CN115025808A - Active carbon loaded TiO 2 Rapid preparation method of graphene molecular sieve and application of graphene molecular sieve in trifluoroacetic acid degradation - Google Patents
Active 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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- CN115025808A CN115025808A CN202210474574.7A CN202210474574A CN115025808A CN 115025808 A CN115025808 A CN 115025808A CN 202210474574 A CN202210474574 A CN 202210474574A CN 115025808 A CN115025808 A CN 115025808A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 178
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 64
- DTQVDTLACAAQTR-UHFFFAOYSA-N Trifluoroacetic acid Chemical compound OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 239000002808 molecular sieve Substances 0.000 title claims abstract description 52
- 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 52
- 230000015556 catabolic process Effects 0.000 title claims abstract description 34
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 12
- 229910010413 TiO 2 Inorganic materials 0.000 title claims abstract description 8
- 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 21
- 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
- 239000010902 straw Substances 0.000 claims description 25
- 239000003054 catalyst Substances 0.000 claims description 21
- 241000209219 Hordeum Species 0.000 claims description 17
- 235000007340 Hordeum vulgare Nutrition 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 10
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 239000011148 porous material Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 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
- 238000005520 cutting process Methods 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
- 239000006185 dispersion Substances 0.000 claims description 2
- 229910052680 mordenite Inorganic materials 0.000 claims description 2
- 238000001228 spectrum Methods 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000001291 vacuum drying Methods 0.000 description 4
- 238000004887 air purification Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000000967 suction filtration Methods 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
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000003306 harvesting Methods 0.000 description 2
- 230000001699 photocatalysis Effects 0.000 description 2
- 238000007146 photocatalysis Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000001179 sorption measurement Methods 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
- 230000029936 alkylation Effects 0.000 description 1
- 238000005804 alkylation reaction Methods 0.000 description 1
- 238000005899 aromatization reaction Methods 0.000 description 1
- 238000004523 catalytic cracking Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007323 disproportionation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 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
- 239000002356 single layer Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000011206 ternary composite Substances 0.000 description 1
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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—
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- 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 active carbon loaded TiO 2 Rapid preparation method of graphene molecular sieve and application of graphene molecular sieve in trifluoroacetic acid degradation, whereinThe 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 5-30 wt% of graphene and 20-85 wt% of molecular sieve in water, adding 5-20 wt% of sodium tripolyphosphate, uniformly mixing, and adding 5-35 wt% 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 activated carbon molecular sieve in the prior art are solved.
Description
Technical Field
The invention relates to the technical field of molecular sieves, in particular to 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.
Background
The common mode of crop straw is incineration, and the straw is directly combusted in farmland, which is a very seasonal atmospheric pollution source. Because the burning temperature of the straws in the farmland is lower, a large amount of particles are released, and every 1 ton of straws burned in the farmland can release hundreds of grams to several kilograms of particles or even more than 10 kilograms of particles. Hundreds of millions of tons of straws are produced every year in China, and more than tens of thousands of tons of particles are produced when 50 percent of straws are burnt in farmlands. Because the burning time is mainly concentrated in the short time of only a few weeks after summer harvest and autumn harvest, if the meteorological conditions are not good, the temperature of the flue gas generated by burning the straws is low, and more particles in the flue gas can cause serious air pollution in a short time. The highland barley straws are prepared into graphene and active carbon with low energy consumption, which is a processing mode of changing waste into valuable and killing two birds with one stone.
With the increasing number of the population in the world and the high standard requirement of people on living environment, the air pollution situation is increased. People are actively searching for an air purification method, based on the advantages of large specific surface area, high strength, good chemical stability, strong modifiability, good electrical conductivity and the like, graphene not only can well adsorb organic matters in air, but also can be used as a catalyst carrier to catalyze the degradation of air pollutants, so that the graphene is widely researched as an air purification treatment material, but the graphene activated carbon produced by the existing equipment has single function, high energy consumption, high cost input and is not beneficial to environmental protection.
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 activated carbon molecular sieve in the related technology.
The technical scheme of the invention is as follows:
active carbon 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 5-30 wt% of graphene and 20-85 wt% of molecular sieve in water, adding 5-20 wt% of sodium tripolyphosphate, uniformly mixing, and adding 5-35 wt% 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 prepared by cutting and crushing highland barley straws, and heating by microwave to obtain a specific surface area of 1900m 2 The microwave heating time is 15-30 minutes and the microwave power is 350 watts per gram of the activated carbon.
As a further technical solution, in the step S1, the ratio of titanium dioxide, activated carbon and 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 200 r/min.
As a further technical scheme, in the step S1, the titanium dioxide is aqueous self-dispersion full spectrum titanium dioxide, and the particle size is 2-10 nm.
As a further technical scheme, in the step S2, the graphene is prepared by sintering highland barley straws, and a copper melting catalyst is adopted during sintering, and the temperature is set to 1000-1200 ℃.
As a further technical solution, in the step S2, the graphene is one of a single-layer graphene, a double-layer graphene, a triple-layer graphene, a multi-layer graphene, or a graphene oxide.
As a further technical scheme, sodium tripolyphosphate is added and stirred for 1-6h, preferably 4-6 h.
As a further technical scheme, in step S2, the addition amounts of the raw materials are respectively: 15-20 wt% of graphene, 50-55 wt% of molecular sieve, 5-10 wt% of sodium tripolyphosphate and 10-20 wt% of active 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 have the pore diameter ratio of more than 10%.
As a further technical scheme, in the step S3, the centrifugal speed is 6000rpm, the centrifugal time is 10min, deionized water is filtered in a suction manner for 3 times, and the product is dried in a vacuum drying oven for 2 hours at the temperature of 60 ℃.
The invention also provides the active carbon supported TiO 2 Application of the molecular sieve prepared by the rapid preparation method of the graphene molecular sieve in degradation of trifluoroacetic acid or in a catalyst.
The invention has the beneficial effects that:
1. the graphene/molecular sieve/activated carbon composite catalyst is prepared by using activated carbon, graphene, titanium dioxide and a molecular sieve, and the activated carbon loaded titanium dioxide can participate in photocatalysis to photocatalyze organic pollutants adsorbed by the activated carbon into CO 2 And H 2 And O, achieving the purposes of online adsorption and degradation.
2. The invention introduces graphene in the field of traditional molecular sieves, creatively prepares the ternary composite material of graphene, molecular sieve and titanium dioxide composite activated carbon, has a new structure, changes the aperture, has a micropore and mesopore microstructure, has the synergistic catalytic performance of the molecular sieve, the graphene and photocatalysis, and has the performance of catalyzing molecular alkylation, isomerization, aromatization, disproportionation, catalytic cracking or condensation reaction. And the 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 is simple in process and low in production cost, the highland barley straws are recycled, waste is turned into wealth, the production cost of graphene is reduced, the production time of active carbon is short, the production of functional graphene active 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, and the degradation rate can be improved to about 45% within 5-10h and far exceeds that of the conventional degradation medium active carbon. The functional graphene activated carbon widens the application range of graphene and activated carbon, and can reduce the pollution of the treated straw to the environment.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is an electron microscope photograph of the activated carbon loaded titanium dioxide prepared by the present invention;
FIG. 2 shows the TiO supported on activated carbon obtained in example 3 of the present invention 2 Electron microscope photographs of graphene molecular sieves;
FIG. 3 is the trifluoroacetic acid degradation curve of example 1;
FIG. 4 is the trifluoroacetic acid degradation curve of example 2;
FIG. 5 is the trifluoroacetic acid degradation curve of example 3;
FIG. 6 is a trifluoroacetic acid degradation curve of activated carbon.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive step, are intended to be within the scope of the present invention.
Example 1
(1) Preparing activated carbon: cutting and crushing highland barley straws, heating the highland barley straws at the microwave power of 350 watts for 20 minutes to obtain the highland barley straws with the specific surface area of 1900m 2 More than g of activated carbon.
(2) Preparing graphene: the highland barley straw is sintered at 1100 ℃ in a copper melting catalyst.
(3) Preparing activated carbon loaded titanium dioxide: placing the water-based self-dispersible titanium dioxide with the particle size of 2-10nm and the activated carbon into water, and stirring at the rotation speed of 200r/min and the temperature of 30 ℃ for 8 h.
(4) Ultrasonically dispersing 15 wt% of graphene and 55 wt% of ZSM-11 molecular sieve in water, then adding 10 wt% of sodium tripolyphosphate, stirring for 1h to obtain a mixed solution, adding 20 wt% of activated carbon-loaded titanium dioxide into the mixed solution, uniformly mixing, centrifuging at a rotating speed of 6000rpm for 10min, carrying out suction filtration on deionized water for 3 times, and drying in a vacuum drying oven at 60 ℃ for 2h to obtain the catalyst.
Example 2
(1) Preparing activated carbon: cutting and crushing highland barley straws, heating the highland barley straws at the microwave power of 350 watts for 20 minutes to obtain the highland barley straws with the specific surface area of 1900m 2 Per gram of activated carbon.
(2) Preparing graphene: the highland barley straw is sintered at 1100 ℃ in a copper melting catalyst.
(3) Preparing activated carbon loaded titanium dioxide: placing the water-based self-dispersible titanium dioxide with the particle size of 2-10nm and the activated carbon into water, and stirring for 8 hours at the rotation speed of 200r/min and the temperature of 30 ℃.
(4) Ultrasonically dispersing 20 wt% of graphene and 55 wt% of molecular sieve in water, adding 10 wt% of sodium tripolyphosphate, stirring for 4 hours to obtain a mixed solution, adding 15 wt% of activated carbon-loaded titanium dioxide into the mixed solution, uniformly mixing, centrifuging at a rotating speed of 6000rpm for 10min, carrying out suction filtration on deionized water for 3 times, and drying in a vacuum drying oven at 60 ℃ for 2 hours to obtain the catalyst, wherein the molecular sieve is ZSM-5, the pore diameter of micropores of the molecular sieve is enlarged to 0.7 +/-0.1 nm, and the mesopore has a pore diameter ratio of more than 10%.
Example 3
(1) Preparing activated carbon: cutting and crushing highland barley straw, heating for 20 minutes under the microwave power of 350 watts to obtain the specific surface area of 1900m 2 Per gram of activated carbon.
(2) Preparing graphene: the highland barley straw is sintered at 1100 ℃ in a copper melting catalyst.
(3) Preparing activated carbon loaded titanium dioxide: placing the water-based self-dispersible titanium dioxide with the particle size of 2-10nm and the activated carbon into water, and stirring at the rotation speed of 200r/min and the temperature of 30 ℃ for 8 h.
(4) Ultrasonically dispersing 25 wt% of graphene and 55 wt% of molecular sieve in water, adding 10 wt% of sodium tripolyphosphate, stirring for 6 hours to obtain a mixed solution, adding 10 wt% of activated carbon-loaded titanium dioxide into the mixed solution, uniformly mixing, centrifuging at a rotating speed of 6000rpm for 10min, carrying out suction filtration on deionized water for 3 times, and drying in a vacuum drying oven at 60 ℃ for 2 hours to obtain the catalyst, wherein an electron microscope photo of the obtained catalyst is shown in figure 2. Wherein the molecular sieve is ZSM-5, and has micropore diameter enlarged to 0.7 + -0.1 nm and mesopore with pore diameter ratio of more than 10%.
The molecular sieve catalysts prepared in examples 1-3 were used for the degradation of trifluoroacetic acid. Preparing 25% trifluoroacetic acid solution, taking 100g, putting 5g of the prepared molecular sieve catalyst, irradiating by a high-pressure mercury lamp of 250w, and replacing the molecular sieve catalyst with activated carbon by adopting the same experimental method in a control group to obtain a trifluoroacetic acid degradation curve.
FIG. 3 is a trifluoroacetic acid degradation curve of the catalyst of example 1, wherein after 6 hours of reaction, the degradation rate of trifluoroacetic acid reached a maximum of 32.7%, and with the extension of reaction time, after 40 hours of reaction, the degradation rate was only 17.5%, and it can be seen from the graph that the degradation rate still showed a downward trend after the time extended to 40 hours. FIG. 4 is a trifluoroacetic acid degradation curve of the catalyst of example 2, wherein the degradation rate of trifluoroacetic acid after 6 hours of reaction reaches 42.4% and reaches the maximum, and the degradation rate shows a substantially decreasing trend with the increase of reaction time, and the degradation rate at 40 hours is 29.9%. FIG. 5 is a trifluoroacetic acid degradation curve of the catalyst of example 3, showing a maximum degradation rate of 47.4% at 6 hours of reaction, followed by a slow decrease, and showing a degradation rate of about 35% after 40 hours. FIG. 6 is a degradation curve of trifluoroacetic acid by using activated carbon as a catalyst, and it can be seen from the graph that the degradation rate of trifluoroacetic acid reaches a maximum of 15.2% after 3h of reaction and then starts to decrease, and the degradation rate of trifluoroacetic acid is 7.5% after 10 h.
The graphene/molecular sieve/activated carbon composite catalyst prepared by the preparation method can be applied to degrading trifluoroacetic acid, and the degrading effect of the trifluoroacetic acid is far higher than that of activated carbon. In addition, the invention finds that when the addition amount of the titanium dioxide loaded on the activated carbon is larger than that of the graphene, the degradation effect on the trifluoroacetic acid is the best.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. Active carbon loaded TiO 2 The rapid preparation method of the graphene molecular sieve is characterized by comprising the following steps:
s1, mixing and stirring titanium dioxide, activated carbon and water to obtain activated carbon-loaded titanium dioxide;
s2, dispersing 5-30 wt% of graphene and 20-85 wt% of molecular sieve in water, adding 5-20 wt% of sodium tripolyphosphate, uniformly mixing, and adding 5-35 wt% of activated carbon-loaded titanium dioxide;
s3, centrifuging, washing and drying to obtain the product.
2. The activated carbon-supported TiO according to claim 1 2 The method for rapidly preparing the graphene molecular sieve is characterized in that in the step S1, the activated carbon is prepared by cutting and crushing highland barley straws, and heating the highland barley straws by microwaves to obtain a specific surface area of 1900m 2 Activated carbon of more than g, during microwave heatingThe time is 15-30 minutes, and the microwave power is 350 watts.
3. The activated carbon-supported TiO according to claim 1 2 The method for rapidly preparing the graphene molecular sieve is characterized in that in the step S1, the ratio of titanium dioxide, activated carbon and water is 1: 1-2: 15-20.
4. The activated carbon-supported TiO according to claim 1 2 The method for rapidly preparing the graphene molecular sieve 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 200 r/min.
5. The activated carbon-supported TiO according to claim 1 2 The rapid preparation method of the graphene molecular sieve is characterized in that in the step S1, the titanium dioxide is aqueous self-dispersion full spectrum titanium dioxide with the particle size of 2-10 nm.
6. The activated carbon-supported TiO according to claim 1 2 The method for rapidly preparing the graphene molecular sieve is characterized in that in the step S2, the graphene is prepared by sintering highland barley straws, and a copper melting catalyst is adopted during sintering, wherein the temperature is set to be 1000-1200 ℃.
7. The activated carbon-supported TiO according to claim 1 2 The method for rapidly preparing the graphene molecular sieve is characterized in that in the step S2, the graphene is one of a layer of graphene, a layer of graphene or graphene oxide.
8. The activated carbon supported TiO of claim 1 2 The method for rapidly preparing the graphene molecular sieve is characterized in that in the step S3, the molecular sieve is one of ZSM-5, ZSM-11, SBA-15, MCM and mordenite.
9. The activated carbon-supported TiO according to claim 1 2 Graphene moleculeThe method for rapidly preparing the sieve 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 mesopores with the pore diameter ratio of more than 10 percent.
10. The activated carbon-supported TiO according to claim 1 2 Application of the molecular sieve prepared by the rapid preparation method of the graphene molecular sieve in degradation of trifluoroacetic acid or in a catalyst.
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