CN109939665B - Graphite oxide alkyne nanosheet for photolyzing water to produce oxygen under visible light and preparation method and application thereof - Google Patents
Graphite oxide alkyne nanosheet for photolyzing water to produce oxygen under visible light and preparation method and application thereof Download PDFInfo
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Abstract
The invention provides a preparation method of graphite oxide alkyne nanosheets by photolysis of water under visible light to produce oxygen, and the preparation method of graphite oxide alkyne nanosheets is simple, efficient and low in cost. The graphite oxide alkyne nanosheet prepared by the method has rich oxygen-containing functional groups on the surface, has excellent dispersibility in water and is beneficial to improving light absorption, has uniform size and ultrathin thickness, is beneficial to separation and transmission of photo-generated electrons and holes, and improves the performance of photolysis of water to generate oxygen under visible light. The graphite oxide alkyne nanosheet material prepared by the method has good absorption in a visible light range, and the energy band structure meets the requirement of catalyzing water to decompose to generate oxygen under the irradiation of visible light, so that the water is decomposed to generate oxygen by high-performance visible light. And the graphite alkyne oxide nanosheet material prepared by the method still shows excellent water photolysis oxygen generation performance under the irradiation of near infrared light (lambda is 660 nm).
Description
Technical Field
The invention belongs to the technical field of oxygen generation by photolysis of water, and particularly relates to a graphite oxide alkyne nanosheet for photolysis of water to generate oxygen under visible light and a preparation method thereof.
Background
Photocatalytic water splitting by utilizing a semiconductor catalyst is an efficient way for converting solar energy into chemical energy, the biggest obstacle for limiting photocatalytic water splitting at present is water oxidation half-reaction, and the generation of oxygen by water oxidation needs to transfer a plurality of electrons and has higher overpotential, so that the process is a kinetic hysteresis process. Therefore, the search for a novel visible photolysis aquatic oxygen generation catalyst with high efficiency and low price is always a hotspot and a key point in the research field.
The existing visible light water oxygen generation catalyst is mainly metal semiconductors such as silver phosphate, bismuth vanadate, iron oxide and the like, although the materials are deeply researched in the field of visible light water catalytic oxygen generation through water decomposition, due to the fact that band gaps of the materials are difficult to regulate, heterojunctions are usually required to be compositely constructed with other semiconductors to obtain good performance, and meanwhile, the semiconductors contain metals, so that the synthesis cost of the catalyst is increased, and the industrial application is not facilitated. The other is an organic semiconductor based on carbon nitride, which has low synthesis cost and controllable band gap, but has very low catalytic activity due to the kinetic lag of water oxidation, so that a co-catalyst such as ruthenium oxide, iridium oxide, cobaltosic oxide and the like is required to be added, and the industrial application is also not facilitated.
The graphathyridine is a compound of sp and sp2A novel two-dimensional organic semiconductor composed of hybridized carbon atoms is successfully applied to the relevant fields of photocatalysis due to good absorption of the novel two-dimensional organic semiconductor under visible light. Germany Advanced Energy Materials (8 th volume in 2018, page 1702992) reports that a carbon nitride material is grown on the surface of graphite alkyne to form a two-dimensional heterojunction, and the high hole transfer capacity of the graphite alkyne material is utilized to improve the hydrogen production rate. The preparation process of the composite catalyst is complex, and in order to improve the performance, platinum nanoparticles are deposited on the surface of the composite catalyst, which is not beneficial to large-scale application.
Therefore, the band gap structure of the graphdiyne is adjusted by modifying a functional group or changing the composition of a framework without using other co-catalysts or compounding a semiconductor and the graphdiyne, and the band gap structure is further applied to visible light water photolysis to generate oxygen, which is not researched currently.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a graphite alkyne nanosheet capable of photolyzing water and producing oxygen under visible light and a preparation method thereof, in the present invention, the graphite alkyne is modified with an oxygen-containing functional group by oxidation and is subjected to liquid phase ultrasonic exfoliation to change the thickness thereof, the band gap of the graphite alkyne is adjusted together, the adjustment of the energy band structure of the graphite alkyne is realized under the condition that no other metal or semiconductor is introduced, and the performance of photolyzing water and producing oxygen under visible light is improved.
The invention provides a preparation method of a graphite oxide alkyne nanosheet capable of photolyzing water to generate oxygen under visible light, which comprises the following steps:
A) oxidizing the graphite alkyne by using mixed strong acid to obtain oxidized graphite alkyne;
B) and stripping the graphite oxide alkyne by liquid-phase ultrasonic stripping, and performing centrifugal separation to obtain the graphite oxide alkyne nanosheet.
Preferably, the mixed strong acid is selected from mixed acid of concentrated sulfuric acid and concentrated nitric acid, and the volume ratio of the concentrated sulfuric acid to the concentrated nitric acid is 1: 2-2: 5.
Preferably, step a) is specifically:
adding the graphdiyne into the strong mixed acid at the temperature of 0 ℃ to obtain a mixture;
and carrying out oxidation reaction on the mixture at the temperature of 25 +/-5 ℃ to obtain the graphite oxide alkyne.
Preferably, the mass volume ratio of the graphdiyne to the mixed strong acid is 50mg:15 ml-60 mg:15 ml.
Preferably, the liquid phase dispersion liquid adopted by the liquid phase ultrasonic stripping is a mixed liquid of deionized water and concentrated hydrochloric acid, and the volume ratio of the deionized water to the concentrated hydrochloric acid is 40ml:0.05 ml-40 ml:0.06 ml.
Preferably, the mass-to-volume ratio of the graphite alkyne oxide to the liquid-phase dispersion liquid is 10mg:40.05ml to 15mg:40.05 ml.
Preferably, the temperature of the ultrasonic treatment is 5-20 ℃; the ultrasonic power of ultrasonic treatment is 100-200W; the ultrasonic frequency of ultrasonic treatment is 20-60 KHz; the ultrasonic treatment time is 20-30 h.
Preferably, the centrifugal separation conditions are as follows: centrifuging the dispersion liquid stripped from the oxidized graphite alkyne at the rotating speed of 3000 +/-100 rpm for 5 +/-0.5 minutes, and removing precipitates to obtain an upper-layer dispersion liquid;
and centrifuging the upper-layer dispersion liquid for 10 +/-1 minutes at the rotating speed of 8000 +/-500 rpm, and collecting precipitates to obtain the graphite oxide alkyne nanosheet.
The invention also provides the graphite oxide alkyne nanosheet prepared by the preparation method and used for photolyzing water to generate oxygen under visible light, wherein the thickness of the graphite oxide alkyne nanosheet is 1.7 +/-0.1 nm, and the size of a graphite oxide alkyne nanosheet layer is 120 +/-10 nm.
The invention also provides an application of the graphite oxide alkyne nanosheet in photolysis of water under visible light to generate oxygen.
Compared with the prior art, the invention provides a preparation method of a graphite oxide alkyne nanosheet for photolyzing water to generate oxygen under visible light, which comprises the following steps: A) oxidizing the graphite alkyne by using mixed strong acid to obtain oxidized graphite alkyne; B) and stripping the graphite oxide alkyne by liquid-phase ultrasonic stripping, and performing centrifugal separation to obtain the graphite oxide alkyne nanosheet. According to the invention, the graphite alkyne is subjected to oxygen-containing functional group modification through oxidation and liquid-phase ultrasonic stripping to change the thickness of the graphite alkyne, the band gap of the graphite alkyne is adjusted together, and the adjustment of the energy band structure of the graphite alkyne is realized under the condition that no other metal or semiconductor is introduced. The method for preparing the graphite oxide alkyne nanosheet is simple, efficient and low in cost. The graphite oxide alkyne nanosheet prepared by the method has rich oxygen-containing functional groups on the surface, has excellent dispersibility in water and is beneficial to improving light absorption, has uniform size and ultrathin thickness, is beneficial to separation and transmission of photo-generated electrons and holes, and improves the performance of photolysis of water to generate oxygen under visible light. The graphite oxide alkyne nanosheet material prepared by the method has good absorption in a visible light range, and the energy band structure meets the requirement of catalyzing water to decompose to generate oxygen under the irradiation of visible light, so that the water is decomposed to generate oxygen by high-performance visible light. And the graphite alkyne oxide nanosheet material prepared by the method still shows excellent water photolysis oxygen generation performance under the irradiation of near infrared light (lambda is 660 nm).
Drawings
Fig. 1 is a molecular structural formula of a graphite alkyne oxide nanosheet prepared in embodiments 1, 2 and 3 of the present invention and raman spectroscopy analysis of the graphite alkyne and graphite alkyne oxide nanosheet;
FIG. 2 is an X-ray photoelectron spectroscopy analysis of a graphdine and oxidized graphdine nanosheet prepared in examples 1, 2 and 3 of the present invention;
FIG. 3 is a transmission electron micrograph and a scanning electron micrograph of a graphdine prepared according to example 1 of the present invention;
fig. 4 is a transmission electron microscope image, an atomic force microscope image and a thickness image of the graphite oxide alkyne nanosheet prepared in examples 2 and 3 of the present invention;
FIG. 5 is a graph of the diffuse reflection of UV-visible near-IR light and the corresponding optical band gap of graphdine prepared in example 1 of the present invention;
fig. 6 is a graph of diffuse reflection of ultraviolet, visible and near infrared light and corresponding optical band gap of graphite oxide alkyne nanosheets prepared in embodiments 2 and 3 of the present invention;
fig. 7 is a graph of visible photolysis water-oxygen generation performance of graphite alkyne and graphite oxide alkyne nanosheets according to an application example of the present invention.
Detailed Description
The invention provides a preparation method of a graphite oxide alkyne nanosheet capable of photolyzing water to generate oxygen under visible light, which comprises the following steps:
A) oxidizing the graphite alkyne by using mixed strong acid to obtain oxidized graphite alkyne;
B) and stripping the graphite oxide alkyne by liquid-phase ultrasonic stripping, and performing centrifugal separation to obtain the graphite oxide alkyne nanosheet.
The preparation method of the oxidized graphite alkyne nanosheet takes graphite alkyne as a raw material, wherein the graphite alkyne is prepared according to the following method:
adding an acetone solution of hexaalkynyl benzene into a mixed solution of acetone, pyridine and tetramethylethylenediamine in which copper sheets are dispersed, and reacting under a heating condition by using nitrogen as a shielding gas to obtain the graphdiyne.
The concentration of the hexaalkynyl benzene in the acetone solution of the hexaalkynyl benzene is 0.8 mg/ml-1.0 mg/ml.
The volume ratio of the acetone solution of the hexaalkynyl benzene to the mixed solution is 45ml:106 ml-50 ml:106 ml.
The volume ratio of the acetone, the pyridine and the tetramethylethylenediamine is (100 +/-1): (5 +/-0.05): 1 +/-0.01).
The copper sheet is added into the mixed solution in an amount of (50 +/-5) mg and (106 +/-1) ml.
The reaction temperature was 50 ℃ and the reaction time was 24 hours.
And then, oxidizing the graphate with mixed strong acid to obtain oxidized graphate.
The mixed strong acid is selected from mixed acid of concentrated sulfuric acid and concentrated nitric acid, and the volume ratio of the concentrated sulfuric acid to the concentrated nitric acid is 1: 2-2: 5.
Specifically, the preparation method of the graphite oxide alkyne nanosheet comprises the following steps:
adding the graphdiyne into the strong mixed acid at the temperature of 0 ℃ to obtain a mixture, wherein the mass volume ratio of the graphdiyne to the strong mixed acid is 50mg:15 ml-60 mg:15 ml.
And carrying out an oxidation reaction on the mixture at the temperature of 25 +/-5 ℃, wherein the time of the oxidation reaction is 6-8 hours.
And diluting the reaction solution of the oxidation reaction with deionized water, washing with deionized water, and centrifuging to obtain the graphite oxide alkyne.
And then, stripping the graphite oxide alkyne by liquid-phase ultrasonic stripping, and performing centrifugal separation to obtain the graphite oxide alkyne nanosheet.
The liquid phase dispersion liquid adopted by the liquid phase ultrasonic stripping is a mixed liquid of deionized water and concentrated hydrochloric acid, and the volume ratio of the deionized water to the concentrated hydrochloric acid is 40ml:0.05 ml-40 ml:0.06 ml.
Specifically, graphite alkyne oxide is dispersed in a liquid-phase dispersion liquid, and then the dispersion liquid is placed in an ultrasonic machine for ultrasonic stripping. The mass volume ratio of the graphite oxide alkyne to the liquid phase dispersion liquid is 10mg:40.05 ml-15 mg:40.05 ml.
The temperature of ultrasonic treatment is 5-20 ℃, and preferably 10-15 ℃; the ultrasonic power of ultrasonic treatment is 100-200W, preferably 130-170W; the ultrasonic frequency of the ultrasonic treatment is 20-60 KHz, preferably 30-50 KHz; the ultrasonic treatment time is 20-30 h, preferably 24-28 h.
After ultrasonic exfoliation, the unpeeled feedstock was separated from the exfoliated graphite oxide alkyne nanoplatelets using centrifugation. The centrifugal separation conditions are as follows: and centrifuging the dispersion liquid after stripping the graphite oxide alkyne at the rotating speed of 3000 +/-100 rpm for 5 +/-0.5 minutes, and removing precipitates to obtain an upper-layer dispersion liquid.
And centrifuging the upper-layer dispersion liquid for 10 +/-1 minutes at the rotating speed of 8000 +/-500 rpm, and collecting precipitates to obtain the graphite oxide alkyne nanosheet.
The invention also provides the graphite oxide alkyne nanosheet prepared by the preparation method, the thickness of the graphite oxide alkyne nanosheet is uniform and is 1.7 +/-0.1 nm, and the size of the graphite oxide alkyne nanosheet layer is uniform and is 120 +/-10 nm.
The invention also provides an application of the graphite oxide alkyne nanosheet in photolysis of water under visible light to generate oxygen. The oxidized graphite alkyne nanosheet provided by the invention realizes the water and oxygen generation by visible light decomposition and the water and oxygen generation by near infrared light (lambda is 660 nm). The obtained material is successfully applied to high-performance water photolysis oxygen generation under visible light as an organic semiconductor photocatalyst, and the unit oxygen generation amount is up to 150.7 mu mol/g/h.
The graphite oxide alkyne nanosheet provided by the invention has uniform size and ultrathin thickness, is beneficial to separation and transmission of photoproduction electrons and holes, and further improves the performance of photolysis of water to generate oxygen under visible light; the graphite oxide alkyne nanosheet material prepared by the method has good absorption in a visible light range, and the energy band structure meets the requirement of catalyzing water to decompose to generate oxygen under the irradiation of visible light, so that the water is decomposed to generate oxygen by high-performance visible light.
The photolysis of water under visible light to produce oxygen is to disperse the prepared graphite oxide alkyne nanosheet in a solution of deionized water and an electronic sacrificial agent, transfer the solution into a transparent quartz container, introduce argon gas to remove air, seal the container with a rubber plug, irradiate the container with a light source with a wavelength of more than 420nm at room temperature, and detect and calculate the amount of generated oxygen by using gas chromatography.
Compared with the prior art, the invention has the following advantages:
1. the method for preparing the graphite oxide alkyne nanosheet is simple, efficient and low in cost;
2. modifying oxygen-containing functional groups of the graphyne through oxidation and ultrasonically stripping to change the thickness of the graphyne, adjusting the band gap of the graphyne together, and realizing the adjustment of the energy band structure of the graphyne under the condition of not introducing any other metal or semiconductor;
3. the prepared graphite oxide alkyne nanosheet has rich oxygen-containing functional groups on the surface, has excellent dispersibility in water and is beneficial to improving light absorption;
4. the prepared graphite oxide alkyne nanosheet has uniform size and ultrathin thickness, is beneficial to separation and transmission of photoproduction electrons and holes, and improves the performance of photolysis of water to generate oxygen under visible light;
5. the graphite oxide alkyne nanosheet material prepared by the method has good absorption in a visible light range, and the energy band structure meets the requirement of catalyzing water to decompose and generate oxygen under the irradiation of visible light, so that the water is decomposed to generate oxygen by high-performance visible light;
6. the graphite oxide alkyne nanosheet material prepared by the method still shows excellent performance of photolyzing water to generate oxygen under the irradiation of near infrared light (lambda is 660 nm).
For further understanding of the present invention, the oxidized graphite alkyne nanosheet for photolyzing water to generate oxygen under visible light and the preparation method and application thereof provided by the present invention are described below with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Example 1:
100 ml of acetone, 5ml of pyridine and 1 ml of tetramethylethylenediamine are mixed to prepare a solution, 50mg of a clean copper sheet is added, and then 50ml of a hexa-alkynylbenzene acetone solution with a concentration of 1 mg/ml is injected into the solution at a rate of 25 ml/h by using a syringe pump under the protection of nitrogen. The mixed system is reacted for 24 hours in an oil bath at 50 ℃ under the protection of nitrogen. And finally, fully washing the sample by using hot acetone, pyridine and N, N-dimethylformamide in sequence, and removing unreacted monomers and oligomers to obtain the graphdiyne sample.
Example 2:
5ml of concentrated sulfuric acid was mixed with 10 ml of concentrated nitric acid at 0 ℃ and then a 50mg sample of graphdiyne was slowly added to the mixture. The reaction was magnetically stirred at room temperature for 6 hours. Diluting the dispersion with 200 ml of deionized water, centrifuging to collect a sample, thoroughly washing with deionized water until the pH value of the separation solution is neutral, and vacuum-drying at room temperature to obtain a graphite oxide alkyne sample.
Example 3:
a10 mg sample of graphite oxide was dispersed in a mixed solution of 40ml of deionized water and 0.05ml of hydrochloric acid, and the dispersion was subjected to liquid phase ultrasonic exfoliation in an ultrasonic machine (ultrasonic power 150W, frequency 40 kHz), temperature was maintained below 10 ℃ and ultrasonic exfoliation was carried out for 24 hours. The dispersion was centrifuged at 3000rpm for 5 minutes to precipitate the unstripped and post-ripped aggregated samples. And finally, centrifuging the upper-layer dispersion liquid for 10 minutes at a rotating speed of 8000rpm to obtain the ultrathin graphite oxide alkyne nanosheet.
FIG. 1a is a molecular structural formula of a graphite oxide alkyne nanosheet prepared in examples 1, 2 and 3;
FIG. 1b is a Raman spectrum analysis of the graphyne prepared in examples 1, 2 and 3 and the graphyne nanosheet prepared from graphite and graphite oxide, wherein the graphyne is represented by GDY and the graphite oxide is represented by GDYO. After oxidation and exfoliation, the volume of graphyne was found to be 1920cm-1And 2178cm-1The characteristic peak is weakened, which indicates that the conjugated structure of the graphite oxide alkyne nanosheet is regulated;
FIG. 2a is an X-ray photoelectron spectroscopy analysis of the graphdine prepared in example 1, with sp hybridized carbon content of sp2Twice as much hybridized carbon, indicating that graphyne was successfully synthesized by example 1;
fig. 2b is an X-ray photoelectron spectroscopy analysis of the oxidized graphite alkyne nanosheets prepared in examples 2 and 3, in which the sp-hybridized carbon content is greatly reduced, which indicates that the conjugated structure of the graphite alkyne is adjusted, and the contents of C-O and C ═ O are significantly increased, which indicates that the graphite alkyne is successfully oxidized;
FIGS. 3a and b are the transmission electron microscope image and the scanning electron microscope image of the graphdine obtained in example 1, wherein the graphdine is seen to be stacked layer by layer to form a flower-shaped aggregate, because the layers have very strong conjugate interaction force;
fig. 4a and b are a transmission electron microscope image, an atomic force microscope image and a thickness image of the graphite oxide alkyne nanosheet obtained in examples 2 and 3, wherein the graphite oxide alkyne nanosheet has a size of 120 ± 10 nanometers and a thickness of 1.7 ± 0.1 nanometer;
FIGS. 5a and b are the ultraviolet-visible near-infrared diffuse reflectance and optical band gap diagrams of the graphdiyne obtained in example 1, which illustrate that the obtained sample has better absorption in the visible region; the optical band gap is 1.46 eV;
fig. 6a and b are ultraviolet-visible near-infrared light diffuse reflection diagrams and optical band gap diagrams of the oxidized graphite alkyne nanosheets obtained in examples 2 and 3, and illustrate that the obtained sample has good absorption in the visible light region; an optical band gap of 1.64eV indicates that the photocatalyst has an ability to be used as a visible-light photocatalyst with its band gap adjusted.
The application example is as follows: photolysis of aquatic oxygen under visible light
10mg of the prepared material was added to a sealable quartz bottle, and 50ml of deionized water and 84.9 mg of silver nitrate were further added, followed by ultrasonic dispersion treatment for 15 minutes. The solvent and the air in the container were purged by bubbling argon gas into the dispersion at a flow rate of 0.1 liter/min for 30 minutes, and then the container was sealed with a rubber stopper and a sealing film. And the container was placed under a light source having an intensity of 100 milliwatts per square centimeter, the light source being supplied by a xenon lamp, and a filter which allows only light having a wavelength of more than 420nm to pass therethrough was placed at the light source emission. The oxygen test temperature of the whole photolysis water is maintained at 25 +/-5 ℃.
And (3) extracting 1 ml of gas from the quartz bottle by using an injector every 1 hour, detecting and calculating the content of oxygen in the gas by using a gas chromatograph, multiplying the content by the total volume of the gas in the quartz bottle to obtain the total oxygen yield, and dividing the total oxygen yield by the used time and the mass of the used material to obtain the unit oxygen yield of the material.
If other conditions in this embodiment are not changed, the xenon lamp light source is changed to a laser light source with a wavelength of 660nm, and the performance of oxygen generation by water photolysis under the irradiation of the light source with the wavelength of 660nm can be tested.
Fig. 7 is a graph of the performance of photolysis of water to produce oxygen in different wavelength ranges of graphite alkyne nanosheet and graphite alkyne oxide in the example of the application. The unit oxygen generation rate of the graphite oxide alkyne nanosheet reaches 150.7 mu mol/g/h (lambda is more than 420nm) or 50.3 mu mol/g/h (lambda is 660 nm); the oxygen production rate per graphoyne reaches 4.8 mu mol/g/h (lambda is more than 420 nm).
Example 4
According to the preparation method of the embodiment 1-3, only the process of liquid phase ultrasonic stripping is changed, low-speed centrifugation (3000 +/-100 rpm, 5 +/-0.5 min) is not used for separating graphite oxide alkynes with different stripping degrees, the rotation speed of 8000 +/-500 rpm is directly used for centrifuging for 10 +/-1 min to obtain a mixed sample, the mixed sample is applied to visible light catalysis water decomposition to generate oxygen, and the unit oxygen generation rate reaches 78.2 mu mol/g/h, because the unit oxygen generation rate is reduced by part of non-stripped samples.
Example 5
According to the preparation method of the embodiment 1-3, only the technology of liquid-phase ultrasonic stripping is changed, the ultrasonic stripping time is shortened to 12 hours, the visible light catalysis unit oxygen production rate of the graphite oxide alkyne nanosheet obtained after centrifugal separation is 65.8 mu mol/g/h, and the thickness distribution of the graphite oxide alkyne nanosheet obtained through separation is thicker than that of a sample stripped for 24 hours due to the fact that the ultrasonic stripping time is shorter, and the unit oxygen production rate is reduced.
Example 6
According to the preparation method of the embodiment 1-3, only the technology of liquid-phase ultrasonic stripping is changed, the ultrasonic stripping time is prolonged to 36h, and the visible light catalysis unit oxygen production rate of the graphite oxide alkyne nanosheet obtained after centrifugal separation is 83.2 [ mu ] mol/g/h, because the ultrasonic stripping time is too long, the conjugated structure of the graphite oxide alkyne nanosheet is seriously damaged, the absorption of the graphite oxide alkyne nanosheet to light is reduced, and the unit oxygen production rate is reduced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The application of the graphite oxide alkyne nanosheet in photolysis of water under visible light to generate oxygen is characterized in that the preparation method of the graphite oxide alkyne nanosheet comprises the following steps:
A) oxidizing graphite alkyne by using mixed strong acid to obtain oxidized graphite alkyne, wherein the mixed strong acid is selected from mixed acid of concentrated sulfuric acid and concentrated nitric acid, and the volume ratio of the concentrated sulfuric acid to the concentrated nitric acid is 1: 2-2: 5;
B) and stripping the graphite oxide alkyne by liquid-phase ultrasonic stripping, and performing centrifugal separation to obtain the graphite oxide alkyne nanosheet.
2. Use according to claim 1, wherein step a) is in particular:
adding the graphdiyne into the strong mixed acid at the temperature of 0 ℃ to obtain a mixture;
and carrying out oxidation reaction on the mixture at the temperature of 25 +/-5 ℃ to obtain the graphite oxide alkyne.
3. The use according to claim 2, wherein the mass volume ratio of the graphdiyne to the strong mixed acid is 50mg:15ml to 60mg:15 ml.
4. The application of claim 1, wherein the liquid phase dispersion liquid adopted in the liquid phase ultrasonic stripping is a mixed liquid of deionized water and concentrated hydrochloric acid, and the volume ratio of the deionized water to the concentrated hydrochloric acid is 40ml:0.05 ml-40 ml:0.06 ml.
5. The use according to claim 4, wherein the mass to volume ratio of the graphite alkyne oxide to the liquid phase dispersion is 10mg:40.05ml to 15mg:40.05 ml.
6. The use according to claim 1, wherein the temperature of the ultrasonic treatment is 5 to 20 ℃; the ultrasonic power of ultrasonic treatment is 100-200W; the ultrasonic frequency of ultrasonic treatment is 20-60 KHz; the ultrasonic treatment time is 20-30 h.
7. Use according to claim 1, wherein the centrifugation conditions are: centrifuging the dispersion liquid stripped from the oxidized graphite alkyne at the rotating speed of 3000 +/-100 rpm for 5 +/-0.5 minutes, and removing precipitates to obtain an upper-layer dispersion liquid;
and centrifuging the upper-layer dispersion liquid for 10 +/-1 minutes at the rotating speed of 8000 +/-500 rpm, and collecting precipitates to obtain the graphite oxide alkyne nanosheet.
8. Use according to claim 1, wherein the thickness of said graphite oxide alkyne nanoplatelets is 1.7 + 0.1nm and the size of the graphite oxide alkyne nanoplatelets lamellae is 120 + 10 nm.
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| CN110668436B (en) * | 2019-11-04 | 2021-06-29 | 北京科技大学 | Preparation method of ultrathin nanoscale graphite alkyne film |
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