride nanosheets are used as catalysts, pure water can be decomposed into hydrogen and oxygen, separation and migration of photo-generated carriers can be promoted, and the utilization efficiency of the photo-generated carriers is improved, so that the reaction efficiency is improved, and the poly-triazinyl crystalline phase carbon nitride nanosheets have potential application prospects.
Description
Technical Field
The invention belongs to the field of heterogeneous catalysis and photocatalytic water decomposition, and particularly relates to a polytriazinyl crystalline phase carbon nitride nanosheet catalytic material, a preparation method thereof and application thereof in photocatalytic water decomposition hydrogen production.
Background
The photocatalytic water splitting hydrogen production is an environment-friendly and mild method for preparing hydrogen. The photocatalytic water splitting hydrogen producing technology is one process of splitting water into hydrogen and oxygen with catalyst in the presence of light and water. The technical point is whether the electrons and the holes generated by the catalyst after light excitation can be effectively separated and utilized, so that energy and electron transfer can be carried out. Therefore, the improvement of the utilization efficiency of the photo-generated carriers is a key to the improvement of the conversion efficiency of solar energy into hydrogen energy.
Disclosure of Invention
In order to solve the problems, the invention provides a preparation method and application of a polytriazinyl crystalline phase carbon nitride nano-sheet, which are characterized in that the crystalline phase carbon nitride nano-sheet has high photo-generated carrier separation efficiency and short migration distance, and the polytriazinyl crystalline phase carbon nitride nano-sheet is designed and synthesized and used as a catalyst to be applied to photocatalytic total decomposition water so as to promote the separation and migration of photo-generated carriers and improve the utilization efficiency of the photo-generated carriers, thereby improving the catalytic reaction efficiency.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a polytriazinyl crystalline phase carbon nitride nanosheet, prepared by the steps of:
1) Mixing dicyandiamide, sodium chloride, potassium chloride and lithium chloride in proportion, and performing heat treatment to obtain polymer carbon nitride mixed with molten salt;
2) Performing secondary heat treatment on the obtained polymer carbon nitride in a vacuum state to obtain a polytriazinyl crystalline phase carbon nitride nano-sheet mixed with molten salt;
3) Dispersing the obtained poly-triazinyl crystalline phase carbon nitride nano-sheets in pure water, filtering and washing the mixture by the pure water until the ionic strength of an eluate is 0, and drying the mixture at 60 ℃ overnight to obtain white powder of the poly-triazinyl crystalline phase carbon nitride nano-sheets.
Further, the mass ratio of the dicyandiamide to the sodium chloride to the potassium chloride to the lithium chloride in the step (1) is 1:3:6:1-1:5:4:1.
Further, the temperature of the heat treatment in the step (1) is 300-400 ℃, the time is 2-6 h, and the heating rate is 60-120 ℃/h.
Further, the temperature of the heat treatment in the step (2) is 500-600 ℃ and the time is 4-48 h.
The poly-triazinyl crystalline phase carbon nitride nano-sheet can be used for preparing hydrogen by photocatalytic decomposition of water, and specifically, the poly-triazinyl crystalline phase carbon nitride nano-sheet is used as a catalyst to decompose pure water into hydrogen and oxygen under the condition that pure water is used as a reactant. The invention provides a cheap, stable, efficient and environment-friendly carbon-nitrogen based polymer catalyst application method, and has potential application prospect.
Compared with the prior art, the invention has the following advantages:
(1) According to the invention, the polymer carbon nitride has a proper full-water decomposition energy band structure, the poly-triazinyl crystalline phase carbon nitride nanosheet catalyst is designed and synthesized, and is introduced into a reaction of photocatalytic water decomposition, so that the characteristics of high separation efficiency and short migration distance of crystalline phase carbon nitride nanosheets can be utilized, the light absorption capacity of the catalyst is improved, the separation and migration of the photo-generated carriers are further promoted, the utilization efficiency of the photo-generated carriers is improved, and the catalytic reaction efficiency is further improved.
(2) The catalyst of the invention has simple manufacturing process, low cost and strong stability. The catalytic reaction condition is mild, green and environment-friendly, and is beneficial to large-scale industrial production and application and ensures energy safety.
Drawings
Fig. 1 is a scanning electron microscope image of PTI nanoplatelets prepared in example 1.
Fig. 2 is an XRD pattern of PTI nanoplatelets prepared in example 1.
FIG. 3 is an X-ray photoelectron spectrum of N1 s of PTI nanoplatelets prepared in example 1.
Fig. 4 is a fourier transform infrared spectrum of PTI nanoplatelets prepared in example 1.
Fig. 5 is a scanning electron microscope image of the PTI phase of the comparative example.
Fig. 6 is a graph comparing photocatalytic water splitting activity of PTI nanoplatelets prepared in examples 1-3.
Fig. 7 is a graph showing comparison of photocatalytic water splitting activity of PTI nanoplatelets prepared in example 1 and bulk PTI prepared in comparative example.
Fig. 8 is a graph of catalytic effect of PTI nanoplatelets prepared in example 1 after 8h of cycling.
Detailed Description
A polytriazinyl crystalline phase carbon nitride nanosheet, prepared by the steps of:
1) Mixing dicyandiamide, sodium chloride, potassium chloride and lithium chloride according to a mass ratio of 1:3:6:1-1:5:4:1, placing the mixture into an ampoule, and performing heat treatment at 300-400 ℃ for 2-6 h to obtain polymer carbon nitride mixed with molten salt;
2) Vacuumizing and sealing an ampoule filled with polymer carbon nitride mixed with molten salt, and then performing heat treatment at 500-600 ℃ for 4-48 h to obtain a polytriazinyl crystal phase carbon nitride nano-sheet mixed with molten salt;
3) Dispersing the obtained polytriazinyl crystalline phase carbon nitride nano-sheets mixed with molten salt in pure water, filtering and washing the pure water until the ionic strength of an eluate is 0, and drying the pure water at 60 ℃ overnight to obtain white powder of the polytriazinyl crystalline phase carbon nitride nano-sheets.
In order to make the contents of the present invention more easily understood, the technical scheme of the present invention will be further described with reference to the specific embodiments, but the present invention is not limited thereto.
Example 1
Dicyandiamide, sodium chloride, potassium chloride and lithium chloride are placed in an ampoule (110 mL) in a mass ratio of 1:5:4:1, and heated by a furnace at 400 ℃ for 6 hours (ramp rate of 60 ℃/h) to obtain a mixture of solid powder polymer and molten salt. And vacuumizing and sealing the ampoule filled with the mixture, and heating for 24 hours by using a melting furnace at 550 ℃ (the ramp rate is 120 ℃/h) to obtain the mixture of the solid powder poly-triazinyl crystalline phase carbon nitride nano-sheet and the molten salt. And then opening the ampoule, taking out the mixture, dispersing the mixture in pure water, filtering and washing until the ionic strength of an eluate is 0, and then drying the eluate in vacuum at 60 ℃ overnight to obtain a white powder product, namely the polytriazinyl crystal phase carbon nitride (PTI) nanosheets.
Fig. 1 is a scanning electron microscope image of PTI nanoplatelets prepared in this example. The graph proves that the crystal phase is in the shape of a nano sheet. This is because the ternary molten salt LiCl/NaCl/KCl used in the invention has a higher melting point (633 ℃) and a lower LiCl content, and can provide fewer nucleation sites and more solid molten salt growth templates for the carbon nitride crystal, so that the crystal tends to grow along a two-dimensional plane to form larger nano-platelet crystals.
Fig. 2 is an XRD pattern of PTI nanoplatelets prepared in this example. The presence of the polytriazinyl crystalline phase structure is demonstrated by the figure.
Fig. 3 is an X-ray photoelectron spectrum of N1 s of PTI nanoplatelets prepared in this example. In the N1 s spectrum, the three characteristic peaks at 398.7, 399.8 and 401.2 eV are attributed to c=n-C, N- (C) 3 and C-N-H bonds, respectively, further demonstrating the triazinyl carbon nitride structure.
Fig. 4 is a fourier infrared spectrum of the PTI nanoplatelets prepared in this example. As can be seen, the strong peak of the sample at 808 cm −1 can be attributed to shock absorption by the triazacyclic unit, while the peak in the region of 1200-1600cm -1 can be attributed to stretching and stretching vibration of the CN ring.
Example 2
Dicyandiamide, sodium chloride, potassium chloride and lithium chloride are placed in an ampoule (110 mL) in a mass ratio of 1:4:5:1, and heated by a furnace at 400 ℃ for 6 hours (ramp rate of 60 ℃/h) to obtain a mixture of solid powder polymer and molten salt. And vacuumizing and sealing the ampoule filled with the mixture, and heating for 24 hours by using a melting furnace at 550 ℃ (the ramp rate is 120 ℃/h) to obtain the mixture of the solid powder poly-triazinyl crystalline phase carbon nitride nano-sheet and the molten salt. And then opening the ampoule, taking out the mixture, dispersing the mixture in pure water, filtering and washing until the ionic strength of an eluate is 0, and then drying the eluate in vacuum at 60 ℃ overnight to obtain a white powder product, namely the polytriazinyl crystal phase carbon nitride (PTI) nanosheets.
Example 3
Dicyandiamide, sodium chloride, potassium chloride and lithium chloride are placed in an ampoule (110 mL) in a mass ratio of 1:3:6:1, and heated by a furnace at 400 ℃ for 6 hours (ramp rate 120 ℃/h) to obtain a mixture of solid powder polymer and molten salt. And vacuumizing and sealing the ampoule filled with the mixture, and heating for 24 hours by using a melting furnace at 550 ℃ (the ramp rate is 120 ℃/h) to obtain the mixture of the solid powder poly-triazinyl crystalline phase carbon nitride nano-sheet and the molten salt. And then opening the ampoule, taking out the mixture, dispersing the mixture in pure water, filtering and washing until the ionic strength of an eluate is 0, and then drying the eluate in vacuum at 60 ℃ overnight to obtain a white powder product, namely the polytriazinyl crystal phase carbon nitride (PTI) nanosheets.
Comparative example
The dicyandiamide, potassium chloride and lithium chloride are placed in an ampoule (110 mL) in a mass ratio of 1:5.5:4.5, and heated by a furnace at 400 ℃ for 6 hours (ramp rate of 60 ℃/h) to obtain a mixture of solid powder polymer and molten salt. The ampoule containing the mixture was evacuated and closed and heated with a furnace at 550 ℃ for 24 hours (ramp rate 120 ℃/h) to obtain a mixture of solid powder polytriazinyl crystalline phase carbon nitride and molten salt. Then the ampoule is opened, the mixture is taken out and dispersed in pure water, filtered and washed until the ionic strength of the eluate is 0, and then vacuum-dried overnight at 60 ℃ to obtain white powder product, namely bulk phase polytriazinyl crystalline phase carbon nitride (PTI).
Full decomposition water activity experiment:
The specific operation steps are as follows: weighing 100 mg poly triazinyl crystalline phase carbon nitride nano-sheets, adding into 100mL water, and pouring into a reactor after ultrasonic mixing uniformly. After the air in the system is thoroughly discharged by utilizing a vacuum system, the reaction temperature is kept at 12 ℃, and a xenon lamp is started for reaction. After the reaction was completed, the amount of hydrogen produced was analyzed by gas chromatography (Shimadzu GC-8A) by sample injection. Meanwhile, the polytriazinyl crystalline phase carbon nitride nano-sheet prepared by the comparative example is used as a comparative example.
Fig. 6 is a graph comparing photocatalytic total-decomposition water activity of PTI nanoplatelets prepared in examples 1-3. From the figure, it can be seen that the photocatalytic activity of the PTI nanoplatelets prepared in example 1 is evident from the other examples.
Fig. 7 is a graph showing comparison of photocatalytic total-decomposition water activity of PTI nanoplatelets prepared in example 1 and bulk PTI prepared in comparative example 1. As can be seen, the PTI nanoplatelets have significantly improved activity compared to bulk carbon nitride.
Fig. 8 is a graph of catalytic effect of PTI nanoplatelets prepared in example 1 after 8h of cycling. As can be seen, PTI nanoplatelets exhibit higher cycling stability.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. The preparation method of the polytriazinyl crystalline phase carbon nitride nanosheets is characterized by comprising the following steps of:
1) Mixing dicyandiamide, sodium chloride, potassium chloride and lithium chloride in proportion, and performing heat treatment to obtain polymer carbon nitride mixed with molten salt;
2) Performing secondary heat treatment on the obtained polymer carbon nitride in a vacuum state to obtain a polytriazinyl crystalline phase carbon nitride nano-sheet mixed with molten salt;
3) Dispersing the obtained poly-triazinyl crystalline phase carbon nitride nano-sheets in pure water, filtering and washing the mixture by the pure water until the ionic strength of an eluate is 0, and drying the mixture at 60 ℃ overnight to obtain white powder of the poly-triazinyl crystalline phase carbon nitride nano-sheets.
2. The method of manufacturing according to claim 1, characterized in that: the mass ratio of the dicyandiamide to the sodium chloride to the potassium chloride to the lithium chloride used in the step (1) is 1:3:6:1-1:5:4:1.
3. The method of manufacturing according to claim 1, characterized in that: the temperature of the heat treatment in the step (1) is 300-400 ℃ and the time is 2-6 h.
4. The method of manufacturing according to claim 1, characterized in that: the temperature of the heat treatment in the step (2) is 500-600 ℃ and the time is 4-48 h.
5. A polytriazinyl crystalline phase carbon nitride nanoplatelet prepared by the method of any one of claims 1-4.
6. Use of the polytriazinyl crystalline phase carbon nitride nano-sheet according to claim 5 in hydrogen production by photocatalytic water splitting.
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| CN202311716551.3A CN118062813A (en) | 2023-12-14 | 2023-12-14 | Preparation method and application of polytriazinyl crystalline phase carbon nitride nanosheets |
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