CN114210309B - Biochar repairing agent and application thereof in marine heavy metal pollution - Google Patents
Biochar repairing agent and application thereof in marine heavy metal pollution Download PDFInfo
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- 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
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
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- 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
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- 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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28057—Surface area, e.g. B.E.T specific surface area
- B01J20/28061—Surface area, e.g. B.E.T specific surface area being in the range 100-500 m2/g
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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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
- C02F2101/10—Inorganic compounds
- 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
Abstract
The invention discloses a biochar restoration agent and application thereof in marine heavy metal pollution, and belongs to the field of marine pollution treatment. The preparation method of the biochar repairing agent specifically comprises the following steps: firstly, drying banana peel, sieving to prepare banana peel powder, then adding propane Shu Liuan, mixing, stirring and drying, putting into a muffle furnace for pyrolysis, cooling, taking out, washing with deionized water, and drying to obtain the biochar repairing agent. The biochar restoration agent prepared by the method has large specific surface area and greatly improved pore volume, and has excellent adsorption performance on marine heavy metals and organic dyes.
Description
Technical Field
The invention belongs to the field of ocean pollution control, and particularly relates to a biochar repairing agent and application thereof in ocean heavy metal pollution.
Background
The biochar is also called biomass charcoal, and refers to a highly aromatic solid product rich in carbon prepared by pyrolysis of waste biomass such as crop waste, municipal waste, animal waste and the like under anoxic or micro-aerobic conditions, and belongs to black charcoal in a broad sense. It is estimated that the total biomass energy in China can be used for developing and utilizing standard coal with the partial equivalent of about seven hundred million tons. Along with the development of agriculture and forestry, the biomass resources available in China are gradually increased, and the biomass resources have great development and utilization potential in the future. Different biomass raw materials generate biochar with diversified physicochemical properties under different pyrolysis temperatures, pyrolysis technologies and pyrolysis conditions. Due to the heterogeneity of these properties of biochar, biochar has great potential for application in soil improvement, greenhouse gas emission reduction, and contaminated environment remediation. Research shows that biochar has developed pore structure, contains great amount of functional groups and negative charges on the surface, has strong adsorption and immobilization capacity on heavy metal ions, and is applied to repair polluted soil and water. Because biochar is a rough carbon-rich material, the biochar has complex physicochemical properties, is difficult to have outstanding chemical functional properties, is limited in environmental application and needs to be further improved.
Therefore, researchers have focused on modifying biochar to change its structure and surface characteristics, thereby improving the repair function and improving the environmental friendly effect, and in general, the modified biochar material can improve the adsorption capacity of the original biochar and the potential for environmental repair applications.
Disclosure of Invention
The invention aims to provide a biochar repairing agent and application thereof in marine heavy metal pollution. According to the method, the biochar repairing agent is modified by the polypropylene Shu Liuan, so that the specific surface area and the pore volume of the biochar repairing agent are increased, and the method has better adsorption performance on marine heavy metals.
The technical scheme adopted by the invention for achieving the purpose is as follows:
the preparation method of the biochar repairing agent comprises the following steps:
taking banana peel powder as biomass, and adopting propane Shu Liuan to prepare the charcoal repairing agent through pyrolysis reaction in a nitrogen atmosphere; wherein the mass ratio of the banana peel powder to the prosulfiamine is 1:0.1-0.3.
Specifically, the preparation method of the biochar restoration agent comprises the following steps:
cleaning banana peel with deionized water, drying, crushing and sieving to obtain banana peel powder for later use;
adding banana peel powder into 20-30wt% of propyl Shu Liuan solution, mixing and stirring, and drying in an oven;
then placing the mixture into a muffle furnace for pyrolysis under the nitrogen atmosphere, naturally cooling to room temperature, and taking out;
repeatedly cleaning with deionized water, and drying in an oven to obtain the biochar repairing agent.
The invention provides a preparation method of a biochar repairing agent, which takes banana peel as a biomass raw material, utilizes propane Shu Liuan to modify the biomass raw material through pyrolysis reaction in nitrogen atmosphere, introduces active groups into the biochar repairing agent, increases the specific surface area and pore volume of the biochar repairing agent, possibly adds propane Shu Liuan in the preparation process of the biochar repairing agent, has beneficial effects on the structure of the biochar, changes the pore diameter structure of the biochar, and further improves the adsorption performance of the biochar repairing agent; simultaneously, the hydroxyl, amino, carbon-oxygen double bond and the like in the biological carbon repairing agent are all improved, the hydrogen bond acting force and the electrostatic attraction effect are enhanced, the adsorption effect of the biological carbon repairing agent on marine heavy metals is further improved, and the biological carbon repairing agent is especially suitable for Pb 2+ 、Cd 2+ 、Cu 2+ The adsorption capacity of (2) is significantly enhanced.
According to an embodiment of the present invention, the mixing and stirring conditions are: stirring speed is 150-200r/min, and stirring time is 4-5h.
According to an embodiment of the present invention, the drying conditions after mixing and stirring are: the temperature is 105-110 ℃ and the time is 10-12h.
According to an embodiment of the invention, the throughput of nitrogen is 20-50mL/min.
According to an embodiment of the invention, the pyrolysis conditions are: the temperature rising rate is 5-8 ℃/min, the reaction temperature is 550-650 ℃ and the time is 2-3h.
According to the embodiment of the invention, the specific surface area of the biochar restoration agent is more than or equal to 73.78m 2 /g; preferably, the specific surface area of the biochar restoration agent is more than or equal to 202.51m 2 /g。
More preferably, the esculetin is added in the preparation process of the biochar restoration agent; the mass ratio of banana peel powder to esculetin is 1:0.05-0.1.
Specifically, the preparation method of the biochar repairing agent comprises the following steps: dissolving esculetin in ethanol at concentration of 0.01-0.02g/mL, adding banana peel powder, mixing, stirring, drying, and pyrolyzing to obtain biochar repairing agent.
According to the invention, the aescine is added in the preparation process of the biochar restoration agent, so that the obtained biochar restoration agent has a good effect of removing organic dye in wastewater, and when the propium Shu Liuan and the aescine act on the biochar restoration agent simultaneously, the prepared biochar restoration agent has large specific surface area and strong electrostatic adsorption capacity, and has better adsorption performance on marine heavy metal and organic dye.
The invention also discloses the biochar repairing agent prepared by the preparation method.
Pb of the biochar repair agent according to an embodiment of the present invention 2+ The saturated adsorption quantity is more than or equal to 10.5mg/g; cd (cadmium sulfide) 2+ Saturated adsorption quantity is more than or equal to 12.8mg/g; cu (Cu) 2+ Saturated adsorption quantity is more than or equal to 8.2mg/g; more preferably Pb 2+ The saturated adsorption quantity is more than or equal to 22.6mg/g; cd (cadmium sulfide) 2+ The saturated adsorption quantity is more than or equal to 27.2mg/g; cu (Cu) 2+ The saturated adsorption quantity is more than or equal to 20.9mg/g.
The invention also discloses application of the C Shu Liuan in enhancing the adsorption performance of the biochar restoration agent on marine heavy metals.
The invention also discloses application of the biochar restoration agent prepared by the preparation method in wastewater treatment and soil restoration.
The beneficial effects of the invention include:
the invention provides a preparation method of a biological carbon repairing agent, which utilizes propane Shu Liuan to modify the biological carbon repairing agent with banana peel, the number of functional groups in the biological carbon repairing agent is obviously increased, the acting force of hydrogen bonds and the acting force of static electricity are enhanced, the specific surface area and the pore volume are effectively increased, and the biological carbon repairing agent has a better adsorption effect on heavy metals in seawater. In addition, when the biological carbon repairing agent is compounded with the esculetin for use, the prepared biological carbon repairing agent has stronger adsorption removal performance on heavy metals, and the removal effect on organic dyes in wastewater is also obviously improved.
Therefore, the invention provides the biochar restoration agent and the application thereof in marine heavy metal pollution, and the biochar restoration agent prepared by the method has larger specific surface area and pore volume and better adsorption performance on marine heavy metals and organic dyes.
Drawings
FIG. 1 is an infrared spectrum of the biochar restoration agent prepared in example 1 and comparative example 1;
FIG. 2 is a graph showing the results of a test of the saturated adsorption amount of heavy metal ions by the biochar restoration agent;
FIG. 3 shows the results of a test of the saturated adsorption amount of organic dye by the biochar restoration agent.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the specific embodiments and the attached drawings:
example 1:
a preparation method of a biochar repairing agent comprises the following steps:
cleaning banana peel with deionized water, drying, crushing, and sieving with a 0.2mm sieve to obtain banana peel powder for later use;
adding banana peel powder into a 20wt% propane Shu Liuan solution, mixing and stirring at a speed of 200r/min for 4 hours, and then placing into a 105 ℃ oven for 12 hours;
then putting the mixture into a muffle furnace to carry out pyrolysis under the nitrogen flux atmosphere of 50mL/min, and naturally cooling to room temperature and taking out the mixture after pyrolysis; wherein, the temperature rising rate of the muffle furnace is 5 ℃/min, the reaction temperature is 600 ℃ and the time is 2h;
repeatedly cleaning with deionized water, and drying in an oven to obtain the biochar repairing agent;
wherein the mass ratio of the banana peel powder to the prosulfiamine is 1:0.2.
Example 2:
the preparation method of the biochar restoration agent is different from that of the embodiment 1: the mass ratio of the banana peel powder to the prosulfiamine is 1:0.1.
Example 3:
the preparation method of the biochar restoration agent is different from that of the embodiment 1: the mass ratio of the banana peel powder to the prosulfiamine is 1:0.3.
Example 4:
a preparation method of a biochar repairing agent comprises the following steps:
cleaning banana peel with deionized water, drying, crushing, and sieving with a 0.2mm sieve to obtain banana peel powder for later use;
adding banana peel powder into a 20wt% propane Shu Liuan solution, adding 0.01g/mL aescine ethanol solution, mixing and stirring at a speed of 200r/min for 4h, and then placing in a 105 ℃ oven for drying for 12h;
then putting the mixture into a muffle furnace to carry out pyrolysis under the nitrogen flux atmosphere of 50mL/min, and naturally cooling to room temperature and taking out the mixture after pyrolysis; wherein, the temperature rising rate of the muffle furnace is 5 ℃/min, the reaction temperature is 600 ℃ and the time is 2h;
repeatedly cleaning with deionized water, and drying in an oven to obtain the biochar repairing agent;
wherein, the mass ratio of the banana peel powder to the prosulfiamine is 1:0.2; the mass ratio of the banana peel powder to the esculetin is 1:0.05.
Example 5:
the preparation method of the biochar restoration agent is different from that of example 4: the preparation process does not add the procaterol solution.
Example 6:
a preparation method of a biochar repairing agent comprises the following steps:
cleaning banana peel with deionized water, drying, crushing, and sieving with a 0.2mm sieve to obtain banana peel powder for later use;
adding banana peel powder into 0.02g/mL of aescine ethanol solution, mixing and stirring at the speed of 200r/min for 4 hours, and then placing into a 105 ℃ oven for drying for 12 hours;
then putting the mixture into a muffle furnace to carry out pyrolysis under the nitrogen flux atmosphere of 50mL/min, and naturally cooling to room temperature and taking out the mixture after pyrolysis; wherein, the temperature rising rate of the muffle furnace is 5 ℃/min, the reaction temperature is 600 ℃ and the time is 2h;
repeatedly cleaning with deionized water, and drying in an oven to obtain the biochar repairing agent;
wherein the mass ratio of banana peel powder to esculetin is 1:0.08.
Comparative example 1:
the preparation method of the biochar restoration agent is different from that of the embodiment 1: the preparation process does not add the procaterol solution.
Test example 1:
characterization of biochar repair agent performance
1. Infrared spectrogram of biochar repairing agent
Testing FTIR spectrum of the biochar repairing agent by using a Nicolet 6700 type Fourier infrared spectrometer (Thermomo Fisher, america), and tabletting by using KBr, wherein the testing wave number range is 4000-500 cm -1 。
The above test was performed on the charcoal repairing agent prepared in example 1 and comparative example 1, and the test results are shown in fig. 1. Analysis of FIG. 1 shows that the infrared spectrum of the charcoal repairing agent prepared in example 1 is 1410cm in comparison with the charcoal repairing agent prepared in comparative example 1 -1 The peak at the position is a strengthening peak caused by C-H bond bending vibration; 1632cm -1 A characteristic absorption peak for a c=n bond; 3462cm -1 Is a characteristic absorption peak of O-H; 3250cm -1 The reinforced adsorption peak of N-H bond is positioned; 1090cm -1 A reinforced absorption peak with C-S bond; the biochar repairing agent contains the prosulfiamine.
2. Elemental composition
The C, H, N, S content of the biochar repair agent samples was quantitatively analyzed using an elemental analyzer (vario EL iii CHNO, germany).
TABLE 1 elemental analysis
The above-described test was performed on the charcoal repairing agent prepared in example 1, example 4 and comparative example 1, and the test results are shown in table 1. As can be seen from table 1, the N, S content in example 1 is significantly increased compared with comparative example 1, which illustrates that the biochar restoration agent prepared in example 1 contains propyl Shu Liuan; the C, H content of example 4 was significantly increased relative to example 1, indicating that the biochar prepared in example 4 contained escin.
3. Specific surface area, pore volume and pore diameter of biochar repairing agent
The specific surface area, pore volume and pore diameter of the biochar restoration agent sample are measured by using a Kubo-X1000 specific surface area and pore diameter analyzer.
TABLE 2 specific surface area, pore volume and pore size of biochar
The biochar restoration agents prepared in example 1, example 4, example 5 and comparative example 1 were subjected to the above-described test, and the test results are shown in table 2. As can be seen from table 2, the specific surface area and pore volume of example 1 are about 2 times that of comparative example 1, indicating that the addition of propane Shu Liuan increases the specific surface area and pore volume of the biochar restoration agent; example 5 has less effect on the specific surface area and pore volume of the biochar restoration agent than comparative example 1, indicating that the addition of escin has no negative effect on the biochar restoration agent; compared with the embodiment 5 and the embodiment 1, the specific surface area and the pore volume of the biological carbon repairing agent are obviously increased in the embodiment 4, which indicates that the specific surface area and the pore volume of the biological carbon repairing agent are greatly increased when the esculentoside and the propane Shu Liuan are simultaneously added, and the pore structure improvement effect of the biological carbon repairing agent is better when the esculentoside and the propane sultiamine are compounded for use.
4. Heavy metal ion adsorption experiment
Lead adsorption experiment: by usingPb-containing lead nitrate preparation mass concentration of 1000mg/L 2+ Diluting the solution, and respectively weighing 50mL of Pb with concentration of 100mg/L, 200mg/L, 400mg/L, 600mg/L, 800mg/L and 1000mg/L 2+ The solution was placed in a centrifuge tube, 0.1g of a sample of the charcoal repairing agent was added, and then the centrifuge tube was placed in an incubator and shaken at 30℃for 5 hours under 200 r/min. Sampling the sample after the adsorption experiment, and passing through microporous water system filter membrane to obtain Pb-containing material 2+ Then measuring Pb in the filtrate by using an absorption photometer 2+ Is a concentration of (3). The adsorption equilibrium model is usually a Langmuir adsorption model and a Freundlich adsorption model, and the formula is as follows:
langmuir equation: q (Q) e =bQ m C e /(1+bC e )
Freundlich equation: lnQ e =lnK f +（lnC e ）/n
Wherein C is e For adsorbing Pb in solution at equilibrium 2+ Concentration (mg/L); q (Q) e The adsorption amount (mg/g) at adsorption equilibrium; q (Q) m Maximum adsorption (mg/g); b is a parameter (L/mg) characterizing the affinity between the adsorbent and the adsorbate; k (K) f Adsorption capacity (mg/g) for Freundlich; n is the Freundlich constant.
Adsorption test of cadmium: cadmium chloride is used for preparing Cd with mass concentration of 1000mg/L 2+ Diluting the solution, and taking 50mL of Cd with the concentration of 10mg/L, 20mg/L, 30mg/L, 40mg/L, 60mg/L and 80mg/L respectively 2+ The solution is put into a centrifuge tube, and the rest operation is the same as Pb 2+ Adsorption experiments of (a).
Copper adsorption test: cu-containing copper chloride with mass concentration of 1000mg/L 2+ Diluting the solution, and collecting 50mL Cu with concentration of 20mg/L, 40mg/L, 60mg/L, 80mg/L, 100mg/L and 150mg/L 2+ The solution is put into a centrifuge tube, and the rest operation is the same as Pb 2+ Adsorption experiments of (a).
The biochar restoration agents prepared in example 1, example 4, example 5 and comparative example 1 were subjected to the above-described test, and the test results are shown in fig. 2. As can be seen from fig. 2, in example 1, the saturated adsorption amount of metal ions was increased compared with comparative example 1, which indicates that the adsorption amount of metal ions by the biochar restoration agent was enhanced when propane Shu Liuan was added; example 5 is comparable to comparative example 1, demonstrating that the addition of esculentoside to the biochar repair agent does not negatively affect the amount of metal ion adsorbed; example 4 showed a significant increase in the adsorption capacity of metal ions compared to examples 1 and 5, indicating that the adsorption capacity of the biochar restoration agent on metal ions was significantly enhanced when escin was added simultaneously with propane Shu Liuan.
5. Adsorption performance of biochar repairing agent on organic dye
Respectively placing 0.1g of charcoal sample into a centrifuge tube, adding 40mL of methylene blue or sunset yellow solution, oscillating for 5h at 25deg.C and 150r/min, taking out, standing for 10min, collecting supernatant, passing through PTFE needle filter, and respectively measuring sunset yellow and methylene blue concentration at 481nm (or 670 nm) by using spectrophotometer. The adsorption equilibrium model is usually a Langmuir adsorption model and a Freundlich adsorption model, and the formula is as follows:
langmuir equation: q (Q) e =bQ m C e /(1+bC e )
Freundlich equation: lnQ e =lnK f +（lnC e ）/n
Wherein C is e Concentration (mg/L) of methylene blue or sunset yellow solution at adsorption equilibrium; q (Q) e The adsorption amount (mg/g) at adsorption equilibrium; q (Q) m Maximum adsorption (mg/g); b is a parameter (L/mg), K, which characterizes the affinity between the adsorbent and the adsorbate f The adsorption capacity (mg/g) is Freundlich, and n is Freundlich constant.
The biochar restoration agents prepared in examples 1 to 5 and comparative example 1 were subjected to the above test, and the test results are shown in fig. 3. As can be seen from fig. 3, the adsorption effect of the charcoal repairing agent added in example 1 on the dye is increased compared with that in comparative example 1, which shows that the charcoal repairing agent added in propyl Shu Liuan has an effect of promoting the adsorption effect of the dye; the adsorption amount of the dye in the example 5 is also increased compared with that in the comparative example 1, which shows that the addition of the esculentide enhances the adsorption effect of the biochar restoration agent on the dye; example 4 showed a significant increase in the adsorption of the dye compared to examples 1 and 5, indicating that the biochar restoration agent has a better promoting effect on the adsorption of the dye when esculentide and propane Shu Liuan are added simultaneously.
The conventional technology in the above embodiments is known to those skilled in the art, and thus is not described in detail herein.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The preparation method of the biochar repairing agent comprises the following steps:
cleaning banana peel with deionized water, drying, crushing and sieving to obtain banana peel powder for later use;
adding banana peel powder into 20-30wt% of propyl Shu Liuan solution, mixing and stirring, and drying in an oven;
then placing the mixture into a muffle furnace for pyrolysis under the nitrogen atmosphere, naturally cooling to room temperature, and taking out;
repeatedly cleaning with deionized water, and drying in an oven to obtain the biochar repairing agent;
wherein the mass ratio of the banana peel powder to the prosulfiamine is 1:0.1-0.3.
2. The method for preparing the biochar restoration agent according to claim 1, wherein: the flux of the nitrogen is as follows: 20-50mL/min.
3. The method for preparing the biochar restoration agent according to claim 1, wherein: the pyrolysis conditions are as follows: the temperature rising rate is 5-8 ℃/min, the reaction temperature is 550-650 ℃ and the time is 2-3h.
4. The method for producing a biochar restoration agent according to claim 1, which is characterized in thatThe method is characterized in that: the specific surface area of the biochar repairing agent is more than or equal to 73.78m 2 /g。
5. The method for preparing the biochar restoration agent according to claim 1, wherein: the preparation method also comprises the step of adding aescine.
6. A biochar restoration agent produced according to the production method of claim 1 or claim 5.
7. The biochar restoration agent according to claim 6, wherein: pb of the biochar repair agent 2+ The saturated adsorption quantity is more than or equal to 10.5mg/g; cd (cadmium sulfide) 2+ Saturated adsorption quantity is more than or equal to 12.8mg/g; cu (Cu) 2+ The saturated adsorption quantity is more than or equal to 8.2mg/g.
8. The use of the biochar restoration agent prepared by the preparation method according to claim 1, which is characterized in that: the application of the C Shu Liuan in enhancing the adsorption performance of the biochar restoration agent on marine heavy metals.
9. Use of the biochar restoration agent prepared by the preparation method according to claim 1 in wastewater treatment and soil restoration.
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