CN113004902A - Method for preparing biochar by co-pyrolyzing bentonite and metal - Google Patents
Method for preparing biochar by co-pyrolyzing bentonite and metal Download PDFInfo
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- CN113004902A CN113004902A CN202110177108.8A CN202110177108A CN113004902A CN 113004902 A CN113004902 A CN 113004902A CN 202110177108 A CN202110177108 A CN 202110177108A CN 113004902 A CN113004902 A CN 113004902A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/08—Aluminium compounds, e.g. aluminium hydroxide
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K2101/00—Agricultural use
Abstract
The invention discloses a method for preparing biochar by co-pyrolyzing bentonite and metal, which is implemented by the following steps: cutting fresh cotton straw into pieces, washing with water, drying in an oven, and pulverizing with a pulverizer; mixing the pretreated biomass with bentonite and trace elements; putting the mixture into an oven for drying to obtain biomass mixed powder; and putting the obtained biomass mixed powder into a quartz tube with a plug, connecting the quartz tube with the plug to a vacuum pump through a plurality of gas washers, then carrying out co-pyrolysis under the microwave heating condition, cooling the sample to room temperature after the pyrolysis is finished, washing the sample with deionized water, and then drying the sample in a drying oven to obtain trace element mediated bentonite/biochar, thereby finishing the preparation of the biochar. Solves the problem of poor stability of the biochar in the prior art.
Description
Technical Field
The invention belongs to the technical field of chemical engineering and agriculture, and relates to a method for preparing biochar by co-pyrolyzing bentonite and metal.
Background
The low utilization rate of chemical fertilizer and the drought and water shortage of soil are two major factors restricting the sustainable development of agriculture. In order to improve the crop yield, the total fertilizer application amount is increased year by year, soil acidification is accelerated by applying the fertilizer for a long time, and nutrient elements are seriously lost after the traditional instant fertilizer is applied, so that not only is the resource waste caused, but also the risk of environmental pollution and the reduction of the physical and chemical functions of the soil are more severe. The biochar has a stable carbon skeleton structure, a developed pore structure and a larger specific surface area, and can be used as a soil conditioner and a carbon sink agent to improve the level of soluble organic carbon in soil and improve the physical properties and structure of soil. Meanwhile, the outstanding carbon fixing potential of the biochar is more attractive to inhibit global warming and sustainable resource management. In addition, the charcoal-based slow release fertilizer can be prepared by mixing the biochar and the fertilizer, so that the utilization rate of the original fertilizer can be improved, and the endowment of soil can be improved.
However, the stability of the existing biochar in soil is poor, and the biochar is easily influenced by external environments such as moisture content, pH, temperature and the like, so that the application of biochar products is directly limited. The stability of the biochar plays a key role in soil improvement, fertilizer slow release and carbon fixation. Therefore, the stability of the biochar is improved, and the method has higher scientific significance. The research finds that due to the existence of the biomass endogenous minerals, the carbon decomposition is catalyzed during pyrolysis, the structure of the biochar is developed in a disordering direction, and the carbon stability of the biochar prepared by the demineralized peanut shells and the demineralized cow dung is increased by 52.7% and 30.6% respectively compared with that of the biochar prepared by the original biomass. The thermal stability and chemical stability of the corn straw biochar and the wheat straw biochar are researched by Zhao Jinfeng and the like, and the results show that the thermal stability of the biochar prepared at the same temperature is higher due to the fact that the content of lignin of the corn straw is higher than that of the wheat straw.
At present, the co-pyrolysis of clay minerals and biomass is considered to be an advanced technology for improving the stability of the biochar, the addition of the clay can accelerate the pyrolysis of the biomass, increase the aromatic condensation degree of the biochar and reduce the oxidation of the biochar, so that the stability of the obtained biochar is improved. Li et al found that the aromatic carbon content of the kaolin modified biochar was increased by 42.5% over the untreated biochar by co-pyrolysis of straw and kaolin. Sewu et al co-pyrolyze bentonite and algae and found that the contents of H and O are significantly reduced, but the aromatic polycondensation degree of biochar modified by bentonite is increased and the stability is improved by 27%. Although the addition of clay during pyrolysis of biomass is advantageous for the preparation of highly stable biochar, there is still a need to further improve its stability.
The addition of trace metal elements in the biomass pyrolysis process is another effective method for improving the stability of the biochar. This is because the interaction between the metal salt and oxygen during the co-pyrolysis process not only enhances the aromatization of the biochar, but also generates new metal minerals on the biochar surface. The addition of FeCl3 & 6H2O, MgCl2 & 6H2O or CaCl2 during biomass pyrolysis by Xiao et al significantly improves the stability of biochar, wherein the chemical stability and biological stability of the iron-containing biochar are the highest, because C-O aromatization is enhanced due to the formation of Fe3O4 and Fe4(PO4)2O on the surface of the biochar. And the addition of the trace elements provides a nutrient source for the growth of plant crops, provides a living place for microorganisms and increases the fertility of the biochar.
In view of the fact that a great deal of research shows that the clay modified biochar obtained by co-pyrolysis of biomass and clay has higher stability than unmodified biochar, the stability of the obtained biochar can be improved by adding trace metal elements in the biomass pyrolysis process, so that the stability of the clay modified biochar can be expected to be further improved by adding the trace metal elements in the co-pyrolysis process of clay and biomass, and further the endowment of soil is improved.
Disclosure of Invention
The invention aims to provide a method for preparing biochar by co-pyrolyzing bentonite and metal, which solves the problem of poor stability of biochar in the prior art.
The technical scheme adopted by the invention is that the method for preparing the biochar by co-pyrolyzing bentonite and metal is implemented according to the following steps:
step 1, pretreatment of biomass: cutting fresh cotton straw into pieces, washing with water for multiple times, drying in a drying oven at 105 ℃ for 48h, then crushing by a crusher, and sieving by a sieve of 10-100 meshes;
step 2, mixing the pretreated biomass with bentonite and trace elements: mixing cotton straw powder and bentonite in deionized water, and adding ZnSO respectively4·7H2O、FeSO4·7H2O and MnSO4·H2O; then adjusting the pH value of the suspension to 10 by using NaOH solution; stirring the mixture for 2 hours at the rotating speed of 600 revolutions per minute, and then carrying out ultrasonic treatment for 30 min; drying the mixture in an oven at 80 ℃ for 48h, and then grinding and sieving the mixture by a sieve with 10-100 meshes to obtain biomass mixed powder;
step 3, preparation of trace element mediated bentonite/biochar: putting the biomass mixed powder obtained in the step 2 into a quartz tube with a plug, connecting the quartz tube with the plug to a vacuum pump through a plurality of gas washers, then carrying out co-pyrolysis under the microwave heating condition, cooling a sample to room temperature after pyrolysis is finished, washing the sample for 3 times by deionized water, and then drying the sample in an oven at 105 ℃ for 24 hours to obtain microelement-mediated bentonite/biochar, wherein biochar markers of Zn-bentonite/biochar, Fe-bentonite/biochar and Mn-bentonite/biochar prepared by adding different microelements are used for completing the preparation of the biochar.
The invention is also characterized in that:
in the step 1, the cotton straw is cut into pieces with the length of 2-3 cm.
In the step 2, the mass ratio of the cotton straw powder to the bentonite is 1-20: 1-10.
Deionized water in step 2 was 100 mL.
ZnSO in step 24·7H2O、FeSO4·7H2O and MnSO4·H2The concentration of O is 0.1-1.0 mol/L.
The concentration of NaOH in the step 2 is 5 mol/L.
The amount of biomass mixed powder added in step 3 was 10 g.
In the step 3, the microwave power is 100-.
And in the step 3, the vacuum degree is kept at 0.08MPa in the pyrolysis process.
The invention has the beneficial effects that: the method for preparing the biochar by co-pyrolyzing the bentonite and the metal solves the problems of poor stability and unsatisfactory slow release effect of the biochar in the prior art, thereby improving the soil improvement effect, improving the utilization rate of plants on nutrient substances and the carbon fixation effect and having good economic and environmental benefits. Therefore, the utilization rate of the plants to nutrient substances is improved, the carbon fixation efficiency is improved, good economic and environmental benefits are achieved, the carbon content in the bentonite/biochar is reduced due to the existence of Zn, Fe and Mn in the pyrolysis process, and the oxidation resistance of the biochar is improved. In addition, the charcoal prepared by co-pyrolysis of the trace elements and the bentonite/biomass has good phosphorus leaching resistance.
Drawings
FIG. 1 is a scanning electron microscope image of Zn-bentonite/biochar prepared by microwave co-pyrolysis in a method for preparing biochar by co-pyrolyzing bentonite and metal according to the invention;
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a method for preparing biochar by co-pyrolyzing bentonite and metal, which is implemented by the following steps:
step 1, pretreatment of biomass: cutting fresh cotton straw into pieces, washing with water for multiple times, drying in a drying oven at 105 ℃ for 48h, then crushing by a crusher, and sieving by a sieve of 10-100 meshes; in the step 1, the cotton straw is cut into pieces with the length of 2-3 cm.
Step 2, mixing the pretreated biomass with bentonite and trace elements: mixing cotton straw powder and bentonite in deionized water, and adding ZnSO respectively4·7H2O、FeSO4·7H2O and MnSO4·H2O; then adjusting the pH value of the suspension to 10 by using NaOH solution; will be mixed withStirring the mixture for 2 hours at the rotating speed of 600 revolutions per minute, and then carrying out ultrasonic treatment for 30 min; drying the mixture in an oven at 80 ℃ for 48h, and then grinding and sieving the mixture by a sieve with 10-100 meshes to obtain biomass mixed powder;
in the step 2, the mass ratio of the cotton straw powder to the bentonite is 1-20: 1-10.
Deionized water in step 2 was 100 mL.
ZnSO in step 24·7H2O、FeSO4·7H2O and MnSO4·H2The concentration of O is 0.1-1.0 mol/L.
The concentration of NaOH in the step 2 is 5 mol/L.
Step 3, preparation of trace element mediated bentonite/biochar: putting the biomass mixed powder obtained in the step 2 into a quartz tube with a plug, connecting the quartz tube with the plug to a vacuum pump through a plurality of gas washers, then carrying out co-pyrolysis under the microwave heating condition, cooling a sample to room temperature after pyrolysis is finished, washing the sample for 3 times by deionized water, and then drying the sample in an oven at 105 ℃ for 24 hours to obtain microelement-mediated bentonite/biochar, wherein biochar markers of Zn-bentonite/biochar, Fe-bentonite/biochar and Mn-bentonite/biochar prepared by adding different microelements are used for completing the preparation of the biochar.
The amount of biomass mixed powder added in step 3 was 10 g.
In the step 3, the microwave power is 100-.
And in the step 3, the vacuum degree is kept at 0.08MPa in the pyrolysis process.
The invention discloses a method for preparing biochar by co-pyrolyzing bentonite and metal, which evaluates the thermal stability and oxidation resistance of the biochar by thermogravimetry and chemical oxidation. Obtaining the relative oxidation resistance index R of the biochar by using thermogravimetry50. The chemical oxidation method was measured by potassium dichromate oxidation, and the chemical oxidation stability was represented by CRVs. The phosphorus eluviation was measured in soil.
Example 1
Pretreating cotton straws:
cutting fresh cotton stalk into 2-3cm slices, washing with water for several times, drying in oven at 105 deg.C for 48 hr, pulverizing with pulverizer, and sieving with 60 mesh sieve.
Mixing cotton straw, bentonite and Zn elements:
mixing cotton straw powder and bentonite in a ratio of 1-20:1-10 in 100mL of deionized water, and adding 0.1mol/L ZnSO4·7H2And O. The pH of the suspension is then adjusted to 10 with 5mol/L NaOH solution. The mixture was stirred at 600 rpm for 2h and then sonicated for 30 min. The mixture was dried in an oven at 80 ℃ for 48h and then ground through a 60 mesh screen.
Preparing Zn-bentonite/biochar:
10g of the biomass mixed powder was put into a stoppered quartz tube connected to a vacuum pump through a plurality of gas scrubbers, and then co-pyrolysis was performed at a microwave power of 700W for a microwave time of 20 min. After pyrolysis the samples were cooled to room temperature. Washing with deionized water for 3 times, and drying in oven at 105 deg.C for 24 hr to obtain Zn-bentonite/biochar.
As shown in fig. 1, in a scanning electron microscope image of the biochar after bentonite and Zn ions are added, the surface of the biochar becomes rough, which is beneficial to the adhesion of metal elements on the surface of the biochar.
R of Zn-bentonite/biochar50Values higher than 0.7, much higher than 0.475 and 0.566 for pure biochar and bentonite/biochar. The CRVs of Zn-bentonite/biochar is 89.58, higher than 88.08 and 76.99 for pure biochar and bentonite/biochar. The phosphorus leaching rate of Zn-bentonite/biochar is 67.74%, which is lower than 75.67% and 69.97% of pure biochar and bentonite/biochar.
Example 2
Pretreating cotton straws:
cutting fresh cotton stalk into 2-3cm slices, washing with water for several times, drying in oven at 105 deg.C for 48 hr, pulverizing with pulverizer, and sieving with 10 mesh sieve.
Mixing cotton straw, bentonite and Zn elements:
mixing cotton straw powder and bentonite in a ratio of 1:5 in 100mL of deionized water, and adding 0.5mol/L ZnSO4·7H2O。The pH of the suspension is then adjusted to 10 with 5mol/L NaOH solution. The mixture was stirred at 600 rpm for 2h and then sonicated for 30 min. The mixture was dried in an oven at 80 ℃ for 48h and then ground through a 10 mesh screen.
Preparing Zn-bentonite/biochar:
10g of the biomass mixed powder was put into a stoppered quartz tube connected to a vacuum pump through a plurality of gas scrubbers, and then co-pyrolysis was performed at a microwave power of 100W for a microwave time of 50 min. After pyrolysis the samples were cooled to room temperature. Washing with deionized water for 3 times, and drying in oven at 105 deg.C for 24 hr to obtain Zn-bentonite/biochar.
R of Zn-bentonite/biochar50Values higher than 0.7, much higher than 0.475 and 0.566 for pure biochar and bentonite/biochar. The CRVs of Zn-bentonite/biochar is 90.51, higher than 88.08 and 76.99 for pure biochar and bentonite/biochar. The phosphorus leaching rate of Zn-bentonite/biochar is 62.38 percent, which is lower than 75.67 percent and 69.97 percent of pure biochar and bentonite/biochar.
Example 3
Pretreating cotton straws:
cutting fresh cotton stalk into 2-3cm slices, washing with water for several times, drying in oven at 105 deg.C for 48 hr, pulverizing with pulverizer, and sieving with 30 mesh sieve.
Mixing cotton straw, bentonite and Fe elements:
mixing cotton straw powder and bentonite in a ratio of 1-20:1-10 in 100mL of deionized water, and adding 0.2mol/L of FeSO4·7H2And O. The pH of the suspension is then adjusted to 10 with 5mol/L NaOH solution. The mixture was stirred at 600 rpm for 2h and then sonicated for 30 min. The mixture was dried in an oven at 80 ℃ for 48h and then ground through a 30 mesh screen.
Preparation of Fe-bentonite/biochar:
10g of the biomass mixed powder was put into a stoppered quartz tube connected to a vacuum pump through a plurality of gas scrubbers, and then co-pyrolysis was performed at a microwave power of 900W for a microwave time of 5 min. After pyrolysis the samples were cooled to room temperature. Washing with deionized water for 3 times, and drying in an oven at 105 deg.C for 24 hr to obtain Fe-bentonite/biochar.
R of Fe-bentonite/biochar50Values higher than 0.7, much higher than 0.475 and 0.566 for pure biochar and bentonite/biochar. The CRVs of Fe-bentonite/biochar was 111.97, higher than 88.08 and 76.99 for pure biochar and bentonite/biochar.
Example 4
Pretreating cotton straws:
cutting fresh cotton stalk into 2-3cm slices, washing with water for several times, drying in oven at 105 deg.C for 48 hr, pulverizing with pulverizer, and sieving with 100 mesh sieve.
Mixing cotton straw, bentonite and Fe elements:
mixing cotton straw powder and bentonite in a ratio of 1:10 in 100mL of deionized water, and adding 1.0mol/L FeSO4·7H2And O. The pH of the suspension is then adjusted to 10 with 5mol/L NaOH solution. The mixture was stirred at 600 rpm for 2h and then sonicated for 30 min. The mixture was dried in an oven at 80 ℃ for 48h and then ground through a 100 mesh screen.
Preparation of Fe-bentonite/biochar:
10g of the biomass mixed powder was put into a stoppered quartz tube connected to a vacuum pump through a plurality of gas scrubbers, and then co-pyrolysis was performed at a microwave power of 100W for a microwave time of 60 min. After pyrolysis the samples were cooled to room temperature. Washing with deionized water for 3 times, and drying in an oven at 105 deg.C for 24 hr to obtain Fe-bentonite/biochar.
R of Fe-bentonite/biochar50Values higher than 0.7, much higher than 0.475 and 0.566 for pure biochar and bentonite/biochar. The CRVs of Fe-bentonite/biochar was 107.38, higher than 88.08 and 76.99 for pure biochar and bentonite/biochar.
Example 5
Pretreating cotton straws:
cutting fresh cotton stalk into 2-3cm slices, washing with water for several times, drying in oven at 105 deg.C for 48 hr, pulverizing with pulverizer, and sieving with 80 mesh sieve.
Mixing cotton straw, bentonite and Mn elements:
mixing cotton straw powder and bentonite in a ratio of 1-20:1-10 in 100mL of deionized water, and adding 0.2mol/L MnSO4·H2And O. The pH of the suspension is then adjusted to 10 with 5mol/L NaOH solution. The mixture was stirred at 600 rpm for 2h and then sonicated for 30 min. The mixture was dried in an oven at 80 ℃ for 48h and then ground through an 80 mesh screen.
Preparation of Mn-bentonite/biochar:
10g of the biomass mixed powder was put into a stoppered quartz tube connected to a vacuum pump through a plurality of gas scrubbers, and then co-pyrolysis was performed at a microwave power of 500W for a microwave time of 40 min. After pyrolysis the samples were cooled to room temperature. Washing with deionized water for 3 times, and drying in an oven at 105 deg.C for 24 hr to obtain Mn-bentonite/biochar.
R of Mn-bentonite/biochar50Values above 0.7, well above 0.475 and 0.566 for pure biochar and bentonite/biochar. The CRVs of Mn-bentonite/biochar is 103.77, higher than 88.08 and 76.99 for pure biochar and bentonite/biochar. The phosphorus leaching rate of Mn-bentonite/biochar is 38.27%, which is lower than 75.67% and 69.97% of pure biochar and bentonite/biochar
Example 6
Pretreating cotton straws:
cutting fresh cotton stalk into 2-3cm slices, washing with water for several times, drying in oven at 105 deg.C for 48 hr, pulverizing with pulverizer, and sieving with 60 mesh sieve.
Mixing cotton straw, bentonite and Mn elements:
mixing cotton straw powder and bentonite in a ratio of 20:1 in 100mL of deionized water, and adding 0.8mol/L MnSO4·H2And O. The pH of the suspension is then adjusted to 10 with 5mol/L NaOH solution. The mixture was stirred at 600 rpm for 2h and then sonicated for 30 min. The mixture was dried in an oven at 80 ℃ for 48h and then ground through a 60 mesh screen.
Preparation of Mn-bentonite/biochar:
10g of the biomass mixed powder was put into a stoppered quartz tube connected to a vacuum pump through a plurality of gas scrubbers, and then co-pyrolysis was performed at a microwave power of 500W for a microwave time of 20 min. After pyrolysis the samples were cooled to room temperature. Washing with deionized water for 3 times, and drying in an oven at 105 deg.C for 24 hr to obtain Mn-bentonite/biochar.
R of Mn-bentonite/biochar50Values above 0.7, well above 0.475 and 0.566 for pure biochar and bentonite/biochar. The CRVs of Mn-bentonite/biochar is 108.95, higher than 88.08 and 76.99 for pure biochar and bentonite/biochar. The phosphorus leaching rate of Mn-bentonite/biochar is 32.77 percent, which is lower than 75.67 percent and 69.97 percent of pure biochar and bentonite/biochar
The method for preparing the biochar by co-pyrolyzing the bentonite and the metal solves the problems of poor stability and unsatisfactory slow release effect of the biochar in the prior art, thereby improving the soil improvement effect, improving the utilization rate of plants on nutrient substances and the carbon fixation effect and having good economic and environmental benefits. Therefore, the utilization rate of the plants to nutrient substances is improved, the carbon fixation efficiency is improved, good economic and environmental benefits are achieved, the carbon content in the bentonite/biochar is reduced due to the existence of Zn, Fe and Mn in the pyrolysis process, and the oxidation resistance of the biochar is improved. In addition, the charcoal prepared by co-pyrolysis of the trace elements and the bentonite/biomass has good phosphorus leaching resistance.
Claims (9)
1. A method for preparing biochar by co-pyrolyzing bentonite and metal is characterized by comprising the following steps:
step 1, pretreatment of biomass: cutting fresh cotton straw into pieces, washing with water for multiple times, drying in a drying oven at 105 ℃ for 48h, then crushing by a crusher, and sieving by a sieve of 10-100 meshes;
step 2, mixing the pretreated biomass with bentonite and trace elements: mixing cotton straw powder and bentonite in deionized water, and adding ZnSO respectively4·7H2O、FeSO4·7H2O and MnSO4·H2O; then adjusting the pH value of the suspension to 10 by using NaOH solution; stirring the mixture for 2 hours at the rotating speed of 600 revolutions per minute, and then carrying out ultrasonic treatment for 30 min; drying the mixture in an oven at 80 ℃ for 48h, and then grinding and sieving the mixture by a sieve with 10-100 meshes to obtain biomass mixed powder;
step 3, preparation of trace element mediated bentonite/biochar: putting the biomass mixed powder obtained in the step 2 into a quartz tube with a plug, connecting the quartz tube with the plug to a vacuum pump through a plurality of gas washers, then carrying out co-pyrolysis under the microwave heating condition, cooling a sample to room temperature after pyrolysis is finished, washing the sample for 3 times by deionized water, and then drying the sample in an oven at 105 ℃ for 24 hours to obtain microelement-mediated bentonite/biochar, wherein biochar markers of Zn-bentonite/biochar, Fe-bentonite/biochar and Mn-bentonite/biochar prepared by adding different microelements are used for completing the preparation of the biochar.
2. The method for preparing biochar by co-pyrolyzing bentonite and metal according to claim 1, wherein the cotton straw in the step 1 is cut into pieces with the length of 2-3 cm.
3. The method for preparing biochar by co-pyrolyzing bentonite and metal according to claim 1, wherein the mass ratio of the cotton straw powder to the bentonite in the step 2 is 1-20: 1-10.
4. The method for preparing biochar by co-pyrolyzing bentonite and metal according to claim 1, wherein the deionized water in the step 2 is 100 mL.
5. The method for preparing biochar by co-pyrolyzing bentonite and metal according to claim 1, wherein ZnSO is adopted in the step 24·7H2O、FeSO4·7H2O and MnSO4·H2The concentration of O is 0.1-1.0 mol/L.
6. The method for preparing biochar by co-pyrolyzing bentonite and metal according to claim 1, wherein the NaOH concentration in the step 2 is 5 mol/L.
7. The method for preparing biochar by co-pyrolyzing bentonite and metal according to claim 1, wherein the amount of the biomass mixed powder added in the step 3 is 10 g.
8. The method for preparing biochar by co-pyrolyzing bentonite and metal as claimed in claim 1, wherein the microwave power in step 3 is 100-900W, and the microwave time is 5-60 min.
9. The method for preparing biochar by co-pyrolyzing bentonite and metal according to claim 1, wherein the vacuum degree in the pyrolysis process in the step 3 is kept at 0.08 MPa.
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| CN116102379A (en) * | 2023-02-23 | 2023-05-12 | 昆明理工大学 | Method for preparing controlled release fertilizer by calcining sandy waste soil coupled with biomass |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107254313A (en) * | 2017-06-29 | 2017-10-17 | 中南大学 | As polluted soil passivator and preparation method, the method for administering As polluted soil |
| CN109317099A (en) * | 2018-11-06 | 2019-02-12 | 广东广垦畜牧工程研究院有限公司 | A kind of preparation method and application of load iron pig manure charcoal |
| CN109608248A (en) * | 2019-01-28 | 2019-04-12 | 西安工程大学 | A kind of charcoal composite bentonite base phosphorus potassium slow release fertilizer and preparation method thereof |
| CN109847693A (en) * | 2018-12-17 | 2019-06-07 | 石河子大学 | A kind of bentonite modified charcoal and its preparation method and application |
| CN109939643A (en) * | 2019-04-09 | 2019-06-28 | 西安工业大学 | α-Fe2O3Adulterate the preparation method and applications of charcoal |
| CN110064369A (en) * | 2019-05-28 | 2019-07-30 | 江西农业大学 | A kind of preparation method and applications of charcoal supported nano-gold metal particles |
| CN110240141A (en) * | 2019-06-28 | 2019-09-17 | 浙江省农业科学院 | A method of improving charcoal carbon withholding rate and stability |
| CN110918060A (en) * | 2019-12-16 | 2020-03-27 | 扬州大学 | Pyrolytic carbon-loaded zero-valent iron composite material and preparation method and application thereof |
| CN110980858A (en) * | 2019-11-25 | 2020-04-10 | 中国科学技术大学 | Preparation method and application of biochar-loaded nano zero-valent iron sulfide material |
| CN111085170A (en) * | 2019-12-26 | 2020-05-01 | 中国电建集团中南勘测设计研究院有限公司 | Biochar adsorbing material and application 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 |
-
2021
- 2021-02-09 CN CN202110177108.8A patent/CN113004902A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107254313A (en) * | 2017-06-29 | 2017-10-17 | 中南大学 | As polluted soil passivator and preparation method, the method for administering As polluted soil |
| 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 |
| CN109317099A (en) * | 2018-11-06 | 2019-02-12 | 广东广垦畜牧工程研究院有限公司 | A kind of preparation method and application of load iron pig manure charcoal |
| CN109847693A (en) * | 2018-12-17 | 2019-06-07 | 石河子大学 | A kind of bentonite modified charcoal and its preparation method and application |
| CN109608248A (en) * | 2019-01-28 | 2019-04-12 | 西安工程大学 | A kind of charcoal composite bentonite base phosphorus potassium slow release fertilizer and preparation method thereof |
| CN109939643A (en) * | 2019-04-09 | 2019-06-28 | 西安工业大学 | α-Fe2O3Adulterate the preparation method and applications of charcoal |
| CN110064369A (en) * | 2019-05-28 | 2019-07-30 | 江西农业大学 | A kind of preparation method and applications of charcoal supported nano-gold metal particles |
| CN110240141A (en) * | 2019-06-28 | 2019-09-17 | 浙江省农业科学院 | A method of improving charcoal carbon withholding rate and stability |
| CN110980858A (en) * | 2019-11-25 | 2020-04-10 | 中国科学技术大学 | Preparation method and application of biochar-loaded nano zero-valent iron sulfide material |
| CN110918060A (en) * | 2019-12-16 | 2020-03-27 | 扬州大学 | Pyrolytic carbon-loaded zero-valent iron composite material and preparation method and application thereof |
| CN111085170A (en) * | 2019-12-26 | 2020-05-01 | 中国电建集团中南勘测设计研究院有限公司 | Biochar adsorbing material and application thereof |
Non-Patent Citations (4)
| Title |
|---|
| ALBA DIEGUEZ-ALONSO ETAL.: ""Designing biochar properties through the blending of biomass feedstock with metals: Impact on oxyanions adsorption behavior"", 《CHEMOSPHERE》 * |
| KANGNING XU ET AL.: ""Optimizing the modification of wood waste biochar via metal oxides to remove and recover phosphate from human urine"", 《ENVIRON GEOCHEM HEALTH》 * |
| MINGHAO SHEN ET AL.: ""Extraneous Fe Increased the Carbon Retention of Sludge‑Based"", 《BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY》 * |
| MOHAMED BADR A ET AL.: ""Engineered biochar from microwave-assisted catalytic pyrolysis of switchgrass for increasing water-holding capacity and fertility of sandy soil"", 《SCIENCE OF THE TOTAL ENVIRONMENT》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116102379A (en) * | 2023-02-23 | 2023-05-12 | 昆明理工大学 | Method for preparing controlled release fertilizer by calcining sandy waste soil coupled with biomass |
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