CN115025808B - Activated carbon loaded TiO 2 Rapid preparation method of graphene molecular sieve and application of graphene molecular sieve in trifluoroacetic acid degradation - Google Patents
Activated carbon loaded TiO 2 Rapid preparation method of graphene molecular sieve and application of graphene molecular sieve in trifluoroacetic acid degradation Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 155
- DTQVDTLACAAQTR-UHFFFAOYSA-N Trifluoroacetic acid Chemical compound OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 61
- 239000002808 molecular sieve Substances 0.000 title claims abstract description 51
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 230000015556 catabolic process Effects 0.000 title claims abstract description 41
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 229910010413 TiO 2 Inorganic materials 0.000 title claims abstract description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000005406 washing Methods 0.000 claims abstract description 3
- 239000003054 catalyst Substances 0.000 claims description 28
- 239000010902 straw Substances 0.000 claims description 21
- 241000209219 Hordeum Species 0.000 claims description 12
- 235000007340 Hordeum vulgare Nutrition 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 11
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 4
- 229910052680 mordenite Inorganic materials 0.000 claims description 2
- 238000001228 spectrum Methods 0.000 claims description 2
- 235000013339 cereals Nutrition 0.000 claims 1
- 239000002356 single layer Substances 0.000 claims 1
- 239000002245 particle Substances 0.000 description 7
- 239000011259 mixed solution Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001291 vacuum drying Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000007146 photocatalysis Methods 0.000 description 2
- 230000001699 photocatalysis Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000000967 suction filtration Methods 0.000 description 2
- 239000011206 ternary composite Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 230000029936 alkylation Effects 0.000 description 1
- 238000005804 alkylation reaction Methods 0.000 description 1
- 238000005899 aromatization reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004523 catalytic cracking Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000007323 disproportionation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000006317 isomerization reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
-
- 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
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
-
- 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
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/18—Carbon
-
- B01J35/39—
-
- B01J35/618—
-
- 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
- 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
- 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
- C02F2101/36—Organic compounds containing halogen
-
- 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
- C02F2305/10—Photocatalysts
Abstract
The invention relates to the technical field of molecular sieves, and provides an activated carbon loaded TiO 2 A rapid preparation method of a graphene molecular sieve and application of the graphene molecular sieve in trifluoroacetic acid degradation, wherein the preparation method comprises the following steps: s1, mixing and stirring titanium dioxide, activated carbon and water to obtain activated carbon-loaded titanium dioxide; s2, dispersing 5-30wt% of graphene and 20-85wt% of molecular sieve in water, adding 5-20wt% of sodium tripolyphosphate, uniformly mixing, and adding 5-35wt% of activated carbon loaded titanium dioxide; s3, centrifuging, washing and drying to obtain the product. Through the technical scheme, the problems of complex preparation process, high cost and single function of the graphene active carbon molecular sieve in the prior art are solved.
Description
Technical Field
The invention relates to molecular sieve technologyThe technical field, in particular to an active carbon loaded TiO 2 A rapid preparation method of graphene molecular sieve and application thereof in trifluoroacetic acid degradation.
Background
The common mode of crop straw is incineration, and the straw is directly combusted in farmland, so that the crop straw is a highly seasonal atmospheric pollution source. Because the temperature of the straw burning in the farmland is low, a large amount of particles are released, and each time 1 ton of straw is burned in the farmland, hundreds of grams to several kilograms of particles, even more than 10 kilograms of particles are released. Hundreds of millions of tons of straw are produced annually, 50% of straw is burned in farmland, and more than hundreds of thousands of tons of particulate matters are produced. Because the combustion time is mainly concentrated in a short time of only a few weeks after the summer and autumn harvest, if the weather condition is bad, the temperature of the flue gas generated by straw combustion is low, and more particulate matters in the flue gas can cause serious air pollution in a short time. The highland barley straw is prepared into graphene and active carbon with low energy consumption, which is a treatment mode of changing waste into valuable and achieving two purposes at one time.
With the continuous increase of the population of the world and the continuous aggravation of the high standard requirements of people on living environment and the air pollution condition. The method for purifying the air is actively searched, and based on the advantages of large specific surface area, high strength, good chemical stability, strong modifiable property, good conductivity and the like, the graphene can not only well adsorb organic matters in the air, but also be used as a catalyst carrier to catalyze the degradation of air pollutants, so that the graphene is widely researched as an air purifying material, but the existing equipment is single in function, high in energy consumption and high in cost input, and is unfavorable for environmental protection in the production of the graphene active carbon.
Disclosure of Invention
The invention provides an active carbon loaded TiO 2 The rapid preparation method of the graphene molecular sieve and the application of the graphene molecular sieve in trifluoroacetic acid degradation solve the problems of complex preparation process, high cost and single function of the graphene active carbon molecular sieve in the related technology.
The technical scheme of the invention is as follows:
a kind of living oneCarbon-loaded TiO 2 The rapid preparation method of the graphene molecular sieve comprises the following steps:
s1, mixing and stirring titanium dioxide, activated carbon and water to obtain activated carbon-loaded titanium dioxide;
s2, dispersing 5-30wt% of graphene and 20-85wt% of molecular sieve in water, adding 5-20wt% of sodium tripolyphosphate, uniformly mixing, and adding 5-35wt% of activated carbon loaded titanium dioxide;
s3, centrifuging, washing and drying to obtain the product.
As a further technical scheme, in the step S1, the activated carbon is highland barley straw cut and crushed, and the specific surface area 1900m prepared after microwave heating 2 Activated carbon/g above, microwave heating time is 15-30 minutes, and microwave power is 350 watts.
As a further technical scheme, in the step S1, the ratio of titanium dioxide, activated carbon to water is 1:1-2:15-20.
As a further technical scheme, in the step S1, the stirring temperature is 28-32 ℃, the stirring time is 6-10h, and the rotating speed is 200r/min.
As a further technical scheme, in the step S1, the titanium dioxide is water-based self-dispersion full-spectrum titanium dioxide with the particle size of 2-10nm.
As a further technical scheme, in the step S2, the graphene is prepared by sintering highland barley straw, a copper melting catalyst is adopted during sintering, and the temperature is set to be 1000-1200 ℃.
As a further technical scheme, in the step S2, the graphene is one of a first layer of graphene, a second layer of graphene, a third layer of graphene, a plurality of layers of graphene or graphene oxide.
As a further technical scheme, sodium tripolyphosphate is added and stirred for 1-6h, preferably 4-6h.
As a further technical scheme, in step S2, the addition amounts of the raw materials are respectively as follows: 15-20wt% of graphene, 50-55wt% of molecular sieve, 5-10wt% of sodium tripolyphosphate and 10-20wt% of activated carbon loaded titanium dioxide.
As a further technical scheme, in the step S3, the molecular sieve is one of ZSM-5, ZSM-11, SBA-15, MCM and mordenite.
As a further technical scheme, in the step S3, the molecular sieve is ZSM-5, the pore diameter of the micropores is 0.7+/-0.1 nm, and the mesopores with the pore diameter ratio of more than 10 percent are formed.
As a further technical scheme, in the step S3, the centrifugal speed is 6000rpm, the centrifugal time is 10min, the deionized water is filtered for 3 times, and the vacuum drying oven is dried for 2h at 60 ℃.
The invention also provides the activated carbon loaded TiO according to the method 2 The molecular sieve prepared by the rapid preparation method of the graphene molecular sieve is applied to trifluoroacetic acid degradation or catalyst.
The beneficial effects of the invention are as follows:
1. the invention prepares a graphene/molecular sieve/active carbide composite catalyst by using active carbon, graphene, titanium dioxide and molecular sieve, and the invention uses the active carbon to load the titanium dioxide to participate in photocatalysis so as to catalyze organic pollutants adsorbed by the active carbon into CO 2 And H 2 O, achieve the purpose of on-line adsorption and degradation.
2. According to the invention, graphene is introduced into the traditional molecular sieve field, and the ternary composite material of graphene, molecular sieve and titanium dioxide composite active carbon is creatively prepared, so that the ternary composite material has a new structure, the pore diameter is changed, the microporous and mesoporous microstructures are provided, the synergistic catalysis performance of the molecular sieve, graphene and photocatalysis is provided, and the performance of catalytic molecular alkylation, isomerization, aromatization, disproportionation, catalytic cracking or condensation reaction is provided. And graphene is added into the molecular sieve, so that the specific surface area of the activated carbon is increased, the effect of exponentially increasing the adsorption performance is achieved, and the degradation effect on trifluoroacetic acid is promoted.
3. The preparation method disclosed by the invention has the advantages of simple process and low production cost, the highland barley straw is recycled, waste is changed into valuable, the production cost of graphene is reduced, the time consumption of activated carbon production is short, the production of functional graphene activated carbon is increased, the application space of graphene in the field of air purification is expanded, the preparation method can be particularly applied to the degradation of trifluoroacetic acid, the degradation rate can be improved to about 45% within 5-10 hours, and the degradation rate is far higher than that of conventional degradation medium activated carbon. The functional graphene activated carbon widens the application range of graphene and activated carbon, and can reduce the pollution of treated straws to the environment.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is an electron microscope photograph of activated carbon-supported titanium dioxide prepared by the invention;
FIG. 2 is a TiO 2-supported active carbon obtained in example 3 of the present invention 2 Electron microscope pictures of graphene molecular sieves;
FIG. 3 is a trifluoroacetic acid degradation curve of example 1;
FIG. 4 is a trifluoroacetic acid degradation curve of example 2;
FIG. 5 is a trifluoroacetic acid degradation curve of example 3;
fig. 6 is a trifluoroacetic acid degradation curve of the activated carbon.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
(1) Preparing active carbon: highland barley straw is cut and crushed, microwave power is 350 watts, and the specific surface area is 1900m after 20 minutes of microwave heating 2 Activated carbon above/g.
(2) Preparing graphene: the highland barley straw is sintered at 1100 ℃ in a copper melting catalyst.
(3) Preparing activated carbon-loaded titanium dioxide: placing water-based self-dispersion titanium dioxide with particle size of 2-10nm and active carbon into water, and stirring at rotation speed of 200r/min and at 30 ℃ for 8h.
(4) Dispersing 15wt% of graphene and 55wt% of ZSM-11 molecular sieve in water by ultrasonic, adding 10wt% of sodium tripolyphosphate, stirring for 1h to obtain a mixed solution, adding 20wt% of activated carbon loaded titanium dioxide into the mixed solution, uniformly mixing, centrifuging at 6000rpm for 10min, filtering with deionized water for 3 times, and drying in a vacuum drying oven at 60 ℃ for 2h to obtain the catalyst.
Example 2
(1) Preparing active carbon: highland barley straw is cut and crushed, microwave power is 350 watts, and the specific surface area is 1900m after 20 minutes of microwave heating 2 Activated carbon above/g.
(2) Preparing graphene: the highland barley straw is sintered at 1100 ℃ in a copper melting catalyst.
(3) Preparing activated carbon-loaded titanium dioxide: placing water-based self-dispersion titanium dioxide with particle size of 2-10nm and active carbon into water, and stirring at rotation speed of 200r/min and at 30 ℃ for 8h.
(4) Dispersing 20wt% of graphene and 55wt% of molecular sieve in water by ultrasonic, adding 10wt% of sodium tripolyphosphate, stirring for 4 hours to obtain a mixed solution, adding 15wt% of active carbon-loaded titanium dioxide into the mixed solution, uniformly mixing, centrifuging at 6000rpm for 10 minutes, carrying out suction filtration on deionized water for 3 times, and drying at 60 ℃ for 2 hours in a vacuum drying oven to obtain the catalyst, wherein the molecular sieve is ZSM-5, and the micropore size of the molecular sieve is enlarged to 0.7+/-0.1 nm and has mesopores with a pore size ratio greater than 10%.
Example 3
(1) Preparing active carbon: highland barley straw is cut and crushed, microwave power is 350 watts, and the specific surface area is 1900m after 20 minutes of microwave heating 2 Activated carbon above/g.
(2) Preparing graphene: the highland barley straw is sintered at 1100 ℃ in a copper melting catalyst.
(3) Preparing activated carbon-loaded titanium dioxide: placing water-based self-dispersion titanium dioxide with particle size of 2-10nm and active carbon into water, and stirring at rotation speed of 200r/min and at 30 ℃ for 8h.
(4) And (3) ultrasonically dispersing 25wt% of graphene and 55wt% of molecular sieve in water, adding 10wt% of sodium tripolyphosphate, stirring for 6 hours to obtain a mixed solution, adding 10wt% of active carbon-loaded titanium dioxide into the mixed solution, uniformly mixing, centrifuging at 6000rpm for 10 minutes, performing suction filtration on deionized water for 3 times, and drying in a vacuum drying oven at 60 ℃ for 2 hours to obtain an electron microscope photograph of the catalyst shown in figure 2. Wherein the molecular sieve is ZSM-5, the micropore diameter of the molecular sieve is enlarged to 0.7+/-0.1 nm, and the molecular sieve has mesopores with a pore diameter ratio of more than 10 percent.
The molecular sieve catalysts prepared in examples 1-3 were used to degrade trifluoroacetic acid. Preparing a trifluoroacetic acid solution with the mass fraction of 25%, taking 100g, putting 5g of the prepared molecular sieve catalyst, irradiating with a 250w high-pressure mercury lamp, and replacing the molecular sieve catalyst with active carbon by a control group by adopting the same experimental method to obtain a trifluoroacetic acid degradation curve.
Fig. 3 shows the degradation curve of trifluoroacetic acid of the catalyst in example 1, wherein the degradation rate of trifluoroacetic acid reaches a maximum value of 32.7% after 6 hours of reaction, and only 17.5% after 40 hours of reaction time with the extension of reaction time, and it can be seen from the graph that the degradation rate still tends to decrease after the time is extended to 40 hours. FIG. 4 is a graph showing the degradation curve of trifluoroacetic acid of the catalyst in example 2, wherein the degradation rate of trifluoroacetic acid after 6 hours of reaction was 42.4%, the maximum was reached, the degradation rate was substantially decreased with the increase of the reaction time, and the degradation rate after 40 hours was 29.9%. FIG. 5 shows the trifluoroacetic acid degradation curve of the catalyst of example 3, wherein the degradation rate was 47.4% at maximum at 6 hours, and then the degradation rate was about 35% after starting to slowly decrease to 40 hours. Fig. 6 is a degradation curve of the activated carbon as a catalyst for degrading trifluoroacetic acid, from which it can be seen that the degradation rate of trifluoroacetic acid reaches a maximum of 15.2% after 3 hours of reaction, and then starts to decrease to 7.5% after 10 hours.
The graphene/molecular sieve/active carbide composite catalyst prepared by the preparation method can be applied to degradation of trifluoroacetic acid, and the degradation effect on the trifluoroacetic acid is far higher than that of active carbon. In addition, the invention discovers that when the adding amount of the activated carbon loaded titanium dioxide is larger than the adding amount of the graphene, the degradation effect on trifluoroacetic acid is best.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. Activated carbon loaded TiO 2 The application of the graphene molecular sieve composite catalyst in trifluoroacetic acid degradation is characterized in that the preparation method of the catalyst comprises the following steps:
s1, mixing and stirring titanium dioxide, activated carbon and water to obtain activated carbon-loaded titanium dioxide;
the ratio of the titanium dioxide to the active carbon to the water is 1:1-2:15-20;
s2, 20-25 wt% of graphene and 55wt% of molecular sieve are dispersed in water, 10wt% of sodium tripolyphosphate is added, and 10-15 wt% of activated carbon loaded titanium dioxide is added after uniform mixing;
s3, centrifuging, washing and drying to obtain the product.
2. Activated carbon-supported TiO according to claim 1 2 The application of the graphene molecular sieve composite catalyst in trifluoroacetic acid degradation is characterized in that in the step S1, the activated carbon is the specific surface area 1900m prepared by cutting and crushing highland barley straws and heating by microwaves 2 Activated carbon/g above, microwave heating time is 15-30 minutes, and microwave power is 350 watts.
3. Activated carbon-supported TiO according to claim 1 2 The application of the graphene molecular sieve composite catalyst in trifluoroacetic acid degradation is characterized in that in the step S1, the stirring temperature is 28-32 ℃, the stirring time is 6-10h, and the rotating speed is 200r/min.
4. Activated carbon-supported TiO according to claim 1 2 The application of the graphene molecular sieve composite catalyst in trifluoroacetic acid degradation is characterized in that in the step S1, the titanium dioxide is water-based self-dispersion full-spectrum titanium dioxide,the grain diameter is 2-10nm.
5. Activated carbon-supported TiO according to claim 1 2 The application of the graphene molecular sieve composite catalyst in trifluoroacetic acid degradation is characterized in that in the step S2, graphene is prepared by sintering highland barley straws, a copper melting catalyst is adopted during sintering, and the temperature is set to be 1000-1200 ℃.
6. Activated carbon-supported TiO according to claim 1 2 The application of the graphene molecular sieve composite catalyst in trifluoroacetic acid degradation is characterized in that in the step S2, the graphene is one of monolayer graphene, multilayer graphene or graphene oxide.
7. Activated carbon-supported TiO according to claim 1 2 The application of the graphene molecular sieve composite catalyst in trifluoroacetic acid degradation is characterized in that in the step S3, the molecular sieve is one of ZSM-5, ZSM-11, SBA-15, MCM and mordenite.
8. Activated carbon-supported TiO according to claim 1 2 The application of the graphene molecular sieve composite catalyst in trifluoroacetic acid degradation is characterized in that in the step S3, the molecular sieve is ZSM-5, the pore diameter of the micropores is 0.7+/-0.1 nm, and the micropores have the pore diameter ratio of more than 10%.
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