CN110694588A - Modified composite biochar and preparation method and application thereof - Google Patents
Modified composite biochar and preparation method and application thereof Download PDFInfo
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- 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
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- 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
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- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
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- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C02F2101/20—Heavy metals or heavy metal compounds
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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/00—Nature of the contaminant
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Abstract
The invention belongs to the field of activated carbon preparation, and particularly relates to modified composite biochar and a preparation method and application thereof. The technical problem to be solved by the invention is to provide a modified composite biochar and a preparation method and application thereof; the preparation method comprises the following steps: A. carbonizing the straws, washing away ash, drying and crushing to obtain straw biochar; B. mixing straw biochar with alkali liquor for chemical modification, separating, washing and drying solids to obtain modified straw biochar; C. performing composite treatment: mixing modified straw biochar, polyethylene glycol and water, adding MIEX, stirring, and performing ultrasonic treatment; then adding ascorbic acid or hydroxylamine, continuously stirring, adding a hydrogen peroxide solution, continuously stirring, separating, washing and drying the solid to obtain the modified composite biochar. The method can prepare the modified composite biochar with good adsorption performance by using the agricultural and forestry waste straws.
Description
Technical Field
The invention belongs to the field of activated carbon preparation, and particularly relates to modified composite biochar, a preparation method thereof and application of the modified composite biochar in metal ion adsorption.
Background
With the great advance of industrialization, environmental management becomes an urgent problem to be solved, and the wastewater discharged from industries such as smelting, chemical engineering, printing and dyeing, textile, nuclear fuel circulation process and the like contains a large amount of pollutants such as heavy metal ions, and if the pollutants are not treated, the pollutants can seriously harm the health of human beings, animals, plants and water body safety when being discharged into the environment.
Compared with methods such as chemical precipitation, membrane treatment, ion exchange, photocatalysis, electrodeposition and the like, the adsorption method has the advantages of high efficiency, simple operation, low price, no by-product, cyclic utilization, no secondary pollution and the like. The industrial application of the adsorbent requires that the preparation method is simple, efficient, low in cost, environment-friendly and the like, so that the universality, richness, accessibility and degradability of raw material sources are of great importance.
At present, the environmental protection is becoming more important and the raw materials are becoming more and more scarce, if biomass such as agricultural and forestry waste can be used as the raw materials to prepare the adsorbing material with excellent performance for removing environmental pollutants, the adsorbing material has important and positive significance to environmental protection, resource regeneration, recycling and the like. On one hand, biomass can be used as a precursor material for preparing biochar, such as agricultural wastes, forestry wastes, aquatic plants, municipal wastes, sewage sludge and the like; on the other hand, since biomass is rich in cellulose and lignin, cellulose and lignin can be extracted from agricultural and forestry waste as natural polymers that are renewable, biodegradable and rich in nature and used as inexpensive adsorbents. The biochar has large specific surface area, a porous structure and rich functional groups on the surface, so that the biochar has better removal capability on pollutants (such as heavy metals, organic pollutants, other pollutants and the like) in an aqueous solution. In addition, studies have shown that activation of biochar (physical activation, chemical activation) or preparation of biomass composites to increase specific surface area, or to enhance surface properties, can greatly improve adsorption performance or increase the species of removing contaminants.
Disclosure of Invention
The invention provides modified composite biochar, a preparation method thereof and a method for adsorbing metal ions in water by using the modified composite biochar, aiming at the problems that the existing biochar is low in activity, difficult to recover and regenerate and the like. The invention takes the straws which are common agricultural wastes as raw materials to prepare the biochar, and adopts the currently commercialized magnetic strong-base anion exchange resin (MIEX for short) to be compounded with the modified biochar after chemical modification to prepare the modified composite biochar which has the advantages of high activity, easy recovery and regeneration and the like.
The invention aims to solve the technical problem of providing a preparation method of modified composite biochar. The preparation method comprises the following steps:
A. preparing straw biochar: carbonizing the straws, washing away ash, drying and crushing to obtain powdery straw biochar;
B. chemical modification: mixing straw biochar with alkali liquor for chemical modification, separating, washing and drying solids to obtain modified straw biochar;
C. performing composite treatment: mixing modified straw biochar, polyethylene glycol and water, adding MIEX, stirring, and performing ultrasonic treatment; then adding ascorbic acid or hydroxylamine, continuously stirring, adding a hydrogen peroxide solution, continuously stirring, separating, washing and drying the solid to obtain the modified composite biochar.
Specifically, in the step a of the preparation method of the modified composite biochar, the straw is at least one of corn straw, wheat straw, rice straw or cotton straw.
Further, in the step A of the preparation method of the modified composite biochar, the straws are cleaned and have the area of 5-10cm2Small pieces of (a).
Specifically, in the step A of the preparation method of the modified composite biochar, the carbonization temperature is 400-600 ℃. The carbonization time is 30 min-4 h.
Specifically, in the step A of the preparation method of the modified composite biochar, the modified composite biochar is crushed to pass through a sieve with 80-160 meshes, and the undersize is powdery straw biochar.
Specifically, in the step B of the preparation method of the modified composite biochar, the alkali liquor is a potassium hydroxide aqueous solution. The concentration is 30-75 g/L.
Specifically, in the step B of the preparation method of the modified composite biochar, the mass-to-volume ratio of the straw biochar to the alkali liquor is 1 g: 10-60 mL.
Specifically, in step B of the preparation method of the modified composite biochar, the specific operation of performing chemical modification is as follows: the mixed system was shaken. Further, the oscillation temperature is 10-80 ℃, the oscillation frequency is 100-600 rpm, and the oscillation time is 3-24 hours.
Specifically, in the step B of the preparation method of the modified composite biochar, the solid is washed until the pH value is 6.5-7.5.
Specifically, in the step C of the preparation method of the modified composite biochar, the volume ratio of the polyethylene glycol to the water is 1: 5-40.
Further, in the step C of the preparation method of the modified composite biochar, the polyethylene glycol is PEG-200 polyethylene glycol.
Specifically, in the step C of the preparation method of the modified composite biochar, the mass ratio of the modified straw biochar to the MIEX is 5-30: 1.
Specifically, in the step C of the preparation method of the modified composite biochar, the stirring time is 15 min-2 h after the MIEX is added.
Specifically, in the step C of the preparation method of the modified composite biochar, the ultrasonic treatment frequency is 150-500W, and the ultrasonic time is 0.5-4 h.
In the step C of the preparation method of the modified composite biochar, the mass ratio of the ascorbic acid or hydroxylamine to the modified straw biochar is 1: 2-8.
Specifically, in the step C of the preparation method of the modified composite biochar, the stirring time is 15-30 min after ascorbic acid or hydroxylamine is added.
Specifically, in the step C of the preparation method of the modified composite biochar, the volume ratio of the polyethylene glycol to the hydrogen peroxide solution is 1: 1-4.
Further, in the step C of the preparation method of the modified composite biochar, the mass fraction of the hydrogen peroxide solution is 1-5%.
Specifically, in the step C of the preparation method of the modified composite biochar, the stirring time is 30 min-2 h after the hydrogen peroxide solution is added.
Specifically, in the step C of the preparation method of the modified composite biochar, the washing is washing or soaking washing by sequentially adopting alkali liquor, absolute ethyl alcohol and deionized water.
Further, in the step C of the preparation method of the modified composite biochar, the alkali liquor is a sodium hydroxide aqueous solution. The concentration is 1-2 mol/L.
Specifically, in the step C of the preparation method of the modified composite biochar, the drying temperature is 60-200 ℃, and the drying time is 4-12 hours.
The invention also provides the modified composite biochar prepared by the preparation method of the modified composite biochar.
The invention also provides application of the modified composite biochar in the aspect of adsorbing metal ions. The adsorption method comprises the following steps: weighing the modified composite adsorbent, and adding liquid of metal to be adsorbed for adsorption. The metal may be any metal, such as common metals or heavy metals, e.g., V, Fe, Cu, Cr, Na, Al, Ca, Cd, Pb, Zn, and the like.
Further, in the adsorption method, the modified composite adsorbent is weighed, the liquid to be adsorbed with the metal is added, and the mixture is placed in a constant temperature oscillator for oscillation.
Furthermore, in the adsorption method, the oscillation time is 2-18 h, the reaction temperature is 10-50 ℃, and the oscillation frequency is 100-500 rpm.
The modified composite adsorbent after adsorbing metal is washed by a small amount of deionized water and can be reused after being treated by regenerated liquid.
The method can take the agricultural and forestry waste straws as the raw material, and effectively solves the problems of environmental pollution and resource waste caused by common post-treatment methods (such as combustion, burying, stacking and the like) of the agricultural and forestry waste straws.
According to the method, the traditional biochar is subjected to chemical modification and magnetic resin compounding, so that the porosity, the specific surface area and the oxygen-containing functional groups of the biochar are increased, and the adsorption capacity is increased; meanwhile, the magnetic resin is compounded, so that the adsorption is further enhanced, and the recovery and regeneration are convenient.
The method of the invention avoids the problem that metal ions are remained in the water body because the biochar compounded by magnetic metal or metal salt is required to be introduced conventionally.
Detailed Description
The preparation method of the modified composite biochar comprises the following steps:
1. pretreating biological carbon: soaking fresh straws in clear water to remove surface silt, and shearing into pieces with the area of 5-10cm2Washing the small blocks with clear water for 2 times, and then washing with deionized water for 2 times;
2. preparing straw biochar: placing the straws in a muffle furnace for high-temperature vacuum heating, wherein the temperature of the muffle furnace is set to be 400-600 ℃, and the heating time is 30 min-4 h; washing with deionized water to remove ash, performing suction filtration until filtrate is clear and transparent, drying at 105 ℃ to constant weight to prepare straw biochar, crushing with a crusher to obtain powdery biochar, sieving materials with a 80-160-target standard sample sieve, and taking undersize and sealing bags for later use; in the step, straws are pyrolyzed under the condition of limited oxygen or oxygen deficiency (T <700 ℃) to obtain straw biochar, and as the biochar surface is rich in a large number of functional groups and mainly takes acidic functional groups as main materials, the surface of the biochar is always negatively charged, so that the biochar has a good adsorption effect on cations;
3. preparing a potassium hydroxide solution: dissolving 30-75 g of potassium hydroxide in 1L of deionized water to prepare a potassium hydroxide solution with the concentration of 30-75 g/L;
4. chemical modification treatment: weighing straw biochar in a conical flask, adding a potassium hydroxide solution, sealing the flask opening with a sealing membrane, placing the flask opening in a constant-temperature oscillator for oscillation, wherein m (straw biochar/g)/[ v (potassium hydroxide solution/mL) is 1: 10-60, setting the reaction temperature of the constant-temperature oscillator to be 10-80 ℃, the oscillation frequency to be 100-600 rpm, the reaction time to be 3-24 h, after the reaction is finished, performing suction filtration, washing filter residues with deionized water until the pH value of the solution is 6.5-7.5, and drying the filter residues at 60 ℃ to constant weight to prepare the modified straw biochar;
5. performing composite treatment: weighing modified straw biochar, adding the modified straw biochar into a beaker, adding polyethylene glycol and deionized water, wherein the polyethylene glycol is used as a pore-forming agent and a dispersing agent, the volume ratio of the polyethylene glycol to the deionized water is 1: 5-40, adding MIEX under the state of mechanical stirring, the mass ratio of the modified straw biochar to the MIEX is 5-30: 1, and continuously stirring the mixture at room temperature in air for 15 min-2 h; ultrasonic treatment, wherein the frequency is 150-500W, and the ultrasonic time is 0.5-4 h; adding ascorbic acid or hydroxylamine as a reducing agent, continuously stirring for 15-30 min, wherein the mass ratio of the ascorbic acid or hydroxylamine to the modified straw biochar is 1: 2-8, slowly adding a hydrogen peroxide solution with the mass fraction of 1-5% as a reaction protective agent, wherein the volume ratio of polyethylene glycol to the hydrogen peroxide solution is 1: 1-4, continuously stirring for 30 min-2 h, performing centrifugal separation, transferring the particles into 1-2 mol/L sodium hydroxide solution, soaking for 2-8 h, soaking and washing with absolute ethyl alcohol and deionized water, and placing in a vacuum drier for drying treatment, wherein the temperature is set to be 60-200 ℃, and the drying time is 4-12 h, so that the modified composite biochar can be obtained.
The invention also provides the modified composite biochar prepared by the preparation method.
The invention also provides the application of the metal ion adsorbent. The adsorption application method comprises the following steps: weighing the modified composite adsorbent, placing the modified composite adsorbent in a conical flask, adding a metal-containing liquid, placing the conical flask in a constant-temperature oscillator, oscillating for 2-18 h at the reaction temperature of 10-50 ℃ and the oscillation frequency of 100-500 rpm, performing suction filtration, and detecting the metal content in filtrate.
The modified composite adsorbent after adsorbing metal is washed by a small amount of deionized water and can be reused after being treated by regenerated liquid.
Example 1
Soaking fresh straw in clear water to remove surface silt, and cutting into noodles with scissorsThe product is about 5-10cm2Washing the small blocks with clear water for 2 times, and then washing with deionized water for 2 times; placing the straws in a muffle furnace for high-temperature vacuum heating, wherein the temperature of the muffle furnace is set to be 400 ℃, and the heating time is 2 hours; washing with deionized water to remove ash, vacuum-filtering until filtrate is clear and transparent, drying at 105 deg.C to constant weight to obtain straw biochar, crushing with a crusher to obtain powdered biochar, sieving with 100-target standard sample sieve, and bagging; dissolving 50g of potassium hydroxide in 1L of deionized water to prepare a potassium hydroxide solution with the concentration of 50 g/L; weighing 40g of straw biochar into a conical flask, adding 600mL of 50g/L potassium hydroxide solution, sealing the opening of the conical flask by using a sealing film, placing the conical flask into a constant-temperature oscillator for oscillation, wherein the reaction temperature of the constant-temperature oscillator is set to be 40 ℃, the oscillation frequency is 400rpm, the reaction time is 12 hours, after the reaction is finished, performing suction filtration, washing filter residues with deionized water until the pH of the solution is 6.5-7.5, and drying the filter residues at 60 ℃ to constant weight to prepare the modified straw biochar; weighing 20g of modified straw biochar, adding the modified straw biochar into a beaker, adding 10mL of polyethylene glycol solution and 80mL of deionized water, adding 2g of MIEX under the state of mechanical stirring, and continuously stirring the mixture at room temperature in air for 1 h; ultrasonic treatment, wherein the frequency is 300W, and the ultrasonic time is 2 h; after adding a quantity of ascorbic acid, slowly adding 20mL of 3% hydrogen peroxide solution with continuous stirring; continuously stirring for 1h, performing centrifugal separation, transferring the particles into 2mol/L sodium hydroxide solution, soaking for 4h, soaking and washing with absolute ethyl alcohol and deionized water, and drying in a vacuum dryer, wherein the temperature is 200 ℃, and the drying time is 8h, so as to obtain the modified composite biochar.
Weighing 15g of modified composite biochar, placing the modified composite biochar in a conical flask, adding 300mL of metal waste liquid, placing the mixture in a constant-temperature oscillator for 6h, reacting at 30 ℃, oscillating at 200rpm, and after suction filtration, detecting the metal content in filtrate, wherein the content of metal ions Fe in the filtrate is reduced by 36.9%, the content of Na in the filtrate is reduced by 62.0%, and the content of Cu in the filtrate is reduced by 50.9%. The modified composite adsorbent is washed by a small amount of deionized water and is treated by a regeneration liquid for reuse.
Example 2
Soaking fresh straw in clear waterWashing off the silt on the surface, and cutting into 5-10cm pieces2Washing the small blocks with clear water for 2 times, and then washing with deionized water for 2 times; placing the straws in a muffle furnace for high-temperature vacuum heating, wherein the temperature of the muffle furnace is set to be 500 ℃, and the heating time is 4 hours; washing with deionized water to remove ash, vacuum-filtering until filtrate is clear and transparent, drying at 105 deg.C to constant weight to obtain straw biochar, crushing with a crusher to obtain powdered biochar, sieving with 100-target standard sample sieve, and bagging; dissolving 80g of potassium hydroxide in 2L of deionized water to prepare a potassium hydroxide solution with the concentration of 40 g/L; weighing 30g of straw biochar in a conical flask, adding 1500mL of 40g/L potassium hydroxide solution, sealing the opening of the conical flask by using a sealing film, and placing the conical flask in a constant-temperature oscillator for oscillation, wherein the reaction temperature of the constant-temperature oscillator is set to be 60 ℃, the oscillation frequency is 400rpm, the reaction time is 6 hours, after the reaction is finished, performing suction filtration, washing filter residues with deionized water until the pH of the solution is 6.5-7.5, and drying the filter residues at 60 ℃ to constant weight to prepare the modified straw biochar; weighing 20g of modified straw biochar, adding the modified straw biochar into a beaker, adding 20mL of polyethylene glycol solution and 200mL of deionized water, adding 5g of MIEX under the state of mechanical stirring, and continuously stirring the mixture at room temperature in air, wherein the stirring time is 45 min; ultrasonic treatment, wherein the frequency is 200W, and the ultrasonic time is 1 h; after adding a plurality of grams of ascorbic acid, slowly adding 40ml of 3% hydrogen peroxide solution under continuous stirring; continuously stirring for 2h, performing centrifugal separation, transferring the particles into 2mol/L sodium hydroxide solution, soaking for 6h, soaking and washing with absolute ethyl alcohol and deionized water, and drying in a vacuum dryer, wherein the temperature is set to 150 ℃, and the drying time is 6h, so as to obtain the modified composite biochar.
Weighing 15g of modified composite biochar, placing the modified composite biochar in a conical flask, adding 500mL of metal waste liquid, placing the mixture in a constant-temperature oscillator for 12h, reacting at 50 ℃, oscillating at 400rpm, and after suction filtration, detecting the metal content in filtrate, wherein the content of metal ions Cr in the filtrate is reduced by 47.3%, the content of Al is reduced by 58.6%, and the content of Cu is reduced by 41.5%. The modified composite adsorbent is washed by a small amount of deionized water and is treated by a regeneration liquid for reuse.
Example 3
Soaking fresh straw in clear water to remove surface silt, and cutting into 5-10cm pieces2Washing the small blocks with clear water for 2 times, and then washing with deionized water for 2 times; placing the straws in a muffle furnace for high-temperature vacuum heating, wherein the temperature of the muffle furnace is set to be 450 ℃, and the heating time is 3 hours; washing with deionized water to remove ash, vacuum-filtering until filtrate is clear and transparent, drying at 105 deg.C to constant weight to obtain straw biochar, crushing with a crusher to obtain powdered biochar, sieving with 100-target standard sample sieve, and bagging; dissolving 140g of potassium hydroxide in 2L of deionized water to prepare a potassium hydroxide solution with the concentration of 70 g/L; weighing 60g of straw biochar into a conical flask, adding 1200mL of 70g/L potassium hydroxide solution, sealing the opening of the conical flask by using a sealing film, placing the conical flask into a constant-temperature oscillator for oscillation, wherein the reaction temperature of the constant-temperature oscillator is set to be 50 ℃, the oscillation frequency is 200rpm, the reaction time is 24 hours, after the reaction is finished, performing suction filtration, washing filter residues with deionized water until the pH value of the solution is 6.5-7.5, and drying the filter residues at 60 ℃ to constant weight to prepare the modified straw biochar; weighing 50g of modified straw biochar, adding the modified straw biochar into a beaker, adding 20mL of polyethylene glycol solution and 400mL of deionized water, adding 10g of MIEX under the state of mechanical stirring, and continuously stirring the mixture at room temperature in air for 4 hours; ultrasonic treatment, wherein the frequency is 500W, and the ultrasonic time is 3 h; after adding a plurality of grams of ascorbic acid, slowly adding 60ml of 3% hydrogen peroxide solution under continuous stirring; continuously stirring for 2h, performing centrifugal separation, transferring the particles into 2mol/L sodium hydroxide solution, soaking for 8h, soaking and washing with absolute ethyl alcohol and deionized water, and drying in a vacuum dryer, wherein the temperature is 120 ℃, and the drying time is 12h, thus obtaining the modified composite biochar.
Weighing 25g of modified composite biochar, placing the modified composite biochar in a conical flask, adding 500mL of metal waste liquid, placing the mixture in a constant-temperature oscillator for 18h, reacting at 50 ℃, oscillating at 300rpm, and after suction filtration, detecting the metal content in filtrate, wherein the content of metal ions V in the filtrate is reduced by 73.02%, the content of Ca in the filtrate is reduced by 51.9%, the content of Cr in the filtrate is reduced by 38.5%, and the content of Al in the filtrate is reduced by 48.3%. The modified composite adsorbent is washed by a small amount of deionized water and is treated by a regeneration liquid for reuse.
Claims (10)
1. The preparation method of the modified composite biochar is characterized by comprising the following steps: the method comprises the following steps:
A. preparing straw biochar: carbonizing the straws, washing away ash, drying and crushing to obtain powdery straw biochar;
B. chemical modification: mixing straw biochar with alkali liquor for chemical modification, separating, washing and drying solids to obtain modified straw biochar;
C. performing composite treatment: mixing modified straw biochar, polyethylene glycol and water, adding MIEX, stirring, and performing ultrasonic treatment; then adding ascorbic acid or hydroxylamine, continuously stirring, adding a hydrogen peroxide solution, continuously stirring, separating, washing and drying the solid to obtain the modified composite biochar.
2. The method for preparing the modified composite biochar according to claim 1, wherein the method comprises the following steps: in the step A, at least any one of the following conditions is satisfied:
the straw is at least one of corn straw, wheat straw, rice straw or cotton straw;
the straw is cleaned and has an area of 5-10cm2Small pieces of (2);
the carbonization temperature is 400-600 ℃; the carbonization time is 30 min-4 h;
and crushing the mixture to pass through a sieve of 80-160 meshes, and obtaining the undersize product as powdery straw biochar.
3. The method for preparing modified composite biochar according to claim 1 or 2, wherein: in the step B, at least any one of the following conditions is satisfied:
the alkali liquor is a potassium hydroxide aqueous solution; further, the concentration of the potassium hydroxide aqueous solution is 30-75 g/L;
the mass-volume ratio of the straw biochar to the alkali liquor is 1g to 10-60 mL;
the specific operation for carrying out the chemical modification is as follows: oscillating the mixed system; further, the oscillation temperature is 10-80 ℃, the oscillation frequency is 100-600 rpm, and the oscillation time is 3-24 hours;
and washing the solid until the pH value is 6.5-7.5.
4. The method for preparing the modified composite biochar according to any one of claims 1 to 3, wherein the method comprises the following steps: in the step C, the volume ratio of the polyethylene glycol to the water is 1: 5-40; further, the polyethylene glycol is PEG-200 polyethylene glycol.
5. The method for preparing the modified composite biochar according to any one of claims 1 to 4, wherein the method comprises the following steps: in the step C, the mass ratio of the modified straw biochar to the MIEX is 5-30: 1.
6. The method for preparing the modified composite biochar according to any one of claims 1 to 5, wherein the method comprises the following steps: in the step C, the mass ratio of the ascorbic acid or hydroxylamine to the modified straw biochar is 1: 2-8.
7. The method for preparing the modified composite biochar according to any one of claims 1 to 6, which is characterized in that: in the step C, the volume ratio of the polyethylene glycol to the hydrogen peroxide solution is 1: 1-4; further, the mass fraction of the hydrogen peroxide solution is 1-5%.
8. The method for preparing the modified composite biochar according to any one of claims 1 to 7, which is characterized in that: in the step C, at least any one of the following conditions is satisfied:
the stirring time is 15 min-2 h after the MIEX is added;
the ultrasonic treatment frequency is 150-500W, and the ultrasonic time is 0.5-4 h;
the stirring time is 15-30 min after adding ascorbic acid or hydroxylamine;
the stirring time is 30 min-2 h after the hydrogen peroxide solution is added;
washing is washing or soaking washing by sequentially adopting alkali liquor, absolute ethyl alcohol and deionized water; further, the alkali liquor is sodium hydroxide aqueous solution; the concentration is 1-2 mol/L.
9. The modified composite biochar prepared by the method for preparing the modified composite biochar as claimed in any one of claims 1 to 8.
10. Use of the modified composite biochar of claim 9 for adsorbing metal ions.
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| CN111229162A (en) * | 2020-01-22 | 2020-06-05 | 青岛农业大学 | Method for preparing magnetic biochar from garlic straws |
| CN112028283A (en) * | 2020-09-05 | 2020-12-04 | 芜湖职业技术学院 | Method for recycling and treating brewing waste liquid |
| CN112275253A (en) * | 2020-09-18 | 2021-01-29 | 武汉科技大学 | Preparation method and application of modified biochar for adsorbing fluoride and cadmium ions in wastewater |
| CN113578264A (en) * | 2021-08-03 | 2021-11-02 | 长安大学 | Hydroxyapatite modified biochar and preparation method and application thereof |
| WO2023134231A1 (en) * | 2022-01-14 | 2023-07-20 | 江苏省农业科学院 | Method for preparing carbon-reduced and carbon-negative products from agricultural and forestry residues |
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| CN113578264A (en) * | 2021-08-03 | 2021-11-02 | 长安大学 | Hydroxyapatite modified biochar and preparation method and application thereof |
| CN113578264B (en) * | 2021-08-03 | 2024-03-26 | 长安大学 | Hydroxyapatite modified biochar and preparation method and application thereof |
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