NL2032059B1 - Modified Material of Biochar for Soil Remediation and its Preparation Method - Google Patents

Modified Material of Biochar for Soil Remediation and its Preparation Method Download PDF

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NL2032059B1
NL2032059B1 NL2032059A NL2032059A NL2032059B1 NL 2032059 B1 NL2032059 B1 NL 2032059B1 NL 2032059 A NL2032059 A NL 2032059A NL 2032059 A NL2032059 A NL 2032059A NL 2032059 B1 NL2032059 B1 NL 2032059B1
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modified
biocharcoal
soil
parts
biochar
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NL2032059A
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Dutch (nl)
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NL2032059A (en
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Xie Yumei
Gong Jing
Zong Dapeng
Xiang Ping
Zhang Mengyan
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Univ Southwest Forestry
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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
    • C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C11/00—Other nitrogenous fertilisers
    • 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
    • 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
    • C09K2101/00—Agricultural use

Abstract

Disclosed is a modified material of biochar for soil remediation, which comprises the following raw materials: biochar, humic acid, microbial inoculum, amino acid, ammoniated peat soil, diatomite, chitosan, activated carbon fibre, polyacrylamide, turfy soil, organic fertilizer, and sodium polyacrylate; the application also discloses a preparation method of the modified material, whereby soil amendment is improved by modifying biochar and soil fertility is improved by adding organic fertilizer in addition to reduced fertilizer application and saved production cost; the modified material provided by the present application is in line with the trend of energy-saving, environmental protection, and sustainable development as it does not cause soil barrenness, slabbing or salinisation.

Description

Modified Material of Biochar for Soil Remediation and its Preparation Method
TECHNICAL FIELD
The application relates to the technical field of soil amendments, and in particular to a modified material of biochar for soil remediation and its preparation method.
BACKGROUND
Soil is a key resource for human survival, a natural resource with a renewable function in the ecosystem as well as an important part of the agro-ecosystem. However, soils are polluted by heavy metals for the past years due to various human production activities, especially in agricultural soils; such pollutants are as harmful as air and water pollution due to stability and non-microbial degradation and mineralization of heavy metals, in addition to their long retention time. This increasingly significant problem of heavy metal pollution in soil not only poses a serious threat to human health and life safety, but also causes other environmental pollution problems, such as water and air pollution. Consequently, heavy metal pollution of soil has attracted widespread attention and its remediation and ecosystem restoration are very urgent.
Biochar, a type of aromatic carbon-enriched solid material, is produced by thermal cracking and charring of biomass (bio-organic material) at high temperatures under complete or partial anoxia; it contains trace metals and major nutrients and has good physical and chemical properties such as large porosity, large surface area and strong cation exchange capacity, which can interact with major nutrient cycles and facilitate the growth of microorganisms in the process of organic fertilizer application, whereas specific surface area and porosity are the main physical characteristics that affect the heavy metal adsorption capacity of biochar. Biochar is rich in functional groups and negative charges on its surface, and has a strong adsorption and fixation capacity for heavy metal ions, enabling it to improve the physicochemical properties of soil and reduce greenhouse gas emissions. It is a novel, economical, green, and resourceful heavy metal passivation and remediation material that can be used as high-quality energy, soil amendment, reducing agent, slow release carrier for fertilizers and carbon dioxide sequestering agent, etc., widely used in the fields of carbon sequestration and emission reduction, water purification, heavy metal adsorption and soil improvement, and so on.
Modified biochar, with its increased surface acidic functional groups, is able to chelate and adsorb bioavailable heavy metals, which is conducive to improving the adsorption capacity of soil for heavy metals, providing an additional safeguard for reducing the biological effectiveness of heavy metals in contaminated soil and facilitating the growth of replanted crops.
In the prior art, chemical or metal oxide modified biochar is adopted for soil amendment, which introduces potential pollutants into the soil and brings about possible environmental pollution.
Therefore, it is a pressing technical problem for those skilled in the art to provide a modified material of biochar for soil remediation and its preparation method that does not pollute the environment and delivers excellent soil remediation performance.
SUMMARY
Given that, it is an objective of the present application to provide a modified material of biochar for soil remediation and its preparation method, in which the biochar is modified by humic acid to achieve an improved remediation effect on the soil without causing pollution to the environment.
To achieve the above objective, the application adopts the following technical scheme: a modified material of biochar for soil remediation comprises the following raw materials in parts by weight: 30 - 45 parts of biochar, 60 - 80 parts of humic acid, 20 - 30 parts of microbial agents, 20 - 30 parts of agricultural and forestry wastes, 7 - 9 parts of amino acids, 6 - 8 parts of ammoniated peat soil, 12 - 13 parts of diatomite, 7 - 10 parts of chitosan and 5 - 8 parts of activated carbon fibre, 5 - 11 parts polyacrylamide, 4 - 6 parts turfy soil, 5 - 8 parts organic fertilizer, 8 - 12 parts sodium polyacrylate.
Preferably, the biochar is obtained by mixing firewood charcoal and straw charcoal with a mass ratio of 1: (2 - 3) between the firewood charcoal and straw charcoal.
According to the application, firewood and corn stalks are used to prepare the biochar, and the obtained biochar can effectively improve the soil.
Preferably, the microbial agent comprises photosynthetic bacteria, Bacillus pumilus,
Bacillus subtilis, and Pseudomonas aeruginosa, and the mass ratio of the photosynthetic bacteria, Bacillus pumilus, Bacillus subtilis, and Pseudomonas aeruginosa is 3: (2-4). (1-2). (4 - 5).
Preferably, the agricultural and forestry wastes include one or more bamboo charcoal, coconut shell, peanut shell, and walnut shell.
Another objective of the present application is to provide a preparation method for the above-mentioned modified material of biochar for soil remediation, which comprises the following steps: (1) preparation of biochar: stoving firewood to obtain firewood charcoal, then cutting corn stalks into 7 - 9 cm corn stalk segments, drying the corn stalk segments in the sun until the moisture content is less than 9% to obtain dried corn stalks, soaking the corn stalk segments in straw modifying liquid to obtain modified corn stalk segments, putting the modified corn stalk segments into a pyrolysis device for pyrolysis to obtain straw charcoal, and finally mixing the firewood charcoal and straw charcoal according to the mass ratio, grinding and sieving to obtain biochar powder; (2) modification of biochar:
adding humic acid into water to obtain a humic acid solution, adjusting its pH to 5.5 - 6.5, then placing the biochar powder and humic acid solution in a reaction container to mix evenly, and finally removing the solution to obtain modified biochar powder; (3) preparation of microbial agents: mixing Bacillus pumilus, Bacillus subtilis, and Pseudomonas aeruginosa according to the mass ratio, and uniformly stirring to obtain a mixed bacterial solution; mixing the mixed bacterial solution with photosynthetic bacteria, and uniformly stirring to obtain microbial inoculum; (4) preparation of organic fertilizer: grinding agricultural and forestry wastes, then putting them together with amino acids, ammoniated peat soil, diatomite, chitosan, activated carbon fibre, polyacrylamide, turfy soil, organic fertilizer, and sodium polyacrylate into a stirring device for mixing and stirring for 25 - 35 min under a rotating speed of 800 - 850 r/min, then obtaining the organic fertilizer; (5) preparation of modified material of biochar: mixing modified biochar powder, microbial inoculum, and organic fertilizer, followed by granulation in a granulator to obtain the modified material of biochar.
Preferably, the stoving in step (1) is carried out under temperature of 60 - 70°C with a duration of 15 - 30 h.
Preferably, the straw modifying liquid in step (1) is obtained by mixing tetrabutyl titanate, isopropanol, and nitric acid in a mass ratio of 5:18:1; the ratio of the corn straw segment to the straw modifying liquid is 1 kg: 2.0 - 3.0 I; the soaking duration is 70 - 90 min.
Preferably, the pyrolysis in step (1) is carried out at temperature of 510 - 540°C with a duration of 30 - 60 min.
Preferably, the humic acid solution in step (2) is in a concentration of 200 - 300 mg/l, and adjusting pH refers to adjusting the pH by 0.1 mol/l hydrochloric acid solution or 0.1 mol/l sodium hydroxide solution.
As can be seen from the technical schemes described above, the beneficial effects of the present application compared to the prior art are as follows: the modified material of biochar for soil remediation provided by the application is very convenient to use and can improve the quality of soil at a deep level after being mixed into the soil; soil amendment is effectively improved by modifying biochar, and soil fertility is improved at the same time by adding organic fertilizer to the improved materials in addition to the reduced application of chemical fertilizer as well as production cost; the material provided by the present application is in line with the trend of energy-saving, environmental protection, and sustainable development as it does not cause soil barrenness, slabbing or salinization.
DESCRIPTION OF THE INVENTION
The following technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, but not all of them. Based on the embodiment of the present application, all other embodiments obtained by ordinary technicians in the field without creative labour are within the scope of the present application.
Embodiment 1
A modified material of biochar for soil remediation comprises biochar 30 g, humic acid 60 g, microbial inoculum 20 g, agricultural and forestry wastes 20 g, amino acids 7 g, ammoniated peat soil 6 g, diatomite 12 g, chitosan 7 g, activated carbon fibre 5 g, polyacrylamide 5 g, turfy soil 4 g, organic fertilizer 5 g, and sodium polyacrylate 8 g.
Biochar is obtained by mixing firewood charcoal and straw charcoal with a mass ratio of 1:2.
The microbial inoculum includes photosynthetic bacteria, Bacillus pumilus, Bacillus subtilis, and Pseudomonas aeruginosa in a mass ratio of 3:2:1:4.
Embodiment 2
A modified material of biochar for soil remediation comprises biochar 45 g, humic acid 80 g, microbial inoculum 30 g, agricultural and forestry waste 30 g, amino acid 9 g, ammoniated peat soil 8 g, diatomite 13 g, chitosan 10 g, activated carbon fibre 8 g, polyacrylamide 11 g, turfy soil 6 g, organic fertilizer 8 g, and sodium polyacrylate 12 g.
Among them, biochar is obtained by mixing firewood charcoal and straw charcoal with a mass ratio of 1:3.
The microbial inoculum includes photosynthetic bacteria, Bacillus pumilus, Bacillus subtilis, and Pseudomonas aeruginosa in a mass ratio of 3:4:2:5.
Embodiment 3
A modified material of biochar for soil remediation comprises the following raw materials by weight: 37 g biochar, 70 g humic acid, 25 g microbial agent, 25 g agricultural and forestry waste, 8 g amino acid, 7 g ammoniated peat soil, 12 g diatomite, 8 g chitosan, 7 g activated carbon fibre, 8 g polyacrylamide, 5 g turfy soil, 6 g organic fertilizer and 10 g sodium polyacrylate.
Among them, biochar is obtained by mixing firewood charcoal and straw charcoal with a mass ratio of 1:2.
The microbial inoculum includes photosynthetic bacteria, Bacillus pumilus, Bacillus subtilis, and Pseudomonas aeruginosa in a mass ratio of 3:2:2:4.
Embodiment 4
The preparation method of modified material of biochar for soil remediation in Embodiments 1 - 3 includes the following steps: (1) preparation of biochar:
stoving firewood at 60°C for 30 h to obtain firewood charcoal, then cutting corn stalks into 9 cm corn stalk segments, drying the corn stalk segments in the sun until the moisture content is less than 9% to obtain dried corn stalks, soaking the corn stalk segments in straw modifying liquid for 70 min to obtain modified corn stalk segments, putting the modified corn stalk 5 segments into a pyrolysis device for pyrolysis under 510°C for 60 min to obtain straw charcoal, and finally mixing the firewood charcoal and straw charcoal according to the mass ratio, grinding and sieving to obtain biochar powder; the straw modifying liquid is obtained by mixing tetrabutyl titanate, isopropanol, and nitric acid in a mass ratio of 5:18:1; the ratio of corn stalk to straw modifying liquid is 1 kg:2.0 |; (2) modification of biochar: adding humic acid into water, preparing 200 mg/l humic acid solution, adjusting its pH to 5.5, then placing the biochar powder and humic acid solution in a reaction container, uniformly mixing, and finally removing the solution to obtain modified biochar powder; (3) preparation of microbial agents: mixing Bacillus pumilus, Bacillus subtilis, and Pseudomonas aeruginosa according to the mass ratio, and uniformly stirring to obtain a mixed bacterial solution; mixing the mixed bacterial solution with photosynthetic bacteria, and uniformly stirring to obtain microbial inoculum; (4) preparation of organic fertilizer: grinding agricultural and forestry wastes, and then putting them together with amino acids, ammoniated peat soil, diatomite, chitosan, activated carbon fibre, polyacrylamide, turfy soil, organic fertilizer, and sodium polyacrylate into a stirring device for mixing and stirring for 35 min under a rotating speed of 800 r/min, then obtaining the organic fertilizer; (5) preparation of modified material of biochar: mixing the modified biochar powder, microbial inoculum, and organic fertilizer, and placing them in a granulator for granulation to obtain the modified material of biochar.
Embodiment 5
The preparation method of modified material of biochar for soil remediation in Embodiments 1 - 3 includes the following steps: (1) preparation of biochar: stoving firewood at 70°C for 15 h to obtain firewood charcoal, then cutting corn stalks into 7 cm corn stalk segments, drying the corn stalk segments in the sun until the moisture content is less than 9% to obtain dried corn stalks, soaking the corn stalk segments in straw modifying liquid for 90 min to obtain modified corn stalk segments, putting the modified corn stalk segments into a pyrolysis device for pyrolysis under 540°C for 30 min to obtain straw charcoal, and finally mixing the firewood charcoal and straw charcoal according to the mass ratio, grinding and sieving to obtain biochar powder;
the straw modifying liquid is obtained by mixing tetrabutyl titanate, isopropanol, and nitric acid in a mass ratio of 5:18:1; the ratio of corn stalk to straw modifying liquid is 1 kg:3.0 |; (2) modification of biochar: adding humic acid into water, preparing 300 mg/l humic acid solution, adjusting its pH to 6.5, then placing the biochar powder and humic acid solution in a reaction container, uniformly mixing and finally removing the solution to obtain modified biochar powder; (3) preparation of microbial agents: mixing Bacillus pumilus, Bacillus subtilis, and Pseudomonas aeruginosa according to the mass ratio, and uniformly stirring to obtain a mixed bacterial solution; mixing the mixed bacterial solution with photosynthetic bacteria, and uniformly stirring to obtain microbial inoculum; (4) preparation of organic fertilizer: crushing agricultural and forestry wastes, and then putting into a stirring device together with amino acids, ammoniated peat soil, diatomite, chitosan, activated carbon fibre, polyacrylamide, turfy soil, organic fertilizer, and sodium polyacrylate for mixing and stirring for 25 min under a rotating speed of 850 r/min, then obtaining organic fertilizer; (5) preparation of modified material of biochar: mixing modified biochar powder, microbial inoculum, and organic fertilizer, and placing them in a granulator for granulation to obtain the modified material of biochar.
Comparative embodiment 1
The preparation method is the same as that of Embodiment 5, except that the modification of biochar is not carried out.
Comparing the modified material of biochar for soil remediation prepared in Embodiments 1 - 3 (made by the preparation method in Embodiment 5) with the modified material of biochar obtained in Comparative embodiment 1, the experimental data are shown in the following table:
EE embodiment 1
Heavy metal pollution
Percentage increase of
It can be seen from the above table that the modified material of biochar for soil remediation provided by the application can effectively remediate the soil, and biochar after modification can significantly enhance the remediation ability of heavy metal pollution in the soil, improving the soil and increasing soil fertility, with Embodiment 3 being the best embodiment.
The above description of the disclosed embodiments enables those skilled in the art to make or use the application.
Many modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application.
Therefore, the present application will not be limited to the embodiments shown herein but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

CONCLUSIESCONCLUSIONS 1. Een gemodificeerd materiaal van biohoutskool voor bodemsanering, dat de volgende grondstoffen in gewichtsdelen omvat: 30 - 45 delen biohoutskool, 60 - 80 delen humuszuur, 20 - 30 delen microbiële middelen, 20 - 30 delen land- en bosbouwafval, 7 - 9 delen aminozuren, 6 - 8 delen ammoniakhoudende veengrond, 12 - 13 delen diatomiet, 7 - 10 delen chitosan en 5 - 8 delen actieve koolstofvezel, 5 - 11 delen polyacrylamide, 4 - 6 delen turfgrond, 5 - 8 delen organische meststof, 8 - 12 delen natriumpolyacrylaat.1. A modified biocharcoal material for soil remediation, comprising the following raw materials in parts by weight: 30 - 45 parts biocharcoal, 60 - 80 parts humic acid, 20 - 30 parts microbial agents, 20 - 30 parts agricultural and forestry waste, 7 - 9 parts amino acids, 6 - 8 parts ammoniated peat soil, 12 - 13 parts diatomite, 7 - 10 parts chitosan and 5 - 8 parts activated carbon fiber, 5 - 11 parts polyacrylamide, 4 - 6 parts peat soil, 5 - 8 parts organic fertilizer, 8 - 12 parts sodium polyacrylate. 2. Het gemodificeerde materiaal van biohoutskool voor bodemsanering volgens conclusie 1, waarbij de biohoutskool wordt verkregen door het mengen van brandhoutskool en strohoutskool in een massaverhouding van 1 : (2 - 3).The modified biocharcoal material for soil remediation according to claim 1, wherein the biocharcoal is obtained by mixing fuel charcoal and straw charcoal in a mass ratio of 1: (2 - 3). 3. Het gemodificeerde materiaal van biohoutskool voor bodemsanering volgens conclusie 2, waarbij het microbiële middel fotosynthetische bacteriën, Bacillus pumilus, Bacillus subtilis, en Pseudomonas aeruginosa omvat in een massaverhouding van 3: {2 -4): (1-2): (4-5).The modified biocharcoal material for soil remediation according to claim 2, wherein the microbial agent comprises photosynthetic bacteria, Bacillus pumilus, Bacillus subtilis, and Pseudomonas aeruginosa in a mass ratio of 3: {2 -4): (1-2): (4 -5). 4. Het gemodificeerde materiaal van biohoutskool voor bodemsanering volgens conclusie 3, waarbij het land- en bosbouwafval een of meer bamboe houtskool, kokosnootschalen, pindaschalen, en walnootschalen omvat.The modified biocharcoal material for soil remediation according to claim 3, wherein the agricultural and forestry waste includes one or more bamboo charcoal, coconut shells, peanut shells, and walnut shells. 5. Een werkwijze voor de bereiding van het gemodificeerde materiaal van biohoutskool voor bodemsanering volgens conclusie 4, welke werkwijze de volgende stappen omvat: (1) voorbereiding van biohoutskool: stoken van brandhout om brandhoutskool te verkrijgen, vervolgens snijden van maïsstengels in maïsstengelsegmenten van 7 - 9 cm, drogen van de maïsstengelsegmenten in de zon tot het vochtgehalte minder dan 9% bedraagt om gedroogde maïsstengels te verkrijgen, weken van de maïsstengelsegmenten in stro- modificatievloeistof om gemodificeerde maïsstengelsegmenten te verkrijgen, plaatsen van de gemodificeerde maïsstengelsegmenten in een pyrolyseapparaat voor pyrolyse om strohoutskool te verkrijgen, en ten slotte in de massaverhouding mengen van de brandhoutskool en strohoutskool, malen en zeven om biohoutskoolspoeder te verkrijgen; (2) modificatie van biohoutskool: toevoegen van humuszuur aan water om een humuszuuroplossing te verkrijgen, aanpassen van de pH tot 5,5 - 6,5, vervolgens het plaatsen van biohoutskoolpoeder en de humuszuuroplossing in een reactievat om gelijkmatig te mengen, en ten slotte het wegnemen van de oplossing om gemodificeerd biohoutskoolpoeder te verkrijgen; (3) bereiding van microbiële middelen:A method for the preparation of the modified bio-charcoal material for soil remediation according to claim 4, which method comprises the following steps: (1) preparation of bio-charcoal: burning firewood to obtain fuel charcoal, then cutting corn stalks into corn stalk segments of 7 - 9 cm, drying the corn stalk segments in the sun until the moisture content is less than 9% to obtain dried corn stalks, soaking the corn stalk segments in straw modification liquid to obtain modified corn stalk segments, placing the modified corn stalk segments in a pyrolysis apparatus for pyrolysis to obtain straw charcoal to obtain, and finally mixing the fuel charcoal and straw charcoal in the mass ratio, grinding and sifting to obtain biocharcoal powder; (2) modification of biocharcoal: adding humic acid to water to obtain humic acid solution, adjusting the pH to 5.5 - 6.5, then placing biocharcoal powder and the humic acid solution into a reaction vessel to mix evenly, and finally removing the solution to obtain modified biocharcoal powder; (3) preparation of microbial agents: in de massaverhouding mengen van Bacillus pumilus, Bacillus subtilis en Pseudomonas aeruginosa, en gelijkmatig roeren om een gemengde bacteriële oplossing te verkrijgen; mengen van de gemengde bacteriële oplossing met fotosynthetische bacteriën, en gelijkmatig roeren om microbieel inoculum te verkrijgen; (4) voorbereiding van organische meststof: vermalen van land- en bosbouwafval, vervolgens samenbrengen met aminozuren, ammoniak houdende veengrond, diatomiet, chitosan, actieve koolstofvezel, polyacrylamide, turfgrond, organische meststof, en natriumpolyacrylaat in een roerapparaat om te mengen en te roeren gedurende 25 - 35 min bij een rotatiesnelheid van 800 - 850 omw/min, vervolgens het verkrijgen van de organische meststof; (5) voorbereiding van gemodificeerd materiaal van biohoutskool: mengen van gemodificeerd biohoutskoolpoeder, microbieel inoculum, en organische meststof, gevolgd door granulatie in een granulator om het gemodificeerde materiaal van biohoutskool te verkrijgen.mixing in the mass ratio of Bacillus pumilus, Bacillus subtilis and Pseudomonas aeruginosa, and stirring evenly to obtain a mixed bacterial solution; mixing the mixed bacterial solution with photosynthetic bacteria, and stirring evenly to obtain microbial inoculum; (4) preparation of organic fertilizer: grinding agricultural and forestry waste, then combining with amino acids, ammoniacal peat soil, diatomite, chitosan, activated carbon fiber, polyacrylamide, peat soil, organic fertilizer, and sodium polyacrylate in a stirrer to mix and stir for 25 - 35 min at a rotation speed of 800 - 850 rpm, then obtain the organic fertilizer; (5) preparation of modified biocharcoal material: mixing modified biocharcoal powder, microbial inoculum, and organic fertilizer, followed by granulation in a granulator to obtain the modified biocharcoal material. 6. De werkwijze voor de bereiding van het gemodificeerde materiaal van biohoutskool voor bodemsanering volgens conclusie 5, waarbij het stoven in stap (1) wordt uitgevoerd bij een temperatuur van 60 - 70°C gedurende 15 - 30 uur.The method for preparing the modified biocharcoal material for soil remediation according to claim 5, wherein the stewing in step (1) is carried out at a temperature of 60 - 70°C for 15 - 30 hours. 7. De werkwijze voor de bereiding van het gemodificeerde materiaal van biohoutskool voor bodemsanering volgens conclusie 5, waarbij de stro-modificatievloeistof in stap (1) wordt verkregen door het mengen van tetrabutyltitanaat, isopropanol en salpeterzuur in een massaverhouding van 5 : 18 : 1; waarbij de verhouding van het segment maisstro tot de stro- wijzigingsvloeistof 1 kg : 2,0 - 3,0 | is; en de weektijd 70 - 90 min bedraagt.The method for preparing the modified biocharcoal material for soil remediation according to claim 5, wherein the straw modification liquid in step (1) is obtained by mixing tetrabutyl titanate, isopropanol and nitric acid in a mass ratio of 5:18:1; where the ratio of the corn straw segment to the straw amendment liquid 1 kg: 2.0 - 3.0 | is; and the soaking time is 70 - 90 minutes. 8. De werkwijze voor de bereiding van het gemodificeerde materiaal van biohoutskool voor bodemsanering volgens conclusie 5, waarbij de pyrolyse in stap (1) wordt uitgevoerd bij een temperatuur van 510 - 540°C gedurende 30 - 60 min.The method for preparing the modified biocharcoal material for soil remediation according to claim 5, wherein the pyrolysis in step (1) is carried out at a temperature of 510 - 540°C for 30 - 60 min. 9. De werkwijze voor de bereiding van het gemodificeerde materiaal van biohoutskool voor bodemsanering volgens conclusie 5, waarbij de humuszuuroplossing in stap (2) een concentratie heeft van 200 - 300 mg/l; het aanpassen van pH verwijst naar het aanpassen van de pH met 0,1 mol/l zoutzuuroplossing of met 0,1 mol/l natriumhydroxideoplossing.The method for preparing the modified biocharcoal material for soil remediation according to claim 5, wherein the humic acid solution in step (2) has a concentration of 200 - 300 mg/l; adjusting pH refers to adjusting the pH with 0.1 mol/l hydrochloric acid solution or with 0.1 mol/l sodium hydroxide solution.
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