CN112156756A - Corn straw carbon-based nano adsorbent and preparation method thereof - Google Patents
Corn straw carbon-based nano adsorbent and preparation method thereof Download PDFInfo
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- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 title claims abstract description 71
- 235000002017 Zea mays subsp mays Nutrition 0.000 title claims abstract description 71
- 235000005822 corn Nutrition 0.000 title claims abstract description 71
- 239000010902 straw Substances 0.000 title claims abstract description 59
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 57
- 239000003463 adsorbent Substances 0.000 title claims abstract description 56
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- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 2
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- 238000001179 sorption measurement Methods 0.000 abstract description 36
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- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
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- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
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- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
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- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
-
- 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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
-
- 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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3078—Thermal treatment, e.g. calcining or pyrolizing
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
-
- 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
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
- B01J2220/4825—Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
Abstract
The invention discloses a corn straw carbon-based nano adsorbent and a preparation method thereof, wherein the preparation method comprises the following steps: 1) weighing corn straw residues, adding the corn straw residues into the magnesium salt solution, stirring at constant temperature until most of the solvent is evaporated, and then drying until the solvent is completely evaporated to form a uniform corn straw magnesium salt mixture; 2) placing the formed corn stalk magnesium salt mixture into NH3/N2And carrying out high-temperature carbonization treatment in an atmosphere furnace to obtain the corn straw carbon-based nano adsorbent MgO/C or the nitrogen-doped corn straw carbon-based nano adsorbent N-MgO/C. The preparation process has the advantages of simple flow, easy operation, short period, low preparation cost and the like. The prepared MgO/C, N-MgO/C nano-adsorbent has strong adsorption capacity and high efficiencyThe water treatment agent has high rate, long service life and low price, and breaks through the application bottleneck of the traditional carbon-based adsorption material in the technical field of printing and dyeing wastewater treatment.
Description
Technical Field
The invention belongs to the technical field of preparation of adsorption materials, and particularly relates to a corn straw carbon-based nano adsorbent, in particular to a nitrogen-doped corn straw carbon-based nano adsorbent and a preparation method thereof.
Background
With the rapid development of the industrialization process, the dye wastewater generated in the printing and dyeing industry becomes one of the main sources of water environment pollution. The dye wastewater has the problems of complex components, difficult biodegradation and the like, and can pose great threat to water ecological balance and the water source safety of resident drinking water when being directly discharged into a water body. According to statistics, the content of the azo dye in the dye wastewater exceeds 50 percent. Among them, methyl orange is the most representative azo dye. Therefore, the removal of methyl orange in the printing and dyeing wastewater becomes an urgent task to be solved in the field of water environment. At present, methods for removing methyl orange in wastewater mainly comprise photochemical degradation, biological degradation, chemical oxidation, adsorption and the like. Among them, the adsorption method has been a research hotspot due to its high treatment efficiency, simple operation, good selectivity and no secondary pollution. At present, common adsorption materials mainly comprise carbon nanotubes, graphene, molecular sieves, chitosan, metal oxides and the like, and although the adsorption materials show good application potential in the aspect of removing methyl orange wastewater, the adsorption materials have some problems, such as relatively high cost, complex preparation process, deficient raw material resources, insufficient adsorption capacity and the like, so that the large-scale application of the adsorption materials is limited. Therefore, the development of the biomass-based adsorption material has important scientific significance and practical significance.
The biochar is a porous carbonaceous solid substance prepared by using biomass as a raw material through an oxygen-limited pyrolysis method. Biochar has attracted attention in the field of water pollution treatment due to its significant advantages of large specific surface area, developed pore structure, stable chemical properties, strong acid and alkali resistance, and the like. According to statistics, the annual yield of crop straws in China reaches 6.04 hundred million tons, and the straws are carbon-rich wood fibers and good precursors for preparing biochar. At present, the biochar is reported in the aspect of methyl orange removal, and a comparative adsorption experiment is carried out on methyl orange in dye wastewater by Duwei et al (contemporary chemical engineering, 2019,48(02): 229-. Due to the insufficient active sites of the biochar, the adsorption effect on the methyl orange is limited. Therefore, researchers can modify the biochar by using the metal oxide, and the removal effect of the biochar on methyl orange can be obviously improved. Hurui et al (CN201910799145.5) put the biomass material at 500 deg.C for anaerobic cracking treatment to obtain biochar. And then placing the obtained biochar material in a low-temperature plasma treatment reaction cavity, introducing high-purity argon, stabilizing the vacuum degree in the reaction cavity at 50.0Pa for 5min, then performing radio-frequency low-temperature plasma discharge, and performing pretreatment on the surface of the material for 10min with the discharge power of 100W. And introducing mixed gas of high-purity ammonia gas with the volume fraction of 1.0% and high-purity helium gas with the volume fraction of 99.0% after the pretreatment is finished, adjusting the flow rate of the mixed gas until the vacuum degree in the reaction cavity is 50.0Pa, performing discharge aftertreatment on the material through radio-frequency low-temperature plasma after the mixed gas is stabilized for 10min, setting the discharge time for 15min and the discharge power for 120W, and preparing the straw biochar with the amino-modified surface. However, the biochar-based adsorption material has the problems of complex preparation process, long period, high cost, poor stability and the like.
Disclosure of Invention
The invention aims to solve the technical problems of complex preparation process, high cost, poor stability, insufficient adsorption capacity and the like of the existing biochar-based adsorption material, and provides a simple, low-cost and high-performance preparation method of a corn straw carbon-based nano adsorbent by selecting ammonia gas as a nitrogen source, agricultural waste corn straws as a carbon source and low-price magnesium salt as a magnesium source.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a preparation method of a corn straw carbon-based nano adsorbent comprises the following steps:
(1) weighing a certain amount of corn straw residues, adding the corn straw residues into the magnesium salt solution, stirring at constant temperature until most of the solvent is evaporated, and then drying until the solvent is completely evaporated to form a uniform corn straw magnesium salt mixture;
(2) placing the formed corn straw magnesium salt mixture in an atmosphere furnace in NH3/N2High-temperature carbonization treatment under atmosphere to obtain nitrogen-doped corn straw carbon-based nano adsorbent or N2And carrying out high-temperature carbonization treatment under the atmosphere to obtain the corn straw carbon-based nano adsorbent.
In the preparation method of the corn straw carbon-based nano adsorbent, the magnesium salt in the step (1) is magnesium chloride, and the concentration is not higher than 50 g/L.
According to the preparation method of the corn straw carbon-based nano adsorbent, the particle size of the corn straw residues in the step (1) is 20-100 meshes.
According to the preparation method of the corn straw carbon-based nano adsorbent, the proportion relationship between the mass of the corn straw residues and the volume of the magnesium salt solution in the step (1) is as follows: 5g to 50g, 100mL to 500 mL.
According to the preparation method of the corn straw carbon-based nano adsorbent, the constant-temperature stirring conditions in the step (1) are as follows: the temperature is 60-90 ℃.
In the preparation method of the corn straw carbon-based nano adsorbent, in the step (2), N is2Flow rate of 200mL/min, NH3The flow rate is not more than 50 mL/min; atmosphere furnace in N2Atmosphere or NH3/N2Heating to 500-800 ℃ at a heating rate of 5-10 ℃/min in the atmosphere, and then preserving heat for 2.0-6.0 h to carry out carbonization treatment on the corn straw magnesium salt mixture.
The invention also provides a corn straw carbon-based nano adsorbent with a strong adsorption effect on methyl orange in dye wastewater.
The corn straw carbon-based nano adsorbent is prepared by the preparation method.
The invention has the beneficial effects that:
(1) the preparation method of the corn straw carbon-based nano adsorbent (MgO/C) and the nitrogen-doped corn straw carbon-based nano adsorbent (N-MgO/C) which are simple, low in cost and high in performance is obtained. The preparation process has the advantages of simple flow, easy operation, short period, low preparation cost and the like.
(2) The prepared corn straw carbon-based nano adsorbent (MgO/C) and the nitrogen-doped corn straw carbon-based nano adsorbent (N-MgO/C), particularly the nitrogen-doped corn straw carbon-based nano adsorbent (N-MgO/C), are water treatment agents with strong adsorption capacity, high efficiency, long service life and low price, and break through the application bottleneck of the traditional carbon-based adsorption material in the technical field of printing and dyeing wastewater treatment.
(3) The method not only provides a new idea for the efficient purification of the printing and dyeing wastewater, but also opens up a new way for the comprehensive utilization of the crop straws.
In a word, the invention provides a method for realizing the doping of nitrogen element of biomass and the loading of nano magnesium oxide by using corn straws as raw materials through a one-step method. The doping of nitrogen element in the biochar can improve the adsorption performance on methyl orange through electrostatic adsorption on the one hand, and the nitrogen element and magnesium ions can enhance the stability of the adsorption material through coordination on the other hand. Therefore, the straw carbon-based nano adsorbent prepared by the method has the characteristics of simple preparation process, short period, high stability and the like. The straw carbon-based nano adsorbent has the advantages of large adsorption capacity, high adsorption rate and the like on methyl orange in printing and dyeing wastewater. The adsorbent is low in price, simple in preparation process, long in service life and strong in water purification capacity, and particularly shows great application potential in the aspect of treatment in the field of printing and dyeing wastewater.
Drawings
FIG. 1 is a graph of infrared spectra for C, N-C, N-MgO/C and N-MgO/C-MO;
FIG. 1 is an infrared spectrum of C, N-C, N-MgO/C (example 7) and N-MgO/C-MO (example 7 after adsorption of methyl orange), N-C, N-MgO/C (example 7) at 1040cm in comparison to C-1Amine C-N stretching vibration peaks exist, which indicates that amination reaction exists between ammonia gas and the corn straws in the carbonization process. The absorption peak values of the stretching vibration and the bending vibration of the Mg-O band are 500-650cm-1Within the range, the nitrogen-doped corn straw carbon-based nano adsorption material is further shown to be successfully prepared. N-MgO/C-MO (after adsorption of methyl orange in example 7) was at 1450--1Has azo bond stretching vibration peak at 1185 and 1114cm-1The 1, 4 substituent of benzene ring absorbs vibration peak, which isShows that Methyl Orange (MO) is successfully adsorbed on the nitrogen-doped corn straw carbon-based nano adsorbent matrix.
FIG. 2 is a scanning electron microscope photograph of nitrogen-doped corn stalk carbon-based nano-adsorbent;
FIG. 2 is a photograph of a scanning electron microscope of N-C and N-MgO/C (example 7), and it is apparent that whisker-like nano MgO (about 3 μm in length and about 50nm in diameter) is immobilized on the surface of corn stalk bio-char, indicating that the nitrogen-doped corn stalk carbon-based nano-adsorbent is successfully prepared.
FIG. 3 is a graph of the adsorption effect of nitrogen-doped corn stalk carbon-based nano adsorbent.
FIG. 3 is a graph comparing the adsorption performance of N-C, MgO/C and N-MgO/C (example 7) adsorbents for methyl groups. The adsorption capacity to methyl orange was 16.67mg/g, 54.22mg/g and 67.56mg/g in this order. It can be seen that the N-MgO/C (example 7) adsorbent is the most effective in adsorbing methyl orange. The adsorption amount of N-MgO/C (example 7) was increased by 400% and 125% compared to N-C and MgO/C, respectively.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments for the purpose of making the objects, technical solutions and advantages of the present invention more apparent, but it should not be construed that the scope of the above-described subject matter of the present invention is limited to the following examples.
Example 1:
this example provides a comparative experimental group comprising the following steps:
weighing 5g of corn stalk residue, adding into a beaker containing 100mL of 20g/L magnesium salt solution, stirring under electric power in a water bath at 60 deg.C until most of the solvent is evaporated, drying the beaker in an oven at 105 deg.C for 12h, collecting the sample in NH3/N2An atmosphere furnace with a flow rate of 0/200mL/min (i.e. no NH is introduced into the atmosphere furnace)3Introduction of only N2，N2Flow rate 200mL/min) is heated to 600 ℃ at the speed of 5 ℃/min and roasted for 3h to obtain MgO/C adsorbent, and the MgO/C adsorbent is marked as MgO/C. 0.2g of the MgO/C material was weighed out to obtain 54.22mg/g of 250mL of methyl orange with a concentration of 60 mg/L.
Example 2:
this example provides a comparative experimental group comprising the following steps:
weighing 5g of corn stalk residue, adding into a beaker containing 100mL of distilled water, stirring electrically in a water bath at 60 deg.C until most of the solvent is evaporated, drying the beaker in an oven at 105 deg.C for 12h, collecting the sample in NH3/N2An atmosphere furnace with a flow rate of 20/200mL/min (namely, NH is simultaneously introduced into the atmosphere furnace3And N2，NH3Flow rate 20mL/min, N2Flow 200mL/min) is heated to 600 ℃ at the speed of 5 ℃/min and roasted for 3h to obtain the N-C adsorbent which is marked as N-C. The amount of 0.2g of the N-C adsorbent adsorbed to 250mL of methyl orange having a concentration of 60mg/L was 16.67 mg/g.
Example 3:
the embodiment provides a preparation method of a nitrogen-doped corn straw carbon-based nano adsorbent, which comprises the following steps:
weighing 5g of corn stalk residue, adding into a beaker containing 100mL of 20g/L magnesium salt solution, stirring under electric power in a water bath at 60 deg.C until most of the solvent is evaporated, drying the beaker in an oven at 105 deg.C for 12h, collecting the sample in NH3/N2An atmosphere furnace with a flow rate of 10/200mL/min (namely, NH is simultaneously introduced into the atmosphere furnace3And N2，NH3Flow 10mL/min, N2Flow 200mL/min) is heated to 600 ℃ at the speed of 5 ℃/min and roasted for 3h to obtain an N-MgO/C adsorbent, and the adsorption capacity of 0.2g of the N-MgO/C material to 250mL of methyl orange with the concentration of 60mg/L is 62.93 mg/g.
Example 4:
the embodiment provides a preparation method of a nitrogen-doped corn straw carbon-based nano adsorbent, which comprises the following steps:
weighing 20g of corn stalk residue, adding into a beaker containing 100mL of 30g/L magnesium salt solution, stirring under electric power in a water bath at 60 deg.C until most of the solvent is evaporated, drying the beaker in an oven at 105 deg.C for 12h, collecting the sample in NH3/N2An atmosphere furnace with a flow rate of 30/200mL/min (namely, NH is simultaneously introduced into the atmosphere furnace3And N2，NH3Flow rate30mL/min，N2Flow 200mL/min) is heated to 500 ℃ at the speed of 8 ℃/min and roasted for 6h to obtain an N-MgO/C adsorbent, and 0.2g of the N-MgO/C material is weighed so that the adsorption capacity of the N-MgO/C material to 250mL of methyl orange with the concentration of 60mg/L is 64.22 mg/g.
Example 5:
the embodiment provides a preparation method of a nitrogen-doped corn straw carbon-based nano adsorbent, which comprises the following steps:
weighing 30g of corn stalk residue, adding into a beaker containing 300mL of 20g/L magnesium salt solution, stirring under electric force in a water bath at 90 deg.C until most of the solvent is evaporated, drying the beaker in an oven at 105 deg.C for 12h, collecting the sample in NH3/N2An atmosphere furnace with a flow rate of 50/200mL/min (namely, NH is simultaneously introduced into the atmosphere furnace3And N2，NH3Flow 50mL/min, N2Flow 200mL/min) is heated to 700 ℃ at the speed of 8 ℃/min and roasted for 2h to obtain an N-MgO/C adsorbent, and 0.2g of the N-MgO/C material is weighed so that the adsorption capacity of the N-MgO/C material to 250mL of methyl orange with the concentration of 60mg/L is 65.36 mg/g.
Example 6:
the embodiment provides a preparation method of a nitrogen-doped corn straw carbon-based nano adsorbent, which comprises the following steps:
weighing 40g of corn stalk residue, adding into a beaker containing 100mL of 50g/L magnesium salt solution, stirring with electric motor in 80 deg.C water bath until most of solvent is evaporated, drying the beaker in an oven at 105 deg.C for 12h, collecting sample, and adding NH3/N2An atmosphere furnace with a flow rate of 40/200mL/min (namely, NH is simultaneously introduced into the atmosphere furnace3And N2，NH3Flow rate 40mL/min, N2Flow 200mL/min) is heated to 800 ℃ at the speed of 10 ℃/min and roasted for 2h to obtain an N-MgO/C adsorbent, and the adsorption capacity of 0.2g of the N-MgO/C material to 250mL of methyl orange with the concentration of 60mg/L is 67.43 mg/g.
Example 7:
the embodiment provides a preparation method of a nitrogen-doped corn straw carbon-based nano adsorbent, which comprises the following steps:
50g of corn stalk residues are weighed and added into the packageIn a beaker containing 500mL of a 20g/L magnesium salt solution, the mixture is stirred electrically in a water bath at 80 ℃ until most of the solvent is evaporated, the beaker is then dried in an oven at 105 ℃ for 12 hours, and the sample is collected in NH3/N2An atmosphere furnace with a flow rate of 50/200mL/min (namely, NH is simultaneously introduced into the atmosphere furnace3And N2，NH3Flow 50mL/min, N2Flow 200mL/min) is heated to 800 ℃ at the speed of 10 ℃/min and roasted for 4h to obtain an N-MgO/C adsorbent, and 0.2g of the N-MgO/C material is weighed to have the adsorption capacity of 67.56mg/g for 250mL of methyl orange with the concentration of 60 mg/L.
Claims (7)
1. A preparation method of a corn straw carbon-based nano adsorbent is characterized by comprising the following steps: the method comprises the following steps:
(1) weighing a certain amount of corn straw residues, adding the corn straw residues into the magnesium salt solution, stirring at constant temperature until most of the solvent is evaporated, and then drying until the solvent is completely evaporated to form a uniform corn straw magnesium salt mixture;
(2) placing the formed corn straw magnesium salt mixture in an atmosphere furnace in NH3/N2High-temperature carbonization treatment under atmosphere to obtain nitrogen-doped corn straw carbon-based nano adsorbent or N2And carrying out high-temperature carbonization treatment under the atmosphere to obtain the corn straw carbon-based nano adsorbent.
2. The preparation method of the corn stalk carbon-based nano adsorbent according to claim 1, characterized in that: the magnesium salt in the step (1) is magnesium chloride, and the concentration is not higher than 50 g/L.
3. The preparation method of the corn stalk carbon-based nano adsorbent according to claim 1, characterized in that: the grain size of the corn straw residue in the step (1) is 20-100 meshes.
4. The preparation method of the corn stalk carbon-based nano adsorbent according to claim 1, characterized in that: the proportion relationship between the mass of the corn straw residues and the volume of the magnesium salt solution in the step (1) is as follows: 5g to 50g, 100mL to 500 mL.
5. The preparation method of the corn stalk carbon-based nano adsorbent according to claim 1, characterized in that: the constant-temperature stirring conditions in the step (1) are as follows: the temperature is 60-90 ℃.
6. The preparation method of the corn stalk carbon-based nano adsorbent according to claim 1, characterized in that: in the step (2), N2Flow rate of 200mL/min, NH3The flow rate is not more than 50 mL/min; atmosphere furnace in N2Atmosphere or NH3/N2Heating to 500-800 ℃ at a heating rate of 5-10 ℃/min in the atmosphere, and then preserving heat for 2.0-6.0 h to carry out carbonization treatment on the corn straw magnesium salt mixture.
7. A corn stalk carbon-based nano adsorbent, which is prepared by the preparation method of any claim 1-6.
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