KR20200022909A - Method for preparing cesium-absorbent element having Prussian blue on the surface by reforming the surface of powder activated carbon using covalent organic polymer - Google Patents

Abstract

The present invention relates to: a method for reforming powdered activated carbon by using a polymer and forming a Prussian blue on the surface of powdered activated carbon; and an adsorbent material having cesium adsorption capacity through the same. When a powdered activated carbon cesium adsorption material according to the present invention is used, as many Prussian blues are fixed to the adsorption material, a high adsorption effect on cesium is exhibited.

Description

Method for preparing cesium-absorbent element having Prussian blue on the surface by reforming the surface of powder activated carbon using covalent organic polymer}

The present invention relates to a method of modifying powdered activated carbon with a polymer, forming a Prussian blue on the surface of the powdered activated carbon, and an adsorption material having cesium adsorption capacity therethrough.

Radioactive accidents are accidents left at nuclear-related facilities such as nuclear power plants, and radioactive materials leak into the atmosphere and water, causing polluted air to spread through the wind, polluting land, grasses, and crops. By polluting the rivers and rivers, it pollutes drinking water, causing catastrophic damage to humans as well as ecosystems. If a radioactive material leaks and the radiation is exposed to the human body or enters the body through ingestion or inhalation, the radioactive material moves to the thyroid, bone marrow, etc., and continues to emit radiation in the body until it disappears during the half-life of the radioactive material. It causes fatal problems for humans and nature, such as cell or genetic modification, which causes DNA to be destroyed.

Even if only 10 grams of cesium, a radioactive substance, is introduced into the Paldang Dam, which is connected to the Han River drinking water source, the drinking water cannot be used as a drinking water source exceeding the drinking water standard for human consumption. As a result of the overall disaster situation expected, initial response measures are required within 24 hours of an accident, and technology development is urgently needed. Until now, research on the removal of radioactive cesium in water has been conducted using ¹³³ Cs, which is similar in chemical behavior to radioactive cesium ¹³⁷ Cs, and researches on ion exchange and membrane filtration techniques are being conducted. However, such technologies require high cost and therefore, more economical removal technology is required. In order to remove cesium ions in water, researches on the development of adsorbents such as ion exchange resins, natural clay minerals and Prussian blue have been actively conducted.

Accordingly, the present inventors modified the surface of the powdered activated carbon with a covalent organic polymer (COP), so that Prussian blue having high adsorption to cesium is formed in the pores of COP to induce stable adsorption with cesium in water and The cesium adsorption material can be completed to prevent secondary contamination due to the leakage of.

An object of the present invention is to provide a method for reforming powdered activated carbon into a polymer, forming a Prussian blue on the surface of the powdered activated carbon, and an adsorption material having cesium adsorption capacity therethrough.

In order to achieve the above object, the present invention provides a method of modifying the surface of the powdered activated carbon with a polymer and forming Prussian blue on the surface of the powdered activated carbon.

The present invention also comprises the steps of (a) oxidizing the powdered activated carbon to produce an activated carbon having a carboxyl group on the surface of the powdered activated carbon; (b) reacting the activated carbon oxide with thionyl chloride to form an acyl chloride group on the surface of the activated carbon oxide; (c) grafting the activated carbon with a polymer to prepare powdered activated carbon modified with a polymer; (d) growing additional polymers on the surface of the powdered activated carbon particles modified with the polymers; And (e) reacting the powdered activated carbon with iron (III) chloride and potassium ferrocyanide solution in situ, thereby providing a method of preparing an adsorbent material having Prussian blue formed on the surface of powdered activated carbon. .

 In the present invention, the adsorbent material may be characterized in that the outflow of Prussian blue in water is suppressed.

In the present invention, the polymer may be characterized in that the melamine.

The present invention also provides a method for removing cesium by using an adsorbent material prepared by the above method.

Prussian blue is a dye-based material that can be selectively adsorbed on radioactive cesium and is known to have high radioactive cesium adsorption efficiency. PB is a material having a face-centered cubic lattice structure, which provides a uniform lattice space through which metal ions and cyano groups can adsorb cations. PB contains K ⁺ ions inside this lattice space. Dissolved cesium in water has a ionic radius of 1.19 Å, which is smaller than 1.25 반경, the ionic radius of K ⁺ ions in the PB lattice space, and allows for selective adsorption of cesium due to the lattice structure of PB. In addition, PB can adsorb dissolved cesium ions to the hydrophilic space by adsorbing covalently bound water molecules and proton exchange of coordinated water molecules in the lattice. However, PB is difficult to recover after being used for adsorption and has a risk of causing secondary environmental pollution. For this reason, research is being conducted to fix PB to polyvinyl alcohol, carbon nanotube, magnetite, alginate, and natural materials / minerals. However, research on the desorption of PB is insufficient, and thus a study for preventing resorption of PB bound to the support through various methods is required.

When the powdered activated carbon used in the present invention is used in a water treatment process, the powdered activated carbon may be sprayed evenly and then dispersed in water to effectively adsorb and remove the radioactive material included in the water treatment target.

When the powdered activated carbon used in the present invention is used in a water treatment process, the powdered activated carbon may be sprayed evenly and then dispersed in water to effectively adsorb and remove the radioactive material included in the water treatment target.

The covalent organic polymer (COP) used in the present invention is bonded to the surface of the powdered activated carbon so that Prussian blue can be formed. In this embodiment, melamine is used as the polymer, but not limited thereto. Other polymers may be used to make blue in situ synthesis.

The covalent organic polymer (COP) used in the present invention is a chain-type polymer formed by a synthetic method such as a step exchange reaction of hexahydropyrazine and cyanuric chloride, immobilization of aromatic nitro and aliphatic amine, and the like. It was synthesized in the form of a shell of a mesh with pores of several nanometers on the surface of activated carbon particles. This creates a rich adsorption-absorption surface area on the adsorbent surface.

In the present invention, Prussian blue synthesis was synthesized in the pores of the covalent organic polymer (COP) synthesized on the surface of the powdered activated carbon. After immersion in iron (III) chloride solution, potassium ferrocyanide solution was injected and proceeded in situ method to prevent Prussian blue from leaking after it was used for adsorption.

In the present invention, the Prussian blue immobilization was simultaneously performed by the physico-chemical method during the synthesis of the adsorbent. The iron (III) chloride solution and potassium ferrocyanide solution are sequentially reacted in the pores of a covalent organic polymer (COP) bonded to the surface of the support particles in the order of several nanometers to physically capture Prussian blue. . At the same time, iron (III) ions are adsorbed by the amine group in the functional group of the melamine polymer, and potassium ferrocyanide is sequentially reacted to chemically fix the Prussian blue.

When the powder activated carbon cesium adsorption material surface-modified with the polymer according to the present invention to form Prussian blue is used, the binding of the Prussian blue to the adsorption material is stabilized, and the degree of Prussian blue leakage by washing is reduced, and many Prussians As blue is fixed to the adsorption material, it shows a high adsorption effect on cesium.

1 is a schematic diagram of a COP-PAC-PB synthesis (in-tisu) process.
2 is a TEM image of (a) PAC and (b) COP-PAC.
Figure 3 shows the results of FT-IR analysis of PAC, Ox-PAC, Mel-PAC and COP-PAC.
4 is an XRD pattern of PAC, COP-PAC and COP-PAC-PB.
5 shows FT-IR spectral results of COP-PAC (red) and COP-PAC-PB (black).
Figure 6 shows the results of analyzing the BET surface area of PAC (black), COP-PAC (red) and COP-PAC-PB (blue).
Figure 7 shows the desorption analysis of Prussian blue upon washing of (a) PAC-PB, (b) Ox-PAC-PB, (c) COP-PAC-PB.
8 is an adsorption-desorption isotherm of COP-PAC-PB particles.
9 shows emission level spectra before and after performing adsorption experiments.

Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are only for illustrating the present invention in more detail, and it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples according to the gist of the present invention. .

Preparation of the ingredients

Materials were prepared as follows to prepare COP-PAC: PAC (SAMCHUN), nitric acid (SHOWA, HNO ₃ , 60%), sulfuric acid (SAMCHUN, H ₂ SO ₄ , 33%), dichloromethane (SAMCHUN, CH ₂ Cl ₂ , 99% ~), thionyl chloride (DAEJUNG, SOCl ₂ , 99%), melamine (SAMCHUN, C ₃ H ₆ N ₆ , 99%), dimethyl sulfoxide (SAMCHUN, (CH ₃ ) ₂ SO , 99%), diisopropyleneamine (SAMCHUN, C ₈ H ₁₉ N, 99%), terephthalhydr (Sigma aldrich, C ₆ H ₄ (CHO) ₂ , 99%), acetone (C ₃ H ₆ O, 99 %) And ethanol (SAMCHUN, C ₂ H ₆ O, 70%). In addition, for preparing COP-PAC-PB, a solution of iron (III) chloride (SAMCHUN, FeCl ₃ , 97%) and potassium ferrocyanide (SAMCHUN, K ₄ Fe (CN) ₆ .3H ₂ O, 99%) was in situ. Reacted in a manner. Cesium chloride (Samium chloride, SAMCHUN, CsCl, 99.0%) and radioactive cesium (Cs-137) standard source solution prepared by Korea Research Institute of Standards and Science (KRISS) were prepared.

Synthesis of COP-PAC

Powder activated carbon (COP-PAC) whose surface was modified with polymer was synthesized through four steps. In one step, 20% PAC was reacted for 24 hours in 500 mL of aqua regia mixed with 40% nitric acid and 45% sulfuric acid in a 3: 1 ratio. The reaction solution was washed with tertiary distilled water until it reached neutral pH, and then dried in a vacuum oven at 110 ° C. for 12 hours to synthesize activated carbon (Ox-PAC). In step 2, 2.5 g of Ox-PAC was added to a solution of 400 mL of dichloromethane and 100 mL of thionyl chloride and reacted at 35 ° C. for 24 hours. The solution was then rotary evaporated using a rotary evaporator to give Thio-PAC from the synthesized compound. In three steps, 2.5 g of Thio-PAC 0.375 g 2.5 g were immediately reacted with 150 mL of melamine, 2.5 mL of dimethylsulfoxide and diisopropylethylamine (melamine was completely dissolved in solution by ultrasonic injection in the bath), and the mixed solution was nitrogen gas. The reaction was carried out at 120 ° C. for 24 hours. PAC particles were washed with dimethylsulfoxide, tertiary distilled water and ethanol (three times with each solution) through solid-liquid separation, and dried in a vacuum oven at 110 ° C. for 12 hours to synthesize Mel-PAC. In the final step, 500 mg of melamine and 800 mg of terephthalaldehyde were mixed with 150 mL of dimethylsulfoxide and completely dissolved by sonication in a water bath to synthesize COP-PAC by attaching COP to PAC particles. Mel-PAC 1000 mg was then mixed with the solution and reacted for 48 hours at 150 ° C. in nitrogen gas. The synthesized COP-PAC was separated from the solution and thoroughly washed in sequence with dimethyl sulfoxide, acetone, tertiary distilled water and ethanol (three times with each solution). Thereafter, PAC was dried in a vacuum oven at 110 ° C. for 12 hours to synthesize COP-PAC.

Prussian blue formation of COP modified / unmodified powdered activated carbon

Synthesis of Prussian blue was done by in situ method as shown in FIG. First, 5 g of each of the PAC, Ox-PAC and COP-PAC particles were reacted in 50 mL of iron (III) chloride (FeCl ³ ) and magnetically stirred at 100 rpm for one day. Centrifuges (4000 rpm, 10 minutes) were used to separate the solids and liquids of the mixed solution. Thereafter, the separated solid was mixed with 50 mL of 20 mM potassium ferricyanide and reacted for 5 minutes. The solid and liquid of the mixed solution were separated again using a centrifuge (4000 rpm, 10 minutes), the solid was washed several times with tertiary distilled water and then dried at 60 ° C. for 6 hours in a drying oven. The PB concentration of the wash water was measured using a UV-Vis spectrophotometer to confirm the desorption of Prussian blue of synthesized modified activated carbon (COP-PAC) and unmodified powdered activated carbon (PAC and Ox-PAC).

Characterization of COP-PAC-PB Particles

Use a transmission electron microscope (JEOL, JEM-2010, Japan) operating at 300 kV to analyze the surface properties of PAC and COP-PAC particles, and use an energy dispersion spectroscopy (EDS) and elemental analyzer (Thermo, Flash2000, Germany) The element content constituting each adsorbent generated in each step was analyzed. XRD analysis (Rigaku, SmartLab, Japan) and FT-IR analysis (Thermo, Nicolet iS50) of the samples were carried out at room temperature, the spectral range was from 15 to 75 degrees and 500 to 3000 cm-1. Specific surface area and pore distribution analyzers (BEL, BELSORP-max, Japan) were used to determine the Brunauer-Emmett-Teller (BET) surface area and average pore size of PAC, COP-PAC and COP-PAC-PB. In order to confirm the desorption of Prussian blue synthesized in the COP pores by the in situ method, desorption characteristics were analyzed using UV spectra (BioChrom, Libara S22, USA).

Isothermal adsorption experiment of COP-PAC-PB

PB was held in nanometer-sized pores of COP synthesized on the surface of PAC particles. All adsorption experiments were performed at room temperature using polypropylene falcon tubes (15 mL). Stock solution (1000 mg L-1) was prepared using CsCl and diluted for use in the experiment. After injecting COP-PAC-PB (0.01 to 5 g) into 50 mL of 10 mg L-1 (ppm) solution of Cs and reacting for 24 hours, the Cs adsorption efficiency of COP-PAC-PB was determined by ICP-MS (Perkin- Elmer, Nexion 350D, USA). To measure the radioactive cesium removal effect (Cs-137) of COP-PAC-PB, 200 mL of distilled water containing radioactive cesium 600 Bq was reacted with 0.1 g of COP-PAC-PB in a radiation detection tube for 24 hours. Radiation was measured using a radiation monitor (Nucare, RAD IQ FS200, Korea) with a 3 × 3 inch Nal detector, MCA and digital MCA mounted in a 20 mm thick lead-lining storage container.

Characterization of COP-PAC-PB Polymer

First, Oxy-PAC was synthesized by reacting powdered activated carbon (PAC) particles in aqua regia (nitric acid 3: sulfuric acid 1) for 24 hours. Once the carboxyl group is highly saturated at the surface of the PAC particles, it reacts in a 2: 1 ratio under reflux in a solution of dichloromethane (CH ₂ Cl ₂ ) and thionyl chloride (SOCl ₂ ) and has a highly reactive acyl chloride substituent Was converted to. The solvent used for the synthesized Thio-PAC particles was evaporated using a rotary evaporator and the next process was immediately performed to prevent hydrolysis of acyl chloride due to air or moisture. Mel-PAC was synthesized by reacting a dimethyl sulfoxide solution in which thio-PAC and melamine were completely dissolved. In this process, melamine was grafted onto the surface of activated carbon particles that formed amide bonds and converted to acyl chloride in the carboxyl group. Thus, the amine group of melamine produced a shell form of COP. COP-PAC was synthesized through the growth of melamine by terephthalaldehyde based on the Schiff-base network, as in previous studies. After synthesis, COP-PAC was washed to remove monomers and polymers that were not synthesized on the PAC particle surface. 2 shows TEM images of PAC and COP-PAC. TEM image analysis showed that the PAC particles had a smooth surface, while the shell-shaped COP was observed to be entangled like a chain on the surface of the COP-PAC particles. The shape of the COP grafted on the surface of the PAC particles was very similar to that of the COP used in previous studies to synthesize GAC particles. [Mines, PD et al., Chemical Engineering Journal, 309, 766-771. (2017). ].

The presence of COP was confirmed using energy dispersion spectroscopy (EDS) and elemental analysis (EA) techniques and the results are shown in Table 1. As a result, it was found that PAC is mainly composed of carbon, and the nitrogen content in COP-PAC is very high due to the presence of COP due to the growth of melamine. Particle analysis also confirmed that carbon appears to account for most of the PAC particle content, similar to the results of EDS analysis. Oxygen content of oxidized Ox-PAC in aqua regia increased significantly, but hydrogen and nitrogen contents increased slightly. In the case of Mel-PAC, the nitrogen content increased due to the grafted melamine, which could be due to the addition of the amine groups constituting melamine. The oxygen content was slightly reduced due to melamine replacing acyl chloride. Nitrogen content in COP-PAC was highest compared to other PAC types modified in the previous step, which was higher than that in Mel-PAC due to growth of terephthalaldehyde and melamine. The product of the COP synthesis step was analyzed by Fourier transform infrared spectroscopy (FT-IR) as shown in FIG. 3. For Ox-PAC, peaks corresponding to C═O and C—O were observed around 1631 cm −1 and 1064 cm −1, respectively, and adsorption peaks corresponding to C—O were slightly stronger than those due to C═O. Mel-PAC synthesized in step 3 was found to correlate with N-H and C-N around 1630 cm-1 and 1209 cm-1, respectively. For the final modified COP-PAC, multiple peaks were observed around 1548, 1479, 1354, 1193 and 877 cm-1. The peak pattern was similar to that found in pure COP-19, indicating that COP was effectively grafted to the surface of the PAC particles.

C N O H etc (a). TEM (EDS) (%) PAC 90.71 0.93 3.78 - 4.58 COP-PAC 63.61 10.08 14.13 - 12.18 (b). Elemental Analysis (%) PAC 80.14 0.27 3.06 0.58 15.92 Ox-PAC 45.60 1.12 16.32 4.59 30.98 Mel-PAC 76.64 2.48 8.95 0.78 12.49 COP-PAC 70.95 8.06 10.46 1.96 8.55

As shown in FIG. 1, Prussian blue was synthesized in the pores of COP grafted onto the surface of the COP-PAC particles. XRD analysis results of PAC, COP-PAC and COP-PAC are shown in FIG. 4. In general, peaks characteristic of PB are observed near 17.5 and 39.7 degrees. The XRD of COP-PAC-PB was analyzed and the peaks of PB were compared with the peak patterns of PAC and COP-PAC marked black and red, respectively. As a result, the peak of Prussian blue was found at a position similar to that of the previous study, from which it was confirmed that the Prussian blue was effectively synthesized in an in situ manner. FT-IR analysis was performed to confirm the presence of Prussian blue in the COP-PAC-PB particles, and a new adsorption peak due to (C≡N) stretching vibration of the cyanide group was observed around 2076 cm −1. This shows that Prussian blue is present in the COP-PAC-PB particles (FIG. 5).

Analysis of the BET surface area of PAC, COP-PAC and COP-PAC-PB using N2 adsorption-desorption isotherm is shown in FIG. The specific surface areas of PAC and COP-PAC were 776.82 m ² / g and 395 m ² / g, respectively. The specific surface area of the porous material is known to decrease significantly as it is oxidized during COP synthesis. This process increases the functional level for oxidation of the activated carbon particle surface and this result can be confirmed from the results of TEM (EDS) and elemental analysis (EA) shown in Table 1. The specific surface area of COP-PAC was higher than that of Ox-PAC. This is because the specific surface area of COP-PAC increased as COP was synthesized on the surface of PAC through grafting and growth of melamine. The results of the BET analysis of Table 2 indicate that the average pore size of COP-PAC and COP-PAC-PB is larger than the average pore size of PAC, because the walls of the micropores were destroyed in the oxidation process. The BET surface area of COP-PAC-PB was 290 m ² / g because PB was synthesized in situ in the pores of COP present on the surface of the PAC particles. Therefore, for this reason, it can be said that the specific surface area of COP-PAC-PB is smaller than the specific surface area of COP-PAC.

BET surface area
(m2 g-1) Average pore size
(nm) Total pore volume
(cm3 g-1) PAC 776.82 2.1172 0.4112 COP-PAC 395.68 2.3651 0.2687 COP-PAC-PB 289.61 2.3299 0.2349

PB Elution Analysis of COP-PAC-PB

Immediately after in situ synthesis of PB with PAC, Ox-PAC and COP-PAC, each adsorbent was washed six times for sampling. In order to analyze the desorption characteristics of the PB, the sample was subjected to UV-Vis instrumental analysis (FIG. 7). As shown in FIG. 7, the unmodified groups (PAC and Ox-PAC) were able to confirm that a large amount of PB was eluted during the first 1-2 washes, and that the thin concentration of PB was continuously desorbed. . On the other hand, in the case of the modified group (COP-PAC) it was confirmed that a small amount of PB desorbed in the first one wash. In addition, after six washes, no PB was desorbed from the COP-PAC, and it was confirmed that the PB was effectively bound and fixed in the pores of the synthesized COP on the surface of the PAC particles. Through this, when COP-PAC-PB is applied on-site, it can be confirmed that secondary environmental pollution by PB desorption can be prevented.

Evaluation of Cesium Adsorption Performance of COP-PAC-PB

Ox-PAC was synthesized to surface-modify PAC with COP, and the surface of PAC particles was modified with COP-PAC using Ox-PAC and COP. The COP-PAC particles were then in situ reacted with iron (III) chloride and potassium ferrocyanide solution to bind PB.

Items PAC-PB Ox-PAC-PB COP-PAC-PB Initial Cs (mg L ^-1 ) 9.91 9.91 9.91 Final Cs (mg L ^-1 ) 7.82 7.45 1.32 Removal rate (%) 20 24.8 86.7

As shown in Table 3, PAC-PB and Ox-PAC showed 20% and 25% removal efficiencies in 9.91 mg L-1 (initial concentration) cesium solution, respectively. Showed a removal efficiency of about 86%. These results indicate that COP was effectively synthesized on the surface of the PAC particles, and that PB was successfully in situ synthesized in the COP pores. The adsorption-desorption isotherm of the COP-PAC-PB particles is shown in FIG. 8. The maximum adsorption amount of COP-PAC-PB particles was 19 mg / g, and the equilibrium data were fitted to Langmuir and Freundlich isotherm models. The Langmuir isothermal adsorption model assumes that adsorption occurs at specific sites evenly by equal adsorption energy, and the equation is:

(1)

(One)

Where Ce (mg L ^-1 ) is the equilibrium concentration, qm (mg L ^-1 ) is the maximum adsorption capacity of the monolayer, b is the Langmuir constant. The adsorption capacity and Langmuir constant (b) of the monolayer (qm) are obtained from the intercept and slope, respectively. The Freundlich isotherm adsorption model assumes that the adsorbent surfaces have different adsorption energies. In the Freundlich isotherm adsorption model, K _f is an indicator of adsorption capacity and n is a constant of adsorption intensity.

(2)

(2)

The constants of the Langmuir and Freundlich models for COP-PAC-PB are shown in Table 4. The correlation coefficients (R ² ) of the Langmuir isotherms and the Freundlich isotherms are 0.9844 and 0.9635, respectively, which are larger in the Langmuir isotherms. Through this, it was confirmed that cesium is uniformly adsorbed into the monolayer in the pores.

Adsorption Constants of Langmuir Isothermal and Freundlich Isothermal Adsorption Models Langmuir isotherm Freundlich isotherm

(mg/g)

(mg / g)

(L / mg)

(mg ^{1-1 / n} L ^{1 / n} / g)

19 0.7704 0.9844 6.8212 0.5088 0.9635

Adsorption experiments were performed to determine the removal capacity of radioactive cesium Cs-137 of COP-PAC-PB and the results are shown in Table 5. COP-PAC-PB (0.2 g) was injected into a 200 ml solution containing 60 Bq / kg of Cs-137 and reacted for 24 hours. The Cs-137 concentration of the solution was then measured for 3,600 seconds using a 3x3-inch Nal detector (Nucare, RAD IQ FS200, Korea) capable of analyzing nuclides within a 20 mm thick lead storage container. The final Cs-137 concentration was 1.62 Bq / kg, which decreased by 97.3% at the initial concentration. In addition, the emission levels in the solution before and after performing the adsorption experiment are shown in the spectrum (Fig. 9). Levels before and after adsorption were indicated in red and black, respectively, and detectors were used under the same conditions. Before and after the adsorption experiment, the energy level of K-40 gamma ray, a natural radionuclide, showed a clear peak (1,460 KeV). The energy level (marked in red) of Cs-137 gamma rays before adsorption showed a clear peak (662 KeV), but the peak (662 KeV) was not clearly observed in the spectrum after adsorption due to the lower Cs-137 concentration. From this, it was found that Cs-137 was efficiently adsorbed and removed by the injected COP-PAC-PB.

Cs-137 Removability of COP-PAC-PB COP-PAC-PB (g L ^-1 ) Cs-137 activity (Bq / kg) Performance Initial Final R (%) DL 0.5 623.05 2.35 99.62 5.73

Claims (5)

A method of modifying the surface of powdered activated carbon with a polymer and forming Prussian blue on the surface of powdered activated carbon.
(a) oxidizing the powdered activated carbon to produce an activated carbon having a carboxyl group on the surface of the powdered activated carbon;
(b) reacting the activated carbon oxide with thionyl chloride to form an acyl chloride group on the surface of the activated carbon oxide;
(c) grafting the activated carbon with a polymer to prepare powdered activated carbon modified with a polymer;
(d) growing additional polymers on the surface of the powdered activated carbon particles modified with the polymers; And
(e) reacting the powdered activated carbon with iron (III) chloride and potassium ferrocyanide solution in situ.
The method of claim 2,
The adsorbent material is a method for producing an adsorbent material, characterized in that the outflow of Prussian blue in water is suppressed.
The method of claim 2,
The polymer is a method for producing an adsorbent material, characterized in that the melamine.
Method for removing cesium using the adsorption material prepared by the method of claim 2.

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