CN116474814A - Preparation method and application of composite carrier ozone catalyst - Google Patents
Preparation method and application of composite carrier ozone catalyst Download PDFInfo
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- CN116474814A CN116474814A CN202310482375.5A CN202310482375A CN116474814A CN 116474814 A CN116474814 A CN 116474814A CN 202310482375 A CN202310482375 A CN 202310482375A CN 116474814 A CN116474814 A CN 116474814A
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- 239000003054 catalyst Substances 0.000 title claims abstract description 33
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000002131 composite material Substances 0.000 title claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 91
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 82
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 79
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000001354 calcination Methods 0.000 claims abstract description 15
- 239000011259 mixed solution Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002351 wastewater Substances 0.000 claims abstract description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 11
- GZUXJHMPEANEGY-UHFFFAOYSA-N bromomethane Chemical compound BrC GZUXJHMPEANEGY-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000003197 catalytic effect Effects 0.000 claims abstract description 10
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000004108 freeze drying Methods 0.000 claims abstract description 9
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 9
- 238000001704 evaporation Methods 0.000 claims abstract description 8
- 230000004048 modification Effects 0.000 claims abstract description 8
- 238000012986 modification Methods 0.000 claims abstract description 8
- 239000003245 coal Substances 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 230000008020 evaporation Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 4
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 3
- 238000006385 ozonation reaction Methods 0.000 claims description 3
- 229910021529 ammonia Inorganic materials 0.000 claims description 2
- 238000003556 assay Methods 0.000 claims 1
- GZUXJHMPEANEGY-BJUDXGSMSA-N bromomethane Chemical group Br[11CH3] GZUXJHMPEANEGY-BJUDXGSMSA-N 0.000 claims 1
- 230000004907 flux Effects 0.000 claims 1
- 238000003837 high-temperature calcination Methods 0.000 claims 1
- 230000035484 reaction time Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- -1 hydroxyl radicals Chemical class 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 238000006731 degradation reaction Methods 0.000 abstract description 2
- 238000005470 impregnation Methods 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 230000027756 respiratory electron transport chain Effects 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 230000009849 deactivation Effects 0.000 abstract 1
- 238000004065 wastewater treatment Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000000593 degrading effect Effects 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000013335 mesoporous material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
-
- 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
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
Abstract
The invention belongs to the field of coal chemical wastewater treatment, and discloses a preparation method and application of a composite carrier ozone catalyst, wherein the preparation method comprises the following steps: the pretreated carbon nano tube is used as a carrier, a catalyst is prepared by adopting an impregnation-calcination method, and the catalyst is modified by adopting a bromomethane method. (1) Placing the industrial-grade carbon nano tube into concentrated nitric acid for treatment, and finally freeze-drying the cleaned carbon nano tube to obtain a pretreated carbon nano tube (CNT-P); (2) Co (NO) 3 ) 2 ·6H 2 Mixing O, citric acid and absolute ethanol, adding CNT-P into the mixed solution, evaporating in water bath, and continuously introducing N 2 Calcining at high temperature to obtain Co-loaded carbon nanotube (CNT-Co), and then proceedingRow N doping and CH 3 Br modification to obtain bromomethane modified Co/N loaded carbon nanotube (CH) 3 Br@CNT‑Co/N)。CH 3 Br@CNT-Co/N is used for catalyzing ozone to oxidize coal chemical wastewater, and COD degradation efficiency reaches 90%. The carbon nano tube and Co/N are combined through impregnation and calcination, so that the catalyst has excellent synergistic effect, oxygen-containing groups on the surface of the catalyst promote the chain reaction of ozone to generate hydroxyl radicals, and the carbon nano tube promotes the electron transfer process of the reaction, and CH is adopted 3 The Br is modified to reduce the problems of catalyst deactivation and metal loss of the catalyst in the catalytic ozone, and improve the stability of the catalyst.
Description
Technical Field
The invention belongs to catalytic oxidation, and particularly relates to a preparation method and application of a composite carrier ozone catalyst.
Background
At present, the coal chemical wastewater has complex water quality, contains a large amount of refractory pollutants, has high COD and chromaticity, and belongs to industrial organic wastewater with high treatment difficulty. Ozone oxidation alone is inefficient and contaminants are degraded less efficiently. Catalytic ozonation is a high-grade oxidation technology, and the core is that an active site on a catalyst can enable ozone to release more hydroxyl radicals, and the hydroxyl radicals can react with refractory organic wastewater to oxidize the refractory organic wastewater into CO 2 And H 2 O, thereby achieving the effect of degrading the wastewater.
In recent years, carbon nanotubes have been widely focused on due to their excellent physicochemical properties, and are a promising catalyst and catalyst carrier. However, it is often difficult to obtain the desired catalytic effect of ozone on degrading organic pollutants with a single carbon nanotube. The patent CN200610010126.2 adopts carbon nano tube to catalyze ozone to treat wastewater, so that the generation of organic acid is avoided, but the treatment time is long and the treatment efficiency is lower. Therefore, it is necessary to modify the carbon nanotubes, and the modified carbon nanotubes are used for catalytic ozonation.
Through the above analysis, the problems and defects existing in the prior art are as follows:
(1) The ozone catalytic effect alone is unstable, the treatment efficiency is low, and the waste water after treatment is difficult to discharge up to the standard, and a large amount of manpower and material resources are wasted.
(2) The variety of pollutants is various, and the ideal effect of catalyzing ozone to degrade organic pollutants is difficult to obtain by a single carbon nano tube.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a preparation method and application of a composite carrier ozone catalyst.
The invention is realized in such a way that the preparation steps of the composite carrier catalyst are as follows:
(1) Heating, stirring, filtering and cleaning industrial-grade carbon nanotubes in concentrated nitric acid, and finally freeze-drying the cleaned carbon nanotubes to obtain pretreated carbon nanotubes (CNT-P);
(2) Co (NO) 3 ) 2 ·6H 2 Mixing O, citric acid and absolute ethyl alcohol, then placing the CNT-P into the mixed solution for water bath evaporation, continuously introducing nitrogen and calcining at high temperature, and finally obtaining the Co-loaded carbon nanotube (CNT-Co);
(3) Co-supported carbon nanotubes (CNT-Co) are N-doped and CH-doped 3 Br modification to obtain bromomethane modified Co/N loaded carbon nanotube (CH) 3 Br@CNT-Co/N)。
Another object of the present invention is to provide a method for treating carbon nanotubes, comprising the steps of:
(1) Heating industrial-grade carbon nanotubes in concentrated nitric acid, and magnetically stirring at constant temperature for 14h;
(2) Filtering the mixed solution with a 0.22um filter membrane, cleaning the carbon nano tube and adjusting the pH value to 6;
(3) Finally, freeze-drying the cleaned carbon nanotubes to obtain the pretreated carbon nanotubes (CNT-P).
Another object of the present invention is to provide a bromomethane-modified Co/N-supported carbon nanotube (CH 3 br@cnt-Co/N) preparation steps are:
(1) Co (NO) 3 ) 2 ·6H 2 Mixing O and citric acid according to a mass ratio of 1:2, and adding absolute ethyl alcohol, wherein the mass ratio of the mixture to the absolute ethyl alcohol is 1:10;
(2) Mixing the pretreated carbon nano tube and the mixed solution according to the mass ratio of 1:5, and heating in a water bath at 90 ℃ to obtain a treated carbon nano tube mixture;
(3) Calcining the treated carbon nanotube mixture at a high temperature at 600 ℃ under the nitrogen flow of 60ml/min to finally obtain a Co-loaded carbon nanotube (CNT-Co);
(4) Stopping N when the temperature is reduced to below 200 DEG C 2 Introducing ammonia gas, reacting for 60min, and introducing CH 3 Br gas, reacting for 30min to obtain bromomethane modified Co/N loaded carbon nanotube (CH) 3 Br@CNT-Co/N)。
By combining all the technical schemes, the invention has the advantages and positive effects that:
(1) The carbon nano tube and Co/N are combined through impregnation and calcination, so that excellent synergistic effect is achieved, the oxygen-containing groups on the surface of the catalyst promote the chain reaction of generating hydroxyl free radicals by ozone, the carbon nano tube promotes the electron transfer process of the reaction, and the ozone utilization rate is improved by adding the catalyst.
(2) CNTs have a slightly smaller specific surface area, but are mesoporous materials, and have no micropores, so that the CNTs are likely to be more beneficial to adsorption and reaction of organic matters on the surface of CNTs. The Co/N doped carbon nanotube prepared by the method solves the problem that the nonmetal modified carbon nanotube is easy to disperse in water and the problem that the metal modification is easy to deactivate, and the more adsorption sites generated on the unit surface of the catalyst are due to the addition of ammonia, the better the catalytic effect is, and the high catalytic efficiency is achieved.
(3)CH 3 Br can reduce the size of the particles while enhancing adsorption of metals. Co metal loss can cause the reduction of catalyst activity, co loss is related to the concentration of Co grains on the surface of the carbon nano tube, penetration is shallower, and Co loss is easy to cause. The growth of Co crystallites may result during calcination, the larger the crystallites, the greater the activity. So use CH 3 The Br modification can split large particles and reduce the particle diameter. Meanwhile, the dispersity of Co elements is improved, and the Co elements can be uniformly loaded on the carbon nano tube.
(4) The catalyst has the advantages of short preparation time, simple preparation process, high practicability, difficult dispersion of the catalyst in water, convenient collection and high pollutant COD degradation efficiency of over 90 percent.
Drawings
FIG. 1 is a diagram of a CH provided by an embodiment of the present invention 3 Br@CNT-Co/N preparation flow chart.
FIG. 2 is a diagram of a CH provided by an embodiment of the present invention 3 XRD pattern of carbon nanotubes of Br@CNT-Co/N.
FIG. 3 is a diagram of a CH provided by an embodiment of the present invention 3 SEM image of Br@CNT-Co/N carbon nanotubes.
FIG. 4 is a diagram of a CH provided by an embodiment of the present invention 3 And Br@CNT-Co/N is used for treating a coal chemical wastewater data graph.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Aiming at the problems existing in the prior art, the invention provides a preparation method and application of a composite carrier ozone catalyst, and the invention is described in detail below with reference to the accompanying drawings.
The preparation method of the composite catalyst comprises the following steps:
s101, placing an industrial-grade carbon nano tube in concentrated nitric acid, heating, stirring, filtering and cleaning, and finally freeze-drying the cleaned carbon nano tube to obtain a pretreated carbon nano tube (CNT-P);
s102, co (NO) 3 ) 2 ·6H 2 Mixing O, citric acid and absolute ethyl alcohol, then placing the CNT-P into the mixed solution for water bath evaporation, continuously introducing nitrogen and calcining at high temperature, and finally obtaining the Co-loaded carbon nanotube (CNT-Co);
s103, carrying out N doping and CH on the carbon nanotube (CNT-Co) loaded with Co 3 Br modification to obtain bromomethane modified Co/N loaded carbon nanotube (CH) 3 Br@CNT-Co/N)。
Example 1
(1) Heating industrial-grade carbon nanotubes to 150 ℃ in concentrated nitric acid, magnetically stirring at constant temperature for 14 hours, filtering the mixed solution through a 0.22 mu m filter membrane, cleaning the carbon nanotubes to the surface pH value of 6.2, and finally freeze-drying the cleaned carbon nanotubes to obtain pretreated carbon nanotubes (CNT-P);
(2) Co (NO) 3 ) 2 ·6H 2 Mixing O and citric acid with absolute ethyl alcohol, then placing CNT-P into the mixed solution, evaporating in water bath at 98 deg.C, then placing the mixture into a tube furnace, calcining for eight hours under nitrogen atmosphere, calcining at 610 deg.C and nitrogen flow rate of 100ml/min to obtain Co/N-loaded carbon nano tube (CNT-Co), stopping N when the temperature is reduced to below 200 deg.C 2 Introducing ammonia gas, reacting for 60min at flow rate of 80ml/min, and introducing CH 3 Br gas with the flow rate of 80ml/min is reacted for 30min to obtain bromomethane modified Co/N loaded carbon nano tube (CH) 3 Br@CNT-Co/N)；
(3) CH to be prepared 3 Br@CNT-Co/N is used for catalytic oxidation of coal chemical wastewater, and compared with a commercially available catalyst, and SEM, XRD and treatment effects of the catalyst are shown in figures 2, 3 (A, B) and 4.
Example 2
(1) Heating industrial-grade carbon nanotubes to 130 ℃ in concentrated nitric acid, magnetically stirring at constant temperature for 14h, filtering the mixed solution with a 0.22 mu m filter membrane, cleaning the carbon nanotubes to the surface pH value of 6, and finally freeze-drying the cleaned carbon nanotubes to obtain pretreated carbon nanotubes (CNT-P);
(2) Co (NO) 3 ) 2 ·6H 2 Mixing O and citric acid with absolute ethyl alcohol, then placing CNT-P into the mixed solution, evaporating in water bath at 90 ℃, then placing the mixture into a tube furnace, calcining for eight hours under nitrogen atmosphere, wherein the calcining temperature is 550 ℃, the nitrogen flow is 80ml/min, finally obtaining Co-loaded carbon nano tube (CNT-Co), and stopping N when the temperature is reduced to below 200 DEG C 2 Introducing ammonia gas, reacting for 60min at a flow rate of 60ml/min, and introducing CH 3 Br gas with the flow rate of 60ml/min is reacted for 30min to obtain bromomethane modified Co/N loaded carbon nano tube (CH) 3 Br@CNT-Co/N)；
(3) The prepared CNT-Co/N is used for catalyzing and oxidizing coal chemical wastewater, and compared with a commercially available catalyst, and SEM, XRD and treatment effects of the catalyst are shown in figures 2, 3 (C, D) and 4.
Main scheme and effect description section:
(1) Heating, stirring, filtering and cleaning industrial-grade carbon nanotubes in concentrated nitric acid, and finally freeze-drying the cleaned carbon nanotubes to obtain pretreated carbon nanotubes (CNT-P);
(2) Co (NO) 3 ) 2 ·6H 2 Mixing O, citric acid and absolute ethyl alcohol, then placing the CNT-P into the mixed solution for water bath evaporation, continuously introducing nitrogen and calcining at high temperature, and finally obtaining the Co-loaded carbon nanotube (CNT-Co);
(3) Co/N-loaded carbon nanotubes (CNT-Co) are N-doped and CH-doped 3 Br modification to obtain bromomethane modified Co/N loaded carbon nanotube (CH) 3 Br@CNT-Co/N)。
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the invention is not limited thereto, but any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present invention will be apparent to those skilled in the art within the scope of the present invention.
Claims (8)
1. A preparation method and application of a composite carrier ozone catalyst are characterized in that the preparation steps of the catalyst are as follows:
(1) Heating, stirring, filtering and cleaning the industrial-grade carbon nano tube in concentrated nitric acid, and finally freeze-drying the treated carbon nano tube to obtain a pretreated carbon nano tube (CNT-P);
(2) Co (NO) 3 ) 2 ·6H 2 Mixing O, citric acid and absolute ethyl alcohol, then placing the CNT-P into a mixed solution for water bath evaporation, and then calcining at high temperature in a nitrogen atmosphere to finally obtain a Co-loaded carbon nanotube (CNT-Co);
(3) Co-supported carbon nanotubes (CNT-Co) are N-doped and CH-doped 3 Br modification to obtain bromomethane modified Co/N loaded carbon nanotube (CH) 3 Br@CNT-Co/N)。
2. The preparation method and the application of the composite carrier ozone catalyst according to claim 1 comprise the following steps of:
(1) Placing the industrial-grade carbon nano tube in concentrated nitric acid, and magnetically stirring at constant temperature for 14h;
(2) Filtering the mixed solution with a 0.22um filter membrane, cleaning the carbon nano tube and adjusting the pH value to 6;
(3) Finally, freeze-drying the cleaned carbon nanotubes to obtain the pretreated carbon nanotubes (CNT-P).
3. Root of Chinese characterThe Co/N-supported carbon nanotubes modified with bromomethane according to claim 1 (CH 3 br@cnt-Co/N) preparation steps are:
(1) Co (NO) 3 ) 2 ·6H 2 Mixing O and citric acid according to a mass ratio of 1:2, and adding absolute ethyl alcohol, wherein the mass ratio of the mixture to the absolute ethyl alcohol is 1:10;
(2) Mixing the pretreated carbon nano tube and the mixed solution according to the mass ratio of 1:5, and heating in a water bath at 90 ℃ to obtain a treated carbon nano tube mixture;
(3) Calcining the treated carbon nanotube mixture at a high temperature at 600 ℃ under the nitrogen flow of 60ml/min to finally obtain a Co-loaded carbon nanotube (CNT-Co);
(4) Stopping N when the temperature is reduced to below 200 DEG C 2 Introducing ammonia gas, reacting for 60min, and introducing CH 3 Br gas, reacting for 30min to obtain bromomethane modified Co/N loaded carbon nanotube (CH) 3 Br@CNT-Co/N)。
4. According to claim 1, the flow rate of nitrogen is 60ml/min-100ml/min, the flow rate of ammonia is 60ml/min-80ml/min, CH 3 The Br flow is 60ml/min-80ml/min.
5. The water bath evaporation temperature of 90-95 ℃ according to claim 1; the high-temperature calcination temperature is 550-650 ℃.
6. The carbon nanotube heating temperature of 125-135 ℃ according to claim 2; the pH value of the carbon nano tube is regulated to be 6.0-6.5.
7. A preparation method and application of a composite carrier ozone catalyst according to claims 1-8.
8. The catalytic ozonation assay of claims 1-8, wherein: 1-2g of CH 3 The Br@CNT-Co/N catalyst has an ozone flux of 2-3mg/min, and is used for treating coal chemical wastewater, and the reaction time is 30min.
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