CN110745869A - FeS nano-particles synthesized based on solvothermal method, preparation method and application - Google Patents
FeS nano-particles synthesized based on solvothermal method, preparation method and application Download PDFInfo
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- 239000002105 nanoparticle Substances 0.000 title claims abstract description 43
- 238000004729 solvothermal method Methods 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 44
- 238000006243 chemical reaction Methods 0.000 claims abstract description 32
- 239000000203 mixture Substances 0.000 claims abstract description 31
- 239000002244 precipitate Substances 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 23
- 229910052742 iron Inorganic materials 0.000 claims abstract description 22
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000005406 washing Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000003960 organic solvent Substances 0.000 claims abstract description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 10
- 239000010935 stainless steel Substances 0.000 claims abstract description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 7
- 150000002576 ketones Chemical class 0.000 claims abstract description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims description 10
- 239000001257 hydrogen Substances 0.000 claims description 10
- 239000000047 product Substances 0.000 claims description 10
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- 239000007795 chemical reaction product Substances 0.000 claims description 3
- 239000000376 reactant Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000006555 catalytic reaction Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000002904 solvent Substances 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 239000002159 nanocrystal Substances 0.000 abstract description 2
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- 239000011651 chromium Substances 0.000 description 5
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical class [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 4
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- 230000005290 antiferromagnetic effect Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000005291 magnetic effect Effects 0.000 description 3
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- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000011943 nanocatalyst Substances 0.000 description 2
- LQNUZADURLCDLV-UHFFFAOYSA-N nitrobenzene Chemical compound [O-][N+](=O)C1=CC=CC=C1 LQNUZADURLCDLV-UHFFFAOYSA-N 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
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- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 150000004770 chalcogenides Chemical class 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
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- 239000007772 electrode material Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
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- 229910001448 ferrous ion Inorganic materials 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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- 230000008092 positive effect Effects 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- -1 sulfide ions Chemical class 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
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- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
- B01J27/04—Sulfides
- B01J27/043—Sulfides with iron group metals or platinum group metals
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Abstract
The invention belongs to the technical field of electrocatalytic water decomposition, and discloses FeS nano-particles synthesized based on a solvothermal method, a preparation method and application thereof, wherein sulfur powder is added into iron pentacarbonyl, an organic solvent is added to dissolve and mix the sulfur powder and the iron pentacarbonyl, and the mixture is stirred at room temperature; transferring the mixture into a stainless steel high-pressure reaction kettle, putting the reaction kettle into an oven, preserving the temperature for a period of time, and cooling; after the reaction kettle is cooled to room temperature, centrifugally washing the mixture to obtain black precipitate, ultrasonically treating the black precipitate, washing the black precipitate for several times by using alcohol and ketone, and finally centrifugally collecting the black precipitate to obtain the nano particles. The invention takes an organic solvent as a solvent, adjusts the proportion of raw materials by a chemical method, prepares FeS nanocrystals with adjustable appearance and size, good conductivity and higher electrocatalytic performance on a nanoscale, and plays a wider role in emerging fields such as energy sanitation, ecological civilization field and the like.
Description
Technical Field
The invention belongs to the technical field of electrocatalytic water decomposition, and particularly relates to FeS nano particles synthesized based on a solvothermal method, a preparation method and application.
Background
Currently, the closest prior art: fossil fuels have been the main energy source of development in various countries for centuries. Nowadays, with the rapid development of industry, the continuous increase of energy consumption also leads to the increasing damage to the environment, and the urgent need is to develop new renewable clean energy substances to overcome the limitation and unfriendliness of the traditional fossil fuels to the environment. With the continuous progress of science and technology, the research on renewable and clean energy conversion technology has been a focus of people's pursuit in the past decades. Hydrogen energy is a renewable energy source, and has the advantages of cleanness, greenness, high combustion heat value and the like, and under the condition, water is electrochemically decomposed, so that the hydrogen is paid much attention to the application of the hydrogen in hydrogen production. Nowadays, more and more research is focused on the selection and preparation of the hydrogen production catalyst by electrochemically decomposing water, so as to find a suitable electrocatalyst which is widely applied to the electrochemical field. FeS has a scaly structure similar to molybdenum disulfide or graphite, has low hardness, and is an antiferromagnetic semiconductor material. The artificially synthesized FeS nano particles have large specific surface area, small particle size, high purity and very excellent performance in catalyzing water decomposition. Iron sulfides composed of iron and sulfur in nature are mainly pyrrhotite, pyrite, and the like. In general, iron-sulfur compounds possess unique electrochemical properties that are closely related to the crystal structure between iron and sulfur. Among these important inorganic materials, iron sulfide is widely used in the fields of photovoltaic solar cells, lithium ion battery electrode materials, and the like, due to its unique photoelectric properties. Various advantages make it widely used in practical process.
In recent years, due to the continuous progress of scientific research work, research on FeS has made great progress; the layered structure of the synthetic FeS and the natural sulfur iron compound can be subjected to plastic deformation along the friction direction, and is commonly used as a solid lubricant to improve the mechanical efficiency of machine parts: the FeS is used for treating the wastewater containing Cr (VI), which is a new treatment method proposed in recent years, and can reduce the toxic Cr (VI) into low-toxic Cr (III), the method has the advantages of high reaction speed, no need of adding a precipitator in the treatment process, capability of inhibiting the reduced trivalent chromium from being oxidized again, simplicity, convenience, high efficiency, wide reducing agent source, lower price and the like; pyrite (FeS) doped with cobalt2) The nano catalyst can catalyze and decompose water to produce hydrogen under an acidic condition, and shows that the electrochemical hydrogen evolution catalyst with low cost and high efficiency can be produced by expansion.
In summary, the problems of the prior art are as follows:
(1) the preparation process of pyrrhotite FeS is complicated and the process is complex.
(2) The FeS nano-catalyst is not reported to be used for catalyzing the reaction of decomposing water.
(3) The size, the morphology and other factors of the FeS nano material can have certain influence on the water decomposition performance of the catalyst.
The difficulty of solving the technical problems is as follows: the traditional method for preparing pyrrhotite needs a surfactant to assist glycol solvothermal reaction, and has large dependence on the surfactant and the solvent.
The significance of solving the technical problems is as follows: studies have also found that the product morphology depends on the type of solvent and the amount of sulfur used. The method used in the research makes it possible to synthesize uniform pyrite crystals, and has guiding significance for the preparation of other metal chalcogenides.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides FeS nano-particles synthesized based on a solvothermal method, a preparation method and application.
The invention is realized by a preparation method of FeS nano-particles synthesized based on a solvothermal method, which comprises the following steps: adding sulfur powder into iron pentacarbonyl, adding an organic solvent to dissolve and mix the sulfur powder and the iron pentacarbonyl, and stirring the mixture at room temperature; transferring the mixture into a stainless steel high-pressure reaction kettle, putting the reaction kettle into an oven, preserving the temperature for a period of time, and cooling; after the reaction kettle is cooled to room temperature, centrifugally washing the mixture to obtain black precipitate, ultrasonically treating the black precipitate, washing the black precipitate for several times by using alcohol and ketone, and finally centrifugally collecting the black precipitate to obtain the nano particles.
Further, the preparation method of the FeS nano-particles based on solvothermal synthesis comprises the following steps:
step one, 1ml to 5ml of iron pentacarbonyl is dropwise added into 1g to 10g of sulfur powder, and then 35ml of organic solvent is added to dissolve and mix the iron pentacarbonyl;
and secondly, transferring the mixture into a stainless steel high-pressure reaction kettle, transferring the high-pressure reaction kettle into an oven, adjusting the temperature to 100-250 ℃, and keeping the temperature for 10-24 hours.
And thirdly, after the high-pressure reaction kettle is cooled to room temperature, centrifuging the obtained mixture to obtain black precipitate, performing ultrasonic treatment on the black precipitate, washing the black precipitate for a plurality of times by using alcohol and ketone, finally performing centrifugal treatment, and collecting a reaction product to obtain the FeS product.
Further, in the first-step reactant proportion mixing, the mixing proportion of the volume of the iron pentacarbonyl, the volume of the organic solvent and the mass of the sulfur powder is x, y and z respectively, wherein x is more than or equal to 0 and less than or equal to 10; y is more than or equal to 10 and less than or equal to 50; z is more than or equal to 0 and less than or equal to 5.
Further, in the third centrifugal collection process, the centrifugal rotation speed is 12000 r/min, and the centrifugal time is 10 minutes.
Further, in the third step of the treatment process, the product is subjected to vacuum freeze-drying.
Another object of the present invention is to provide FeS nanoparticles prepared by the preparation method of FeS nanoparticles synthesized based on the solvothermal method, which have a scaly structure, belong to a hexagonal system, have a high melting point, and have low hardness. Belongs to an antiferromagnetic semiconductor material, has good reducibility, and is widely applied to industry as a solid lubricant, an electrode, a pollutant remover and the like.
The invention also aims to provide an application of the FeS nano-particles in catalysis of electrochemical decomposition of water to produce hydrogen.
Another object of the present invention is to provide a solid lubricant prepared from the FeS nanoparticles.
Another object of the present invention is to provide an electrode prepared from the FeS nanoparticles.
Another object of the present invention is to provide a pollutant removing agent prepared from the FeS nanoparticles.
In summary, the advantages and positive effects of the invention are: the invention takes an organic solvent as a solvent, adjusts the proportion of raw materials by a chemical method, prepares FeS nanocrystals with adjustable appearance and size, good conductivity and higher electrocatalytic performance on a nanoscale, and plays a wider role in the emerging field, for example, FeS contains ferrous ions and sulfide ions, has good reducibility and has good removal effect on organic pollutants such as nitrobenzene and the like and heavy metal pollutants such as mercury, chromium and the like. Can be applied to the fields of environmental management, ecological civilization and the like.
Compared with the prior art, the method has the advantages that the proportion of the raw materials is adjusted by a chemical method, the FeS crystal with adjustable appearance and size, good conductivity and higher electrocatalytic performance is prepared on a nanoscale, the contact area with water molecules is increased by the loose and porous lamellar structure, and the capability of catalyzing water decomposition is greatly improved. Is expected to play a wider role in the field of new energy; the method has the advantages of simple operation, cheap and easily-obtained raw materials, capability of obtaining FeS with good appearance, ductility and dispersibility, and finally good catalyst with good hydrogen performance for electrochemically decomposing water.
Drawings
Fig. 1 is a flow chart of a preparation method of FeS nanoparticles synthesized based on a solvothermal method according to an embodiment of the present invention.
Fig. 2 is an X-ray diffraction pattern of FeS nanoparticles prepared in example 1 and example 2 provided by the present invention.
FIG. 3 is an SEM image of the flower-cluster-shaped FeS nanoparticles prepared in example 1 provided by the invention.
FIG. 4 is a graph of catalytic water splitting performance of the flower-shaped FeS nanoparticles prepared in example 1 and example 2 provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems in the prior art, the invention provides FeS nanoparticles synthesized based on a solvothermal method, a preparation method and application thereof, and the invention is described in detail below with reference to the accompanying drawings.
The FeS nano-particles synthesized based on the solvothermal method provided by the embodiment of the invention have a scaly structure, belong to a hexagonal system, and have high melting point and low hardness. Belongs to an antiferromagnetic semiconductor material, has good reducibility, and is widely applied to industry as a solid lubricant, an electrode, a pollutant remover and the like.
As shown in fig. 1, a method for preparing FeS nanoparticles synthesized based on a solvothermal method according to an embodiment of the present invention includes the following steps:
s101: adding sulfur powder into iron pentacarbonyl, adding an organic solvent to dissolve and mix the sulfur powder and the iron pentacarbonyl, and stirring the mixture at room temperature;
s102: transferring the mixture into a stainless steel high-pressure reaction kettle, putting the reaction kettle into an oven, preserving the temperature for a period of time, and cooling;
s103: after the reaction kettle is cooled to room temperature, centrifugally washing the mixture to obtain black precipitate, ultrasonically treating the black precipitate, washing the black precipitate for several times by using alcohol and ketone, and finally centrifugally collecting the black precipitate to obtain the nano particles.
The preparation method of the FeS nano-particles synthesized based on the solvothermal method provided by the embodiment of the invention specifically comprises the following steps:
step one, 1ml to 5ml of iron pentacarbonyl is dropwise added into 1g to 10g of sulfur powder, and then 35ml of organic solvent is added to dissolve and mix the iron pentacarbonyl;
and secondly, transferring the mixture into a stainless steel high-pressure reaction kettle, transferring the high-pressure reaction kettle into an oven, adjusting the temperature to 100-250 ℃, and keeping the temperature for 10-24 hours.
And thirdly, after the high-pressure reaction kettle is cooled to room temperature, centrifuging the obtained mixture to obtain black precipitate, performing ultrasonic treatment on the black precipitate, washing the black precipitate for a plurality of times by using alcohol and ketone, finally performing centrifugal treatment, and collecting a reaction product to obtain the FeS product.
In the preferred embodiment of the invention, in the first step of mixing the reactants, the mixing ratio of the volume of the iron pentacarbonyl, the volume of the organic solvent and the mass of the sulfur powder is x: y: z, wherein x is more than or equal to 0 and less than or equal to 10; y is more than or equal to 10 and less than or equal to 50; z is more than or equal to 0 and less than or equal to 5.
In the preferred embodiment of the present invention, in the third centrifugal collection process, the centrifugal speed is 12000 r/min, and the centrifugal time is 10 minutes.
In a preferred embodiment of the present invention, during the third step of the process, the product is subjected to vacuum freeze-drying.
The technical solution of the present invention is further described with reference to the following specific examples.
Example 1:
the preparation method of the FeS nano-particles synthesized based on the solvothermal method provided by the embodiment of the invention specifically comprises the following steps:
firstly, 1.5ml of iron pentacarbonyl is dropwise added into 1g of sulfur powder, then 35ml of p-xylene is added, the mixture is stirred at room temperature for 15 minutes by magnetic force at the rotating speed of 1200 r/min, then the mixture is transferred into a stainless steel high-pressure reaction kettle, and then the high-pressure reaction kettle is placed into an oven at the temperature of 210 ℃ and is kept for 24 hours. And cooling the high-pressure reaction kettle to room temperature, carrying out centrifugal washing to obtain a black precipitate, carrying out ultrasonic treatment and washing on isopropanol and acetone for several times, finally centrifuging at the rotating speed of 12000 r/min for 10 minutes, and collecting a product to obtain the FeS. FIG. 1 shows SEM images of the flower-shaped FeS nanoparticles prepared in example 1 of the present invention; FIG. 2 is an X-ray diffraction pattern of the flower-cluster-shaped FeS nanoparticles prepared in example 1 of the present invention.
Example 2:
the preparation method of the FeS nano-particles synthesized based on the solvothermal method provided by the embodiment of the invention specifically comprises the following steps:
firstly, 1.5ml of iron pentacarbonyl is dropwise added into 1.5g of sulfur powder, then 35ml of p-xylene is added, the mixture is stirred for 15 minutes at room temperature by magnetic force at the rotating speed of 1200 rpm, then the mixture is transferred into a stainless steel high-pressure reaction kettle, and then the high-pressure reaction kettle is placed into an oven at the temperature of 210 ℃ and is kept for 24 hours. And cooling the high-pressure reaction kettle to room temperature, carrying out centrifugal washing to obtain a black precipitate, carrying out ultrasonic treatment and washing on isopropanol and acetone for several times, finally centrifuging at the rotating speed of 12000 r/min for 10 minutes, and collecting a product to obtain the FeS.
Example 3:
the preparation method of the FeS nano-particles synthesized based on the solvothermal method provided by the embodiment of the invention specifically comprises the following steps:
firstly, 1.5ml of iron pentacarbonyl is dropwise added into 2g of sulfur powder, then 35ml of p-xylene is added, the mixture is stirred at room temperature for 15 minutes by magnetic force at the rotating speed of 1200 r/min, then the mixture is transferred into a stainless steel high-pressure reaction kettle, and then the high-pressure reaction kettle is placed into an oven at the temperature of 210 ℃ and is kept for 24 hours. And cooling the high-pressure reaction kettle to room temperature, centrifuging and washing to obtain a black precipitate, ultrasonically treating and washing with isopropyl acetone and acetone for several times, centrifuging at the rotating speed of 12000 r/min for 10 minutes, and collecting a product to obtain the FeS.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A preparation method of FeS nano-particles synthesized based on a solvothermal method is characterized by comprising the following steps: adding sulfur powder into iron pentacarbonyl, adding an organic solvent to dissolve and mix the sulfur powder and the iron pentacarbonyl, and stirring the mixture at room temperature; transferring the mixture into a stainless steel high-pressure reaction kettle, putting the reaction kettle into an oven, preserving the temperature for a period of time, and cooling; after the reaction kettle is cooled to room temperature, centrifugally washing the mixture to obtain black precipitate, ultrasonically treating the black precipitate, washing the black precipitate for several times by using alcohol and ketone, and finally centrifugally collecting the black precipitate to obtain the nano particles.
2. The method for preparing FeS nanoparticles based on solvothermal synthesis according to claim 1, wherein the method for preparing FeS nanoparticles based on solvothermal synthesis comprises the steps of:
step one, 1ml to 5ml of iron pentacarbonyl is dropwise added into 1g to 10g of sulfur powder, and then 35ml of organic solvent is added to dissolve and mix the iron pentacarbonyl;
secondly, transferring the mixture into a stainless steel high-pressure reaction kettle, transferring the high-pressure reaction kettle into an oven, adjusting the temperature to 100-250 ℃, and keeping the temperature for 10-24 hours;
and thirdly, after the high-pressure reaction kettle is cooled to room temperature, centrifuging the obtained mixture to obtain black precipitate, performing ultrasonic treatment on the black precipitate, washing the black precipitate for a plurality of times by using alcohol and ketone, finally performing centrifugal treatment, and collecting a reaction product to obtain the FeS product.
3. The preparation method of FeS nano-particles based on solvothermal synthesis according to claim 2, wherein in the first-step mixing of reactant proportions, the mixing proportions of the volume of iron pentacarbonyl, the volume of organic solvent and the mass of sulfur powder are x: y: z, wherein x is greater than or equal to 0 and less than or equal to 10; y is more than or equal to 10 and less than or equal to 50; z is more than or equal to 0 and less than or equal to 5.
4. The method for preparing FeS nanoparticles synthesized based on the solvothermal method according to claim 1, wherein in the third centrifugal collection process, the centrifugal rotation speed is 12000 rpm, and the centrifugal time is 10 minutes.
5. The method for preparing FeS nanoparticles synthesized based on the solvothermal method according to claim 1, wherein in the third step of the process, the product is lyophilized under vacuum.
6. FeS nanoparticles prepared by the preparation method of FeS nanoparticles based on solvothermal synthesis according to any one of claims 1 to 5.
7. Use of the FeS nanoparticles of claim 6 in catalysis of electrochemical decomposition of water to produce hydrogen.
8. A solid lubricant prepared from the FeS nanoparticles of claim 6.
9. An electrode prepared from the FeS nanoparticles of claim 6.
10. A pollutant remover prepared from the FeS nanoparticles of claim 6.
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