CN113117640A - Macroporous granular activated carbon prepared from powdered activated carbon and preparation method thereof - Google Patents

Macroporous granular activated carbon prepared from powdered activated carbon and preparation method thereof Download PDF

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CN113117640A
CN113117640A CN201911391373.5A CN201911391373A CN113117640A CN 113117640 A CN113117640 A CN 113117640A CN 201911391373 A CN201911391373 A CN 201911391373A CN 113117640 A CN113117640 A CN 113117640A
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陈剑雄
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    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28047—Gels
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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
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    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
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    • B01J20/28085—Pore diameter being more than 50 nm, i.e. macropores
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Abstract

The invention provides macroporous granular activated carbon prepared from powdered activated carbon, which is a compound formed by adding powdered activated carbon into hydrogel, wherein the compound comprises the following components in mass m1The powdered activated carbon has a mass of m2A high molecular compound, a crosslinking blocking agent and a pore-forming agent capable of forming the hydrogel, m1/m2And the cross-linking blocking agent is used for forming pore channels around the cross-linking blocking agent when the high molecular compound is subjected to cross-linking, the pore-foaming agent is solid powder, and the pore-foaming agent can be removed from the hydrogel through a physical and/or chemical method after the hydrogel is formed so as to form pores in the hydrogel. The application also provides a method for preparing macroporous particles by using the powdered activated carbonA method for preparing activated carbon. The macroporous granular activated carbon prepared by the method has the advantages of granular activated carbon, and also retains the advantages of powdered activated carbon.

Description

Macroporous granular activated carbon prepared from powdered activated carbon and preparation method thereof
Technical Field
The invention relates to the technical field of activated carbon, in particular to macroporous granular activated carbon prepared from powdered activated carbon and a preparation method thereof.
Background
Activated carbon is a very good adsorbent and is generally classified into powdered activated carbon and granular activated carbon according to the size of particle size. The powdered activated carbon has the advantages of large adsorption capacity and high adsorption speed in adsorption capacity, but has the defects of large dust, difficult separation and inconvenient regeneration; the granular activated carbon is just the opposite, has the advantages of no dust, column-mountable operation and convenient regeneration, but has the defects of small adsorption quantity and low adsorption speed. Therefore, it is desired to prepare powdered activated carbon into granular activated carbon, so that the product has both advantages and eliminates both disadvantages.
Yan Xinlong et al (Yan Xinlong et al, research progress on molded activated carbon preparation technology, chemical progress, 2008, vol 27, 12) reviewed the research progress on molded activated carbon preparation technology, and a method of preparing granular activated carbon from powdered activated carbon by adding a binder and then press molding, but adsorption performance and mechanical strength could not be both considered. The reason for this is that the powdered activated carbon is densified by high-pressure molding, and no large pore passage is formed around the powdered activated carbon as a passage for adsorbate. Such as: chinese patent CN201510868434.8 discloses a method for preparing granular activated carbon from inorganic binders sodium metaaluminate, sodium silicate and KOH, chinese patent CN201310754565.4 discloses a method for preparing granular activated carbon from organic binder acrylic acid emulsion, chinese patent CN201510767872.5 discloses a method for preparing granular activated carbon from organic binder coal tar, and chinese patent CN201610639682.x discloses a method for preparing granular activated carbon from organic binder humus.
Chinese patent CN201610085476.9 discloses a method for preparing core-shell granular activated carbon by using inorganic adhesive silica sol or cement, which can not form macropores because the inorganic adhesive can form a compact shell layer, and also reduces the adsorption capacity.
Chinese patent CN200510018861.3 discloses a method for preparing granular activated carbon by uniformly cross-linking chitosan, chinese patent CN201310437445.1 discloses a method for preparing granular activated carbon by uniformly cross-linking chitosan, and chinese patent CN201410666921.1 discloses a method for preparing granular activated carbon by uniformly cross-linking polyvinyl alcohol.
Therefore, it is necessary to provide a macroporous activated carbon prepared from powdered activated carbon and a method for preparing the same to solve the above problems.
Disclosure of Invention
The invention aims to provide macroporous granular activated carbon prepared from powdered activated carbon, and the prepared macroporous granular activated carbon has the advantages of granular activated carbon and also retains the advantages of powdered activated carbon. The adsorbate can rapidly pass through the hydrogel and reach the surface of the powdered activated carbon, thereby exerting the advantages of the powdered activated carbon, and simultaneously having the advantages of the granular activated carbon, namely the granular activated carbon, particularly the characteristics of simple recovery and simple regeneration.
In order to achieve the above object, the present invention provides a macroporous granular activated carbon prepared from powdered activated carbon, wherein the macroporous granular activated carbon is a composite formed by adding powdered activated carbon to hydrogel, and the composite comprises a mass m1The powdered activated carbon has a mass of m2A high molecular compound capable of forming the hydrogel (referred to as hydrogel high molecular compound for short), a pore-forming agent and a crosslinking blocking agent which does not participate in the crosslinking of the hydrogel high molecular compound,
wherein m is1/m2The cross-linking blocking agent is used for forming pore channels around the cross-linking blocking agent when the hydrogel high molecular compound is subjected to cross-linking, the pore-foaming agent is solid powder, and the pore-foaming agent can be removed from the hydrogel through a physical and/or chemical method after the hydrogel is formed so as to form pores in the hydrogel.
The applicant has conducted intensive studies on granular activated carbon formed by hydrogel and powdered activated carbon, and found that when hydrogel polymers containing powdered activated carbon are formed into hydrogel by uniform crosslinking, a uniform three-dimensional crosslinked network is formed around the powdered activated carbon, and large pores cannot be formed, thereby preventing rapid passage of adsorbate. Therefore, in order to exert the inherent advantages of the powdered activated carbon, it is necessary to form large pores or pores in the hydrogel around the powdered activated carbon. According to the application, the macroporous particle activated carbon prepared from the powdered activated carbon forms hydrogel in a non-uniform crosslinking mode, namely, a crosslinking blocking agent is added into the hydrogel, and the crosslinking blocking agent does not participate in crosslinking of hydrogel macromolecules and is used for forming pore channels around the crosslinking blocking agent when the hydrogel macromolecular compounds are crosslinked, so that a macroporous channel without crosslinking is formed around the crosslinking blocking agent. In addition, a porogen is introduced and may be physically or chemically removed from the hydrogel after the hydrogel is formed to form micron-sized large pores in the hydrogel. After the two measures are taken, large pore channels and large pores are formed in the three-dimensional network of the hydrogel, the adsorbate enters the large pore channels along the large pore channels, then is rapidly dispersed in the large pore channels without resistance, and then rapidly reaches the surface of the powdered activated carbon from the large pore channels around the large pore channels, so that the advantages of the powdered activated carbon are truly exerted, and the defects of the powdered activated carbon are avoided.
Accordingly, the present application also provides a method for preparing macroporous granular activated carbon from powdered activated carbon, comprising the steps of:
(1) with mass m2Dissolving the high molecular compound capable of forming the hydrogel in water, and uniformly stirring to obtain a solution A;
(2) dissolving or swelling the cross-linking blocking agent in water, and uniformly stirring to obtain a solution B;
(3) mixing the solution A and the solution B, and uniformly stirring to obtain a solution C;
(4) mixing pore-forming agent with mass m1The powdered activated carbon of (a) is mixed and stirred uniformly to obtain mixed powder D, wherein m is1/m2More than 1, the pore-foaming agent is solid powder;
(5) adding the mixed powder D into the solution C, and uniformly stirring to obtain a mixture E;
(6) crosslinking the mixture E, and then granulating to obtain a hydrogel compound F;
(7) removing the pore-forming agent in the hydrogel composite F to form pores, so as to obtain a hydrogel composite G without the pore-forming agent;
(8) swelling the hydrogel compound G in water to obtain macroporous granular activated carbon H for liquid phase adsorption; or swelling the hydrogel compound G in water, and then drying and dehydrating to obtain the macroporous granular activated carbon K for gas phase adsorption.
Accordingly, the present application also provides a method for preparing macroporous granular activated carbon from powdered activated carbon, comprising the steps of:
(1) with mass m2Dissolving the high molecular compound capable of forming the hydrogel in water, and uniformly stirring to obtain a solution A;
(2) dissolving or swelling the cross-linking blocking agent in water, and uniformly stirring to obtain a solution B;
(3) mixing the solution A and the solution B, and uniformly stirring to obtain a solution C;
(4) mixing pore-forming agent with mass m1The powdered activated carbon of (a) is mixed and stirred uniformly to obtain mixed powder D, wherein m is1/m2More than 1, the pore-foaming agent is solid powder;
(5) adding the mixed powder D into the solution C, uniformly stirring to obtain a mixture E, and then granulating the mixture E;
(6) crosslinking the mixture E granulated in the step (5) to obtain a hydrogel compound F;
(7) removing the pore-forming agent in the hydrogel composite F to form pores, so as to obtain a hydrogel composite G without the pore-forming agent;
(8) swelling the hydrogel compound G in water to obtain macroporous granular activated carbon H for liquid phase adsorption; or swelling the hydrogel compound G in water, and then drying and dehydrating to obtain the macroporous granular activated carbon K for gas phase adsorption.
Drawings
FIG. 1 is a schematic diagram of a hydrogel with only powdered activated carbon added.
FIG. 2 is a schematic structural diagram of hydrogel with powdered activated carbon and pore-forming agent added.
FIG. 3 is a schematic structural diagram of adding powdered activated carbon, pore-forming agent and cross-linking blocking agent into hydrogel.
Description of the symbols:
1-hydrogel polymer, 2-cross-linked structure, 3-powdered activated carbon, 4-pores formed by pore-forming agent, 5-cross-linked blocking agent, 6-pores and 7-pores
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings of the specification given herein, but are not to be construed as limiting the invention in any way.
Referring to fig. 1, in the prior art, when hydrogel polymers containing powdered activated carbon are formed into hydrogel by uniform crosslinking, a uniform three-dimensional crosslinked network is formed around the powdered activated carbon, and large pores cannot be formed, thereby preventing rapid passage of adsorbate. Referring to fig. 2, when a pore-forming agent is added, pores can be formed but pores cannot be formed, and a uniform three-dimensional cross-linked network is formed around the powdered activated carbon. Referring to fig. 3, the cross-linking blocking agent and the pore-forming agent are added to the macroporous granular activated carbon of the present invention, so that non-cross-linked pores and pores are formed in the hydrogel, and the three-dimensional cross-linked network is broken, such that the adsorbate can rapidly pass through the hydrogel and reach the surface of the powdered activated carbon, thereby exerting the advantages of the powdered activated carbon.
The macroporous granular activated carbon prepared by the powdery activated carbon is a compound formed by adding the powdery activated carbon into hydrogel, and the compound comprises the following components by mass m1The powdered activated carbon has a mass of m2The polymer compound, the crosslinking blocking agent and the pore-forming agent which can form the hydrogel, wherein m is1/m2Is greater than 1. Hydrogel polymer refers to a substance that can be used to form a hydrogel, for example, the hydrogel polymer can be, but is not limited toSodium alginate, polyvinyl alcohol, chitosan, cellulose derivatives, and the like.
The crosslinking blocking agent does not participate in crosslinking of the hydrogel high polymer and is used for forming pore channels around the crosslinking blocking agent when the hydrogel high polymer compound is crosslinked. Specifically, the cross-linking blocking agent is a water-soluble polymer or a water-swellable polymer, and does not participate in cross-linking of the hydrogel polymer compound, so that a pore channel without cross-linking is formed around the cross-linking blocking agent. For example, the water-soluble polymer of the blocking agent can be, but is not limited to, polyvinyl alcohol, and the water-swellable polymer can be, but is not limited to, wheat starch. It should be noted that, in the same macroporous granular activated carbon, the hydrogel polymer compound and the water-soluble polymer of the blocking agent cannot adopt the same substance at the same time.
Wherein the porogen is a solid powder and is physically and/or chemically removable from the hydrogel after the hydrogel is formed so as to form pores in the hydrogel. For example, the porogen may be, but is not limited to, precipitated calcium carbonate.
Therefore, the macroporous granular activated carbon obtained by the invention forms non-crosslinked pore channels and pores in hydrogel due to the addition of the crosslinking blocking agent and the pore-forming agent, so that adsorbates can quickly pass through the hydrogel to reach the surface of the powdery activated carbon, thereby exerting the advantages of the powdery activated carbon, and simultaneously having the granular form, namely the advantages of the granular activated carbon, particularly the characteristics of simple recovery and simple regeneration, and playing an important role in the industries of decolorization and environmental protection.
The application discloses a method for preparing macroporous granular activated carbon by using powdered activated carbon, which comprises the following steps:
(1) with mass m2Dissolving the high molecular compound capable of forming the hydrogel in water, and uniformly stirring to obtain a solution A;
(2) dissolving or swelling the cross-linking blocking agent in water, and uniformly stirring to obtain a solution B;
(3) mixing the solution A and the solution B, and uniformly stirring to obtain a solution C;
(4) mixing pore-forming agent with mass m1The powdered activated carbon of (a) is mixed and stirred uniformly to obtain mixed powder D, wherein m is1/m2More than 1, the pore-foaming agent is solid powder;
(5) adding the mixed powder D into the solution C, and uniformly stirring to obtain a mixture E;
(6) crosslinking the mixture E, and then granulating to obtain a hydrogel compound F;
(7) removing the pore-forming agent in the hydrogel composite F to form pores, so as to obtain a hydrogel composite G without the pore-forming agent;
(8) swelling the hydrogel compound G in water to obtain macroporous granular activated carbon H for liquid phase adsorption; or swelling the hydrogel compound G in water, and then drying and dehydrating to obtain the macroporous granular activated carbon K for gas phase adsorption.
Wherein in the step (1), the mass is m2After the high molecular compound capable of forming the hydrogel is dissolved in water, a cross-linking agent for chemical cross-linking can be added according to the requirement of chemical cross-linking, and the solution A is obtained after uniform stirring.
In the steps (5) and (6), the mixture E can adopt physical crosslinking and/or chemical crosslinking, and granulation can be carried out before crosslinking, namely granulation before crosslinking; the granulation may be performed after the crosslinking, and is referred to as post-crosslinking granulation. For example, in pre-crosslinking pelletization:
step (5) adding the mixed powder D into the solution C, uniformly stirring to obtain a mixture E, and then granulating the mixture E;
step (6) crosslinking the mixture E granulated in the step (5) to obtain a hydrogel compound F;
in granulation after crosslinking:
step (5), adding the mixed powder D into the solution C, and uniformly stirring to obtain a mixture E;
step (6), crosslinking the mixture E, and then granulating to obtain a hydrogel compound F;
in the step (7), the porogen may be removed by a physical method, a chemical method, or both a physical method and a chemical method.
Wherein, in the step (8), macroporous granular activated carbon H for liquid phase adsorption can be prepared, and macroporous granular activated carbon K for gas phase adsorption can also be prepared by drying and dehydration. For example, after the hydrogel compound G is swelled in water, drying and dehydration are carried out to obtain the macroporous granular activated carbon K for gas phase adsorption. Preferably, the method for drying and dehydrating adopts a freeze drying method.
The method of making macroporous granular activated carbon from powdered activated carbon of the present application is further illustrated by the following specific examples, but the present invention is not intended to be limited to the examples shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Example 1
The method for preparing macroporous granular activated carbon by using powdered activated carbon comprises the following steps:
(1) the mass is m2Adding 0.60 g of sodium alginate into 15.00 g of water, and uniformly stirring to obtain a solution A;
(2) adding 1.20 g of polyvinyl alcohol serving as a macromolecular crosslinking blocking agent into 15.00 g of water, dissolving in a water bath at 90 ℃, and uniformly stirring to obtain a solution B;
(3) mixing the solution A and the solution B, and uniformly stirring to obtain a solution C;
(4) 1250-mesh powder pore-forming agent light calcium carbonate of 1.34 g and mass m110.50 g of powdered activated carbon and stirring them uniformly to obtain a mixed powder D, wherein m is1/m2＝21＞1；
(5) Adding the mixed powder D into the solution C, uniformly stirring to obtain a mixture E, adding the mixture E into 200 g of ethyl acetate, and stirring to form particles, namely granulating before crosslinking;
(6) adding 12% CaCl into the solution obtained in the step (5)2Crosslinking sodium alginate with 20 g of the solution to form a hydrogel compound F;
(7) adding 1.2G of acetic acid into the solution obtained in the step (6) to dissolve and remove the pore-forming agent calcium carbonate in the hydrogel composite F, carrying out solid-liquid separation and washing with water to obtain a hydrogel composite G without the pore-forming agent;
(8) swelling the obtained hydrogel compound G in water to obtain macroporous granular activated carbon H for liquid phase adsorption;
(9) and swelling the obtained hydrogel compound G in water, and then carrying out freeze drying to obtain the macroporous granular activated carbon K for gas phase adsorption.
Example 2
The method for preparing macroporous granular activated carbon by using powdered activated carbon comprises the following steps:
(1) the mass is m2Adding 2.10 g of high molecular compound polyvinyl alcohol into 15.00 g of water, dissolving in a water bath at 90 ℃, and uniformly stirring to obtain a solution A;
(2) adding water into 1.20 parts of wheat starch serving as a macromolecular cross-linking blocking agent to 15.00 g, dissolving in a water bath at 90 ℃, and uniformly stirring to obtain a solution B;
(3) mixing the solution A and the solution B, and uniformly stirring to obtain a solution C;
(4) the 1250-mesh powder pore-foaming agent light calcium carbonate is 10.80 g and has the mass of m1Powdered activated carbon 5.40 grams was mixed and stirred well to give a mixed powder D, where m is1/m2＝2.57＞1；
(5) Adding the mixed powder D into the solution C, uniformly stirring, pouring into a 100ml beaker, and compacting to obtain a mixture E;
(6) freezing the mixture E at-20 ℃ for a certain time for crosslinking, taking out the mixture E, thawing the mixture at room temperature, cutting the mixture E into particles with the size of 1.2 multiplied by 1.2mm, and granulating the particles after crosslinking to obtain a hydrogel compound F;
(7) pouring 200G of 4% HCl solution into the hydrogel compound F, dissolving and removing the pore-forming agent calcium carbonate, performing solid-liquid separation, and washing with water to obtain a hydrogel compound G without the pore-forming agent;
(8) swelling the obtained hydrogel compound G in water to obtain macroporous granular activated carbon H for liquid phase adsorption;
(9) and swelling the obtained hydrogel compound G in water, and then carrying out freeze drying to obtain the macroporous granular activated carbon K for gas phase adsorption.
Comparative example 1
Comparative example 1 is the same as example 2 in the preparation of granular activated carbon, except that: comparative example 1 lacks a crosslink breaker and porogen. The method for preparing granular activated carbon from powdered activated carbon of the present comparative example comprises the steps of:
(1) the mass is m2Adding 2.10 g of high molecular compound polyvinyl alcohol into 30.00 g of water, dissolving in a water bath at 90 ℃, and uniformly stirring to obtain a solution A;
(2) the mass is m1Adding 5.40 g of powdered activated carbon into the solution A, uniformly stirring, pouring into a 100ml beaker, and compacting to obtain a mixture E1;
(3) freezing the mixture E1 at-20 deg.C for a certain time for crosslinking, thawing at room temperature, cutting into 1.2 × 1.2 × 1.2mm granules, and granulating to obtain hydrogel compound F1;
(4) swelling the obtained hydrogel compound F1 in water to obtain granular activated carbon H1 for liquid phase adsorption;
(5) after the obtained hydrogel composite F1 was swelled in water and then freeze-dried, granular activated carbon K1 for gas phase adsorption was obtained.
Comparative example 2
Comparative example 2 the same procedure as in example 2 was used to produce granular activated carbon, except that: comparative example 2 lacks a cross-linking blocker. The method for preparing granular activated carbon from powdered activated carbon of the present comparative example comprises the steps of:
(1) the mass is m2Adding 2.10 g of high molecular compound polyvinyl alcohol into 30.00 g of water, dissolving in a water bath at 90 ℃, and uniformly stirring to obtain a solution A;
(2) the 1250-mesh powder pore-foaming agent light calcium carbonate is 10.80 g and has the mass of m1Powdered activated carbon 5.40 grams was mixed and stirred well to give a mixed powder D, where m is1/m2＝2.57＞1；
(3) Adding the mixed powder D into the solution A, uniformly stirring, pouring into a 100ml beaker, and compacting to obtain a mixture E2;
(4) freezing the mixture E2 at-20 deg.C for a certain time for crosslinking, thawing at room temperature, cutting into 1.2 × 1.2 × 1.2mm granules, and granulating to obtain hydrogel compound F2;
(5) pouring 200G of 4% HCl solution into the hydrogel compound F2, dissolving and removing the pore-forming agent calcium carbonate, carrying out solid-liquid separation and washing with water to obtain a hydrogel compound G2 without the pore-forming agent;
(6) swelling the obtained hydrogel compound G2 in water to obtain granular activated carbon H2 for liquid phase adsorption;
(7) after the obtained hydrogel composite G2 was swelled in water and then freeze-dried, granular activated carbon K2 for gas phase adsorption was obtained.
The samples of example 2, comparative example 1 and comparative example 2 were loaded on the same chromatographic column to the same height, a series of sugar solutions with different transmittances were passed through the column at the same flow rate, the effluent was collected and the transmittance was measured, and then the decolorization ratio per unit mass of powdered activated carbon was calculated and compared with that of liquid-phase-adsorbed macroporous activated carbon H, and the data are shown in table 1.
TABLE 1 discoloration test results
Figure BDA0002345058370000101
As can be seen from table 1, the decoloring rate of the macroporous activated carbon H adsorbed by the liquid phase of the present invention is 2.50 times that of H1 and 1.84 times that of H2, and the decoloring performance of the macroporous activated carbon H is greatly improved. The reason is that the crosslinking blocking agent and the pore-forming agent are added into the macroporous granular activated carbon, so that non-crosslinked pore canals and pores are formed in the hydrogel, and the adsorbate can quickly pass through the hydrogel to reach the surface of the powdered activated carbon, thereby exerting the advantages of the powdered activated carbon.
The present invention has been described in connection with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, and is intended to cover various modifications, equivalent combinations, which are made in accordance with the spirit of the present invention.

Claims (10)

1. The macroporous granular activated carbon is characterized in that the macroporous granular activated carbon is a compound formed by adding powdered activated carbon into hydrogel, and the compound comprises the components with the mass of m1The powdered activated carbon has a mass of m2A polymer compound capable of forming the hydrogel, a porogen and a cross-linking blocking agent which does not participate in cross-linking of the polymer compound forming the hydrogel,
wherein m is1/m2The cross-linking blocking agent is used for forming pore channels around the cross-linking blocking agent when the hydrogel high molecular compound is subjected to cross-linking, the pore-foaming agent is solid powder, and the pore-foaming agent can be removed from the hydrogel through a physical and/or chemical method after the hydrogel is formed so as to form pores in the hydrogel.
2. The macroporous granular activated carbon as claimed in claim 1, wherein the cross-linking blocking agent is a water-soluble polymer or a water-swellable polymer.
3. A method for preparing macroporous granular activated carbon by using powdered activated carbon is characterized by comprising the following steps:
(1) with mass m2Dissolving the high molecular compound capable of forming the hydrogel in water, and uniformly stirring to obtain a solution A;
(2) dissolving or swelling the cross-linking blocking agent in water, and uniformly stirring to obtain a solution B;
(3) mixing the solution A and the solution B, and uniformly stirring to obtain a solution C;
(4) mixing pore-forming agent with mass m1The powdered activated carbon of (a) is mixed and stirred uniformly to obtain mixed powder D, wherein m is1/m2More than 1, the pore-foaming agent is solid powder;
(5) adding the mixed powder D into the solution C, and uniformly stirring to obtain a mixture E;
(6) crosslinking the mixture E, and then granulating to obtain a hydrogel compound F;
(7) removing the pore-forming agent in the hydrogel composite F to form pores, so as to obtain a hydrogel composite G without the pore-forming agent;
(8) swelling the hydrogel compound G in water to obtain macroporous granular activated carbon H for liquid phase adsorption; or swelling the hydrogel compound G in water, and then drying and dehydrating to obtain the macroporous granular activated carbon K for gas phase adsorption.
4. The method for preparing macroporous granular activated carbon from powdered activated carbon as claimed in claim 3, wherein the method of drying and dehydrating employs a freeze-drying method.
5. The method for preparing macroporous granular activated carbon using powdered activated carbon as claimed in claim 3, wherein in the step (1), the mass m is2After the high molecular compound capable of forming the hydrogel is dissolved in water, a cross-linking agent for chemical cross-linking is added, and the solution A is obtained after even stirring.
6. The method for preparing macroporous granular activated carbon using powdered activated carbon as claimed in claim 3, wherein the cross-linking blocking agent is a water-soluble polymer or a water-swellable polymer.
7. A method for preparing macroporous granular activated carbon by using powdered activated carbon is characterized by comprising the following steps:
(1) with mass m2Dissolving the high molecular compound capable of forming the hydrogel in water, and uniformly stirring to obtain a solution A;
(2) dissolving or swelling the cross-linking blocking agent in water, and uniformly stirring to obtain a solution B;
(3) mixing the solution A and the solution B, and uniformly stirring to obtain a solution C;
(4) mixing pore-forming agent with mass m1The powdered activated carbon of (a) is mixed and stirred uniformly to obtain mixed powder D, wherein m is1/m2More than 1, the pore-foaming agent is solid powder;
(5) adding the mixed powder D into the solution C, uniformly stirring to obtain a mixture E, and then granulating the mixture E;
(6) crosslinking the mixture E granulated in the step (5) to obtain a hydrogel compound F;
(7) removing the pore-forming agent in the hydrogel composite F to form pores, so as to obtain a hydrogel composite G without the pore-forming agent;
(8) swelling the hydrogel compound G in water to obtain macroporous granular activated carbon H for liquid phase adsorption; or swelling the hydrogel compound G in water, and then drying and dehydrating to obtain the macroporous granular activated carbon K for gas phase adsorption.
8. The method for preparing macroporous granular activated carbon from powdered activated carbon as claimed in claim 7, wherein the method of drying and dehydrating employs a freeze-drying method.
9. The method for preparing macroporous granular activated carbon using powdered activated carbon as claimed in claim 7, wherein the cross-linking blocking agent is a water-soluble polymer or a water-swellable polymer.
10. The method for preparing macroporous granular activated carbon using powdered activated carbon as claimed in claim 7, wherein in the step (1), the mass m is2After the high molecular compound capable of forming the hydrogel is dissolved in water, a cross-linking agent for chemical cross-linking is added, and the solution A is obtained after even stirring.
CN201911391373.5A 2019-12-30 2019-12-30 Macroporous granular activated carbon prepared from powdered activated carbon and preparation method thereof Pending CN113117640A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115337912A (en) * 2022-08-03 2022-11-15 河池学院 Magnetic cross-linked chitosan-polyethyleneimine/biochar composite gel particles and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115337912A (en) * 2022-08-03 2022-11-15 河池学院 Magnetic cross-linked chitosan-polyethyleneimine/biochar composite gel particles and preparation method thereof

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