CN113477226A - Method for removing trivalent antimony in aqueous solution by using chitosan modified charcoal - Google Patents
Method for removing trivalent antimony in aqueous solution by using chitosan modified charcoal Download PDFInfo
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- 229920001661 Chitosan Polymers 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 45
- FAWGZAFXDJGWBB-UHFFFAOYSA-N antimony(3+) Chemical compound [Sb+3] FAWGZAFXDJGWBB-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 239000007864 aqueous solution Substances 0.000 title claims abstract description 24
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- 239000000243 solution Substances 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 21
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 18
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- 238000002156 mixing Methods 0.000 claims description 15
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- 239000008367 deionised water Substances 0.000 claims description 6
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- 229910001439 antimony ion Inorganic materials 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 5
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- 238000004140 cleaning Methods 0.000 claims description 2
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- 229910052787 antimony Inorganic materials 0.000 abstract description 14
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- 241000196324 Embryophyta Species 0.000 abstract description 3
- DSSYKIVIOFKYAU-XCBNKYQSSA-N (R)-camphor Chemical compound C1C[C@@]2(C)C(=O)C[C@@H]1C2(C)C DSSYKIVIOFKYAU-XCBNKYQSSA-N 0.000 abstract description 2
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- 125000003118 aryl group Chemical group 0.000 description 1
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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
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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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- 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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- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention discloses a method for removing trivalent antimony in an aqueous solution by using chitosan modified biochar, and relates to the technical field of wastewater treatment. The invention comprises the following steps: the method comprises the following steps: crushing, sieving and drying the ficus microcarpa branches, carrying out nano grinding treatment on the dried material to obtain nano powder, and carrying out pyrolysis on the nano powder to obtain charcoal, wherein the ficus microcarpa can be replaced by garden plants such as plane tree, photinia serrulata, cinnamomum camphora and the like; step two: dissolving chitosan in acetic acid solution, and ultrasonically stirring until the chitosan is completely dissolved. The chitosan modified charcoal greatly improves the adsorption performance to the trivalent antimony, has higher adsorption stability, reduces secondary pollution, has better environmental benefit and economic benefit for reducing antimony pollution in water, realizing resource utilization of waste and the like, and solves the problems that the existing charcoal has weaker adsorption capacity to the trivalent antimony in aqueous solution and has low removal rate.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for removing trivalent antimony in an aqueous solution by using chitosan modified biochar.
Background
Antimony (Sb) is a metalloid having a chemical property similar to that of arsenic, and is widely used in various industrial fields including dyes, batteries, semiconductors, flame retardant materials, etc., and it is reported that the antimony yield in 2019 of China is about 9.6 ten thousand tons/year, which accounts for more than 60% of the global antimony yield. When a large amount of antimony-containing products are produced and applied, the antimony content in wastewater in many places in China is seriously over-standard, and the antimony pollution of a water body is considered as a new environmental pollution problem in recent years. The toxicity of antimony is closely related to its chemical valence, and in water, antimony exists mainly in the forms of Sb (III) and Sb (V), the toxicity of the former is 10 times that of the latter, and the two forms of antimony can be mutually converted. If the human body takes antimony for a long time, diseases including endocrine, cardiovascular, nervous system and reproductive system can be caused, and the health of the human body is seriously harmed. The currently common methods for removing antimony in water mainly comprise a membrane filtration method, a precipitation method, an ion exchange method and an adsorption method. Among them, the adsorption method has the characteristics of low price, high efficiency, simple operation and the like, and is considered to be a sustainable and practical industrialized application method. Therefore, the method for preparing the adsorbent with low cost, wide production material source and excellent adsorption performance has key practical application significance.
The biochar is an aromatic solid product prepared from biomass waste under the condition of limited oxygen by utilizing an efficient pyrolysis technology. The charcoal has the advantages of good pore structure, high stability, rich functional groups and the like, so that the charcoal has great potential in adsorbing heavy metals in wastewater. The ficus microcarpa is a typical urban garden plant in south China, garden wastes such as branches, fallen leaves and grass scraps generated in greening maintenance management not only cause resource waste, but also become a potential environmental problem for treatment of the wastes. The branches of the ficus microcarpa are prepared into charcoal, so that the pressure of garden waste on the environment is relieved, and the charcoal can be used as an adsorbent for treating pollutants (such as antimony and the like) in wastewater. However, the adsorption capacity of the original biochar is limited by the nature of the original biochar, and the restoration effect of the polluted water body is limited. The chitosan molecule has abundant hydroxyl and amino, has stronger maneuvering capability of chelating heavy metal, and particularly has positive charge to adsorb Sb (III) existing in the form of anions in water through electrostatic action. Therefore, the biological carbon and the chitosan are functionally combined through a modification means, and the advantages of the biological carbon and the chitosan can be integrated, so that the adsorption capacity and the removal effect of the biological carbon on Sb (III) in water are improved.
Disclosure of Invention
The invention aims to provide a method for removing trivalent antimony in an aqueous solution by using chitosan modified biochar, which greatly improves the adsorption performance to Sb (III), has low preparation cost, safe method and simple process, has high removal rate to Sb (III) in wastewater, can effectively realize industrial production, and solves the problems that the existing biochar has weak adsorption capacity to trivalent antimony in the aqueous solution and has low removal rate.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a method for removing trivalent antimony in an aqueous solution by utilizing chitosan modified biochar, which comprises the following steps:
the method comprises the following steps: crushing, sieving and drying the ficus microcarpa branches, carrying out nano grinding treatment on the dried material to obtain nano powder, and carrying out pyrolysis on the nano powder to obtain charcoal, wherein the ficus microcarpa can be replaced by garden plants such as plane tree, photinia serrulata, cinnamomum camphora and the like;
step two: dissolving chitosan in acetic acid solution, and ultrasonically stirring until the chitosan is completely dissolved;
step three: stirring a part of biochar with the solution, and uniformly mixing by ultrasonic to obtain a mixed solution;
step four: adding a cross-linking agent into the mixed solution, adding a sodium hydroxide solution, carrying out ultrasonic mixing uniformly, then adding the other part of biochar, heating the mixed solution to 50-60 ℃ through microwave heating equipment, and carrying out heat preservation for 30min, wherein the ultrasonic equipment is used for mixing uniformly;
step five: cooling and standing, filtering, cleaning, drying and grinding the obtained product to obtain chitosan modified biochar;
step six: adding the obtained modified biochar into wastewater, fully contacting the modified biochar with the wastewater under stirring equipment, completely adsorbing trivalent antimony ions in the wastewater, and filtering the wastewater to obtain a purified aqueous solution.
Furthermore, when the nano-grinding treatment is carried out in the first step, a large amount of mechanical energy is applied to the material so as to change the crystal lattice and the surface property of the material particles to be in an activated state.
Further, the specific method of pyrolysis in the first step is as follows: heating the nano powder in a pyrolysis device to 500 ℃ at a heating rate of 15 ℃/min, keeping for 2h, cooling and taking out to obtain unmodified biochar.
Further, the deacetylation degree of the chitosan in the second step is more than 75%.
Further, the mass ratio of chitosan to biochar in the chitosan modified biochar is set as 1: (1-5).
Further, the mass ratio of the biochar added in the third step and the biochar added in the fourth step is set to be 7: 3.
Further, the stirring time in the third step is set to be 30-45 min.
Further, the cross-linking agent in the fourth step is set to be glutaraldehyde solution.
Further, the standing time in the fifth step is set to be 16-24 hours.
And further, washing the standing product obtained in the fifth step for three times by using deionized water, drying, grinding and sieving by using a 50-100-mesh sieve to obtain the chitosan modified biochar.
The invention has the following beneficial effects:
1. compared with unmodified charcoal, the chitosan modified charcoal has richer surface functional groups, greatly improves the adsorption performance to Sb (III), has the adsorption capacity of 86-168mg/g and 10mg/g of unmodified charcoal, is green and environment-friendly, and provides a new idea for treating antimony-containing wastewater.
2. The preparation raw materials of the invention have rich sources, the garden waste is fully utilized, and the problems of resource waste, environmental pollution and the like caused by improper treatment such as accumulation incineration and the like can be reduced.
3. The chitosan modified biochar disclosed by the invention is low in preparation cost, safe in method and simple in process, is assisted by new technologies such as ultrasound, microwave and nano technologies, and is added in a sectional manner, so that the biochar can be fully contacted with a chitosan solution, the quality of the prepared modified biochar is greatly improved, the modified biochar has a high removal rate of Sb (III) in wastewater, and industrial production can be effectively realized.
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 Fourier infrared spectrum of biochar of examples 1-3 of the present invention and comparative example 1;
FIG. 2 is a graph showing adsorption kinetics of biochar of examples 1 to 3 of the present invention and comparative example 1 to Sb (III);
FIG. 3 is adsorption isotherms of biochar of examples 1 to 3 of the present invention and comparative example 1 for Sb (III);
fig. 4 is a graph of the removal efficiency of sb (iii) by 3 times of desorption of chitosan-modified biochar in example 3 of the present invention.
In the figure, BC is unmodified biochar; CH (CH)0.2BC is the chitosan-modified biochar of example 1; CH (CH)0.5BC is the chitosan-modified biochar of example 2; CH (CH)1BC is the chitosan-modified biochar of example 3.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
A method for removing trivalent antimony in an aqueous solution by utilizing chitosan modified biochar comprises the following steps:
the method comprises the following steps: crushing, screening and drying ficus microcarpa branches, carrying out nano grinding treatment on the dried material to obtain nano powder, applying a large amount of mechanical energy to the material to change the crystal lattice and surface property of material particles to enable the material particles to be in an activated state when carrying out nano grinding treatment, heating the nano powder to 500 ℃ at a heating rate of 15 ℃/min in a pyrolysis device, keeping the temperature for 2 hours, cooling and taking out to obtain unmodified biochar;
step two: dissolving chitosan in 2.5% acetic acid solution, the deacetylation degree of the chitosan is more than 75%, and ultrasonically stirring until the chitosan is completely dissolved;
step three: stirring a part of biochar with the solution for 30min, and uniformly mixing by ultrasonic to obtain a mixed solution;
step four: adding 3mL of glutaraldehyde solution cross-linking agent into the mixed solution, adding 1% of sodium hydroxide solution, ultrasonically mixing uniformly, then adding the other part of biochar, setting the mass ratio of the biochar added in the two times to be 7:3, heating the mixed solution to 50 ℃ through microwave heating equipment, preserving heat for 30min, and uniformly mixing through ultrasonic equipment in the process;
step five: and (2) after cooling and standing for 16h, filtering the obtained product, washing for three times by using deionized water, drying, grinding and sieving by using a 50-100-mesh sieve to obtain the chitosan modified biochar, wherein the mass ratio of chitosan to biochar is set as 1: 5;
step six: adding the obtained modified biochar into wastewater, fully contacting the modified biochar with the wastewater under stirring equipment, completely adsorbing trivalent antimony ions in the wastewater, and filtering the wastewater to obtain a purified aqueous solution.
Example 2
A method for removing trivalent antimony in an aqueous solution by utilizing chitosan modified biochar comprises the following steps:
the method comprises the following steps: crushing, screening and drying ficus microcarpa branches, carrying out nano grinding treatment on the dried material to obtain nano powder, applying a large amount of mechanical energy to the material to change the crystal lattice and surface property of material particles to enable the material particles to be in an activated state when carrying out nano grinding treatment, heating the nano powder to 500 ℃ at a heating rate of 15 ℃/min in a pyrolysis device, keeping the temperature for 2 hours, cooling and taking out to obtain unmodified biochar;
step two: dissolving chitosan in 2.5% acetic acid solution, the deacetylation degree of the chitosan is more than 75%, and ultrasonically stirring until the chitosan is completely dissolved;
step three: stirring a part of biochar with the solution for 40min, and uniformly mixing by ultrasonic to obtain a mixed solution;
step four: adding 3mL of glutaraldehyde solution cross-linking agent into the mixed solution, adding 1% of sodium hydroxide solution, ultrasonically mixing uniformly, then adding the other part of biochar, setting the mass ratio of the biochar added in the two times to be 7:3, heating the mixed solution to 55 ℃ through microwave heating equipment, preserving heat for 30min, and uniformly mixing through ultrasonic equipment in the process;
step five: and (2) after cooling and standing for 20h, filtering the obtained product, washing for three times by using deionized water, drying, grinding and sieving by using a 50-100-mesh sieve to obtain the chitosan modified biochar, wherein the mass ratio of chitosan to biochar is set as 1: 2;
step six: adding the obtained modified biochar into wastewater, fully contacting the modified biochar with the wastewater under stirring equipment, completely adsorbing trivalent antimony ions in the wastewater, and filtering the wastewater to obtain a purified aqueous solution.
Example 3
A method for removing trivalent antimony in an aqueous solution by utilizing chitosan modified biochar comprises the following steps:
the method comprises the following steps: crushing, screening and drying ficus microcarpa branches, carrying out nano grinding treatment on the dried material to obtain nano powder, applying a large amount of mechanical energy to the material to change the crystal lattice and surface property of material particles to enable the material particles to be in an activated state when carrying out nano grinding treatment, heating the nano powder to 500 ℃ at a heating rate of 15 ℃/min in a pyrolysis device, keeping the temperature for 2 hours, cooling and taking out to obtain unmodified biochar;
step two: dissolving chitosan in 2.5% acetic acid solution, the deacetylation degree of the chitosan is more than 75%, and ultrasonically stirring until the chitosan is completely dissolved;
step three: stirring a part of biochar with the solution for 45min, and uniformly mixing by ultrasonic waves to obtain a mixed solution;
step four: adding 3mL of glutaraldehyde solution cross-linking agent into the mixed solution, adding 1% of sodium hydroxide solution, ultrasonically mixing uniformly, then adding the other part of biochar, setting the mass ratio of the biochar added in the two times to be 7:3, heating the mixed solution to 60 ℃ through microwave heating equipment, preserving heat for 30min, and uniformly mixing through ultrasonic equipment in the process;
step five: and cooling and standing for 24h, filtering the obtained product, washing for three times by using deionized water, drying, grinding and sieving by using a 50-100-mesh sieve to obtain the chitosan modified biochar, wherein the mass ratio of chitosan to biochar is set as 1: 1;
step six: adding the obtained modified biochar into wastewater, fully contacting the modified biochar with the wastewater under stirring equipment, completely adsorbing trivalent antimony ions in the wastewater, and filtering the wastewater to obtain a purified aqueous solution.
Comparative example 1
The preparation method of the unmodified biochar of the comparative example comprises the following steps:
the method comprises the following steps: drying, crushing and sieving the ficus microcarpa branches to obtain biomass;
step two: and heating the dried raw material to 500 ℃ in a pyrolysis device at a heating rate of 15 ℃/min, keeping for 2h, cooling, and taking out to obtain unmodified Biochar (BC).
FIG. 1 is a Fourier infrared spectrum of chitosan-modified biochar prepared in examples 1-3 and unmodified biochar prepared in comparative example 1. As can be seen from the figure, chitosan modified biochar (CH)0.2BC、CH0.5BC、CH1BC) has more functional group species than unmodified Biochar (BC), increasing with increasing chitosan application.
Elemental analysis was performed on the chitosan-modified biochar prepared in examples 1 to 3 and the unmodified biochar prepared in comparative example 1, and table 1 shows the elemental compositions and atomic ratios of the different biochar. The unmodified biochar mainly comprises two elements of C and O, and the content of the rest elements is low. With the increase of the chitosan loading amount, the C content of the biochar is gradually reduced, and the N content is gradually increased, which indicates that the nitrogen-containing functional groups of the chitosan are introduced into the biochar.
TABLE 1 elemental composition of unmodified biochar and chitosan-modified biochar
The application of the chitosan modified charcoal in removing trivalent antimony in aqueous solution comprises the following steps:
first, maximum adsorption test experiment
Respectively adding the chitosan modified biochar prepared in examples 1-3 and the unmodified biochar prepared in comparative example 1 into Sb (III) solutions with different concentrations, wherein the adding amount of the biochar is 2 g/L; the initial pH of the Sb (III) solution is 2; the initial concentration of the Sb (III) solution is 0-400 mg/L; the adsorption time was 24 h.
FIG. 2 is adsorption isotherms of biochar of examples 1-3 and comparative example 1 for Sb (III). The maximum adsorption amounts of the chitosan modified biochar to Sb (III) are 86, 115 and 168mg/g respectively according to the Langmuir model fitting, and are obviously larger than that of the unmodified biochar (10 mg/g).
Second, adsorption Rate experiment
Respectively adding the chitosan modified biochar prepared in examples 1-3 and the unmodified biochar prepared in comparative example 1 into an Sb (III) solution with the initial concentration of 40mg/L, wherein the adding amount of the biochar is 2 g/L; the initial pH of the Sb (III) solution is 2; the adsorption time is 0-24 h.
FIG. 3 is a graph showing adsorption kinetics of biochar of examples 1 to 3 and comparative example 1 to Sb (III). After adsorbing for 15min, the removal rate of the chitosan modified biochar in example 1 to the Sb (III) solution reaches 33.7%; the removal rate of the chitosan modified biochar in example 2 to the Sb (III) solution reaches 51.1%; the removal rate of the chitosan modified biochar in example 3 to the Sb (III) solution reaches 69.1 percent; and the removal rate of the unmodified biochar to Sb (III) is only 6.2 percent. The adsorption rate is improved along with the increase of the addition amount of the chitosan, which shows that the adsorption of the chitosan modified carbon to Sb (III) is mainly a rapid adsorption process, and the chitosan is taken as an adsorption site to perform chemical adsorption.
Third, adsorption stability experiment
Fig. 4 shows the removal efficiency of the chitosan-modified biochar in example 3 on sb (iii) after 72h of deionized water desorption. After 72h of desorption, the removal efficiency of the chitosan biochar on Sb (III) can still reach 70.0 percent, which shows that the chitosan modified biochar has high adsorption stability on Sb (III), is not easy to desorb and avoids secondary pollution.
The above are only preferred embodiments of the present invention, and the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made to the technical solutions described in the above embodiments, and to some of the technical features thereof, are included in the scope of the present invention.
Claims (10)
1. A method for removing trivalent antimony in an aqueous solution by utilizing chitosan modified biochar is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: crushing, sieving and drying the ficus microcarpa branches, carrying out nano grinding treatment on the dried material to obtain nano powder, and pyrolyzing the nano powder to obtain charcoal;
step two: dissolving chitosan in acetic acid solution, and ultrasonically stirring until the chitosan is completely dissolved;
step three: stirring a part of biochar with the solution, and uniformly mixing by ultrasonic to obtain a mixed solution;
step four: adding a cross-linking agent into the mixed solution, adding a sodium hydroxide solution, carrying out ultrasonic mixing uniformly, then adding the other part of biochar, heating the mixed solution to 50-60 ℃ through microwave heating equipment, and carrying out heat preservation for 30min, wherein the ultrasonic equipment is used for mixing uniformly;
step five: cooling and standing, filtering, cleaning, drying and grinding the obtained product to obtain chitosan modified biochar;
step six: adding the obtained modified biochar into wastewater, fully contacting the modified biochar with the wastewater under stirring equipment, completely adsorbing trivalent antimony ions in the wastewater, and filtering the wastewater to obtain a purified aqueous solution.
2. The method for removing trivalent antimony from water solution by using chitosan modified biochar as claimed in claim 1, wherein during the nano-grinding treatment in the first step, a large amount of mechanical energy is applied to the material to change the crystal lattice and surface properties of the material particles to be activated.
3. The method for removing the trivalent antimony in the aqueous solution by using the chitosan modified biochar as claimed in claim 1, wherein the specific method for pyrolysis in the first step is as follows: heating the nano powder in a pyrolysis device to 500 ℃ at a heating rate of 15 ℃/min, keeping for 2h, cooling and taking out to obtain unmodified biochar.
4. The method for removing trivalent antimony from an aqueous solution by using chitosan modified biochar as claimed in claim 1, wherein the degree of deacetylation of chitosan in the second step is more than 75%.
5. The method for removing the trivalent antimony in the aqueous solution by using the chitosan modified biochar as claimed in claim 1, wherein the mass ratio of the chitosan to the biochar in the chitosan modified biochar is set to be 1: (1-5).
6. The method for removing the trivalent antimony in the water solution by using the chitosan modified biochar as claimed in claim 1, wherein the mass ratio of the biochar added in the third step and the fourth step is set to be 7: 3.
7. The method for removing the trivalent antimony in the aqueous solution by using the chitosan modified biochar as claimed in claim 1, wherein the stirring time in the third step is set to be 30-45 min.
8. The method for removing the trivalent antimony in the water solution by using the chitosan modified biochar as claimed in claim 1, wherein the cross-linking agent is set to be glutaraldehyde solution in the fourth step.
9. The method for removing the trivalent antimony in the aqueous solution by using the chitosan modified biochar as claimed in claim 1, wherein the standing time in the fifth step is set to be 16-24 h.
10. The method for removing trivalent antimony from an aqueous solution by using chitosan modified biochar as claimed in claim 1, wherein the chitosan modified biochar is obtained by washing the standing product obtained in the fifth step with deionized water for three times, drying, grinding and sieving with a 50-100 mesh sieve.
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