CN115957793A - Biochar-based catalyst and synthesis method and application thereof - Google Patents
Biochar-based catalyst and synthesis method and application thereof Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 48
- 238000001308 synthesis method Methods 0.000 title abstract description 12
- 239000010902 straw Substances 0.000 claims abstract description 73
- 241000209140 Triticum Species 0.000 claims abstract description 41
- 235000021307 Triticum Nutrition 0.000 claims abstract description 41
- 238000005406 washing Methods 0.000 claims abstract description 38
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 25
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000012855 volatile organic compound Substances 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 239000011261 inert gas Substances 0.000 claims abstract description 15
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000002253 acid Substances 0.000 claims abstract description 11
- 239000007809 chemical reaction catalyst Substances 0.000 claims abstract description 11
- 239000008367 deionised water Substances 0.000 claims abstract description 11
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 11
- 239000012299 nitrogen atmosphere Substances 0.000 claims abstract description 11
- 238000006479 redox reaction Methods 0.000 claims abstract description 11
- 150000003839 salts Chemical class 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 235000013339 cereals Nutrition 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 19
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 15
- 239000012298 atmosphere Substances 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- FYSNRJHAOHDILO-UHFFFAOYSA-N thionyl chloride Chemical compound ClS(Cl)=O FYSNRJHAOHDILO-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 238000003763 carbonization Methods 0.000 claims description 6
- 238000001179 sorption measurement Methods 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 5
- 244000269722 Thea sinensis Species 0.000 claims description 5
- 239000012300 argon atmosphere Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- GFAUNYMRSKVDJL-UHFFFAOYSA-N formyl chloride Chemical compound ClC=O GFAUNYMRSKVDJL-UHFFFAOYSA-N 0.000 claims description 5
- 238000007654 immersion Methods 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 239000011574 phosphorus Substances 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 239000011833 salt mixture Substances 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 5
- 238000003828 vacuum filtration Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- 240000000111 Saccharum officinarum Species 0.000 claims description 2
- 235000007201 Saccharum officinarum Nutrition 0.000 claims description 2
- 244000061456 Solanum tuberosum Species 0.000 claims description 2
- 235000002595 Solanum tuberosum Nutrition 0.000 claims description 2
- 240000008042 Zea mays Species 0.000 claims description 2
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 2
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 2
- 235000005822 corn Nutrition 0.000 claims description 2
- 235000012015 potatoes Nutrition 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- 230000002194 synthesizing effect Effects 0.000 claims 6
- 230000000694 effects Effects 0.000 abstract description 11
- 239000002184 metal Substances 0.000 abstract description 10
- 229910052751 metal Inorganic materials 0.000 abstract description 10
- 230000003197 catalytic effect Effects 0.000 abstract description 6
- 239000002245 particle Substances 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 6
- 239000002154 agricultural waste Substances 0.000 abstract description 5
- 239000003638 chemical reducing agent Substances 0.000 abstract description 5
- 229910021645 metal ion Inorganic materials 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- 238000000227 grinding Methods 0.000 abstract description 3
- 150000002739 metals Chemical class 0.000 abstract description 2
- JJWKPURADFRFRB-UHFFFAOYSA-N carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 description 20
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 17
- 239000007789 gas Substances 0.000 description 4
- 238000003915 air pollution Methods 0.000 description 3
- 238000009776 industrial production Methods 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- OBSZRRSYVTXPNB-UHFFFAOYSA-N tetraphosphorus Chemical compound P12P3P1P32 OBSZRRSYVTXPNB-UHFFFAOYSA-N 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 101710178035 Chorismate synthase 2 Proteins 0.000 description 1
- 101710152694 Cysteine synthase 2 Proteins 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000000746 purification Methods 0.000 description 1
- 239000005437 stratosphere Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000005436 troposphere Substances 0.000 description 1
Classifications
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention provides a biochar-based catalyst and a synthesis method and application thereof, and relates to the technical field of atmospheric pollution control. The biochar-based catalyst comprises biochar, the specific surface area of the biochar-based redox reaction catalyst is 360-800 m/g, and the first step is to perform acid washing pretreatment on wheat straws: treating wheat straws with a nitric acid solution with a certain concentration, and then cleaning with deionized water to obtain acid-washed pretreated wheat straws; and step two, grinding the wheat straws to obtain the wheat straw powder with the grain diameter of 40-200 meshes, and then using the wheat straw powder at the temperature of 600-800 ℃ under the nitrogen atmosphere. The high-activity biochar-based catalyst has the catalytic characteristics of multi-element metals, the mixture of carbon and salt presents high-efficiency performance for synchronously removing VOCs in an inert gas oxidation technical system, agricultural waste straws are used as biochar raw materials, and the straws are washed by hydrochloric acid to be reducing agents, so that various metal ions are converted into high-activity zero-valent metal catalyst particles.
Description
Technical Field
The invention relates to the technical field of air pollution control, in particular to a biochar-based catalyst and a synthesis method and application thereof.
Background
Carbonyl sulfide (COS) and carbon disulfide (CS 2) are widely present in atmospheric environments, and COS is the main sulfur-containing gas at the bottom of the troposphere and stratosphere, and their sources can be divided into natural and man-made sources. COS and CS2 are discharged to the atmosphere during industrial production and use, and can cause serious pollution and harm to the environment and human bodies. In the atmosphere, CS2 can also be catalytically oxidized to COS. Trace amounts of COS and CS2 in industrial production have a toxic effect on the catalyst, so that the catalytic effect and the service life thereof are seriously affected. Since COS and CS2 are slowly hydrolyzed to generate hydrogen sulfide (H2S), which corrodes production equipment, not only is a great economic loss brought to industrial production, but also equipment investment and product cost are increased. Meanwhile, the inhalation of COS and CS2 has great harm to the health of human bodies. COS and CS2 in the yellow phosphorus tail gas are coexisting typical organic sulfur gas, and the COS and the CS2 must be removed simultaneously on the premise of purification and resource utilization of the yellow phosphorus tail gas.
The invention provides a biochar-based catalyst and a synthesis method and application thereof, wherein the biochar-based catalyst is prepared by carbonizing straws as a raw material and washing with hydrochloric acid to adsorb, treat and utilize VOCs (volatile organic compounds), so that harmful pollutants are not generated, the problem of treatment of biomass wastes can be solved, and air pollution can be effectively prevented and treated.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a biochar-based catalyst and a synthesis method and application thereof, which solve the problems that straws are adopted for carbonization, and hydrochloric acid is adopted for washing to adsorb, treat and utilize VOCs, no harmful pollutants are generated, the problem of disposal of biomass wastes can be solved, and the problem of air pollution can be effectively prevented and treated.
In order to achieve the purpose, the invention is realized by the following technical scheme: a biochar-based catalyst and a synthesis method and application thereof comprise biochar, and the specific surface area of the biochar-based redox reaction catalyst is 360-800 m/g.
Preferably, the synthesis method of the biochar-based catalyst comprises the following steps;
firstly, carrying out acid washing pretreatment on wheat straws: treating wheat straws with a nitric acid solution with a certain concentration, and then cleaning with deionized water to obtain acid-washed pretreated wheat straws;
step two, grinding the wheat straws to obtain wheat straw powder with the grain diameter of 40-200 meshes, and roasting the wheat straw powder obtained in the step one for 1-3 hours at the temperature of 600-800 ℃ under the nitrogen atmosphere to obtain carbon powder;
and step three, adding biochar, thionyl chloride and dimethylformamide, uniformly mixing, then carrying out immersion reaction for 1-3 h at the temperature of 40-90 ℃ under the ultrasonic condition, washing by adopting anhydrous tetrahydrofuran, and carrying out vacuum filtration to obtain the formyl chloride tea stalk-based biochar adsorption catalyst.
Preferably, the first step comprises the following steps of drying the cleaned straws at 105 ℃ for 12 hours, crushing the straws by a grinder, and sieving the crushed straws by a 40-200-mesh sieve; pyrolyzing 1000g of the obtained straw powder in a 600 ℃ tubular furnace for 3 hours at a heating rate of 5 ℃/min; washing the residue with 0.1mol/L hydrochloric acid, washing with proper amount of deionized water for three times until the residue is neutral, drying the product at 105 ℃ for 12 hours, and taking out the product for later use.
Preferably, the second step further comprises the following steps of adding the mixture of carbon powder, carbon and salt obtained in the second step into a nitric acid solution, uniformly mixing, reacting for 2 hours at the temperature of 80 ℃, filtering, washing and drying to obtain the biochar.
Preferably, the second step further comprises the following step that the straws used in the carbonization are from at least one of wheat, rice, corn, potatoes, rape, cotton and sugarcane.
Preferably, the carbon and salt mixture is heated in an inert gas atmosphere, the heating is stopped after the high-temperature doping treatment, the mixture is cooled to room temperature, acid washing, water washing and drying are sequentially carried out, the nitrogen and phosphorus co-doped biochar-based redox reaction catalyst is obtained, and the temperature of the high-temperature doping treatment is 700-900 ℃.
Preferably, the inert gas atmosphere is nitrogen atmosphere or argon atmosphere, the heating rate is 5-10 ℃/min, and the heat preservation time is 6-10 h.
Preferably, the application of the biochar-based catalyst is mainly used for treating VOCs under the condition that the drum revolution of a reactor is kept to be 0.2-2 r/min, the pH value is 6.5-7.5, the temperature is 25-30 ℃, and the concentration value of the treated VOCs is 350-1000 mg/m.
The invention provides a biochar-based catalyst and a synthesis method and application thereof. The method has the following beneficial effects:
according to the invention, the high-activity biochar-based catalyst has the catalytic characteristics of multi-element metals, the mixture of carbon and salt presents high-efficiency performance for synchronously removing VOCs in an inert gas oxidation technical system, agricultural wastes straw is used as a biochar raw material, and the straw is washed by hydrochloric acid to be a reducing agent, so that various metal ions are converted into high-activity zero-valent metal catalyst particles.
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 creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the embodiment of the invention provides a biochar-based catalyst and a synthesis method and application thereof, wherein the biochar-based catalyst comprises biochar, and the specific surface area of the biochar-based redox reaction catalyst is 700m/g.
Firstly, carrying out acid washing pretreatment on wheat straws: treating wheat straws with a nitric acid solution with a certain concentration, and then cleaning with deionized water to obtain acid-washed pretreated wheat straws;
step two, grinding the wheat straws to the particle size of 50 meshes to obtain wheat straw powder, and roasting the wheat straw powder obtained in the step one for 2 hours at the temperature of 700 ℃ under the nitrogen atmosphere to obtain carbon powder;
step three, adding biochar, thionyl chloride and dimethylformamide, uniformly mixing, then carrying out immersion reaction for 1.5h at the temperature of 80 ℃ under the ultrasonic condition, washing by adopting anhydrous tetrahydrofuran, and carrying out vacuum filtration to obtain the formyl chloride tea stalk-based biochar adsorption catalyst, wherein the high-activity biochar-based catalyst has the catalytic property of multi-metal, the mixture of carbon and salt presents high efficiency for synchronously removing VOCs in an inert gas oxidation technical system, the agricultural waste straws are biochar raw materials, and the straws are washed by hydrochloric acid to be reducing agents and convert various metal ions into high-activity zero-valent metal catalyst particles.
The first step comprises the following steps of drying cleaned straws for 12 hours at 105 ℃, crushing the straws by a grinder and sieving the straws by a 50-mesh sieve; 1000g of the obtained straw powder is pyrolyzed in a 600 ℃ tubular furnace for 3 hours, and the heating rate is 5 ℃/min; washing the residue with 0.1mol/L hydrochloric acid, washing with deionized water for three times until the residue is neutral, drying the product at 105 ℃ for 12 hours, and taking out the product for later use.
And step two also comprises the following steps of adding the mixture of the carbon powder, the carbon and the salt obtained in the step two into a nitric acid solution, uniformly mixing, reacting for 1.4 hours at the temperature of 80 ℃, filtering, washing and drying to obtain the biochar.
The second step also comprises the following steps, wherein the straws used in the carbonization are from wheat.
Heating the carbon and salt mixture in an inert gas atmosphere, stopping heating after high-temperature doping treatment, cooling to room temperature, and sequentially carrying out acid washing, water washing and drying to obtain the nitrogen and phosphorus co-doped biochar-based redox reaction catalyst, wherein the temperature of the high-temperature doping treatment is 750 ℃.
The inert gas atmosphere is nitrogen atmosphere or argon atmosphere, the heating rate is 7 ℃/min, and the heat preservation time is 8h.
The biochar-based catalyst is mainly used for the application that VOCs are used as treatment conditions, the rotating drum revolution of a reactor is kept to be 1.5r/min, the pH value is 7, the temperature is 25 ℃, and the concentration value of treated VOCs is 900 mg/m.
Example two:
the embodiment of the invention provides a biochar-based catalyst and a synthesis method and application thereof, wherein the biochar-based catalyst comprises biochar, and the specific surface area of the biochar-based redox reaction catalyst is 700m/g.
Firstly, carrying out acid washing pretreatment on wheat straws: treating wheat straws with a nitric acid solution with a certain concentration, and then cleaning with deionized water to obtain acid-washed pretreated wheat straws;
step two, crushing the wheat straw into the grain size of 50 meshes to obtain wheat straw powder, and roasting the wheat straw powder obtained in the step one for 2 hours at the temperature of 700 ℃ under the nitrogen atmosphere to obtain carbon powder;
step three, adding biochar, thionyl chloride and dimethylformamide, uniformly mixing, then carrying out immersion reaction for 1.5h at the temperature of 90 ℃ under the ultrasonic condition, washing by adopting anhydrous tetrahydrofuran, and carrying out vacuum filtration to obtain the formyl chloride tea stalk-based biochar adsorption catalyst, wherein the high-activity biochar-based catalyst has the catalytic property of multi-metal, the mixture of carbon and salt presents high efficiency for synchronously removing VOCs in an inert gas oxidation technical system, the agricultural waste straws are biochar raw materials, and the straws are washed by hydrochloric acid to be reducing agents and convert various metal ions into high-activity zero-valent metal catalyst particles.
Step one comprises the following steps of drying the cleaned straws at 105 ℃ for 12 hours, crushing the straws by a grinder, and sieving the straws by a 50-mesh sieve; 1000g of the obtained straw powder is pyrolyzed in a 600 ℃ tubular furnace for 3 hours, and the heating rate is 5 ℃/min; washing the residue with 0.1mol/L hydrochloric acid, washing with proper amount of deionized water for three times until the residue is neutral, drying the product at 105 ℃ for 12 hours, and taking out the product for later use.
And step two also comprises the following steps of adding the mixture of the carbon powder, the carbon and the salt obtained in the step two into a nitric acid solution, uniformly mixing, reacting for 2 hours at the temperature of 100 ℃, filtering, washing and drying to obtain the biochar.
The second step also comprises the following steps, wherein the straws used in the carbonization are from wheat.
Heating the carbon and salt mixture in an inert gas atmosphere, stopping heating after high-temperature doping treatment, cooling to room temperature, and sequentially carrying out acid washing, water washing and drying to obtain the nitrogen and phosphorus co-doped biochar-based redox reaction catalyst, wherein the temperature of the high-temperature doping treatment is 1000 ℃.
The inert gas atmosphere is nitrogen atmosphere or argon atmosphere, the heating rate is 7 ℃/min, and the heat preservation time is 8h.
The biochar-based catalyst is mainly used for the application that VOCs are used as treatment conditions, the rotating drum revolution of a reactor is kept to be 1.5r/min, the pH value is 7, the temperature is 25 ℃, and the concentration value of treated VOCs is 900 mg/m.
Example three:
the embodiment of the invention provides a biochar-based catalyst and a synthesis method and application thereof, wherein the biochar-based catalyst comprises biochar, and the specific surface area of the biochar-based redox reaction catalyst is 700m/g.
Firstly, carrying out acid washing pretreatment on wheat straws: treating wheat straws with a nitric acid solution with a certain concentration, and then cleaning with deionized water to obtain acid-washed pretreated wheat straws;
step two, crushing the wheat straw into the grain size of 50 meshes to obtain wheat straw powder, and then roasting the wheat straw powder obtained in the step one for 4 hours at the temperature of 700 ℃ under the nitrogen atmosphere to obtain carbon powder;
step three, adding biochar, thionyl chloride and dimethylformamide, uniformly mixing, then carrying out immersion reaction for 5 hours at the temperature of 80 ℃ under the ultrasonic condition, washing by adopting anhydrous tetrahydrofuran, and carrying out vacuum filtration to obtain the formyl chloride tea stalk-based biochar adsorption catalyst, wherein the high-activity biochar-based catalyst has the catalytic property of multi-element metal, the mixture of carbon and salt presents high-efficiency performance of synchronously removing VOCs in an inert gas oxidation technical system, agricultural wastes, straws are biochar raw materials, and the straws are washed by hydrochloric acid to be reducing agents, and various metal ions are converted into high-activity zero-valent metal catalyst particles.
The first step comprises the following steps of drying cleaned straws for 12 hours at 105 ℃, crushing the straws by a grinder and sieving the straws by a 50-mesh sieve; 1000g of the obtained straw powder is pyrolyzed in a 600 ℃ tubular furnace for 3 hours, and the heating rate is 5 ℃/min; washing the residue with 0.1mol/L hydrochloric acid, washing with proper amount of deionized water for three times until the residue is neutral, drying the product at 105 ℃ for 12 hours, and taking out the product for later use.
And step two also comprises the following steps of adding the mixture of the carbon powder, the carbon and the salt obtained in the step two into a nitric acid solution, uniformly mixing, reacting for 6 hours at the temperature of 80 ℃, filtering, washing and drying to obtain the biochar.
The second step also comprises the following steps, wherein the straws used in the carbonization are from wheat.
Heating the carbon and salt mixture in an inert gas atmosphere, stopping heating after high-temperature doping treatment, cooling to room temperature, and sequentially carrying out acid washing, water washing and drying to obtain the nitrogen and phosphorus co-doped biochar-based redox reaction catalyst, wherein the temperature of the high-temperature doping treatment is 750 ℃.
The inert gas atmosphere is nitrogen atmosphere or argon atmosphere, the heating rate is 7 ℃/min, and the heat preservation time is 8h.
The biochar-based catalyst is mainly used for the application that VOCs are used as treatment conditions, the rotating drum revolution of a reactor is kept to be 1.5r/min, the pH value is 7, the temperature is 25 ℃, and the concentration value of treated VOCs is 900 mg/m.
| Temperature of | Time | The surface area is 500-1700 | |
| Example one | 80 | 2 | 900 |
| Example two | 90 | 2 | 400 |
| EXAMPLE III | 80 | 4 | 200 |
Detailed parameters Table 1
From this, it was found that the adsorption effect of the biochar-based catalyst of the present invention was the best.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A biochar-based catalyst comprising biochar, characterized in that; the specific surface area of the biochar-based redox reaction catalyst is 360-800 m/g.
2. A method for synthesizing a biochar-based catalyst, a biochar-based catalyst according to claim 1, comprising the steps of;
firstly, carrying out acid washing pretreatment on wheat straws: treating wheat straws with a nitric acid solution with a certain concentration, and then cleaning with deionized water to obtain acid-washed pretreated wheat straws;
step two, crushing the wheat straw into the grain size of 40-200 meshes to obtain wheat straw powder, and roasting the wheat straw powder obtained in the step one for 1-3 hours at the temperature of 600-800 ℃ under the nitrogen atmosphere to obtain carbon powder;
and step three, further adding biochar, thionyl chloride and dimethylformamide, uniformly mixing, then carrying out immersion reaction for 1-3 hours at the temperature of 40-90 ℃ under the ultrasonic condition, washing by adopting anhydrous tetrahydrofuran, and carrying out vacuum filtration to obtain the formyl chloride tea stalk-based biochar adsorption catalyst.
3. The method for synthesizing a biochar-based catalyst according to claim 2, wherein: the first step comprises the following steps of drying cleaned straws at 105 ℃ for 12 hours, crushing the straws by a grinder, and sieving the crushed straws by a 40-200-mesh sieve; 1000g of the obtained straw powder is pyrolyzed in a 600 ℃ tubular furnace for 3 hours, and the heating rate is 5 ℃/min; washing the residue with 0.1mol/L hydrochloric acid, washing with deionized water for three times until the residue is neutral, drying the product at 105 ℃ for 12 hours, and taking out the product for later use.
4. The method for synthesizing a biochar-based catalyst according to claim 2, wherein: and adding the mixture of the carbon powder, the carbon and the salt obtained in the step two into a nitric acid solution, uniformly mixing, reacting for 1-3 h at the temperature of 70-90 ℃, filtering, washing and drying to obtain the biochar.
5. The method for synthesizing a biochar-based catalyst according to claim 2, wherein: the second step also comprises the following step that the straws used in the carbonization are from at least one of wheat, rice, corn, potatoes, rape, cotton and sugarcane.
6. The method for synthesizing a biochar-based catalyst according to claim 2, wherein: heating the carbon and salt mixture in an inert gas atmosphere, stopping heating after high-temperature doping treatment, cooling to room temperature, and sequentially carrying out acid washing, water washing and drying to obtain the nitrogen and phosphorus co-doped biochar-based redox reaction catalyst, wherein the temperature of the high-temperature doping treatment is 700-900 ℃.
7. The method for synthesizing a biochar-based catalyst according to claim 2, wherein: the inert gas atmosphere is nitrogen atmosphere or argon atmosphere, the heating rate is 5-10 ℃/min, and the heat preservation time is 6-10 h.
8. Use of a biochar-based catalyst according to claim 1, characterized in that: the biochar-based catalyst is mainly used for the application that VOCs are used as treatment conditions, the rotating speed of a rotary drum of a reactor is kept to be 0.2-2 r/min, the pH value is 6.5-7.5, the temperature is 25-30 ℃, and the concentration value of treated VOCs is 350-1000 mg/m.
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|---|---|---|---|---|
| CN107486237A (en) * | 2017-08-30 | 2017-12-19 | 昆明理工大学 | A kind of formyl chloride tea stalk base charcoal adsorption catalyst and preparation method thereof |
| CN109841858A (en) * | 2019-03-27 | 2019-06-04 | 华中科技大学 | The method and product of charcoal base oxygen reduction reaction catalyst are prepared using bean dregs |
| CN110339812A (en) * | 2019-07-09 | 2019-10-18 | 四川大学 | Modification biological charcoal and its application in absorption VOCs |
| US20200298202A1 (en) * | 2017-12-12 | 2020-09-24 | Jiangsu Academy Of Agricultural Sciences | Preparation Method for Combined Modified Straw Active Particulate Carbon Adsorption Material and Use of Same |
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2023
- 2023-01-06 CN CN202310018230.XA patent/CN115957793A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107486237A (en) * | 2017-08-30 | 2017-12-19 | 昆明理工大学 | A kind of formyl chloride tea stalk base charcoal adsorption catalyst and preparation method thereof |
| US20200298202A1 (en) * | 2017-12-12 | 2020-09-24 | Jiangsu Academy Of Agricultural Sciences | Preparation Method for Combined Modified Straw Active Particulate Carbon Adsorption Material and Use of Same |
| CN109841858A (en) * | 2019-03-27 | 2019-06-04 | 华中科技大学 | The method and product of charcoal base oxygen reduction reaction catalyst are prepared using bean dregs |
| CN110339812A (en) * | 2019-07-09 | 2019-10-18 | 四川大学 | Modification biological charcoal and its application in absorption VOCs |
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