CN112588267B - Composite porous carbon capable of efficiently adsorbing mercury and preparation method thereof - Google Patents

Composite porous carbon capable of efficiently adsorbing mercury and preparation method thereof Download PDF

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CN112588267B
CN112588267B CN202011345250.0A CN202011345250A CN112588267B CN 112588267 B CN112588267 B CN 112588267B CN 202011345250 A CN202011345250 A CN 202011345250A CN 112588267 B CN112588267 B CN 112588267B
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porous carbon
bagasse
reaction
mercury
composite porous
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CN112588267A (en
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马年方
李锦荣
陈骏佳
曾建
谭文兴
王庆福
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Institute of Bioengineering of Guangdong Academy of Sciences
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Abstract

The invention discloses a preparation method of composite porous carbon for efficiently adsorbing mercury, which comprises the steps of preparing bagasse-based porous carbon, preparing carboxylated porous carbon, preparing aminated modified bagasse and preparing composite porous carbon.

Description

Composite porous carbon capable of efficiently adsorbing mercury and preparation method thereof
Technical Field
The invention relates to the technical field of porous material preparation, in particular to aminated bagasse composite porous carbon capable of rapidly and high-capacity adsorbing mercury and a preparation method thereof.
Background
Heavy metal ions, particularly mercury and compounds thereof, are highly toxic and volatile neurotoxic agents which are non-degradable, enter the human body through a food chain even at a low concentration, are continuously enriched in the human body and finally affect the health of the human body, so that the removal of heavy metal mercury in the environment is of great concern. In recent years, environmental pollution problems caused by mercury and its compounds have been increasing. Although the existing emission requirements are below 50ppb, the existing mercury removal process still cannot meet the emission requirements, and if the low concentration and trace heavy metal mercury removal in the ultra-clean high-purity reagent are considered, the requirements on the ultra-low concentration are higher, because the lower the concentration is, the more difficult the removal is.
At present, there are many methods for treating mercury-containing solutions, such as chemical precipitation, electrolysis, coagulation, activated carbon adsorption, reduction, electrolysis, etc., but one common disadvantage of these methods is that it is difficult to remove mercury at low concentrations. The ion exchange and chelating adsorption can treat wastewater with heavy metal ions of lower concentration, wherein the chelating fiber is an ion adsorption fiber containing special functional groups, and the chelating fiber adsorbs metal ions by utilizing the special groups on the fiber and has the advantages of high adsorption capacity, good selectivity, easy elution, easy regeneration and the like, and most importantly, the chelating fiber can also effectively adsorb and remove low-concentration mercury, thereby reaching the safety standard of drinking water.
The ultra-clean high-purity reagent is a key process chemical for etching an ultra-large scale integrated circuit, is mainly used for cleaning and corroding chips and silicon wafers, and has very important influence on the yield, electrical performance and reliability of the integrated circuit. Removal of low concentrations or traces of heavy metal ions such as mercury in ultra-clean high purity reagents has been a challenge. The amine-modified fiber material has a higher adsorption capacity, but the adsorption rate needs to be further improved. Among the adsorbents, the porous carbon material has the advantages of three-dimensional communicated pore channels, high specific surface area, high mechanical strength and the like, and particularly the amine modified fiber material can rapidly adsorb heavy metal ions through huge specific surface area and adsorption effect. In the process of industrialization of the adsorption treatment, in order to meet the requirements of industrialization and high-efficiency treatment, on one hand, the contact time of the reagent and the adsorption material needs to be further shortened, which increases the adsorption speed, and on the other hand, the material needs to have high adsorption capacity in order to reduce the frequency of replacing the adsorption material or the adsorption column. Therefore, development of a novel composite porous carbon adsorption material having rapid and high capacity for adsorbing mercury is needed.
Disclosure of Invention
In view of the above, the present invention provides a method for preparing a composite porous carbon capable of efficiently adsorbing mercury, which comprises preparing carboxylated porous carbon with a suitable pore diameter by carbonization, activation, surface activation and carboxylation modification by utilizing a high-efficiency hierarchical porous structure formed by natural evolution of bagasse in a growth process, preparing modified bagasse rich in amino groups by performing surface activation and grafting modification on bagasse, and then reacting the two to prepare an aminated bagasse composite porous carbon material with rapid adsorption capacity and high capacity for mercury ions.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a preparation method of composite porous carbon for efficiently adsorbing mercury comprises the following steps:
(1) Preparation of bagasse-based porous carbon: carbonizing bagasse to obtain carbonized bagasse, then using alkali as an activating agent, mixing the alkali with the carbonized bagasse, calcining, activating, washing with water, and drying to obtain porous carbon;
(2) Preparation of carboxylated porous carbon: reacting the porous carbon with concentrated nitric acid with the mass concentration of 10-12% for 1-5h at the temperature of 40-70 ℃, washing with water, and drying to obtain carboxylated porous carbon for later use;
(3) Preparation of aminated modified bagasse: adding pretreated bagasse into an activated monomer aqueous solution for grafting reaction, introducing nitrogen, heating, sequentially adding Moire salt, hydrogen peroxide and acetic acid as catalysts after the reaction temperature is reached, stirring for reaction, washing a reaction product, steaming to remove homopolymer, washing with deionized water, filtering, and drying to obtain grafted bagasse;
adding amine monomers into the grafted bagasse for amination reaction, and washing, suction filtering and drying after the reaction is finished to obtain aminated modified bagasse for later use;
(4) Preparation of composite porous carbon: adding ultrapure water into the carboxylated porous carbon prepared in the step (2) to prepare a suspension, adding NHS into the suspension, enabling carboxyl groups on the carboxylated porous carbon to be activated by ultrasound, sequentially adding the aminated modified bagasse and EDC prepared in the step (3), reacting at room temperature, filtering, and drying to obtain the composite porous carbon.
It should be noted that the key point of the step (4) is that NHS is added first, NHS cannot be added simultaneously with EDC, and EDC is added after the aminated modified bagasse is added and stirred uniformly, so that the reaction is started.
Preferably, in the above preparation method of a composite porous carbon for efficiently adsorbing mercury, the carbonization temperature in the step (1) is 400-700 ℃, preferably 500-650 ℃, more preferably 500 ℃;
the alkali is an alkaline inorganic substance, preferably potassium hydroxide;
the calcination temperature is 600 to 900 ℃, preferably 600 to 800 ℃, more preferably 600 ℃.
Preferably, in the preparation method of the composite porous carbon for efficiently adsorbing mercury, the reaction condition in the step (2) is that the reaction is carried out for 3 hours at 60 ℃.
Preferably, in the above preparation method of a composite porous carbon for efficiently adsorbing mercury, the pretreatment step in the step (3) is as follows: crushing and screening bagasse, soaking in 2-20% alkali solution for 1-24 hr, and drying.
The beneficial effects of the technical scheme are as follows: the alkali liquor and the surface groups of the activated bagasse can remove most of hemicellulose and lignin in the bagasse.
Preferably, in the preparation method of the composite porous carbon for efficiently adsorbing mercury, in the step (3), the activated monomer is any one of acrylamide, acrylonitrile and glycidyl methacrylate, the concentration of the activated monomer aqueous solution is 6% -18%, and the volume of the activated monomer aqueous solution is 100-1000ml.
Preferably, in the preparation method of the composite porous carbon for efficiently adsorbing mercury, the reaction temperature of the grafting reaction in the step (3) is 40-80 ℃ and the reaction time is 1-6h.
Preferably, in the preparation method of the composite porous carbon for efficiently adsorbing mercury, in the step (3), in every 100ml of the active monomer aqueous solution, the adding amount of the moire salt is 0.02-0.1g, the adding amount of the hydrogen peroxide is 0.2-1ml, the volume percentage of the acetic acid is 0.2-1%, and further preferably, in every 100ml of the active monomer aqueous solution, the adding amount of the moire salt is 0.06g, the adding amount of the hydrogen peroxide is 0.5ml, and the volume percentage of the acetic acid is 0.2-1%.
Preferably, in the preparation method of the composite porous carbon for efficiently adsorbing mercury, the amine monomer in the step (3) is any one or more of ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine and polyethylene polyamine.
Preferably, in the preparation method of the composite porous carbon for efficiently adsorbing mercury, the reaction temperature of the amination reaction in the step (3) is 110-150 ℃ and the reaction time is 1-5h.
Preferably, in the preparation method of the composite porous carbon for efficiently adsorbing mercury, the mass ratio of the carboxylated modified porous carbon to the NHS to the EDC in the step (4) is 20:1:2; the mass ratio of the amination modified bagasse to the carboxylation modified porous carbon is 1:2-2:1.
The beneficial effects of the technical scheme are as follows: the addition amounts of carboxylated modified porous carbon, NHS, EDC and aminated modified bagasse are obtained after a large number of experiments prove that if the addition amounts are beyond the above range, the adsorption capacity of the finally obtained composite porous carbon material to mercury ions can be reduced and the adsorption equilibrium time is prolonged.
Preferably, in the preparation method of the composite porous carbon for efficiently adsorbing mercury, the ultrasonic time in the step (4) is 20-40min, and the room temperature reaction time is 1-3h.
The invention also discloses the composite porous carbon which is prepared by the method and is used for efficiently adsorbing mercury.
Compared with the prior art, the invention discloses the composite porous carbon for efficiently adsorbing mercury and the preparation method thereof, and has the following advantages:
(1) The invention utilizes the high-efficiency hierarchical porous structure formed by natural evolution of bagasse in the growth process, and still retains the porous structure and air passages of natural grading of bagasse after carbonization and activation, and the surface and the inside of the prepared porous carbon contain a plurality of micropores, mesopores and communicating holes, and the communicating holes are beneficial to mass transfer and diffusion of adsorbates and are beneficial to rapid adsorption of mercury ions.
(2) According to the invention, the aminated modified bagasse and the porous carbon are compounded, the porous carbon can quickly attract and adsorb mercury ions on the surface of the porous carbon, the aminated modified bagasse with high amino content has enough effective amino groups to provide high adsorption capacity, and the physical adsorption capture of the porous carbon and the chemical adsorption covalent bonding of the organic amine are utilized to generate synergistic effect to perform dead angle-free efficient adsorption removal on mercury, so that the adsorption removal effect of the bagasse composite porous carbon on mercury is greatly improved.
(3) The invention selects bagasse as the raw material, has low cost, widens the source of the raw material for preparing the high-performance porous carbon, and realizes the effective utilization of resources.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is an adsorption isotherm of the Aminated Bagasse (AB), the Porous Carbon (PC) and the aminated bagasse composite porous carbon (AB & PC) of example 1 for mercury;
FIG. 2 is an adsorption kinetics plot of Aminated Bagasse (AB), porous Carbon (PC), and aminated bagasse composite porous carbon (AB & PC) of example 1;
fig. 3 is a scanning electron microscope image of the aminated bagasse composite porous carbon prepared in example 1.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
1g of bagasse is put into a carbonization furnace, carbonized for 3 hours at 500 ℃, then evenly mixed with 4g of KOH to be used as an activating agent, calcined and activated at 600 ℃, washed and dried. And adding 12% concentrated nitric acid into the obtained porous carbon to react for 3 hours at 60 ℃ to obtain carboxylated porous carbon.
Taking bagasse crushed to 20 meshes, soaking the bagasse in a NaOH solution with the concentration of 5% for 24 hours, and filtering after soaking; 10g of pretreated bagasse is taken, 10mL of acrylamide aqueous solution is added, deionized water is added to 100mL, nitrogen is introduced, the temperature is raised, 0.05g of Moire salt is sequentially added after the reaction temperature is reached, 0.6mL of hydrogen peroxide and 0.4mL of acetic acid are added, and the reaction is carried out for 5 hours at 50 ℃. Washing the reaction product with water, boiling with boiling water to remove homopolymer, washing with deionized water, suction filtering, and drying; 10g of the grafted bagasse is taken, diethylenetriamine is added into the grafted bagasse, the mixture is reacted for 5 hours at 120 ℃, and the aminated modified bagasse is obtained after washing, suction filtration and drying.
Preparing aminated modified bagasse composite porous carbon: adding ultrapure water into 1g of carboxylated modified porous carbon to prepare suspension; adding 50mg of NHS, performing ultrasonic treatment for 30min to activate carboxyl groups on the porous carbon, adding 2g of aminated modified bagasse into the suspension, adding 100mg of EDC, reacting at room temperature for 2h, washing with water, performing suction filtration, and drying to obtain the aminated modified bagasse composite porous carbon.
0.1g of aminated modified bagasse composite porous carbon prepared in the embodiment is added into a series of mercury ion solutions with different initial concentrations, the mixture is put into a shaking table to oscillate for 12 hours, the concentration of residual mercury ions is measured by an intelligent mercury meter, the adsorption capacity of the composite porous carbon material to mercury ions is 1178.5mg/g according to an adsorption isotherm, and the time for reaching adsorption equilibrium is 10min according to a kinetic adsorption curve.
Example 2
1g of bagasse is put into a carbonization furnace to be carbonized for 1h at 700 ℃; taking out and uniformly mixing with 4g of KOH to serve as an activating agent, calcining and activating at 700 ℃, washing and drying, and adding 12% concentrated nitric acid into the obtained porous carbon to react for 5 hours at 40 ℃ to obtain carboxylated porous carbon.
Taking bagasse crushed to 20 meshes, soaking the bagasse in a NaOH solution with the concentration of 5% for 1h, and filtering after soaking; 10g of pretreated bagasse is taken, 6mL of acrylonitrile aqueous solution is added, deionized water is added to 100mL, nitrogen is introduced, the temperature is raised, 0.02g of Moire salt is sequentially added after the reaction temperature is reached, 1.0mL of hydrogen peroxide and 1.0mL of acetic acid are added, and the reaction is carried out for 1h at 80 ℃. Washing the reaction product with water, boiling with boiling water to remove homopolymer, washing with deionized water, suction filtering, and drying; taking 10g of the grafted bagasse, adding tetraethylenepentamine into the grafted bagasse, reacting for 2 hours at 140 ℃, washing with water, filtering with suction, and drying to obtain aminated modified bagasse.
Preparing aminated modified bagasse composite porous carbon: 2g of carboxylated modified porous carbon is taken and added with ultrapure water to prepare suspension; 100mg of NHS is added, the carboxyl on the porous carbon is activated by ultrasonic treatment for 20min, 1g of aminated modified bagasse is added into the suspension, 200mg of EDC is added, and the reaction is carried out for 1h at room temperature. Washing with water, suction filtering and drying to obtain the aminated modified bagasse composite porous carbon.
0.1g of aminated modified bagasse composite porous carbon prepared in the embodiment is added into a series of mercury ion solutions with different initial concentrations, the mixture is put into a shaking table to oscillate for 12 hours, the concentration of residual mercury ions is measured by an intelligent mercury meter, the adsorption capacity of the composite porous carbon material to mercury ions is 926.8mg/g according to an adsorption isotherm, and the time for reaching adsorption equilibrium is 12 minutes according to a kinetic adsorption curve.
Example 3
1g of bagasse is put into a carbonization furnace, carbonized for 2 hours at 600 ℃, evenly mixed with 4g of KOH to be used as an activating agent, calcined and activated at 700 ℃, washed and dried. And adding 12% concentrated nitric acid into the obtained porous carbon to react for 2 hours at 70 ℃ to obtain carboxylated porous carbon.
Taking bagasse crushed to 20 meshes, soaking the bagasse in a NaOH solution with the concentration of 8 percent for 1 hour, and filtering after soaking; 10g of pretreated bagasse is taken, 18mL of glycidyl methacrylate aqueous solution is added, deionized water is added to 100mL, nitrogen is introduced, the temperature is raised, 1.0g of Moire salt is sequentially added after the reaction temperature is reached, 1.0mL of hydrogen peroxide and 0.2mL of acetic acid are added, and the reaction is carried out for 5 hours at 40 ℃. Washing the reaction product with water, boiling with boiling water to remove homopolymer, washing with deionized water, suction filtering, and drying; 10g of the grafted bagasse is taken, diethylenetriamine is added into the grafted bagasse, the mixture is reacted for 1h at 150 ℃, and the aminated modified bagasse is obtained after washing, suction filtration and drying.
Preparing aminated modified bagasse composite porous carbon: adding ultrapure water into 1g of carboxylated modified porous carbon to prepare suspension; 50mg of NHS (polyethylene glycol) is added, the carboxyl on the porous carbon is activated by ultrasonic treatment for 40min, 1g of aminated modified bagasse is added into the suspension, 100mg of EDC is added, and the reaction is carried out for 3h at room temperature. Washing with water, suction filtering and drying to obtain the aminated modified bagasse composite porous carbon.
0.1g of aminated modified bagasse composite porous carbon prepared in the embodiment is added into a series of mercury ion solutions with different initial concentrations, the mixture is put into a shaking table to oscillate for 12 hours, the concentration of residual mercury ions is measured by an intelligent mercury meter, the adsorption capacity of the composite porous carbon material to mercury ions is 1045.5mg/g according to an adsorption isotherm, and the time for reaching adsorption equilibrium is 8min according to a kinetic adsorption curve.
Comparative example 1 (porous carbon)
1g of bagasse is put into a carbonization furnace, carbonized for 3 hours at 500 ℃, then evenly mixed with 4g of KOH to be used as an activating agent, calcined and activated at 600 ℃, washed and dried. And adding 12% concentrated nitric acid into the obtained porous carbon to react for 3 hours at 60 ℃ to obtain carboxylated porous carbon.
Adding 0.1g of bagasse porous carbon prepared in the comparative example into a series of mercury ion solutions with different initial concentrations, putting into a shaking table for shaking for 12 hours, measuring the concentration of residual mercury ions by adopting an intelligent mercury meter, and calculating according to an adsorption isotherm to obtain the adsorption capacity of the composite porous carbon material to mercury ions of 441.9mg/g, wherein the time for reaching adsorption equilibrium is 5min according to a kinetic adsorption curve.
Comparative example 2 (aminated bagasse)
Taking bagasse crushed to 20 meshes, soaking the bagasse in a NaOH solution with the concentration of 5% for 24 hours, and filtering after soaking; 10g of pretreated bagasse is taken, 10mL of acrylamide aqueous solution is added, deionized water is added to 100mL, nitrogen is introduced, the temperature is raised, 0.05g of Moire salt is sequentially added after the reaction temperature is reached, 0.6mL of hydrogen peroxide and 0.4mL of acetic acid are added, and the reaction is carried out for 5 hours at 50 ℃. Washing the reaction product with water, boiling with boiling water to remove homopolymer, washing with deionized water, suction filtering, and drying; 10g of the grafted bagasse is taken, diethylenetriamine is added into the grafted bagasse, the mixture is reacted for 5 hours at 120 ℃, and the aminated modified bagasse is obtained after washing, suction filtration and drying.
0.1g of aminated modified bagasse prepared by the comparative example is taken and added into a series of mercury ion solutions with different initial concentrations, the mixture is put into a shaking table for shaking for 12 hours, the concentration of residual mercury ions is measured by an intelligent mercury meter, the adsorption capacity of the composite porous carbon material to mercury ions is 864.9mg/g according to an adsorption isotherm, and the time for reaching adsorption equilibrium is 30min according to a kinetic adsorption curve.
Comparative example 3 (two-stage amine modified porous carbon)
(1) Preparation of bagasse-based hierarchical porous carbon: carbonizing bagasse at 500deg.C, using KOH as activator (the amount of KOH is 4 times of the weight of bagasse), calcining at 600deg.C, and activating to obtain granules with HNO concentration of 10wt% 3 Washing the solution and distilled water to obtain graded porous carbon;
(2) Surface oxidation activation of bagasse-based hierarchical porous carbon: 10g of graded porous carbon is dissolved in 100ml of acetic acid solution with the concentration of 30% by mass, and 2ml of composite oxidant is added for reaction for 3 hours at 50 ℃, wherein the composite oxidant comprises the following components: ammonium persulfate with the concentration of 20 percent by mass and sulfuric acid solution with the concentration of 10 percent by mass, wherein the solvent is water; washing with water, suction filtering, and drying to obtain the oxygen-containing hierarchical porous carbon.
(3) Preparation of hyperbranched polyamide-amine: 100mL of triethylene tetramine is dissolved in 100mL of methanol, then poured into a three-necked bottle, placed in an ice bath, slowly added dropwise with a mixed solution consisting of 59mL of methyl acrylate and 100mL of methanol, removed by rotary evaporation at 50 ℃ after the dripping is finished, and reacted at 100 ℃ for 24 hours to obtain the hyperbranched polyamide-amine.
(4) Preparation of two-stage amine modified bagasse hierarchical porous carbon: adding 10g of the oxygen-containing porous carbon prepared in the step (2) into a polytetrafluoroethylene reactor filled with 100ml of hyperbranched polyamide-amine, sealing, reacting for 2 hours at 130 ℃, alternately washing with cold water and hot water (the cold water is tap water, and the hot water is water above 80 ℃), filtering, and drying; taking 10g of a dried sample, adding the dried sample into a polytetrafluoroethylene reactor filled with 100ml of triethylene tetramine, sealing, reacting for 1h at 140 ℃, washing the reaction product with water, boiling with boiling water for 10min, washing with deionized water, filtering, and drying.
Adding 0.1g of the two-stage amine modified porous carbon prepared in the comparative example into a series of mercury ion solutions with different initial concentrations, putting into a shaking table for oscillating for 12 hours, measuring the concentration of residual mercury ions by adopting an intelligent mercury meter, and calculating to obtain the adsorption capacity 782.1 mg/g of the composite porous carbon material to mercury ions according to an adsorption isotherm, wherein the time for reaching adsorption equilibrium is 12 minutes according to a kinetic adsorption curve.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the solution disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (5)

1. The preparation method of the composite porous carbon for efficiently adsorbing mercury is characterized by comprising the following steps of:
(1) Preparation of bagasse-based porous carbon: carbonizing bagasse to obtain carbonized bagasse, then using alkali as an activating agent, mixing the alkali with the carbonized bagasse, calcining, activating, washing with water, and drying to obtain porous carbon;
(2) Preparation of carboxylated porous carbon: reacting the porous carbon with concentrated nitric acid with the mass concentration of 10-12% for 1-5h at the temperature of 40-70 ℃, washing with water, and drying to obtain carboxylated porous carbon for later use;
(3) Preparation of aminated modified bagasse: adding pretreated bagasse into an activated monomer aqueous solution for grafting reaction, introducing nitrogen, heating, sequentially adding Moire salt, hydrogen peroxide and acetic acid as catalysts after the reaction temperature is reached, stirring for reaction, washing a reaction product, steaming to remove homopolymer, washing with deionized water, filtering, and drying to obtain grafted bagasse; adding amine monomers into the grafted bagasse for amination reaction, and washing, suction filtering and drying after the reaction is finished to obtain aminated modified bagasse for later use;
(4) Preparation of composite porous carbon: preparing a suspension by adding ultrapure water into the carboxylated porous carbon prepared in the step (2), adding NHS into the suspension, activating carboxyl groups on the carboxylated porous carbon by ultrasonic, sequentially adding the aminated modified bagasse and EDC prepared in the step (3), reacting at room temperature, filtering, and drying to obtain the composite porous carbon;
the pretreatment step in the step (3) is as follows: crushing and screening bagasse, soaking in 2-20% alkali liquor for 1-24h, and drying after soaking;
the activated monomer in the step (3) is any one of acrylamide, acrylonitrile and glycidyl methacrylate, and the concentration of the activated monomer aqueous solution is 6% -18%;
the amine monomer in the step (3) is any one or more of ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine and polyethylene polyamine;
the mass ratio of the carboxylated porous carbon to the NHS to the EDC in the step (4) is 20:1:2; the mass ratio of the aminated modified bagasse to the carboxylated porous carbon is 1:2-2:1;
the ultrasonic time in the step (4) is 20-40min, and the room temperature reaction time is 1-3h.
2. The method for preparing a highly efficient mercury-adsorbing composite porous carbon according to claim 1, wherein the grafting reaction in the step (3) is carried out at a reaction temperature of 40-80 ℃ for 1-6 hours.
3. The method for preparing the composite porous carbon capable of efficiently adsorbing mercury according to claim 1, wherein in each 100ml of the active monomer aqueous solution in the step (3), the adding amount of the moire salt is 0.02-0.1g, the adding amount of the hydrogen peroxide is 0.2-1ml, and the volume percentage of the acetic acid is 0.2-1%.
4. The method for preparing a highly efficient mercury-adsorbing composite porous carbon according to claim 1, wherein the amination reaction in the step (3) is carried out at a reaction temperature of 110-150 ℃ for 1-5 hours.
5. A highly effective mercury-adsorbing composite porous carbon prepared by the method of any one of claims 1-4.
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