CN110699086A - Soil remediation agent with rice straw biomass charcoal as raw material and production method thereof - Google Patents
Soil remediation agent with rice straw biomass charcoal as raw material and production method thereof Download PDFInfo
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Abstract
The invention discloses a soil repairing agent with rice straw biomass charcoal as a raw material and a production method thereof, belonging to the technical field of polluted soil repairing, wherein the soil repairing agent with rice straw biomass charcoal as a raw material comprises the following raw materials in percentage by mass: 45% -55% of rice straw biomass charcoal; 20% -30% of polyhydroxy ferric phosphate; 20-30% of amino hydroxyl ferric oxide loaded with chitosan; the soil remediation agent is prepared by uniformly mixing rice straw biomass charcoal, polyhydroxy ferric phosphate and chitosan-loaded amino hydroxyl ferric oxide, and mixing the materials by a stirring system, so that the bioavailability of Cd and Pb is reduced, the Cd and Pb are promoted to be converted to a more stable state, the soil remediation agent can adapt to the properties of soil, the remediation pollution is diversified, the remediation effect is good, and the cost is low.
Description
Technical Field
The invention relates to the technical field of polluted soil remediation, in particular to a soil remediation agent using rice straw biomass charcoal as a raw material and a production method thereof.
Background
Contaminated soil remediation is generally accomplished by transferring, adsorbing, converting and degrading the contaminants in the soil to a level that is acceptable, or by converting toxic and harmful substances to non-toxic and harmless substances. At present, the main repairing methods include three major types, namely physical repairing methods, chemical repairing methods and biological repairing methods. Among them, the chemical repair method is a relatively convenient and inexpensive technique, and is also widely applicable.
The chemical repair technology has two main repair directions: firstly, the soil is leached, namely a chemical leaching agent is adopted to transfer solid-phase heavy metal Pb in the soil into liquid phase, the soil washed by clear water is returned to the original position, and finally, the waste liquid containing Pb is recycled and reprocessed, so that the effect of thoroughly removing pollution is achieved; and secondly, solidification and stabilization treatment, namely adding a soil remediation fixing agent into the soil to convert the form of Pb ions in the soil by adsorption, precipitation, chelation, redox, ion exchange and other modes, so that the bioavailability and mobility of Pb are reduced. The key to the successful application of the chemical remediation technology to the remediation of the heavy metal Pb in the soil is to select an efficient eluent and a curing agent.
At present, when a composite leaching technology is researched in China, the aim of improving the leaching efficiency is mainly achieved, and most of the leaching is carried out by adopting acid matching. The research on the efficiency of removing the heavy metal Pb in the soil by the composite leaching technology is high, but the method can destroy the original physicochemical property of the soil, bring other pollutants and is relatively difficult to operate practically, compared with the prior art, the solidification and stabilization treatment method has the advantages, and the technology has strong operability, is economic and environment-friendly and has good development prospect in large-scale application.
Chemical fixatives can generally be classified into three types, inorganic, organic and novel composite materials. The inorganic fixing agent mainly comprises clay substances, industrial byproducts, phosphates, metal oxides, commonly used zeolite, bentonite, lime, phosphate, ferric oxide and the like, and the organic passivating agent mainly comprises straws, animal wastes, biomass charcoal, municipal biological sludge and the like; the novel composite material mainly comprises various modified functional raw materials, inorganic and organic matter composite matching materials, nano materials and the like.
The research on the influence of the rice straw biomass charcoal on the soil is known in the prior art, the pH value of the rice straw biomass charcoal is high after the soil is treated by the rice straw biomass charcoal, the pH value of the soil can be remarkably improved by adding the rice straw charcoal, the bioavailability of Pb and Cd can be reduced after the rice straw charcoal is added, the transformation of Pb and Cd to a more stable state is promoted, in Pb and Cd compound polluted soil, for Pb, the weak acid extraction state of Pb can be promoted by adding the biomass charcoal, and the transformation of a reducible state and an oxidizable state to a residue state can be promoted; for Cd, the addition of the biochar can promote the conversion of the weak acid extraction state and the reducible state of the Cd to the oxidizable state, the addition of the biochar has no obvious influence on the residue state Cd, and the addition of the biochar can weaken the influence of the interaction of Pb and Cd on the weak acid extraction state Pb in Pb and Cd compound contaminated soil.
Moreover, the nature of the soil is complex, the influence factors are many, the buffering capacity is large, and the heavy metal Pb exists in various forms in the soil and has complex interactions such as competition, coexistence and the like, so that the remediation pollution of various chemical fixing agents is single, the remediation effect is low, and therefore, the improvement of the curing remediation agent in the complex soil environment needs to be solved urgently.
Based on the above, the invention designs a soil remediation agent using rice straw biomass charcoal as a raw material and a production method thereof, so as to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a soil remediation agent using rice straw biomass charcoal as a raw material and a production method thereof, and aims to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a soil remediation agent using rice straw biomass charcoal as a raw material comprises the following raw materials in percentage by mass:
45% -55% of rice straw biomass charcoal;
20% -30% of polyhydroxy ferric phosphate;
20-30% of amino hydroxyl ferric oxide loaded with chitosan;
wherein the sum of the mass percentages of the raw materials is 100%.
Preferably, the first and second liquid crystal materials are,
50% of rice straw biomass charcoal;
25% of polyhydroxy ferric phosphate;
25% of chitosan-loaded amino iron oxyhydroxide.
A production method of a soil remediation agent taking rice straw biomass charcoal as a raw material specifically comprises the following steps: uniformly mixing the rice straw biomass charcoal, the polyhydroxy ferric phosphate and the amino hydroxyl ferric oxide loaded with chitosan, and mixing by a stirring system to obtain the soil remediation agent.
Preferably, the preparation method of the rice straw biomass charcoal comprises the following steps,
s1: naturally air-drying and drying the rice straws, and then cutting the rice straws by a cutting machine, wherein the length of the treated rice straw raw material is less than 2.5cm, and the water content is controlled to be less than 18%;
s2: pyrolyzing the biomass material by a biomass carbonization system at 400-600 ℃ under the anoxic condition to obtain the rice straw biomass carbon, and vibrating, grinding and crushing the rice straw biomass carbon into powder with the particle size of less than 100 mu m.
Preferably, the preparation method of the polyhydroxy ferric phosphate comprises the following steps,
s1: the main component is FeSO4The titanium dioxide byproduct is dissolved in water and then is added into FeSO according to a certain molar ratio4Slowly dripping hydrogen peroxide into the solution, reacting for 20min, then adding monocalcium phosphate, and stirring until the monocalcium phosphate is completely dissolved to obtain a mixed solution;
s2: then, adding the supernatant of the carbide slag into the mixed solution while stirring the obtained mixed solution, adjusting the pH of the mixed solution to 7.2, quickly pouring the mixed solution into cold ammonia water containing lauryl methyl sodium sulfate which is stirred vigorously at 60 ℃, placing the mixed solution on a magnetic stirrer, continuously heating and stirring for 2 hours, curing for 0.5 hour, carrying out centrifugal separation, pouring out the supernatant, and washing with distilled water and propanol for multiple times to obtain a solid;
s3: drying the obtained solid in an oven until the water content is controlled to be less than 10%, and grinding the solid into powder with the particle size of less than 100 mu m by a ball mill.
Preferably, the preparation method of the chitosan-loaded amino iron oxyhydroxide comprises the following steps,
s1, weighing a certain amount of FeCl3·6H2O, and the mixture and ethylene glycol are put into a 500mL beaker, the mixture is magnetically stirred for about 30min until the mixture is completely dissolved, then anhydrous sodium acetate, diethylenetriamine and sodium dodecyl sulfate are sequentially added, the mixture is stirred and ultrasonically dissolved for 30min, then the mixture is transferred into a 500mL self-pressure reaction kettle containing a polytetrafluoroethylene lining, under the condition of 160 ℃, the mixture is crystallized for 8h, the mixture is naturally cooled to the room temperature, the obtained precipitate is transferred into a centrifuge tube, the centrifugation is carried out for 5min at 4000r/min, the mixture is alternately washed by deionized water and anhydrous ethanol for three times, and the drying is carried out at 60 ℃ to obtain NH2-FeOOH；
S2, measuring glacial acetic acid by a pipette, fixing the volume in a 500mL volumetric flask, shaking uniformly to prepare 2% glacial acetic acid, weighing a certain amount of chitosan in a beaker, adding a proper amount of prepared glacial acetic acid solution, dissolving, transferring to a 100mL volumetric flask for fixing the volume, weighing equivalent NH2Pouring the solution in the volumetric flask out of a beaker with FeOOH, adding a cationic surfactant cetyl trimethyl ammonium bromide, shaking the solution at 60 ℃ for 2 hours, centrifuging, drying in an oven until the water content is controlled to be less than 10%, and grinding into powder with the particle size of less than 100 mu m by a ball mill.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, rice straw biomass charcoal is used as a raw material, polyhydroxy ferric phosphate and chitosan-loaded amino hydroxyl ferric oxide are used as auxiliary materials, so that the bioavailability of Cd and Pb is reduced, the conversion of Cd and Pb to a more stable state is promoted, the soil remediation method can be adapted to the properties of soil, and has the advantages of various remediation pollutions, good remediation effect, low cost, high efficiency, environmental friendliness, convenience in use, easiness in processing and the like, and has a wide application prospect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a table showing Cd/Pb removal rate of a soil remediation agent added with 2% by mass of soil according to the present invention;
FIG. 2 is a table showing the Cd/Pb removal rate of the soil remediation agent added with 4% of the soil mass according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
A soil remediation agent using rice straw biomass charcoal as a raw material comprises the following raw materials in percentage by mass:
45% of rice straw biomass charcoal;
25% of polyhydroxy ferric phosphate;
30% of chitosan-loaded amino iron oxyhydroxide;
wherein the sum of the mass percentages of the raw materials is 100%.
A production method of a soil remediation agent taking rice straw biomass charcoal as a raw material specifically comprises the following steps:
the preparation of the biomass charcoal of the rice straws,
s1: naturally air-drying and drying the rice straws, and then cutting the rice straws by a cutting machine, wherein the length of the treated rice straw raw material is 2.5cm, and the water content is controlled to be 18%;
s2: the biomass material is pyrolyzed by a biomass carbonization system under the anoxic condition of 500 ℃ to obtain the rice straw biomass charcoal, and the rice straw biomass charcoal is pulverized into powder with the particle size of 95 mu m by vibration grinding.
S1: the preparation of the polyhydroxy ferric phosphate comprises the following step of preparing a main component of FeSO4The titanium dioxide byproduct is dissolved in water to prepare FeSO with the concentration of 0.3mol/L4Solution to FeSO according to a certain mole ratio4Slowly dripping hydrogen peroxide into the solution, reacting for 20min, then adding monocalcium phosphate, and stirring until the monocalcium phosphate is completely dissolved to obtain a mixed solution;
s2: then, adding the supernatant of the carbide slag into the mixed solution while stirring the obtained mixed solution, adjusting the pH of the mixed solution to 7.2, quickly pouring the mixed solution into cold ammonia water containing lauryl methyl sodium sulfate which is stirred vigorously at 60 ℃, placing the mixed solution on a magnetic stirrer, continuously heating and stirring for 2 hours, curing for 0.5 hour, carrying out centrifugal separation, pouring out the supernatant, and washing with distilled water and propanol for multiple times to obtain a solid;
s3: the obtained solid is dried by an oven, the water content is controlled to be 10%, and the solid is crushed into powder with the grain diameter of 92 mu m by a ball mill.
Preparing amino hydroxyl ferric oxide of load chitosan,
s1, weighing 10.8g of FeCl3·6H2O, measuring 320mL of ethylene glycol, putting the ethylene glycol into a 500mL beaker, magnetically stirring for about 30min until the ethylene glycol is completely dissolved, then sequentially adding 16.0g of anhydrous sodium acetate, 40mL of diethylenetriamine and 1.6g of lauryl sodium sulfate, stirring, ultrasonically dissolving for 30min, transferring into a 500mL self-pressure reaction kettle with a polytetrafluoroethylene lining, crystallizing for 8h at 160 ℃, naturally cooling to room temperature, transferring the obtained precipitate into a centrifuge tube, centrifuging for 5min at 4000r/min, alternately washing with deionized water and anhydrous ethanol for three times, and drying at 60 ℃ to obtain NH2-FeOOH；
S2, measuring 10mL of glacial acetic acid by a pipette, adding the glacial acetic acid into a 500mL volumetric flask to a constant volume, shaking uniformly to prepare 2% of glacial acetic acid, weighing 1.0g of chitosan into a beaker, adding a proper amount of prepared glacial acetic acid solution, dissolving, transferring the glacial acetic acid solution into a 100mL volumetric flask to a constant volume, weighing 1.0g of NH2-FeOOH into the beaker, pouring out the solution in the volumetric flask, adding 0.5g of cationic surfactant cetyl trimethyl ammonium bromide, shaking uniformly at 60 ℃ for 2h, centrifuging, drying in an oven until the water content is controlled at 10%, and crushing the solution into powder with the particle size of 92 microns by a ball mill.
Uniformly mixing the prepared rice straw biomass carbon, polyhydroxy ferric phosphate and chitosan-loaded amino hydroxyl ferric oxide according to mass percent, and mixing through a stirring system to obtain the soil remediation agent.
Example two
A soil remediation agent using rice straw biomass charcoal as a raw material comprises the following raw materials in percentage by mass:
50% of rice straw biomass charcoal;
25% of polyhydroxy ferric phosphate;
25% of chitosan-loaded amino iron oxyhydroxide;
wherein the sum of the mass percentages of the raw materials is 100%.
A production method of a soil remediation agent taking rice straw biomass charcoal as a raw material specifically comprises the following steps:
the preparation of the biomass charcoal of the rice straws,
s1: naturally air-drying and drying the rice straws, and then cutting the rice straws by a cutting machine, wherein the length of the treated rice straw raw material is 2.2cm, and the water content is controlled at 16%;
s2: the biomass material is pyrolyzed by a biomass carbonization system under the anoxic condition of 500 ℃ to obtain the rice straw biomass charcoal, and the rice straw biomass charcoal is pulverized into powder with the particle size of 92 mu m by vibration grinding.
The preparation of the polyhydroxy ferric phosphate is carried out,
s1: the main component is FeSO4The titanium dioxide byproduct is dissolved in water to prepare FeSO with the concentration of 0.3mol/L4Solution to FeSO according to a certain mole ratio4Slowly dripping hydrogen peroxide into the solution, reacting for 20min, then adding monocalcium phosphate, and stirring until the monocalcium phosphate is completely dissolved to obtain a mixed solution;
s2: then, adding the supernatant of the carbide slag into the mixed solution while stirring the obtained mixed solution, adjusting the pH of the mixed solution to 7.2, quickly pouring the mixed solution into cold ammonia water containing lauryl methyl sodium sulfate which is stirred vigorously at 60 ℃, placing the mixed solution on a magnetic stirrer, continuously heating and stirring for 2 hours, curing for 0.5 hour, carrying out centrifugal separation, pouring out the supernatant, and washing with distilled water and propanol for multiple times to obtain a solid;
s3: the obtained solid is dried by an oven, the water content is controlled to be 8%, and the solid is crushed into powder with the particle size of 90 mu m by a ball mill.
Preparing amino hydroxyl ferric oxide of load chitosan,
s1, weighing 10.8g of FeCl3·6H2O, measuring 320mL of ethylene glycol, putting the ethylene glycol into a 500mL beaker, magnetically stirring for about 30min until the ethylene glycol is completely dissolved, then sequentially adding 16.0g of anhydrous sodium acetate, 40mL of diethylenetriamine and 1.6g of lauryl sodium sulfate, stirring, ultrasonically dissolving for 30min, transferring into a 500mL self-pressure reaction kettle with a polytetrafluoroethylene lining, crystallizing for 8h at 160 ℃, naturally cooling to room temperature, transferring the obtained precipitate into a centrifuge tube, centrifuging for 5min at 4000r/min, alternately washing with deionized water and anhydrous ethanol for three times, and drying at 60 ℃ to obtain NH2-FeOOH；
S2, measuring 10mL of glacial acetic acid by a pipette, adding the glacial acetic acid into a 500mL volumetric flask to a constant volume, shaking uniformly to prepare 2% of glacial acetic acid, weighing 1.0g of chitosan into a beaker, adding a proper amount of prepared glacial acetic acid solution, dissolving, transferring the glacial acetic acid solution into a 100mL volumetric flask to a constant volume, weighing 1.0g of NH2-FeOOH into the beaker, pouring out the solution in the volumetric flask, adding 0.5g of cationic surfactant cetyl trimethyl ammonium bromide, shaking uniformly at 60 ℃ for 2h, centrifuging, drying in an oven until the water content is controlled at 9%, and crushing the solution into powder with the particle size of 86 μm by a ball mill.
Uniformly mixing the prepared rice straw biomass carbon, polyhydroxy ferric phosphate and chitosan-loaded amino hydroxyl ferric oxide according to mass percent, and mixing through a stirring system to obtain the soil remediation agent.
EXAMPLE III
A soil remediation agent using rice straw biomass charcoal as a raw material comprises the following raw materials in percentage by mass:
55% of rice straw biomass charcoal;
25% of polyhydroxy ferric phosphate;
20% of chitosan-loaded amino iron oxyhydroxide;
wherein the sum of the mass percentages of the raw materials is 100%.
A production method of a soil remediation agent taking rice straw biomass charcoal as a raw material specifically comprises the following steps:
the preparation of the biomass charcoal of the rice straws,
s1: naturally air-drying and drying the rice straws, and then cutting the rice straws by a cutting machine, wherein the length of the treated rice straw raw material is 2.0cm, and the water content is controlled to be 12%;
s2: the biomass material is pyrolyzed by a biomass carbonization system under the anoxic condition of 500 ℃ to obtain the rice straw biomass charcoal, and the rice straw biomass charcoal is pulverized into powder with the particle size of 88 mu m by vibration grinding.
The preparation of the polyhydroxy ferric phosphate is carried out,
s1: the main component is FeSO4The titanium dioxide byproduct is dissolved in water to prepare FeSO with the concentration of 0.3mol/L4Solution to FeSO according to a certain mole ratio4Slowly dripping hydrogen peroxide into the solution, reacting for 20min, then adding monocalcium phosphate, and stirring until the monocalcium phosphate is completely dissolved to obtain a mixed solution;
s2: then, adding the supernatant of the carbide slag into the mixed solution while stirring the obtained mixed solution, adjusting the pH of the mixed solution to 7.2, quickly pouring the mixed solution into cold ammonia water containing lauryl methyl sodium sulfate which is stirred vigorously at 60 ℃, placing the mixed solution on a magnetic stirrer, continuously heating and stirring for 2 hours, curing for 0.5 hour, carrying out centrifugal separation, pouring out the supernatant, and washing with distilled water and propanol for multiple times to obtain a solid;
s3: the obtained solid is dried by an oven, the water content is controlled to be 6%, and the solid is crushed into powder with the particle size of 86 mu m by a ball mill.
Preparing amino hydroxyl ferric oxide of load chitosan,
s1, weighing 10.8g of FeCl3·6H2O, measuring 320mL of ethylene glycol, putting the ethylene glycol into a 500mL beaker, magnetically stirring for about 30min until the ethylene glycol is completely dissolved, then sequentially adding 16.0g of anhydrous sodium acetate, 40mL of diethylenetriamine and 1.6g of lauryl sodium sulfate, stirring, ultrasonically dissolving for 30min, transferring into a 500mL self-pressure reaction kettle with a polytetrafluoroethylene lining, crystallizing for 8h at 160 ℃, naturally cooling to room temperature, transferring the obtained precipitate into a centrifuge tube, centrifuging for 5min at 4000r/min, alternately washing with deionized water and anhydrous ethanol for three times, and drying at 60 ℃ to obtain NH2-FeOOH；
S2, measuring 10mL of glacial acetic acid by a pipette, adding the glacial acetic acid into a 500mL volumetric flask to a constant volume, shaking uniformly to prepare 2% of glacial acetic acid, weighing 1.0g of chitosan into a beaker, adding a proper amount of prepared glacial acetic acid solution, dissolving, transferring the glacial acetic acid solution into a 100mL volumetric flask to a constant volume, weighing 1.0g of NH2-FeOOH into the beaker, pouring out the solution in the volumetric flask, adding 0.5g of cationic surfactant cetyl trimethyl ammonium bromide, shaking uniformly at 60 ℃ for 2h, centrifuging, drying in an oven until the water content is controlled at 7%, and crushing the solution into powder with the particle size of 84 μm by a ball mill.
Uniformly mixing the prepared rice straw biomass carbon, polyhydroxy ferric phosphate and chitosan-loaded amino hydroxyl ferric oxide according to mass percent, and mixing through a stirring system to obtain the soil remediation agent.
The soil to be tested was acid soil, and surface soil near a lead-zinc smelting plant in Chenzhou province, Chenxing county, Hunan province was used. The collected soil is naturally air-dried in a dry and ventilated place, non-soil impurities such as animal carcasses, dry excrement, plant branches and stones and the like are removed, the soil is ground, and the ground soil is screened by a nylon sieve with the aperture of 2mm and then fully and uniformly mixed.
Weighing air-dried soil after passing through a nylon sieve, and respectively adding 3CdSO with the concentration of 10.0mg/kg4·8H2O solution and Pb (NO) added at 2500mg/kg3）2The solution (2%) and (4%) of the soil mass are addedThe soil remediation agent of the same example, with no remediation agent added, was used as Control (CK). According to the following steps: adding deionized water according to the water-soil ratio of 1 and stirring uniformly. Respectively standing for 40 days, drying the soil sample, respectively leaching the heavy metals in an effective state and a water-soluble state with a DTPA solution and deionized water, oscillating and filtering, and measuring the concentrations of Cd and Pb in the filtrate by using a flame atomic absorption spectrophotometer.
FIG. 1 shows the Cd/Pb removal rate of a soil remediation agent added with 2% of the soil mass.
FIG. 2 shows the Cd/Pb removal rate of a soil remediation agent added with 4% of the soil mass.
It can be seen that the removal rate of Cd/Pb by using the soil remediation agent is greatly improved compared with that of a control example without adding the remediation agent, and the removal rate of Cd/Pb is also improved to a gentle state along with the increase of the addition concentration.
According to the invention, rice straw biomass charcoal is used as a raw material, polyhydroxy ferric phosphate and chitosan-loaded amino hydroxyl ferric oxide are used as auxiliary materials, so that the bioavailability of Cd and Pb is reduced, the conversion of Cd and Pb to a more stable state is promoted, the soil remediation method can be adapted to the properties of soil, and has the advantages of various remediation pollutions, good remediation effect, low cost, high efficiency, environmental friendliness, convenience in use, easiness in processing and the like, and has a wide application prospect. The polyhydroxy ferric phosphate and the chitosan-loaded amino hydroxyl ferric oxide are chemical fixing agents, and are combined with three types of inorganic materials, organic materials and novel composite materials, so that the characteristics of the soil remediation agent are improved, and the removal effect of heavy metals in the polluted soil is greatly improved.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (6)
1. A soil remediation agent using rice straw biomass charcoal as a raw material is characterized in that: the soil remediation agent is prepared from the following raw materials in percentage by mass:
45% -55% of rice straw biomass charcoal;
20% -30% of polyhydroxy ferric phosphate;
20-30% of amino hydroxyl ferric oxide loaded with chitosan;
wherein the sum of the mass percentages of the raw materials is 100%.
2. The soil remediation agent using rice straw biomass charcoal as a raw material as claimed in claim 1, wherein:
50% of rice straw biomass charcoal;
25% of polyhydroxy ferric phosphate;
25% of chitosan-loaded amino iron oxyhydroxide.
3. A production method of a soil remediation agent taking rice straw biomass charcoal as a raw material is characterized by comprising the following steps: the method specifically comprises the following steps: uniformly mixing the rice straw biomass charcoal, the polyhydroxy ferric phosphate and the amino hydroxyl ferric oxide loaded with chitosan, and mixing by a stirring system to obtain the soil remediation agent.
4. The production method of the soil remediation agent with rice straw biomass charcoal as the raw material as claimed in claim 3, wherein: the preparation method of the rice straw biomass charcoal comprises the following steps,
s1: naturally air-drying and drying the rice straws, and then cutting the rice straws by a cutting machine, wherein the length of the treated rice straw raw material is less than 2.5cm, and the water content is controlled to be less than 18%;
s2: pyrolyzing the biomass material by a biomass carbonization system at 400-600 ℃ under the anoxic condition to obtain the rice straw biomass carbon, and vibrating, grinding and crushing the rice straw biomass carbon into powder with the particle size of less than 100 mu m.
5. The production method of the soil remediation agent with rice straw biomass charcoal as the raw material as claimed in claim 3, wherein: the preparation method of the polyhydroxy ferric phosphate comprises the following steps,
s1: the main component is FeSO4The titanium dioxide byproduct is dissolved in water and then is added into FeSO according to a certain molar ratio4Slowly dripping hydrogen peroxide into the solution, reacting for 20min, then adding monocalcium phosphate, and stirring until the monocalcium phosphate is completely dissolved to obtain a mixed solution;
s2: then, adding the supernatant of the carbide slag into the mixed solution while stirring the obtained mixed solution, adjusting the pH of the mixed solution to 7.2, quickly pouring the mixed solution into cold ammonia water containing lauryl methyl sodium sulfate which is stirred vigorously at 60 ℃, placing the mixed solution on a magnetic stirrer, continuously heating and stirring for 2 hours, curing for 0.5 hour, carrying out centrifugal separation, pouring out the supernatant, and washing with distilled water and propanol for multiple times to obtain a solid;
s3: drying the obtained solid in an oven until the water content is controlled to be less than 10%, and grinding the solid into powder with the particle size of less than 100 mu m by a ball mill.
6. The production method of the soil remediation agent with rice straw biomass charcoal as the raw material as claimed in claim 3, wherein: the preparation method of the chitosan-loaded amino iron oxide hydroxide comprises the following steps,
s1, weighing a certain amount of FeCl3·6H2O, and the mixture and ethylene glycol are put into a 500mL beaker, are magnetically stirred for about 30min until the mixture is completely dissolved, and are added with anhydrous sodium acetate, diethylenetriamine and sodium dodecyl sulfate in turn, stirred and ultrasonically dissolved for 30min, and then are transferred into 500mL of beaker containing polytetrafluoroethyleneCrystallizing for 8h in an alkene-lined autogenous pressure reaction kettle at 160 ℃, naturally cooling to room temperature, transferring the obtained precipitate into a centrifuge tube, centrifuging for 5min at 4000r/min, alternately washing with deionized water and absolute ethyl alcohol for three times, and drying at 60 ℃ to obtain NH2-FeOOH；
S2, measuring glacial acetic acid by a pipette, fixing the volume in a 500mL volumetric flask, shaking uniformly to prepare 2% glacial acetic acid, weighing a certain amount of chitosan in a beaker, adding a proper amount of prepared glacial acetic acid solution, dissolving, transferring to a 100mL volumetric flask for fixing the volume, weighing equivalent NH2Pouring the solution in the volumetric flask out of a beaker with FeOOH, adding a cationic surfactant cetyl trimethyl ammonium bromide, shaking the solution at 60 ℃ for 2 hours, centrifuging, drying in an oven until the water content is controlled to be less than 10%, and grinding into powder with the particle size of less than 100 mu m by a ball mill.
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| CN112028196A (en) * | 2020-08-12 | 2020-12-04 | 江苏里下河地区农业科学研究所 | Method for green and efficient utilization of aquaculture tail water in crop field |
Citations (2)
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| CN112028196A (en) * | 2020-08-12 | 2020-12-04 | 江苏里下河地区农业科学研究所 | Method for green and efficient utilization of aquaculture tail water in crop field |
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