CN110756166A - Corncob-loaded magnesium-modified adsorption material and preparation method and application thereof - Google Patents

Corncob-loaded magnesium-modified adsorption material and preparation method and application thereof Download PDF

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Publication number
CN110756166A
CN110756166A CN201911218403.2A CN201911218403A CN110756166A CN 110756166 A CN110756166 A CN 110756166A CN 201911218403 A CN201911218403 A CN 201911218403A CN 110756166 A CN110756166 A CN 110756166A
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adsorption
magnesium
adsorbing
corncob
biochar
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邓玉
李敏
刘巧
范莉
刘斌
张展
蒋可乐
晏琪涵
王加浩
宋恩泽
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Sichuan Agricultural University
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Sichuan Agricultural University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/04Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
    • B01J20/041Oxides or hydroxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20Solid 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
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/28Treatment of water, waste water, or sewage by sorption
    • C02F1/281Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/28Treatment of water, waste water, or sewage by sorption
    • C02F1/283Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00Aspects relating to sorbent materials
    • B01J2220/40Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/48Sorbents characterised by the starting material used for their preparation
    • B01J2220/4812Sorbents characterised by the starting material used for their preparation the starting material being of organic character
    • B01J2220/4825Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/105Phosphorus compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/16Nitrogen compounds, e.g. ammonia

Abstract

The invention provides a preparation method of a corncob-loaded magnesium modified adsorbing material, and belongs to the technical field of adsorbing materials. The preparation method of the modified adsorption material comprises the following steps: (1) adding the crushed corncob powder into a magnesium salt solution, then ultrasonically dispersing the mixture at room temperature for 2-6 h, and drying in an oven; (2) the dried mixture was placed in a muffle furnace at N2Carrying out pyrolysis carbonization under protection, wherein the temperature of the pyrolysis carbonization is 300-500 ℃, the time of the pyrolysis carbonization is 1-2 h, and cooling the inside of the furnace to room temperature; (3) the product obtained is washed to the top with deionized waterAnd (4) putting the supernatant fluid to be neutral, and drying in an oven to obtain the corncob-loaded magnesium modified biochar adsorbing material. The modified adsorption material prepared by the invention has higher adsorption performance, has better adsorption capacity to N and P, can be used for removing phosphorus and nitrogen in eutrophic water, and has simple preparation method and low cost.

Description

Corncob-loaded magnesium-modified adsorption material and preparation method and application thereof
Technical Field
The invention belongs to the technical field of preparation of biological adsorption materials from agricultural wastes, and particularly relates to a corncob-loaded magnesium modified adsorption material and a preparation method and application thereof.
Background
The eutrophication of water is one of the main water pollution problems in China. Excessive N, P content in water can cause excessive propagation of algae and other microorganisms, rapid reduction of dissolved oxygen in water, reduction of water quality and serious damage to the ecological environment of water, and N and P are considered as control factors for eutrophication of most lakes and fresh water systems. At present, there are many methods for removing P in water, including chemical precipitation, ion exchange, biological and adsorption methods. Among these methods, the adsorption method is considered as a treatment technique which is simple in operation, efficient, fast, and low in cost. Various adsorbents have been developed, such as zirconium magnesium modified zeolite proposed in patent CN 106362681 a, whose preparation requires zirconium, which is a relatively expensive element, and whose adsorption capacity for P is also relatively low; the patent CN 108554372 a proposes a phosphorus adsorbent of aluminum salt modified kaolin, which is inexpensive to prepare, but the adsorption capacity of the adsorption material for P is low. The adsorption capacity of the adsorbent material for P still needs to be further improved,most of the existing adsorbing materials are used for adsorbing single substances, but actually, the components in water body pollution are complex, and organic matters, ammonia nitrogen, nitrate nitrogen and Na+、Mg+The adsorption effect is interfered by the existence of substances, and a few materials capable of efficiently adsorbing N and P in the water body are reported, so that the development of the economic and effective adsorbent in a complex water body environment has a wide application prospect.
As a big agricultural country, China can generate a large amount of agricultural wastes such as straws every year. These agricultural wastes are often discarded to be naturally decomposed or incinerated on site, resulting in waste of biomass resources and serious environmental pollution. The preparation of the agricultural wastes into the biochar is an effective way for realizing the resource utilization of the agricultural wastes. The corn cob is used as a byproduct of corn, and the annual yield reaches 4 multiplied by 107t, but over 80 percent of corncobs are randomly placed or burned, which not only causes waste of biomass resources, but also causes adverse effects on the environment. The corncob biological adsorption method is an economic, effective and popularization and application value heavy metal wastewater treatment method due to low material cost, wide sources, reproducibility and good adsorption performance. In recent years, many experts and scholars at home and abroad make intensive research around corncob adsorbing materials and obtain certain results. For example, patent CN 107413301A discloses a modified corncob adsorbent material and a preparation method thereof, which is used for adsorbing cationic dyes such as malachite green, and the adsorption rate of the modified corncob adsorbent material reaches more than 90%.
The biochar is used as an adsorbent, has large specific surface area, developed pore structure and abundant surface functional groups, and can be used for treating cationic inorganic pollutants (such as Cu)2+、Pb2+、Cd2+) Has stronger adsorption capacity. However, the biochar surface is usually negatively charged and due to electrostatic interactions it is directed towards anionic inorganic contaminants (PO)4 3-、NO3 -And NH4 +) The adsorption capacity of the adsorbent is limited, and the adsorbent capable of efficiently adsorbing N and P in water is difficult to prepare. Therefore, how to prepare a novel cheap environment-friendly target with excellent adsorption performanceThe adsorbents of P and N are technical problems that the person skilled in the art is demanding to solve.
Disclosure of Invention
The invention aims to solve the technical problems, and provides a corncob-loaded magnesium-modified adsorption material, a preparation method and application thereof, so as to provide a method capable of effectively removing N and P in eutrophic water. The adsorbing material provided by the invention can be used for adsorbing PO in eutrophic water body4 3-And NH4 +Meanwhile, the adsorbing material disclosed by the invention can adapt to a wider pH (3-9) range, is simple in preparation process, cheap and easily available in raw materials and low in preparation cost, and can well meet the requirements of industrial production and use.
The invention aims to provide a preparation method of a corncob-loaded magnesium-modified adsorbing material, which is characterized by comprising the following steps of:
(1) drying and crushing corncobs, sieving the corncobs by a 1mm sieve to obtain corncob powder, adding the corncob powder into a magnesium salt solution, wherein the mass ratio of magnesium to the corncobs is 20%, then ultrasonically dispersing the mixture at room temperature for 2-6 h, wherein the power of ultrasonic is 150W, and drying the mixture in an oven;
(2) the dried mixture was placed in a muffle furnace at N2Carrying out pyrolysis carbonization under protection, wherein the temperature of the pyrolysis carbonization is 300-350 ℃, the time of the pyrolysis carbonization is 1-2 h, and cooling the inside of the furnace to room temperature;
(3) washing the obtained product with deionized water until supernatant is neutral, and drying in an oven to obtain the corncob-loaded magnesium modified biochar adsorbing material.
Further, in the step (1), the magnesium salt is at least one of magnesium chloride, magnesium nitrate and magnesium sulfate.
Further, the corncob is dried to the moisture content of less than 3% in the step (1).
Further, the temperature of the mixture dried in the oven in the step (1) is 60-80 ℃.
Further, the temperature for drying in the oven in the step (3) is 60-80 ℃.
Further, in the step (1), the corncobs are cleaned, rinsed for 3 times by deionized water, placed in an oven for drying to remove impurities, and then crushed by a 1mm sieve.
The invention also aims to provide the corncob-loaded magnesium modified biochar adsorbing material prepared by the method.
The invention also aims to provide application of the corncob-loaded magnesium-modified biochar adsorbing material, wherein the adding proportion of the biochar adsorbing material in eutrophic water is 2.4g/L, and the biochar adsorbing material is prepared into a solution with the initial pH value of 3-9. The biochar adsorbing material is used for treating PO in eutrophic water body4 3-And NH4 +Has better adsorption capacity.
Compared with the prior art, the invention has the advantages that:
(1) the corn cob-loaded magnesium-modified biochar adsorbing material has a good pore structure, has high P and N adsorbing capacity, and can adapt to a wide pH range (3-9);
(2) the preparation method has the advantages of simple preparation process, cheap and easily-obtained raw materials and low preparation cost, and can meet the requirements of industrial production and use;
(3) the invention utilizes the agricultural waste corncobs as the raw material to prepare the Mg-loaded modified biochar as the adsorbent, provides an effective way for recycling a large amount of agricultural waste, and has obvious economic benefit and environmental benefit.
Drawings
FIG. 1: scanning electron micrographs (SEM × 3000) of virgin Biochar (BC) and Mg-modified biochar (Mg-BC);
FIG. 2: the influence of Mg-BC with different modification ratios on P adsorption;
FIG. 3: isothermal adsorption line of 20% Mg-BC for P;
FIG. 4: influence of the addition amount on P adsorption of Mg-BC;
FIG. 5: influence of the initial pH value of the solution on P adsorption of Mg-BC;
FIG. 6: different N, P ratios of adsorption performance of Mg-BC in mixed solution to N, P.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the following embodiments, and it should be noted that the following embodiments are only for explaining and illustrating the present invention and are not intended to limit the present invention. The invention is not limited to the embodiments described above, but rather, may be modified within the scope of the invention.
Example 1
The preparation method of the modified biochar adsorbing material comprises the following steps:
washing corncob with tap water, washing with deionized water for 3 times, oven drying at 80 deg.C until water content is below 3%, and pulverizing with 1mm sieve. Weighing a certain mass of corncobs, and mixing the components in percentage by mass as Mg: the mass ratio of the corncobs is respectively as follows: preparing MgCl with corresponding concentration by 5%, 10%, 15% and 20%2Solution (from MgCl)2·6H2O preparation) with prepared MgCl2The solution impregnates the corncobs, the suspension is stirred at room temperature for 2h, and the mixture is then oven-dried at 80 ℃. Placing the pretreated corn cob in N2Under protection, the temperature is raised to 450 ℃ at the heating rate of 10 ℃/min, and the temperature is kept for 1h and then the temperature is cooled to room temperature. Washing the prepared biochar with deionized water until the supernatant is neutral, and drying in an oven at 80 ℃ to obtain Mg modified biochar (Mg-BC). Comparative example 1
The preparation method of the original biochar adsorbing material comprises the following steps:
cleaning corncob with tap water, washing with deionized water for 3 times, oven drying at 80 deg.C until water content is below 3%, pulverizing, sieving with 1mm sieve, and sieving with N sieve2Under protection, heating to 450 ℃ at a heating rate of 10 ℃/min, keeping the temperature for 1h, cooling to room temperature, washing the prepared biochar with deionized water for several times until supernatant is neutral, and drying in an oven at 80 ℃ to obtain the original Biochar (BC).
Test example 1
The morphology change of the original biochar and the Mg modified biochar was observed using a field emission Scanning Electron Microscope (SEM) (Hitachi S-4800). Fig. 1 is an image of raw Biochar (BC) and Mg-modified biochar (Mg-BC) observed by scanning electron microscopy at 3000-fold magnification. As can be seen in FIG. 1, the BC surface is relatively smooth with some undeveloped porosity; Mg-BC has a rough surface and a developed porous structure was found, while a large amount of magnesium oxide and hydroxide nano-platelets was densely dispersed on the Mg-BC surface.
Test example 2
Determining the adsorption capacity of Mg modified biochar with different modification ratios to phosphorus through an adsorption experiment, wherein the specific method comprises the following steps:
weighing 0.1g of the biochar prepared above into 100mL centrifuge tubes, respectively, and adding 50mL PO with concentration of 50mg/L4 3--P、NO3 --N、NH4 +N, pH 6, the mixture was shaken at 180rpm at 25 ℃ for 24 h. Filtering the sample with 0.45 μm filter membrane, and measuring PO in the filtrate by ammonium molybdate spectrophotometry, ion chromatograph method and Nashin's reagent spectrophotometry4 3--P、NO3 --N、NH4 +-the concentration of N. The optimum modification ratio was determined by comparing the respective modification ratios with the adsorption amounts of P and N in the solution.
The adsorption capacity of Mg-BC to P in different modification ratios is shown in FIG. 2. It can be seen that the original biochar has a poor P adsorption capacity of only 0.68 mg/g. The Mg modified biochar can obviously improve the adsorption capacity to P and is increased along with the increase of the Mg content. When the modification ratio is 20%, the adsorption amount of P is 19.64mg/g, which is 28.89 times that of unmodified biochar.
Test example 3
The maximum adsorption capacity of the modified biochar adsorption material for P and the optimal adsorption condition of the modified biochar adsorption material for P in the adsorbed water are further determined as follows:
(1) determining the maximum adsorption capacity of the Mg modified biochar with the optimal modification ratio:
to PO4 3-The initial concentrations of the P-adsorbing solutions were set to 1, 3, 5, 10, 30, 50, 70, 100,150. 200, 250, 300, 400, 600, 800mg/L, adjusting the pH to 6. 0.1g of Mg-modified biochar (i.e., 20% Mg-BC) in the optimum modification ratio was weighed into a 100mL centrifuge tube, and 50mL of the above-prepared solutions were added, respectively. The mixture was shaken at 180rpm at 25 ℃ for 24 h. Filtering with 0.45 μm filter membrane, and measuring PO in the filtrate by ammonium molybdate spectrophotometry4 3--P concentration. And determining the maximum adsorption capacity by drawing an isothermal adsorption curve of the Mg modified biochar with the optimal modification ratio to P.
The adsorption isotherm of the Mg-modified biochar at the optimum modification ratio is shown in fig. 3. As is clear from FIG. 3, the amount of Mg-BC adsorbed gradually increased with the increase in the concentration of P in the solution. When the equilibrium concentration is 0-100 Mg/L, the Mg-BC adsorption capacity is rapidly increased; when the equilibrium concentration is 100-800 mg/L, the increase of the adsorption amount is slow, and the adsorption amount finally approaches to an equilibrium state. Adsorption data were fitted using the Langmuir equation, R20.9493; meanwhile, the theoretical maximum adsorption capacity calculated by using a Langmuir equation is 56.12Mg/g, which is close to the experimental data of 56.97Mg/g, so that the Langmuir model can well describe the adsorption of the Mg modified biochar to P, and the adsorption process is similar to monolayer adsorption.
(2) Determining the optimal addition amount of Mg modified biochar:
weighing Mg modified biochar with optimal modification ratio of 0.04, 0.08, 0.12, 0.16, 0.2 and 0.3g respectively in a 100mL centrifuge tube and 50mL PO4 3--adsorption solution mixture of P concentration 50mg/L and pH 6. The mixture was shaken at 180rpm at 25 ℃ for 24 h. Filtering with 0.45 μm filter membrane, and measuring PO in the filtrate by ammonium molybdate spectrophotometry4 3--P concentration. And (4) drawing a change curve of the adsorption amount and the removal rate of the adsorption material to P along with the addition amount of Mg modified biochar, and determining the optimal addition amount.
The effect of the addition amount on P adsorption by Mg-BC is shown in FIG. 4. As can be seen from fig. 4, the amount of adsorption of P gradually decreased and the removal rate gradually increased with the increase in the amount of Mg-modified biochar added. When the addition amount is 0.04 to 0.12g, the removal rate is rapidly increased from 30% to 79.7%, probably because the effective adsorption sites are increased as the addition amount is increased. However, as the amount of addition is further increased, the removal rate slowly increases and eventually reaches equilibrium. The reduction in the amount of adsorption may be related to electrostatic induction and repulsion between the adsorbent binding sites; meanwhile, when the content of adsorbate in the solution is not changed, the removal rate tends to be balanced along with the increase of the addition amount, and the reduction of the adsorption amount is inevitably caused. Therefore, in conclusion, the optimal adding amount of the Mg modified biochar is 0.12g/50mL, namely 2.4 g/L.
(3) The influence of the pH value of the solution on the adsorption of P on Mg modified charcoal is explored:
to PO4 3-The initial pH of the adsorption solution with a concentration of 50mg/L of P is adjusted to 2, 3, 5, 6, 7, 9, 11, respectively. 0.1g of Mg modified biochar with the optimal modification ratio is weighed into a 100mL centrifuge tube, and 50mL of the above prepared solution is added respectively. The mixture was shaken at 180rpm at 25 ℃ for 24 h. Filtering with 0.45 μm filter membrane, and measuring PO in the filtrate by ammonium molybdate spectrophotometry4 3--P concentration. Analyzing the change of the adsorption capacity of the Mg modified biochar on P in the solution under the condition of different initial pH values of the solution.
The effect of the initial pH of the solution on Mg-BC adsorption of P is shown in FIG. 5. As can be seen from fig. 4, at pH 1 to 6, the amount of P adsorbed by Mg-BC increases as the pH value increases; when the pH value is 6-11, the adsorption amount of P adsorbed by the Mg modified charcoal is reduced along with the increase of the pH value; the maximum adsorption capacity was 19.73mg/g at pH 6. Meanwhile, when the initial pH of the solution is 3-9, Mg-BC has high adsorption capacity to P. Therefore, Mg-BC has a wider pH adaptation range for P removal.
(4) Explore the Mg modified charcoal in PO4 3--P and NH4 +-adsorption performance of N, P in N-coexisting double-solute solution
Configuring PO4 3-P concentration of 50mg/L, NH4 +Nitrogen and phosphorus mixed solution with N concentration of 0, 10, 30, 50, 70 and 100mg/L respectively, and adjusting the initial value of the solution to 6. 0.1g of Mg-modified biochar (i.e., 20% Mg-BC) in the optimum modification ratio was weighed into a 100mL centrifuge tube, and 50mL of the above-prepared solutions were added, respectively. The mixture was shaken at 180rpm at 25 ℃ for 24 h. Filtering with 0.45 μm filter membrane, and separating with ammonium molybdatePhotometry of PO in filtrate4 3--P concentration, determination of NH in filtrate by salicylic acid-hypochlorite photometry4 +-N concentration. Analysis of Mg modified biochar at different N: adsorption performance to N, P in P mixed solution.
Different N: the adsorption performance of Mg-BC on N, P in the P mixed solution is shown in FIG. 6. As can be seen from FIG. 6- (a), NH in the mixed solution was accompanied4 +Increase in N concentration, PO in the Mixed solution4 3-Gradually decreasing concentration of-P, Mg-BC vs PO4 3-The adsorption capacity of P gradually increases. When the solution does not contain NH4 +The adsorption capacity of Mg-BC on P is 16.92Mg/g when N is zero; when NH in the mixed solution4 +When the concentration of-N is increased to 50Mg/L or more, Mg-BC pairs PO in the mixed solution4 3-The removal rate of-P is more than 90%. When NH in the mixed solution4 +Mg-BC for PO in solution at 100Mg/L of-N4 3-The removal rate of-P is as high as 99.16%, and Mg-BC is used for PO at the moment4 3-The adsorption capacity of-P was 23.98 mg/g. Meanwhile, as shown in FIG. 6- (b), the Mg-BC pair was added to NH in the mixed solution4 +N also has good adsorption properties. Along with NH in the mixed solution4 +Increase in N concentration, Mg-BC vs NH4 +The adsorption capacity of-N increases gradually. When mixing NH in solution4 +Mg-BC on NH in solution at a concentration of-N of 100Mg/L4 +The adsorption capacity of the-N is as high as 17.52 mg/g. Indicating NH in the mixed solution4 +The existence of-N can remarkably promote the PO pair by Mg-BC4 3-Adsorption of P with Mg-BC on NH in the mixed solution4 +N also has a higher adsorption capacity. In conclusion, the Mg-BC has good adsorption performance on N, P in the eutrophic water body and is a good adsorbent with potential for treating the eutrophic water body.

Claims (10)

1. A preparation method of a corncob-loaded magnesium-modified adsorption material is characterized by comprising the following steps:
(1) drying and crushing corncobs, sieving the corncobs by a 1mm sieve to obtain corncob powder, adding the corncob powder into a magnesium salt solution, wherein the mass ratio of magnesium to the corncobs is 20%, then ultrasonically dispersing the mixture at room temperature for 2-6 h, wherein the power of ultrasonic is 150W, and drying the mixture in an oven;
(2) the dried mixture was placed in a muffle furnace at N2Carrying out pyrolysis carbonization under protection, wherein the temperature of the pyrolysis carbonization is 300-500 ℃, the time of the pyrolysis carbonization is 1-2 h, and cooling the inside of the furnace to room temperature;
(3) washing the obtained product with deionized water until supernatant is neutral, and drying in an oven to obtain the corncob-loaded magnesium modified biochar adsorbing material.
2. The method according to claim 1, wherein in the step (1), the magnesium salt is at least one of magnesium chloride, magnesium nitrate and magnesium sulfate.
3. The method of claim 1, wherein the corncobs are dried to a moisture content of less than 3% in step (1).
4. The preparation method according to claim 1, wherein the temperature of the mixture dried in the oven in the step (1) is 60-80 ℃.
5. The preparation method according to claim 1, wherein the temperature for oven drying in the step (3) is 60-80 ℃.
6. The preparation method according to claim 1, wherein in the step (1), the corncobs are washed, rinsed 3 times with deionized water, put into an oven to be dried to remove impurities, and then crushed through a 1mm sieve.
7. A biochar adsorbent produced by the production method according to any one of claims 1 to 6.
8. The application of the biochar adsorbing material prepared by the preparation method of any one of claims 1-6 in the aspect of adsorbing and removing phosphorus and nitrogen in eutrophic water.
9. The application of the biochar adsorbing material as claimed in claim 8, wherein the adding proportion of the biochar adsorbing material to the eutrophic water body is 2.4g/L, and the biochar adsorbing material is prepared into a solution with the initial pH of 3-9.
10. The use as claimed in claim 8 wherein the phosphorus in the eutrophic water body is PO4 3-Nitrogen being NH4 +
CN201911218403.2A 2019-12-03 2019-12-03 Corncob-loaded magnesium-modified adsorption material and preparation method and application thereof Pending CN110756166A (en)

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