CN112919462A - Preparation method of nano activated carbon - Google Patents
Preparation method of nano activated carbon Download PDFInfo
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- CN112919462A CN112919462A CN202110161577.0A CN202110161577A CN112919462A CN 112919462 A CN112919462 A CN 112919462A CN 202110161577 A CN202110161577 A CN 202110161577A CN 112919462 A CN112919462 A CN 112919462A
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/318—Preparation characterised by the starting materials
- C01B32/324—Preparation characterised by the starting materials from waste materials, e.g. tyres or spent sulfite pulp liquor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/336—Preparation characterised by gaseous activating agents
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/342—Preparation characterised by non-gaseous activating agents
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/342—Preparation characterised by non-gaseous activating agents
- C01B32/348—Metallic compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
Abstract
The invention particularly relates to a preparation method of nano activated carbon, belonging to the technical field of preparation of activated carbon materials, and the method comprises the following steps: activating the corncob sponge layer to obtain a nano activated carbon semi-finished product; carrying out acid washing, water washing and drying on the nano activated carbon semi-finished product to obtain nano activated carbon particles; the preparation method adopts the corncob sponge flocculus as the raw material to prepare the nano activated carbon, the process is simple and easy to operate, and the prepared nano activated carbon has large specific surface area (500-3000 m)2Per g), average pore diameter of 1.0-3.0nm, pore volume (0.2-2.0) cm3Per g, excellent electrochemical performance (the specific mass capacity is 100-350F)And/g), the nano activated carbon can be used in a plurality of fields such as medical treatment, energy storage, catalysis and environmental protection.
Description
Technical Field
The invention belongs to the technical field of preparation of activated carbon materials, and particularly relates to a preparation method of nano activated carbon.
Background
As a new green energy storage element which is concerned, the performance of the super capacitor is directly determined by the quality of an electrode material. Activated carbon is the earliest electrode material used in a super capacitor and is the only electrode material for the super capacitor which is commercially applied at present. At present, the granularity of the activated carbon for the super capacitor on the market is 2-20 μm.
The nanometer Activated Carbon (ACNP) has the characteristics of small particle size, regular shape, smooth surface, large specific surface area, strong adsorption capacity, large adsorption area and the like. The nano-activation of the activated carbon reduces the size of the particles, which increases the surface area of the particles, makes the material fully contact with the electrolyte, and increases the utilization rate of the material.
The existing method for preparing nano activated carbon mainly comprises the steps of further refining activated carbon particles by a micron-sized activated carbon raw material in a ball milling mode, a rolling vibration mill mode or the like or preparing the activated carbon particles under the combined action of an activating agent and an auxiliary activating agent, for example, the method disclosed in the Chinese patent application CN104129786A uses an activated carbon carbonized material, KOH, NaOH and the auxiliary activating agent as raw materials and obtains the nano activated carbon particles by heating, cooling, filtering, drying and crushing, and the process is complicated.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide a method for preparing nano activated carbon that overcomes or at least partially solves the above problems.
The invention provides a preparation method of nano activated carbon, which comprises the following steps:
activating the corncob sponge layer to obtain a nano activated carbon semi-finished product;
carrying out acid washing, water washing and drying on the nano activated carbon semi-finished product to obtain nano activated carbon particles;
the method is characterized in that the corncob sponge layer is activated to obtain a nano activated carbon semi-finished product, and the method specifically comprises the following steps:
immersing the corncob sponge layer into an activating agent solution, and then placing the corncob sponge layer into an activating furnace for activation to obtain a nano activated carbon semi-finished product; or the like, or, alternatively,
and (3) placing the corncob sponge flocculus layer in an activation furnace filled with activated gas for activation to obtain a nano activated carbon semi-finished product.
Optionally, the activator in the activator solution comprises KOH and H3PO4And ZnCl2At least one of (1).
Optionally, the activator solution has a weight concentration of 0.1% to 50%.
Optionally, the activator solution has a weight concentration of 10% to 25%.
Optionally, the corncob sponge layer is immersed in an activator solution, and then is placed in an activation furnace for activation, so that a semi-finished product of the nano activated carbon is obtained, wherein the ratio of the corncob sponge layer to the activator solution is less than or equal to 6:1 in parts by weight.
Optionally, the soaking time of the corncob sponge layer in the activating agent is 5-48 h.
Optionally, the corncob sponge flocculus layer is placed in an activation furnace filled with activated gas for activation to obtain a semi-finished product of nano activated carbon, wherein the activated gas comprises CO2。
Optionally, the activation furnace is a resistance furnace, and the temperature of the resistance furnace is 600-1000 ℃.
Optionally, the activation oven is a microwave oven, and the power of the microwave oven is 500W-3000W.
Optionally, the activation time of the corncob sponge layer in the activation furnace is 5min-300 min.
One or more technical schemes in the invention at least have the following technical effects or advantages:
the preparation method of the nanometer activated carbon provided by the invention comprises the following steps: sponge-like corncobActivating the layer to obtain a semi-finished product of the nano activated carbon; carrying out acid washing, water washing and drying on the nano activated carbon semi-finished product to obtain nano activated carbon particles; the preparation method adopts the corncob sponge flocculus as the raw material to prepare the nano activated carbon, the process is simple and easy to operate, and the prepared nano activated carbon has large specific surface area (500-3000 m)2Per g), average pore diameter of 1.0-3.0nm, pore volume (0.2-2.0) cm3The electrochemical performance is excellent (the specific mass capacity is 100-350F/g), and the nano activated carbon can be used in a plurality of fields such as medical treatment, energy storage, catalysis and environmental protection.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a method of preparation provided by the present invention;
FIG. 2 is a block diagram of a method of preparation provided by the present invention;
FIG. 3 is an SEM photograph of nano-activated carbon provided by the present invention;
FIG. 4 is a TEM image at 50nm of the nano-activated carbon provided by the present invention;
FIG. 5 is a 20nm TEM image of nano-activated carbon provided by the present invention;
FIG. 6 is an isothermal adsorption and desorption curve of the nano activated carbon provided by the present invention;
FIG. 7 is a pore size distribution curve of nano-activated carbon provided by the present invention;
FIG. 8 is a cyclic voltammogram of the nano-activated carbon provided by the present invention at different scan rates.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the general idea is as follows:
according to an exemplary embodiment of the present invention, there is provided a method for preparing nano activated carbon, the method including:
s1, activating a corncob sponge wadding layer to obtain a nano activated carbon semi-finished product; the corncob sponge layer is taken out through a core taking machine or a core taking rotary head.
As an alternative embodiment, the activating the corncob sponge layer to obtain the semi-finished nano activated carbon product specifically comprises: the corncob sponge flocculus layer is subjected to standing, mechanical stirring, magnetic stirring or ultrasonic treatment when being soaked in the activating agent.
And immersing the corncob sponge layer into an activating agent solution, and then placing the corncob sponge layer into an activating furnace for activation to obtain a nano activated carbon semi-finished product.
Optionally, the activator in the activator solution comprises KOH and H3PO4And ZnCl2In particular, the activator solution has a concentration of 0.1% to 50% by weight, preferably 10% to 25% by weight.
When chemical activation is adopted, the weight concentration of the activating agent solution is controlled to be 0.1-50%, the equipment is seriously corroded when the weight concentration is excessively increased, and the activation efficiency of the corncob sponge floc layer is low when the weight concentration is excessively increased.
In this example, the ratio of the corncob sponge layers to the activator solution is 6:1 or less, preferably 0.5:1 to 3:1, in parts by weight.
In the embodiment, the soaking time of the corncob sponge layers in the activating agent is 5-48 h, preferably 10-24 h.
The soaking time of the corncob sponge flocculus layer in the activating agent is controlled to be 5-48 h, and if the value of the time is too small, the corncob sponge flocculus layer is not fully soaked, and if the value of the time is too large, the experiment period is too long, and necessary time waste is caused.
As an alternative embodiment, the corncob sponge layer is activated to obtain a nano activated carbon semi-finished product, which specifically comprises:
placing the corncob sponge flocculus layer in an activation furnace filled with activated gas for activation to obtain a nano activated carbon semi-finished product, wherein the activated gas comprises water vapor and CO2。
The activating gas comprises steam CO2The mechanism by which activation is achieved is C + H2O→CO+H2And C + CO2→2CO，H2O,CO2The flow rate of (B) is 10mL/min to 200mL/min, preferably 80mL/min to 150 mL/min. The low flow rate and the low activation efficiency lead to the overhigh pressure in the equipment.
In the embodiment, the activation furnace is a resistance furnace or a microwave oven, when the activation furnace is the resistance furnace, the activation temperature is 600-1000 ℃, and when the activation furnace is the microwave oven, the activation power is 500-3000W.
The reason why the resistivity activation temperature is controlled to be 600-1000 ℃ and the activation power of the microwave oven is controlled to be 500-3000W is that the optimal temperature for chemical activation is 600-850 ℃ (500-2000W), and the water vapor and CO are2The optimal temperature for activation is 900-1000 ℃ (2500-3000W), the adverse effect of too small value is poor activation effect, and the adverse effect of too large value is high requirement on equipment.
In the embodiment, the activation time of the corncob sponge layers in the activation furnace is 5min-300 min.
The reason for controlling the activation time of the corncob sponge layers in the activation furnace to be 5min-300min is that the optimal activation time of the microwave oven is 5min-60min, the optimal activation time of the resistance furnace is 60min-300min, the excessive adverse effect of the time is that the activation time is long, and the insufficient adverse effect is that the activation rate is low.
And S2, carrying out acid washing, water washing and drying on the nano activated carbon semi-finished product to obtain nano activated carbon particles.
The particle size of the nano activated carbon prepared by the method is 1-100nm, and finally the nano activated carbon can be screened according to the requirement.
The preparation method of nano activated carbon of the present application will be described in detail below with reference to examples, comparative examples and experimental data.
Example 1
Taking out the corncob sponge layer from the corncob by a coring machine, washing and drying, taking out 0.5g of the corncob sponge layer, putting the corncob sponge layer into a KOH (15g) solution with the concentration of 0.1%, weighing, putting the corncob sponge layer into a microwave activation furnace, and activating for 5min under the condition that the power is 500W. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Example 2
Taking out the corncob sponge layer from the corncob by adopting a coring and turning head, washing and drying the corncob sponge layer, taking out 0.5g of the corncob sponge layer, putting the corncob sponge layer into 5 percent KOH (1.5g) solution, weighing the solution, putting the weighed solution into a resistance furnace, and activating the solution for 10min at the temperature of 600 ℃. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Example 3
Taking out the corncob sponge layer from the corncob by a coring machine, washing and drying, taking out 0.5g of the corncob sponge layer, putting the corncob sponge layer into 10% KOH (1.5g) solution, weighing, putting the corncob sponge layer into microwave baking and activation, and activating for 10min under the condition that the power is 900W. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Example 4
Taking out the corncob sponge layer from the corncob by a coring machine, washing and drying the corncob sponge layer, taking out 0.5g of the corncob sponge layer, putting the corncob sponge layer into 10% ZnCl2(1.5g) solution, weighing the solution, putting the weighed solution into a microwave sintering furnace, and activating the solution for 15min under the condition that the power is 1500W. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Example 5
Taking out the corncob sponge layer from the corncob by a coring machine, washing and drying the corncob sponge layer, taking out 0.5g of the corncob sponge layer, putting the corncob sponge layer into 10% ZnCl2(1.5g) solution, weighing the solution, putting the weighed solution into a microwave sintering furnace, and activating the solution for 15min under the condition that the power is 1000W. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Example 6
Taking out the corncob sponge layer from the corncob by a coring machine, washing and drying, taking out 0.5g of the corncob sponge layer, putting the corncob sponge layer into a KOH (1.5g) solution with the concentration of 20%, weighing, putting the corncob sponge layer into a microwave sintering furnace, and activating for 5min under the condition that the power is 1500W. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Example 7
Taking out the corncob sponge layer from the corncob by a coring machine, washing and drying, taking out 0.5g, putting into a KOH (5g) solution with the concentration of 30%, weighing, putting into a microwave sintering furnace, and activating for 5min under the condition that the power is 800W. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Example 8
Taking out the corncob sponge layer from the corncob by a coring machine, washing and drying, taking out 0.5g of the corncob sponge layer, putting the corncob sponge layer into 50% KOH (5g) solution, weighing, putting the corncob sponge layer into a microwave sintering furnace, and activating for 15min under the condition that the power is 900W. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Example 9
Taking out the corncob sponge layer from the corncob by a coring machine, washing and drying, taking out 1g of the corncob sponge layer, putting the corncob sponge layer into a 50% H3PO4(12g) solution, weighing, putting the solution into a microwave sintering furnace, and activating for 15min under the condition of 1500W of power. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Example 10
Taking out the corncob sponge layer from the corncob by a coring machine, washing and drying, taking out 1g of the corncob sponge layer, putting the corncob sponge layer into a 10% H3PO4(5g) solution, weighing, putting the solution into a microwave sintering furnace, and activating for 30min under the condition that the power is 3000W. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Example 11
Taking out the corncob sponge flocculus from the corncobs by using a coring machine, washing and drying the corncob sponge flocculus, taking out 1g of the corncob sponge flocculus, putting the corncob sponge flocculus into water, weighing the corncob sponge flocculus, putting the corncob sponge flocculus into a microwave sintering furnace, and activating the corncob sponge flocculus for 30min under the condition that the power is 3000W. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Example 12
Taking out the corncob sponge flocculus from the corncob by adopting a coring machine, washing and drying the corncob sponge flocculus, taking out 1g of the corncob sponge flocculus, putting the corncob sponge flocculus into a crucible, weighing the corncob sponge flocculus, putting the corncob sponge flocculus into a microwave sintering furnace, and introducing CO under the condition that the power is 3000W2Activating for 30 min. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Example 13
Taking out the corncob sponge layer from the corncob by adopting a coring and turning head, washing and drying the corncob sponge layer, taking out 0.5g of the corncob sponge layer, putting the corncob sponge layer into 5 percent KOH (1.5g) solution, weighing the solution, putting the weighed solution into a resistance furnace, and activating the solution for 10min at the temperature of 1000 ℃. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Comparative example 1
Taking out the corncob sponge layer from the corncob by a coring machine, washing and drying, taking out 0.5g of the corncob sponge layer, putting the corncob sponge layer into a 60% KOH (1.5g) solution, weighing, putting the corncob sponge layer into microwave baking and activation, and activating for 10min under the condition that the power is 900W. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Comparative example 2
Taking out the corncob sponge layer from the corncob by a coring machine, washing and drying, taking out 0.5g of the corncob sponge layer, putting the corncob sponge layer into 10% KOH (0.07g) solution, weighing, putting the corncob sponge layer into microwave baking and activation, and activating for 10min under the condition that the power is 900W. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Comparative example 3
Taking out the corncob sponge flocculus from the corncob by adopting a coring machine, washing and drying, taking out 1g of the corncob sponge flocculus, putting the corncob sponge flocculus into a crucible, weighing, putting the crucible into a microwave sintering furnace, and introducing CO under the condition that the power is 3500W2Activating for 30 min. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Comparative example 4
Taking out the corncob sponge flocculus from the corncob by adopting a coring machine, washing and drying the corncob sponge flocculus, taking out 1g of the corncob sponge flocculus, putting the corncob sponge flocculus into a crucible, weighing the corncob sponge flocculus, putting the corncob sponge flocculus into a microwave sintering furnace, and introducing CO under the condition that the power is 300W2Activating for 30 min. And (4) pickling, washing, drying and screening the activated product to obtain the nano activated carbon particles.
Examples of the experiments
The nano activated carbon particles prepared in examples 1 to 3 and comparative examples 1 to 4 were examined and the results of the examination are shown in the following table.
From the data of examples 1-13, it can be seen that the specific surface area of the obtained nano activated carbon is large (500- & lt3000 m & gt)2Per g), average pore diameter of 1.0-3.0nm, pore volume (0.2-2.0) cm3The electrochemical performance is excellent (the specific mass capacity is 100-350F/g), and the comparison of the data of the comparative example 1 and the data of the example 3 can show that the concentration of the active agent is not in the range provided by the invention, so that the performance difference is not large, but the equipment is seriously corroded; by comparisonComparison of the data of example 2 and example 3 shows that the ratio of active agent to corncob sponge layer is outside the range provided by the present invention, resulting in low activation efficiency; as can be seen from comparison of the data of comparative examples 3 to 4 and example 12, the heating power outside the range provided by the present invention causes the activation temperature to be too high or too low, resulting in poor electrochemical properties of the product; likewise, activation temperatures outside the range provided by the present invention also cause the above problems.
Detailed description of the drawings 3-8:
as shown in fig. 3-5, fig. 3 is SEM photograph of nano activated carbon, fig. 4 is TEM photograph of nano activated carbon at 50nm, fig. 5 is TEM photograph of nano activated carbon at 20nm, from which it can be obtained that the particles of activated carbon have abundant pore structure in several nm to several tens nm, the pore size has micropores smaller than 2nm and also has mesopores larger than 2nm and smaller than 50 nm;
as shown in fig. 6, fig. 6 is an isothermal adsorption and desorption curve of nano activated carbon; as can be seen from the figure, the specific surface area of the nano activated carbon is mainly microporous, and a certain proportion of mesopores are also present.
As shown in fig. 7, fig. 7 is a pore size distribution curve of nano activated carbon; as can be seen from the figure, the pore diameter of the nano activated carbon is mostly below 2 nm.
FIG. 8 is a cyclic voltammogram of nano-activated carbon at different scan rates, wherein the cyclic voltammogram is 5mV/s,10mV/s,20mV/s,40mV/s, and 80mV/s in the direction of the arrows; as can be seen from the figure, the nano activated carbon has good electric double layer capacitance characteristics, and the mass specific capacity thereof was calculated.
One or more technical solutions in the present invention at least have the following technical effects or advantages:
(1) the preparation method provided by the invention is simple in process and easy to operate;
(2) the nano activated carbon prepared by the preparation method provided by the invention has large specific surface area (500-3000 m)2Per g), average pore diameter of 1.0-3.0nm, pore volume (0.2-2.0) cm3The electrochemical performance is excellent (the specific mass capacity is 100-350F/g);
(3) the nano activated carbon prepared by the preparation method can be used in a plurality of fields such as medical treatment, energy storage, catalysis and environmental protection;
finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for preparing nano activated carbon is characterized by comprising the following steps:
activating the corncob sponge layer to obtain a nano activated carbon semi-finished product;
carrying out acid washing, water washing and drying on the nano activated carbon semi-finished product to obtain nano activated carbon particles;
the method is characterized in that the corncob sponge layer is activated to obtain a nano activated carbon semi-finished product, and the method specifically comprises the following steps:
immersing the corncob sponge layer into an activating agent solution, and then placing the corncob sponge layer into an activating furnace for activation to obtain a nano activated carbon semi-finished product; or the like, or, alternatively,
and (3) placing the corncob sponge flocculus layer in an activation furnace filled with activated gas for activation to obtain a nano activated carbon semi-finished product.
2. The method for preparing nano activated carbon according to claim 1, wherein the activator in the activator solution comprises KOH and H3PO4And ZnCl2At least one of (1).
3. The method for preparing nano activated carbon according to claim 2, wherein the weight concentration of the activator solution is 0.1-50%.
4. The method for preparing nano activated carbon according to claim 3, wherein the weight concentration of the activator solution is 10-25%.
5. The method for preparing nano activated carbon according to claim 1, wherein the corncob sponge floc layer is immersed in an activating agent solution and then placed in an activating furnace for activation, so as to obtain a semi-finished nano activated carbon product, wherein the ratio of the corncob sponge floc layer to the activating agent solution is less than or equal to 6:1 in parts by weight.
6. The method for preparing nano activated carbon according to claim 1, wherein the soaking time of the corncob sponge layer in the activating agent is 5-48 h.
7. The method for preparing nano activated carbon according to claim 1, wherein the corncob sponge floc layer is placed in an activation furnace filled with an activation gas to be activated, so as to obtain a nano activated carbon semi-finished product, wherein the activation gas comprises H2O and CO2。
8. The method for preparing nano activated carbon according to claim 1, wherein the temperature of the activation furnace is 600 ℃ to 1000 ℃ of a resistance furnace.
9. The method for preparing nano activated carbon according to claim 1, wherein the activation oven is a microwave oven, and the power of the microwave oven is 500W-3000W.
10. The method for preparing nano activated carbon according to claim 1, wherein the activation time of the corncob sponge layer in the activation furnace is 5min to 300 min.
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| CN111186836A (en) * | 2018-11-14 | 2020-05-22 | 天津科技大学 | Preparation method of corncob-based activated carbon |
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| CN1736859A (en) * | 2005-08-15 | 2006-02-22 | 昆明理工大学 | Super active carbon preparation method |
| US20110292571A1 (en) * | 2010-05-27 | 2011-12-01 | Kishor Purushottam Gadkaree | Halogenated activated carbon materials for high energy density ultracapacitors |
| CN105384162A (en) * | 2015-12-04 | 2016-03-09 | 华南理工大学 | Corncob-based porous carbon material, and preparation method and application thereof |
| CN106423214A (en) * | 2016-08-22 | 2017-02-22 | 齐鲁工业大学 | Method for preparing carbon-based solid acid with high specific surface area and high acid content from corncob hydrolysis residues |
| CN111186836A (en) * | 2018-11-14 | 2020-05-22 | 天津科技大学 | Preparation method of corncob-based activated carbon |
| CN109467082A (en) * | 2018-12-18 | 2019-03-15 | 济南大学 | A kind of preparation method being graphitized the derivative carbon electrode material of porous corncob |
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