CN114225952B - Magnetic nitrogen-doped carbon nanotube and preparation method and application thereof - Google Patents
Magnetic nitrogen-doped carbon nanotube and preparation method and application thereof Download PDFInfo
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- CN114225952B CN114225952B CN202111317899.6A CN202111317899A CN114225952B CN 114225952 B CN114225952 B CN 114225952B CN 202111317899 A CN202111317899 A CN 202111317899A CN 114225952 B CN114225952 B CN 114225952B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 239000002041 carbon nanotube Substances 0.000 title claims abstract description 61
- 229910021393 carbon nanotube Inorganic materials 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
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- STZCRXQWRGQSJD-UHFFFAOYSA-M sodium;4-[[4-(dimethylamino)phenyl]diazenyl]benzenesulfonate Chemical compound [Na+].C1=CC(N(C)C)=CC=C1N=NC1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-UHFFFAOYSA-M 0.000 claims abstract description 40
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- 230000000593 degrading effect Effects 0.000 claims description 6
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- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 5
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 claims description 4
- 238000010525 oxidative degradation reaction Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 2
- XZMCDFZZKTWFGF-UHFFFAOYSA-N Cyanamide Chemical compound NC#N XZMCDFZZKTWFGF-UHFFFAOYSA-N 0.000 claims 1
- 230000015556 catabolic process Effects 0.000 abstract description 20
- 238000006731 degradation reaction Methods 0.000 abstract description 20
- 230000020169 heat generation Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 20
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- 238000012546 transfer Methods 0.000 description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 239000012295 chemical reaction liquid Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
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- RTWWCANQVXFKPJ-UHFFFAOYSA-N 1,3,5-triazine-2,4,6-triamine;trihydrochloride Chemical compound Cl.Cl.Cl.NC1=NC(N)=NC(N)=N1 RTWWCANQVXFKPJ-UHFFFAOYSA-N 0.000 description 2
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
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- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 235000019394 potassium persulphate Nutrition 0.000 description 1
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Classifications
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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
-
- B01J35/33—
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- 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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/484—Treatment of water, waste water, or sewage with magnetic or electric fields using electromagnets
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
- C02F2101/34—Organic compounds containing oxygen
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention discloses a magnetic nitrogen-doped carbon nanotube and a preparation method and application thereof. The composition of the magnetic nitrogen-doped carbon nanotube comprises a nitrogen-doped carbon nanotube and iron nano particles embedded in the nitrogen-doped carbon nanotube. The preparation method of the magnetic nitrogen-doped carbon nano tube comprises the following steps: adding ferric salt and a carbon nitrogen source into a solvent system for mixing and dispersing, removing the solvent, and then placing the mixture in a protective atmosphere for pyrolysis to obtain the magnetic nitrogen-doped carbon nanotube. The magnetic nitrogen-doped carbon nanotube has excellent magnetic performance, simple preparation method and low cost, has induction heat generation characteristic in a high-frequency alternating magnetic field, and can be used for the magnetic induction heating catalytic oxidation degradation of gold orange II.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a magnetic nitrogen-doped carbon nanotube and a preparation method and application thereof.
Background
The printing and dyeing wastewater is wastewater discharged by printing and dyeing enterprises in the process of processing cotton, hemp, chemical fiber and blended products thereof, silk and the like, contains dye, auxiliary agents, acid and alkali, fiber impurities, sand, inorganic salt and the like, has the characteristics of large water quantity, high organic pollutant content, large alkalinity, large water quality change and the like, and belongs to one of industrial wastewater difficult to treat.
Golden orange II is a common organic dye which is widely used for dyeing silk, wool, leather and paper, and can also be used as an index agent and a biological colorant. At present, the treatment method of the golden orange II dye wastewater mainly comprises a physical method, a biological method and a chemical method. The physical method is to remove the organic pollutants in the water body by utilizing the physical action, common treatment modes include gravity sedimentation, centrifugal separation, adsorbent adsorption and the like, and the method does not realize the removal in the real sense, only temporarily transfers the organic pollutants, and is easy to cause secondary pollution. The biological method is to degrade organic pollutants in water body by utilizing the action of microorganisms, common treatment modes include a biological membrane method, an activated sludge method and the like, and the method has the problems of large microbial culture engineering quantity, complex working procedures, easy microbial poisoning, low efficiency and the like. The advanced oxidation technology (AOP) in the chemical method utilizes the strong oxidizing property, high-activity free radical oxidative decomposition and high-efficiency mineralization of organic pollutants as carbon dioxide and water, has the advantages of mild reaction conditions, strong oxidizing capability and the like, has wide application prospect and is widely focused by people.
Therefore, the development of a catalyst suitable for advanced oxidation technology and the application of the catalyst in catalytic degradation of gold orange II dye wastewater has very important significance.
Disclosure of Invention
The invention aims to provide a magnetic nitrogen-doped carbon nano tube, and a preparation method and application thereof.
The technical scheme adopted by the invention is as follows:
a magnetic nitrogen-doped carbon nanotube comprises a nitrogen-doped carbon nanotube and iron nanoparticles embedded in the nitrogen-doped carbon nanotube.
Preferably, the diameter of the nitrogen-doped carbon nanotube is 50 nm-500 nm.
Preferably, the particle size of the iron nanoparticle is 50nm to 500nm.
The preparation method of the magnetic nitrogen-doped carbon nano tube comprises the following steps: adding ferric salt and a carbon nitrogen source into a solvent system for mixing and dispersing, removing the solvent, and then placing the mixture in a protective atmosphere for pyrolysis to obtain the magnetic nitrogen-doped carbon nanotube.
Preferably, the ferric salt is ferric trichloride.
Preferably, the carbon-nitrogen source is at least one of dicyandiamide, dicyandiamide and melamine.
Preferably, the mass ratio of the ferric salt to the carbon-nitrogen source is 1:0.1-1:10.
Preferably, the solvent is at least one of methanol, ethanol and water.
Preferably, the protective atmosphere is a nitrogen atmosphere or an argon atmosphere.
Preferably, the specific operation of pyrolysis is: heating from room temperature (25+/-5 ℃) to 300-900 ℃ at a heating rate of 2-15 ℃/min, and then preserving heat for 1-8 hours.
The method for degrading the golden orange II by catalytic oxidation through magnetic induction heating comprises the following steps: adding a catalyst and persulfate into the gold orange II solution, wherein the catalyst is the magnetic nitrogen doped carbon nanotube, and then placing the carbon nanotube in a high-frequency alternating magnetic field to perform magnetic induction heating catalytic oxidation degradation of gold orange II.
Preferably, the persulfate is at least one of potassium Peroxymonosulphonate (PMS), potassium peroxydisulfate, potassium peroxymonosulphate and potassium peroxymonosulphate composite salt.
Preferably, the mass ratio of the catalyst to the golden orange II is 0.013:1-141:1.
Preferably, the molar ratio of the persulfate to the gold orange II is 0.1:1-10:1.
Preferably, the high-frequency alternating magnetic field is generated by a high-frequency induction heating device, and the oscillation working frequency of the high-frequency induction heating device is 50 kHz-700 kHz.
The beneficial effects of the invention are as follows: the magnetic nitrogen-doped carbon nanotube has excellent magnetic performance, simple preparation method and low cost, has induction heat generation characteristic in a high-frequency alternating magnetic field, and can be used for the magnetic induction heating catalytic oxidation degradation of gold orange II.
Specifically:
1) The magnetic nitrogen-doped carbon nano tube with excellent magnetic performance is prepared by pyrolyzing ferric salt and a carbon nitrogen source, the preparation method is simple, the cost is low, and the method is suitable for large-scale industrial production;
2) According to the invention, the gold orange II is degraded by catalytic oxidation through magnetic induction heating, the magnetic nitrogen doped carbon nano tube is used as an energy transfer station, a solid-phase to liquid-phase heat transfer process is realized in a heterogeneous reaction system, a traditional energy transfer mode is replaced by an accurate micro-interface quasi-two-dimensional transfer mode, the loss of energy in the transfer process is reduced, and the high-temperature effect of a micro-reaction interface is combined, so that the oxidation degradation efficiency of the gold orange II can be effectively improved;
3) The invention adopts a non-contact energy input technology-electromagnetic induction heating technology, utilizes the heat generation characteristic of the magnetic material in a high-frequency alternating magnetic field to heat the magnetic material to a certain temperature, realizes the solid-liquid phase heat transfer process in a heterogeneous reaction system, does not need to heat a reactor and other parts which do not participate in the reaction, realizes the high-efficiency utilization of energy, and is safer and cleaner by using electric energy as energy input, and meets the requirement of sustainable development.
Drawings
Fig. 1 is an SEM image of the magnetic nitrogen-doped carbon nanotube of example 1.
Fig. 2 is a TEM image of a magnetic nitrogen-doped carbon nanotube of example 1.
Fig. 3 is an XRD pattern of the magnetic nitrogen-doped carbon nanotube of example 1.
FIG. 4 is an ultraviolet-visible absorption spectrum of the reaction solution for different reaction times in the process of catalytic oxidative degradation of gold orange II by magnetic induction heating.
Detailed Description
The invention is further illustrated and described below in connection with specific examples.
Example 1:
the preparation method of the magnetic nitrogen-doped carbon nano tube comprises the following steps:
adding 1g of ferric trichloride and 1g of melamine into 200mL of absolute ethyl alcohol, carrying out ultrasonic treatment for 10min, stirring for 1h, then placing the mixture in an oven for drying at 100 ℃ for 10h, grinding the dried powder, placing the powder into a porcelain boat, placing the porcelain boat into a tube furnace for nitrogen protection, then heating from room temperature to 700 ℃ at a heating rate of 10 ℃/min, carrying out heat preservation for 2h, and naturally cooling to room temperature to obtain the magnetic nitrogen-doped carbon nanotube.
Performance test:
the magnetic nitrogen-doped carbon nanotubes prepared in this example were shown in a Scanning Electron Microscope (SEM) chart of fig. 1, a Transmission Electron Microscope (TEM) chart of fig. 2 (a and b in the drawing represent different magnifications), and an X-ray diffraction (XRD) chart of fig. 3.
As can be seen from fig. 1: the magnetic nitrogen-doped carbon nano tube has a uniform tubular structure and has a diameter of about 100 nm.
As can be seen from fig. 2: the inside of the nitrogen-doped carbon nano tube is filled with a large amount of nano particles, the nano particles are aggregated to form a pod-like structure, the tube wall of the nitrogen-doped carbon nano tube is provided with a plurality of folds, and a small amount of nano particles are attached to the surface of the tube wall.
As can be seen from fig. 3: the inside of the nitrogen-doped carbon nano tube is filled with Fe nano particles, and weak Fe appears in the figure 3 O 4 The characteristic peak is due to trace oxygen still remaining in the tube furnace when pyrolysis is performed.
Example 2:
the preparation method of the magnetic nitrogen-doped carbon nano tube comprises the following steps:
adding 2g of ferric trichloride and 1g of melamine into 200mL of absolute ethyl alcohol, carrying out ultrasonic treatment for 10min, stirring for 1h, then placing the mixture in an oven for drying at 100 ℃ for 10h, grinding the dried powder, placing the powder into a porcelain boat, placing the porcelain boat into a tube furnace for nitrogen protection, then heating from room temperature to 700 ℃ at a heating rate of 10 ℃/min, carrying out heat preservation for 2h, and naturally cooling to room temperature to obtain the magnetic nitrogen-doped carbon nanotube.
A method for degrading gold orange II by catalytic oxidation through magnetic induction heating, which comprises the following steps:
225mg of the magnetic nitrogen-doped carbon nanotube prepared in the embodiment and 80mL of gold orange II solution with the concentration of 1.5g/L are added into a reaction bottle, the reaction bottle is placed in a high-frequency induction heating device, an optical fiber temperature measuring probe is arranged to measure the temperature of a reaction liquid in real time, 40mg of potassium Peroxomonosulphonate (PMS) is added into the reaction bottle, the high-frequency induction heating device is immediately started and timing is started, the working current is 24A, the oscillation working frequency is 300kHz, the reaction time is 2h, 1mL of reaction liquid is taken out every certain time, the reaction liquid is filtered by a polytetrafluoroethylene filter with the aperture of 0.25 mu m, the methanol quenching reaction is rapidly added, the ultraviolet-visible absorption spectrum obtained by measuring is shown in a graph of FIG. 4, in addition, the temperature of the reaction liquid is 98 ℃ when the reaction is carried out for 2h, and the degradation rate of gold orange II is 98.7%.
As can be seen from fig. 4: the magnetic nitrogen-doped carbon nanotube prepared by the embodiment is used as a catalyst, so that the gold orange II can be basically and completely degraded within 120 min.
Example 3:
the preparation method of the magnetic nitrogen-doped carbon nano tube comprises the following steps:
adding 2g of ferric trichloride and 1g of dicyandiamide into 200mL of absolute ethyl alcohol, carrying out ultrasonic treatment for 10min, stirring for 1h, then placing the mixture in an oven for drying at 100 ℃ for 10h, grinding the dried powder, placing the powder into a porcelain boat, placing the porcelain boat into a tube furnace for nitrogen protection, then heating from room temperature to 700 ℃ at a heating rate of 10 ℃/min, carrying out heat preservation for 2h, and naturally cooling to room temperature to obtain the magnetic nitrogen-doped carbon nanotube.
With reference to the operation of example 2, the magnetic nitrogen-doped carbon nanotube prepared in this example was used to perform an experiment of magnetically-induced heating catalytic oxidation degradation of gold orange II, and the temperature of the reaction solution was 95 ℃ and the degradation rate of gold orange II was 92.1% when the reaction was performed for 2 hours.
Examples 4 to 14:
the preparation method of the magnetic nitrogen-doped carbon nano tube comprises the following steps:
adding 1g of ferric trichloride and 1g of melamine into 200mL of absolute ethyl alcohol, carrying out ultrasonic treatment for 10min, stirring for 1h, then placing the mixture in an oven for drying at 100 ℃ for 10h, grinding the dried powder, placing the powder into a porcelain boat, placing the porcelain boat into a tubular furnace, charging nitrogen for protection, heating from room temperature to 300-900 ℃ at a heating rate of 2-15 ℃/min, carrying out heat preservation for 1-8 h, and naturally cooling to room temperature to obtain the magnetic nitrogen-doped carbon nanotube.
Referring to the operation of example 2, the magnetic nitrogen-doped carbon nanotubes prepared under different pyrolysis conditions in this example were used to perform a magnetic induction heating catalytic oxidation degradation experiment on gold orange II, and the degradation effect of gold orange II is shown in the following table:
TABLE 1 gold orange II degradation effects of magnetic Nitrogen doped carbon nanotubes prepared under different pyrolysis conditions
Examples 15 to 20:
the preparation method of the magnetic nitrogen-doped carbon nano tube comprises the following steps:
adding 0.5g of ferric trichloride and 0.05-5 g of melamine into 200mL of absolute ethyl alcohol, carrying out ultrasonic treatment for 10min, stirring for 1h, drying in a baking oven at 100 ℃ for 10h, grinding the dried powder, putting into a tube furnace after loading a porcelain boat, charging nitrogen for protection, heating from room temperature to 700 ℃ at a heating rate of 10 ℃/min, carrying out heat preservation for 2h, and naturally cooling to room temperature to obtain the magnetic nitrogen-doped carbon nanotube.
Referring to the operation of example 2, the magnetic nitrogen-doped carbon nanotubes prepared in this example under different ferric trichloride-melamine ratios were used to perform the experiment of magnetically-induced heating catalytic oxidation degradation of gold orange II, and the degradation effect of gold orange II obtained is shown in the following table:
TABLE 2 gold orange II degradation effect of magnetic Nitrogen doped carbon nanotubes prepared under different ferric trichloride-Melamine ratios
Examples 21 to 24:
a method for degrading gold orange II by catalytic oxidation through magnetic induction heating, which comprises the following steps:
225mg of the magnetic nitrogen-doped carbon nanotube prepared in the example 2 and 80mL of gold orange II solution with the concentration of 1.5g/L are added into a reaction bottle, the reaction bottle is placed in a high-frequency induction heating device, an optical fiber temperature measuring probe is arranged to measure the temperature of a reaction liquid in real time, 40mg of potassium Peroxomonosulphonate (PMS) is added into the reaction bottle, the high-frequency induction heating device is immediately started and timing is started, the working current is 24A, the oscillation working frequency is 50 kHz-700 kHz, the reaction time is 2h, and the gold orange II degradation effect of the high-frequency induction heating device obtained through testing under different oscillation working frequencies is shown in the following table:
table 3 effect of high frequency induction heating apparatus on degradation of gold orange II at different oscillation operating frequencies
Examples 25 to 28:
a method for degrading gold orange II by catalytic oxidation through magnetic induction heating, which comprises the following steps:
adding 1.6-800 mg of the magnetic nitrogen-doped carbon nanotube prepared in the embodiment 2 and 80mL of gold orange II solution with the concentration of 1.5g/L into a reaction bottle, enabling the concentration of the magnetic nitrogen-doped carbon nanotube in the reaction solution to be 0.02 g/L-10 g/L, placing the reaction bottle into a high-frequency induction heating device, setting an optical fiber temperature measuring probe to measure the temperature of the reaction solution in real time, adding 40mg of potassium Peroxomonosulphate (PMS) into the reaction bottle, immediately starting the high-frequency induction heating device and starting timing, enabling the working current to be 24A, enabling the oscillation working frequency to be 300kHz, enabling the reaction time to be 2h, and testing the obtained gold orange II degradation effect under the condition of different addition amounts of the magnetic nitrogen-doped carbon nanotube to be shown in the following table:
TABLE 4 degradation effect of gold orange II with different magnetic Nitrogen doped carbon nanotubes
Examples 29 to 36:
a method for degrading gold orange II by catalytic oxidation through magnetic induction heating, which comprises the following steps:
225mg of the magnetic nitrogen-doped carbon nanotube prepared in the example 2 and 80mL of gold orange II solution with the concentration of 0.02g/L to 10g/L are added into a reaction bottle, the reaction bottle is placed in a high-frequency induction heating device, an optical fiber temperature measurement probe is arranged to measure the temperature of a reaction liquid in real time, 0.56mg to 2807.6mg of potassium Peroxomonosulphate (PMS) is added into the reaction bottle, the molar ratio of the PMS to the gold orange II is 0.1:1 to 10:1, the high-frequency induction heating device is immediately started and timing is started, the working current is 24A, the oscillation working frequency is 300kHz, the reaction time is 2 hours, and the gold orange II degradation effect under the conditions of different gold orange II concentrations and PMS-gold orange II molar ratios is tested as shown in the following table:
TABLE 5 gold orange II degradation effect under different gold orange II concentrations and PMS-gold orange II molar ratios
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (4)
1. The magnetic nitrogen-doped carbon nanotube is characterized by comprising a nitrogen-doped carbon nanotube and iron nano particles embedded in the nitrogen-doped carbon nanotube; the diameter of the nitrogen-doped carbon nano tube is 50 nm-500 nm; the particle size of the iron nano particles is 50 nm-500 nm; the magnetic nitrogen-doped carbon nanotube is prepared by a preparation method comprising the following steps: adding ferric salt and a carbon nitrogen source into a solvent system for mixing and dispersing, removing the solvent, and then placing the mixture in a protective atmosphere for pyrolysis to obtain the magnetic nitrogen-doped carbon nanotube; the ferric salt is ferric trichloride; the carbon-nitrogen source is at least one of cyanamide, dicyandiamide and melamine; the mass ratio of the ferric salt to the carbon-nitrogen source is 1:0.1-1:10; the specific operation of the pyrolysis is as follows: heating from room temperature to 700-900 ℃ at a heating rate of 2-15 ℃ per minute, and then preserving heat for 1-8 hours.
2. The method for degrading the golden orange II by catalytic oxidation through magnetic induction heating is characterized by comprising the following steps of: adding a catalyst and persulfate into the gold orange II solution, wherein the catalyst is the magnetic nitrogen-doped carbon nanotube as claimed in claim 1, and then placing the carbon nanotube in a high-frequency alternating magnetic field to perform magnetic induction heating catalytic oxidative degradation of gold orange II.
3. The method for catalytic oxidative degradation of gold orange II by magnetic induction heating according to claim 2, wherein the method comprises the steps of: the mass ratio of the catalyst to the golden orange II is 0.013:1-141:1; the molar ratio of the persulfate to the golden orange II is 0.1:1-10:1.
4. A method for catalytic oxidative degradation of gold orange II by magnetic induction heating according to claim 2 or 3, characterized in that: the high-frequency alternating magnetic field is generated by a high-frequency induction heating device, and the oscillation working frequency of the high-frequency induction heating device is 50 kHz-700 kHz.
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