CN112717976A - Stripped body phase g-C3N4Preparation method and application of - Google Patents
Stripped body phase g-C3N4Preparation method and application of Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 28
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 claims abstract description 59
- 239000000463 material Substances 0.000 claims abstract description 36
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 20
- 239000011734 sodium Substances 0.000 claims abstract description 20
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 8
- 230000001699 photocatalysis Effects 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 230000007935 neutral effect Effects 0.000 claims abstract description 6
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- 239000007788 liquid Substances 0.000 claims abstract description 5
- 239000003054 catalyst Substances 0.000 claims abstract description 4
- 238000007146 photocatalysis Methods 0.000 claims abstract description 4
- -1 sodium alkoxide Chemical class 0.000 claims abstract description 3
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 12
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 claims description 11
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 2
- 238000000967 suction filtration Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 12
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 abstract description 8
- 229940043267 rhodamine b Drugs 0.000 abstract description 8
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 abstract description 6
- 229960000907 methylthioninium chloride Drugs 0.000 abstract description 6
- 230000006378 damage Effects 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 abstract description 4
- 238000002360 preparation method Methods 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 3
- QDRKDTQENPPHOJ-UHFFFAOYSA-N sodium ethoxide Chemical compound [Na+].CC[O-] QDRKDTQENPPHOJ-UHFFFAOYSA-N 0.000 description 19
- 239000000243 solution Substances 0.000 description 18
- 239000000975 dye Substances 0.000 description 9
- 230000015556 catabolic process Effects 0.000 description 7
- 238000006731 degradation reaction Methods 0.000 description 7
- 238000004299 exfoliation Methods 0.000 description 7
- WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical compound [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
- 239000011259 mixed solution Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- MFRIHAYPQRLWNB-UHFFFAOYSA-N sodium tert-butoxide Chemical compound [Na+].CC(C)(C)[O-] MFRIHAYPQRLWNB-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 235000019441 ethanol Nutrition 0.000 description 3
- 239000011343 solid material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 229910021389 graphene Inorganic materials 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical group C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
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- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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- 230000000593 degrading effect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002135 nanosheet Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011941 photocatalyst Substances 0.000 description 1
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
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- 238000005215 recombination Methods 0.000 description 1
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- 239000011435 rock Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 238000012719 thermal polymerization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/24—Nitrogen compounds
-
- B01J35/39—
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- C—CHEMISTRY; METALLURGY
- 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
-
- C—CHEMISTRY; METALLURGY
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/40—Organic compounds containing sulfur
Abstract
The present invention provides a exfoliated phase g-C3N4The preparation method comprises the following steps of (1) slowly adding metal sodium into alcohol, and continuously stirring for 2 hours until the metal sodium completely reacts to obtain a sodium alkoxide solution; (2) slowly adding into bulk phaseg‑C3N4Heating and stirring for stripping, filtering and washing to be neutral, and drying. The invention reduces the harm of the stripped waste liquid to equipment and environment, and the stripped carbon nitride material obtained by the method can be used as a catalyst in photocatalysis and wastewater treatment, and can be applied to photocatalysis and wastewater treatmentThe efficiency of dissolving rhodamine B and methylene blue under the condition of visible light is respectively improved by 19.5 percent and 17.98 percent compared with bulk-phase carbon nitride, and the method has good application effect.
Description
Technical Field
The invention belongs to the technical field of carbon nitride materials, and particularly relates to a stripper phaseg-C3N4The preparation method and the application thereof.
Background
Two-dimensional (2D) graphitic carbon nitride since its discovery by scientists in 1834g-C3N4) Photocatalytic material for H as a promising organic semiconductor2Production, pollutant treatment and CO2Reduction, due to its unique optical and electronic properties, is very important in photocatalytic, non-toxic and convenient synthetic routes, and has attracted great attention. The carbon nitride material has a structure similar to that of graphene and is formed by stacking two-dimensional carbon and nitrogen atomic layers. Bulk phase prepared by simple high temperature thermal polymerizationg-C3N4The defects of compact accumulation, small specific surface area, narrow response range to visible light, quick recombination of photo-generated electron-hole pairs and the like exist, and the large-scale popularization and application of the photo-generated electron-hole pairs are limited. Therefore, inspired by hummers method for preparing graphene oxide, the method of stripping carbon nitride by adopting concentrated sulfuric acid is applied to preparationg-C3N4A nanosheet of (a). However, concentrated sulfuric acid has strong oxidizing property and corrosivity, the requirement on experimental operation is high, and the stripping waste liquid has great harm to the environment. Therefore, the invention explores a new method for stripping the carbon nitride material by sodium ethoxide, provides a new scheme for solving the problems of low visible light utilization rate, difficult stripping, environment friendliness and the like of the carbon nitride material, verifies that the method does not damage the structure of the carbon nitride, and explores the removal effect of the carbon nitride material on soluble organic dye before and after stripping under the visible light condition.
Disclosure of Invention
In order to solve the problems of low visible light utilization rate, difficult stripping, small specific surface area and the like of the carbon nitride material, the carbon nitride material is enhanced in H2Production, pollutant treatment and CO2The invention provides a novel method for stripping a carbon nitride material by sodium ethoxide, and the carbon nitride material treated by the method can effectively enhance the degradation effect on organic dyes such as methylene blue and rhodamine B under the condition of visible light.
In order to solve the technical problems, the invention provides one of the following technical schemesThe method for stripping the carbon nitride comprises the following steps of (1) slowly adding metal sodium into alcohol, and continuously stirring for 2 hours until the metal sodium completely reacts to obtain a sodium alkoxide solution; (2) slowly adding into bulk phaseg-C3N4And (4) obtaining stripping liquid, heating and stirring for stripping, performing suction filtration and washing to be neutral, and drying.
Preferably, in step (1), the alcohol includes one or more of methanol, ethanol and tert-butanol.
Preferably, the bulk phaseg-C3N4The mass ratio of the sodium metal to the sodium metal is 1 (1-2).
Preferably, in the step (2), the heating and stirring are carried out at the temperature of 40-80 ℃ for 6-12 hours.
Preferably, in the step (2), the drying is performed at 60 ℃ for 12 h.
Preferably, in the step (2), the concentration of the stripping solution is 3-10 g/L.
As another aspect of the invention, the invention provides a post-spalling carbon nitride material.
As another aspect of the invention, the invention provides the use of the exfoliated carbon nitride material as a catalyst in photocatalysis and wastewater treatment.
Preferably, the wastewater is organic dye wastewater.
The invention has the beneficial effects that:
the reagent required by the invention has low danger and simple operation process, and does not need complex and expensive equipment. The invention reduces the harm of the stripped waste liquid to equipment and environment; the preparation method provided by the invention is determined by characterization means such as XRD, infrared spectrogram and SEM that the structure of the carbon nitride material is not damaged, and the efficiency of the prepared stripped carbon nitride material as a photocatalyst for degrading rhodamine B and methylene blue is improved by 19.5% and 17.98% respectively compared with bulk-phase carbon nitride.
Drawings
FIG. 1 is an XRD pattern of the carbon nitride material before and after exfoliation of sodium ethoxide prepared in example 2;
FIG. 2SEM images of carbon nitride material before and after sodium ethoxide exfoliation prepared for example 2, wherein a and b areg-C3N4SEM pictures of different specifications before stripping, c and d are sodium ethoxide strippingg-C3N4SEM pictures under different specifications;
FIG. 3 is a Fourier infrared spectrum of the carbon nitride material before and after sodium ethoxide exfoliation prepared in example 2;
FIG. 4 is a graph showing the effect of carbon nitride materials on rhodamine B degradation before and after sodium ethoxide exfoliation, prepared in example 2, wherein the front and back correspond to the left and right, respectively;
FIG. 5 is a graph showing the degradation effect of the carbon nitride material on methylene blue before and after stripping sodium ethoxide prepared in example 2, wherein the front and the back correspond to the left and the right, respectively;
FIG. 6 is a schematic structural diagram of the sodium ethoxide exfoliated carbon nitride material prepared by the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Bulk phase for use in the inventiong-C3N4The material is prepared by the following steps:
taking melamine as a raw material, heating to 400 ℃ at a speed of 10 ℃/min in a muffle furnace, and keeping the temperature for 1 h; then continuously heating to 550 ℃, preserving heat for 2 hours, cooling to room temperature, taking out and grinding to obtain the product.
Example 1
A novel method for stripping carbon nitride is characterized by comprising the following steps:
(1) adding 150 ml of methanol into a 250 ml three-neck flask, weighing 1 g of metal sodium, slowly adding the metal sodium into a methanol solution, continuously stirring for 6 hours, generating bubbles at the moment, and obtaining a sodium methoxide solution after the metal sodium completely reacts;
(2) weighing 1 g of bulk phaseg-C3N4The material is slowly added into the mixed solution in the sodium methoxide solution in the step (1), and then the mixed solution is put into an oil bath kettle at the temperature of 70 ℃ to be heated, refluxed, stirred and stripped for 12 hours.
(3) And (3) filtering and washing the reaction mixed liquor obtained in the step (2) to be neutral, then placing the solid material in an oven for drying at 60 ℃ for 12 h, grinding and bottling to obtain the sodium methoxide stripping carbon nitride.
Example 2
A novel method for stripping carbon nitride is characterized by comprising the following steps:
(1) adding 150 ml of absolute ethyl alcohol into a 250 ml three-neck flask, weighing 1 g of metal sodium, slowly adding the metal sodium into the absolute ethyl alcohol, continuously stirring for 6 hours, generating bubbles at the moment, and obtaining a sodium ethoxide solution after the metal sodium completely reacts;
(2) weighing 1 g of bulk phaseg-C3N4The materials are slowly added into the mixed solution of the sodium ethoxide solution in the step (1), the solution gradually becomes light yellow silky milk, and then the mixture is put into an oil bath kettle at the temperature of 70 ℃ to be heated, refluxed, stirred and stripped for 12 hours.
(3) And (3) filtering and washing the reaction mixed liquor obtained in the step (2) to be neutral, then placing the solid material in an oven for drying at 60 ℃ for 12 h, grinding and bottling to obtain the sodium ethoxide-stripped carbon nitride.
The effect of the stripping method was analyzed as the results of example 2. From the XRD diffractogram of fig. 1, it can be seen that the carbon nitride before and after exfoliation has a similar diffraction peak at 27.3 °, indicating that the crystal structures before and after exfoliation are the same, corresponding to the (002) crystal plane of the carbon nitride, indicating that the exfoliation method does not change the crystal structure of the carbon nitride; in FIG. 2, a and b are scanning electron microscope images of 500 nm and 5 nm of bulk carbon nitride, respectively, and it can be seen that the bulk structure of the bulk carbon nitride material is more obvious and is similar to a stone shape; and c and d are scanning electron microscope images of 500 nm and 5 nm of carbon nitride stripped by sodium ethoxide, compared with a and b, the blocky structures in the c and d images are obviously reduced, and the stripped carbon nitride in the d image is found to show a loose and multi-fold structure similar to lamellar rock for the 5 nm image, which indicates that the stripping method effectively improves the appearance and lamellar structure of bulk phase carbon nitride. FIG. 3 is a Fourier infrared spectrum of 810 cm-1Is a characteristic absorption peak corresponding to bending vibration of the triazine ring, 890 cm-1Is the vibration signal of the N-H bond, and is at 1100-1700 cm-1The absorption wave band shows that the C-N heterocyclic ring stretches and contracts and vibrates to absorb [ C-N (-C) -C or C-NH-C]3000 + 3700 cm-1Residual N-H in the non-condensed amino group and vibrational signals from the adsorption of-OH bonds in water molecules. In addition, the characteristic absorption peak of the carbon nitride after the sodium ethoxide stripping is sharper, which indicates that the crystal crystallinity of the stripped polymer after the sodium ethoxide is better; FIG. 4 is a diagram of the degradation effect of a carbon nitride material on rhodamine B before and after sodium ethoxide stripping, wherein the left and right diagrams are respectively the effect of bulk-phase carbon nitride and the effect of carbon nitride after sodium ethoxide stripping on rhodamine B, so that the effect of carbon nitride after stripping on rhodamine B is better, the time for dye solution decoloration is faster, and the stripping method is proved to improve the photocatalytic activity of the carbon nitride material; in fig. 5, the left and right images are respectively the effect images of the carbon nitride after stripping the bulk phase carbon nitride and sodium ethoxide to degrade methylene blue, and it is obvious that the carbon nitride material after stripping has better degradation and decoloration effects. Therefore, the characterization tests and experiments show that the stripping method can effectively improve the photocatalytic performance of the carbon nitride material.
Example 3
A novel method for stripping carbon nitride is characterized by comprising the following steps:
(1) adding 150 ml of tert-butyl alcohol into a 250 ml three-neck flask, weighing 1 g of metal sodium, slowly adding the metal sodium into absolute ethyl alcohol, continuously stirring for 6 hours, generating bubbles at the moment, and obtaining a sodium tert-butyl alcohol solution after the metal sodium completely reacts;
(2) weighing 1 g of bulk phaseg-C3N4Slowly adding the materials into the sodium tert-butoxide solution obtained in the step (1) to obtain a mixed solution, and continuously stirring and stripping the mixed solution at 70 ℃ for 12 h.
(3) And (3) filtering and washing the reaction mixed liquor obtained in the step (2) to be neutral, then placing the solid material in an oven for drying at 60 ℃ for 12 h, grinding and bottling to obtain the sodium tert-butoxide stripped carbon nitride.
The sodium ethoxide stripping carbon nitride material prepared by the invention has a structure shown as a formula I in figure 6. The stripping method employed in the present invention is not changedg-C3N4But enhances its degradation properties.The invention also provides application of the carbon nitride material stripped by the sodium ethoxide to photocatalytic degradation of organic dyes rhodamine B and methylene blue, wherein the dye concentration is controlled at 10 ppm, 50 mg of the carbon nitride material before and after stripping is weighed, 50 ml of organic dye wastewater is added, after the material and the solution are uniformly dispersed by ultrasonic treatment for 10min, a dark reaction is carried out for 1h to achieve the adsorption and desorption balance of the catalyst on the dye solution, a lamp is turned on for degradation of the dye under visible light, 4 ml of the solution is extracted at intervals, the solution is centrifuged, and the supernatant is taken to determine the ultraviolet-visible absorption spectrum. The results are shown in FIGS. 3-5.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (9)
1. A method for stripping carbon nitride is characterized in that: comprises the following steps of (a) carrying out,
(1) slowly adding metal sodium into alcohol, and continuously stirring for 2 h until the metal sodium completely reacts to obtain a sodium alkoxide solution;
(2) slowly adding into bulk phaseg-C3N4And (4) obtaining stripping liquid, heating and stirring for stripping, performing suction filtration and washing to be neutral, and drying.
2. The method for stripping carbon nitride according to claim 1, wherein in step (1), the alcohol comprises one or more of methanol, ethanol and tert-butyl alcohol.
3. The method for stripping carbon nitride according to claim 1 or 2, characterized in that: said bulk phaseg-C3N4The mass ratio of the sodium metal to the sodium metal is 1 (1-2).
4. The method for stripping carbon nitride according to claim 1, wherein: in the step (2), the mixture is heated and stirred at the temperature of 40-80 ℃ for 6-12 hours.
5. The method for stripping carbon nitride according to claim 1, wherein: in the step (2), the drying is carried out for 12 hours at the temperature of 60 ℃.
6. The method of claim 1, wherein: in the step (2), the concentration of the stripping solution is 3-10 g/L.
7. A stripped carbon nitride material obtained by the method according to any one of claims 1 to 6.
8. Use of the exfoliated carbon nitride material of claim 7 as a catalyst in photocatalysis and wastewater treatment.
9. Use according to claim 8, characterized in that: the wastewater is organic dye wastewater.
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CN104437589A (en) * | 2014-11-07 | 2015-03-25 | 江苏大学 | Silver/graphene oxide/carbon nitride composite photocatalytic material and preparation method thereof |
CN104475140A (en) * | 2014-11-07 | 2015-04-01 | 江苏大学 | Silver-modified carbon nitride composite photocatalytic material and preparation method thereof |
CN108671951A (en) * | 2018-04-17 | 2018-10-19 | 浙江工商大学 | A kind of nitridation carbon composite photocatalyst and its preparation method and application |
CN110882714A (en) * | 2019-12-16 | 2020-03-17 | 吉林大学 | Curled carbon nitride thin sheet, preparation method and application thereof in hydrogen production through photocatalytic water decomposition |
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