CN111821944A - Active carbon modification method for removing ammonia gas in air - Google Patents
Active carbon modification method for removing ammonia gas in air Download PDFInfo
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- CN111821944A CN111821944A CN202010647354.0A CN202010647354A CN111821944A CN 111821944 A CN111821944 A CN 111821944A CN 202010647354 A CN202010647354 A CN 202010647354A CN 111821944 A CN111821944 A CN 111821944A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/406—Ammonia
Abstract
The invention discloses an active carbon modification method for removing ammonia gas in air, which comprises the following steps: (1) pretreating active carbon; cleaning the activated carbon by using hydrochloric acid, and opening an activated carbon pore channel; (2) performing active carbon modification treatment; performing active carbon modification by adopting a nitric acid impregnation oxidation method and an oxalic acid, phosphoric acid and succinic acid non-volatile acid loading impregnation method, wherein a shaking table is used for oscillation treatment in the impregnation process; (3) drying the activated carbon; filtering the modified solution, and drying the activated carbon. The method replaces the traditional active carbon modification method of the traditional metal salt impregnation, and avoids the problems that the pores of the active carbon are blocked by the salting-out of the metal salt and the impregnated matter is easy to fall off to pollute the field environment; the method for modifying the active carbon to form the oxygen-containing functional group by high-concentration strong oxidation is replaced, so that the influence of the absorption of the active carbon on other substances caused by the fact that the water absorption is strengthened is avoided, and the effect of removing the ammonia gas is further influenced; the activated carbon is used as a carrier, and ammonia gas is removed by using the nonvolatile acid, so that the adsorption capacity of the activated carbon on the ammonia gas is improved.
Description
Technical Field
The invention relates to the technical field of modified activated carbon, in particular to an activated carbon modification method for removing ammonia gas in air.
Background
Air pollution is increasingly serious, a large amount of nitrides exist in air, ammonia gas is a main pollutant in the nitride pollution due to the fact that the ammonia gas is smelly and can burn eyes, skin and respiratory tract mucosa of people, and the problem that people must think about how to remove the ammonia gas in the air is solved.
Activated carbon is an artificial material with a three-dimensional structure and a large specific surface area. The activated carbon contains a large number of micropores, has a large specific surface area, can effectively remove chromaticity and odor, and can remove most organic pollutants and certain inorganic matters in secondary sewage, including certain toxic heavy metals. The modification of the activated carbon is to make the surface of the activated carbon undergo some chemical reactions by some chemical or physical methods to reach an active core point for adsorbing a specific substance.
According to the adsorption concentration (high efficiency and large adsorption capacity) and the thermal steam desorption regeneration principle of the activated carbon, the adsorption performance of the activated carbon and the catalytic decomposition effect (chemical stability) after modification have strong removal capacity on certain organic harmful gases, when waste gas passes through an activated carbon layer, the waste gas is adsorbed on the activated carbon by unbalanced molecular attraction or chemical bond force existing on the surface of the carbon, and the chemical catalysis and decomposition effects are simultaneously carried out, so that the aim of purifying the harmful gases is fulfilled. The modified active carbon can selectively adsorb harmful gases such as NOx, SOx, formaldehyde and the like in air treatment; the production process of the modified activated carbon is mature, and the effect is reliable, so the modified activated carbon is widely applied to organic waste gas treatment in the industries of environmental protection, chemical industry, paint spraying, printing, light industry and the like.
In the prior art, physical adsorption is often adopted when ammonia gas is treated, but the adsorption capacity of the coconut shell activated carbon activated by water vapor or potassium hydroxide to the ammonia gas is low and almost has no adsorption capacity; furthermore, the modification method of the activated carbon mostly adopts a metal salt impregnation method for modification, however, the metal salt is precipitated on the surface of the activated carbon, which causes the following problems:
1. the precipitated metal salt blocks pores of the activated carbon, so that the adsorption capacity of the activated carbon on gaseous small molecules is influenced, and the removal effect of ammonia is further influenced;
2. the modified active carbon impregnated by the metal salt is easy to fall off, pollutes the field environment and needs to additionally treat the fallen impregnated matter;
in addition to the modification by the method of impregnating activated carbon with metal salt, the conventional technique can also perform the modification of activated carbon by simply using a strong oxidant to oxidize the activated carbon so as to generate oxygen-containing functional groups on the surface of the activated carbon, however, the method has the following problems:
3. the oxygen-containing functional groups on the surface of the activated carbon can improve the water absorption capacity of the activated carbon, and the strong water absorption performance can influence the adsorption of the activated carbon on other substances, thereby influencing the ammonia removal effect;
in summary, the ammonia removal effect of the modified activated carbon impregnated with the metal salt and the strongly oxidized modified activated carbon is not good, and a new activated carbon modification method needs to be developed to improve the ammonia removal effect.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an active carbon modification method for removing ammonia gas in air.
In order to achieve the purpose, the invention adopts the following technical scheme:
an active carbon modification method for removing ammonia gas in air comprises the following specific steps:
step S1: pretreating active carbon; cleaning the activated carbon by using hydrochloric acid, and opening an activated carbon pore channel;
step S2: performing active carbon modification treatment; firstly, oxidizing functional groups on the surface of activated carbon by using low-concentration nitric acid, and then soaking the activated carbon by using a normal-temperature non-volatile acid aqueous solution such as oxalic acid, phosphoric acid or succinic acid as a modification solution, and performing oscillation treatment on the modified solution soaked activated carbon;
step S3: drying the activated carbon; filtering the modified solution, and drying the activated carbon.
Further, step S1 includes a step of dredging pores of the activated carbon, first, immersing the activated carbon in water, shaking the activated carbon and the immersion water, and dredging the pores; then, the activated carbon is washed by hydrochloric acid, and the pore channels of the activated carbon are opened.
In step S2, the shaking process is performed by using a shaking table. Shaking the shaking table and shaking the processing can make nitric acid and active carbon surface functional group fully react, also make oxalic acid or phosphoric acid or succinic acid etc. the difficult volatile acid of normal atmospheric temperature fully load to among each hole of active carbon, improve the acid load capacity of active carbon to promote the adsorption efficiency of active carbon to ammonia.
Step S3 further includes a step of removing large water droplets on the surface; firstly, removing large-particle water drops on the surface; then, the modified liquid is filtered again, the activated carbon is dried by adopting a rotary furnace, so that the modified activated carbon is heated uniformly, and the adhesion of the activated carbon caused by the impregnation of oxalic acid, phosphoric acid or succinic acid is prevented.
Further, step S2 includes the step of removing the adsorbed contaminant gas inside the activated carbon; firstly, putting activated carbon in a closed environment for vacuumizing treatment by a vacuum impregnation method to remove part of polluted gas adsorbed in the activated carbon; then, injecting a normal-temperature nonvolatile acid dipping mixed solution of nitric acid and oxalic acid, or nitric acid and phosphoric acid, or nitric acid and succinic acid into a closed container to be fully mixed with the activated carbon, using a normal-temperature nonvolatile acid mixed aqueous solution of nitric acid and oxalic acid, or nitric acid and phosphoric acid, or nitric acid and succinic acid as a modification solution to dip the activated carbon, and carrying out oscillation treatment on the modification solution dipped activated carbon to further improve the normal-temperature nonvolatile acid loading capacity of the activated carbon, such as oxalic acid, phosphoric acid or succinic acid.
Further, step S1 is a step of opening pores of the activated carbon; using excessive pure water to dip the activated carbon, and further dredging pores by adopting ultrasonic oscillation after excessive pure water dipping;
further, step S3 is a step of removing the adsorbed pollutant gas inside the activated carbon, and removing large water droplets on the surface by centrifugation.
Further, the method also comprises a step of S4 temperature reduction, wherein high-purity nitrogen is adopted to sweep the activated carbon or naturally reduce the temperature under the nitrogen protection condition, so that the activated carbon is prevented from adsorbing ammonia in the air, and the adsorption effect of a customer site is prevented from being influenced.
Further, the method also comprises a step of S5 packaging, and the cooled activated carbon is hermetically packaged.
Further, in step S1, after the activated carbon is washed with hydrochloric acid, it is washed with water to make the activated carbon neutral. And redundant hydrochloric acid on the surface of the activated carbon is washed away, so that the reaction of the modified solution and the hydrochloric acid is avoided, and more modified solution is consumed in the dipping process.
The hydrochloric acid solution in the step S1 has a concentration of 2% to 10%, preferably, the hydrochloric acid solution has a concentration of 5%, and the activated carbon is washed with an excessive amount of the hydrochloric acid solution, so that more pore structures are formed on the surface of the activated carbon, and the specific surface area is increased.
The concentration of the nitric acid in the step S2 is lower than 5%, the concentration of the oxalic acid or phosphoric acid or succinic acid aqueous solution is 10% -30%, and preferably, the concentration of the phosphoric acid aqueous solution is 20%.
In the step S2, the impregnation ratio of the modification solution to the activated carbon is 1: 1 to 5: 1. Preferably, the impregnation ratio of the modifying solution to the activated carbon is 3: 1, ensuring the uniformity and the sufficiency of impregnation, thereby ensuring the modification effect of the activated carbon.
Further, in step S2, the oscillating frequency of the shaking table is controlled at 150r/min + -5, and the oscillating treatment is maintained for 0.5-1.5 hours; ensures that the phosphoric acid is fully adsorbed on the surface of the active carbon and is fully impregnated.
And the drying temperature of the step S3 is controlled to be 150-200 ℃. The boiling point of the oxalic acid, the phosphoric acid or the succinic acid is not exceeded, and the oxalic acid, the phosphoric acid or the succinic acid is prevented from volatilizing in the drying process.
Further, the activated carbon is coconut shell activated carbon activated by water vapor or potassium hydroxide; the air purification active carbon adopts coconut shell active carbon with CTC value of 80-100 and iodine value of more than 1200, preferably, the air purification active carbon adopts coconut shell active carbon with CTC value of about 90 and iodine value of more than 1200, and has larger specific surface area and better mechanical strength than common coal-made carbon. The coconut shell activated carbon belongs to the category of shell activated carbon, and is mainly characterized by small density, light hand feeling, large specific surface area, sufficient pore structure and convenient adsorption and modification reaction.
Compared with the prior art, the invention has the beneficial effects that:
1. active carbon modification is carried out by adopting a mode of soaking in an aqueous solution of a non-volatile acid, the active carbon is taken as a carrier, and the non-volatile acid such as oxalic acid, phosphoric acid or succinic acid is used for removing ammonia gas, so that the adsorption capacity of the active carbon on the ammonia gas is greatly improved;
2. the low-concentration nitric acid can improve the content of oxygen-containing functional groups on the surface of the activated carbon, improve the ammonia removal capability of the activated carbon and simultaneously can not damage the pore structure of the activated carbon.
3. The traditional active carbon modification method of the traditional metal salt impregnation is replaced, and the problems that the pores of the active carbon are blocked by the precipitation of the metal salt and the impregnated matter is easy to fall off to pollute the field environment are avoided;
4. the method replaces the modification method of the active carbon with oxygen-containing functional groups formed by strong oxidation, and avoids the influence of the strong water absorption on the adsorption of the active carbon on other substances, thereby influencing the removal effect of ammonia gas.
Drawings
FIG. 1 is a schematic flow chart of steps in example 1 of the present invention.
FIG. 2 is a flowchart illustrating steps of embodiment 2 of the present invention.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Example 1: as shown in fig. 1, a method for modifying activated carbon to remove ammonia gas from air includes the following steps:
step S1: pretreating active carbon; cleaning the activated carbon by using hydrochloric acid, and opening an activated carbon pore channel;
step S2: performing active carbon modification treatment; soaking active carbon by using nitric acid and oxalic acid or phosphoric acid or succinic acid aqueous solution as a modification solution, and performing oscillation treatment by using a shaking table;
step S3: drying the activated carbon; filtering the modified solution, and drying the activated carbon.
Specifically, the concentration of the hydrochloric acid solution is 5%, and the excessive hydrochloric acid solution is used for cleaning the activated carbon, so that more pore structures can be formed on the surface of the activated carbon, and the specific surface area is increased.
Specifically, after the activated carbon is washed, the activated carbon needs to be washed with water to be neutral, redundant hydrochloric acid on the surface of the activated carbon is washed away, the reaction of the modified solution and the hydrochloric acid is avoided, and more modified solution is consumed in the dipping process.
Specifically, the concentration of the nitric acid is 5%, and the concentration of the oxalic acid or phosphoric acid or succinic acid aqueous solution is 20%.
Specifically, the impregnation ratio of the modification liquid to the activated carbon is 3: 1, ensuring the uniformity and the sufficiency of impregnation, thereby ensuring the modification effect of the activated carbon.
Specifically, in step S2, the frequency of shaking table oscillation is controlled at 150r/min ± 5, and the oscillation treatment is maintained for 1 hour to ensure that oxalic acid, phosphoric acid or succinic acid is fully adsorbed on the surface of the activated carbon and fully impregnated.
Specifically, the drying temperature in the step S3 is controlled to be 150-200 ℃, and does not exceed the boiling point of oxalic acid, phosphoric acid or succinic acid, so as to ensure that oxalic acid, phosphoric acid or succinic acid does not volatilize in the drying process.
The active carbon is coconut shell active carbon activated by steam or potassium hydroxide, and the coconut shell active carbon belongs to the category of shell active carbon, and is mainly characterized by small density, light hand feeling, large specific surface area, sufficient pore structure and convenient adsorption and modification reaction.
Specifically, the modified activated carbon produced by the method is used in a filter, a pore structure is utilized to adsorb gaseous micromolecules, phosphoric acid on the surface of the activated carbon and ammonia gas are utilized to generate a neutralization reaction, and the ammonia gas is removed, so that the aim of purifying the air is fulfilled.
Example 2: as shown in fig. 2, a method for modifying activated carbon to remove ammonia gas from air includes the following steps:
step S1: pretreating active carbon; cleaning the activated carbon by using hydrochloric acid, and opening an activated carbon pore channel;
step S2: performing active carbon modification treatment; using oxalic acid or phosphoric acid or succinic acid aqueous solution as a modifying solution to impregnate the activated carbon, and carrying out oscillation treatment on the activated carbon impregnated by the modifying solution;
step S3: drying the activated carbon; filtering the modified solution, and drying the activated carbon.
Further, step S1 includes a step of dredging pores of the activated carbon, first, immersing the activated carbon in water, shaking the activated carbon and the immersion water, and dredging the pores; then, the activated carbon is washed by hydrochloric acid, and the pore channels of the activated carbon are opened.
In step S2, the shaking process is performed by using a shaking table. Shaking the shaking table and shaking the processing can make oxalic acid or phosphoric acid or succinic acid fully load to the active carbon in each hole, improve the oxalic acid or phosphoric acid or succinic acid load capacity of active carbon to promote the adsorption capacity of active carbon to ammonia.
Step S3 further includes a step of removing large water droplets on the surface; firstly, removing large-particle water drops on the surface; then, the modified liquid is filtered again, the activated carbon is dried by adopting a rotary furnace, so that the modified activated carbon is heated uniformly, and the adhesion of the activated carbon caused by the impregnation of oxalic acid, phosphoric acid or succinic acid is prevented.
Further, step S2 includes the step of removing the adsorbed contaminant gas inside the activated carbon; firstly, putting activated carbon in a closed environment for vacuumizing treatment by a vacuum impregnation method to remove part of polluted gas adsorbed in the activated carbon; then, injecting a dilute nitric acid, oxalic acid or phosphoric acid or succinic acid impregnation solution into a closed container to be fully mixed with the active carbon, impregnating the active carbon by using an oxalic acid or phosphoric acid or succinic acid aqueous solution as a modification solution, and carrying out oscillation treatment on the modified solution impregnated active carbon to further improve the loading capacity of the active carbon for oxalic acid or phosphoric acid or succinic acid. Through a vacuum impregnation method, firstly, the activated carbon is placed in a closed environment for vacuumizing treatment, part of pollutant gas adsorbed in the activated carbon is removed, and then, oxalic acid or phosphoric acid or succinic acid impregnation solution is injected into a closed container to be fully mixed with the activated carbon, so that the loading capacity of the activated carbon for oxalic acid or phosphoric acid or succinic acid can be further improved.
Further, step S1 is a step of opening pores of the activated carbon; using excessive pure water to dip the activated carbon, and further dredging pores by adopting ultrasonic oscillation after excessive pure water dipping;
further, step S3 is a step of removing the adsorbed pollutant gas inside the activated carbon, and removing large water droplets on the surface by centrifugation. The centrifugation speed is not too fast, the time is not too long, and the oxalic acid or the phosphoric acid or the succinic acid loaded by the active carbon is prevented from being removed.
Further, the method also comprises a step of S4 temperature reduction, wherein high-purity nitrogen is adopted to sweep the activated carbon or naturally reduce the temperature under the nitrogen protection condition, so that the activated carbon is prevented from adsorbing ammonia in the air, and the adsorption effect of a customer site is prevented from being influenced.
Further, the method also comprises a step of S5 packaging, and the cooled activated carbon is hermetically packaged.
Further, in step S1, after the activated carbon is washed with hydrochloric acid, it is washed with water to make the activated carbon neutral. And redundant hydrochloric acid on the surface of the activated carbon is washed away, so that the reaction of the modified solution and the hydrochloric acid is avoided, and more modified solution is consumed in the dipping process.
The hydrochloric acid solution in the step S1 has a concentration of 2% to 10%, preferably, the hydrochloric acid solution has a concentration of 5%, and the activated carbon is washed with an excessive amount of the hydrochloric acid solution, so that more pore structures are formed on the surface of the activated carbon, and the specific surface area is increased.
The concentration of the oxalic acid or phosphoric acid or succinic acid aqueous solution in the step S2 is 10% to 30%, preferably, the concentration of the phosphoric acid aqueous solution is 20%, and the concentration of the nitric acid is lower than 5%.
In the step S2, the impregnation ratio of the modification solution to the activated carbon is 1: 1 to 5: 1. Preferably, the impregnation ratio of the modifying solution to the activated carbon is 3: 1, ensuring the uniformity and the sufficiency of impregnation, thereby ensuring the modification effect of the activated carbon.
Further, in step S2, the oscillating frequency of the shaking table is controlled at 150r/min + -5, and the oscillating treatment is maintained for 0.5-1.5 hours; ensuring that oxalic acid or phosphoric acid or succinic acid is fully adsorbed on the surface of the active carbon and fully impregnated.
And the drying temperature of the step S3 is controlled to be 150-200 ℃. The boiling point of the oxalic acid, the phosphoric acid or the succinic acid is not exceeded, and the oxalic acid, the phosphoric acid or the succinic acid is prevented from volatilizing in the drying process.
Further, the activated carbon is coconut shell activated carbon activated by water vapor or potassium hydroxide; the air purification active carbon adopts coconut shell active carbon with CTC value of 80-100 and iodine value of more than 1200, preferably, the air purification active carbon adopts coconut shell active carbon with CTC value of about 90 and iodine value of more than 1200, and has larger specific surface area and better mechanical strength than common coal-made carbon. The coconut shell activated carbon belongs to the category of shell activated carbon, and is mainly characterized by small density, light hand feeling, large specific surface area, sufficient pore structure and convenient adsorption and modification reaction.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (10)
1. An active carbon modification method for removing ammonia gas in air is characterized by comprising the following steps:
step S1: pretreating active carbon; cleaning the activated carbon by using hydrochloric acid, and opening an activated carbon pore channel;
step S2: performing active carbon modification treatment;
oxidizing the surface of the activated carbon by using a nitric acid aqueous solution to generate oxygen-containing functional groups such as carboxyl and the like, so that the phenomenon that the pore structure of the activated carbon is damaged by excessively high-concentration nitric acid is avoided, and the adsorption capacity of the activated carbon on ammonia is improved;
oxalic acid or phosphoric acid or succinic acid which is not easy to volatilize at normal temperature is used for dipping the activated carbon, so that a large amount of acidic substances are loaded on the surface of the activated carbon to increase the adsorption capacity of the activated carbon on ammonia;
carrying out oscillation treatment on the modified liquid impregnated activated carbon to ensure that the activated carbon is uniformly impregnated;
step S3: drying the activated carbon; filtering the modified solution, and drying the activated carbon.
2. The method for modifying activated carbon to remove ammonia gas from air according to claim 1, wherein:
step S1 also includes the step of dredging the pores of the activated carbon, firstly, the activated carbon is soaked by water, and the activated carbon and the soaked water are vibrated to dredge the pores; then, using hydrochloric acid to clean the activated carbon, and opening the pore channel of the activated carbon;
step S2, oscillating the mixture by using a shaking table;
step S3 further includes a step of removing large water droplets on the surface; firstly, removing large-particle water drops on the surface; then, the modified liquid is filtered, the activated carbon is dried by adopting a rotary furnace, so that the modified activated carbon is uniformly heated, and the activated carbon adhesion caused by the dipping of phosphoric acid and the like is prevented.
3. The method for modifying activated carbon to remove ammonia gas from air according to claim 1, wherein: step S2 also includes the step of removing the pollutant gas adsorbed in the activated carbon; firstly, putting activated carbon in a closed environment for vacuumizing treatment by a vacuum impregnation method to remove part of polluted gas adsorbed in the activated carbon; then, injecting a normal-temperature nonvolatile acid dipping mixed solution of nitric acid and oxalic acid, or nitric acid and phosphoric acid, or nitric acid and succinic acid into a closed container to be fully mixed with the activated carbon, using a normal-temperature nonvolatile acid mixed aqueous solution of nitric acid and oxalic acid, or nitric acid and phosphoric acid, or nitric acid and succinic acid as a modification solution to dip the activated carbon, and carrying out oscillation treatment on the modification solution dipped activated carbon to further improve the normal-temperature nonvolatile acid loading capacity of the activated carbon, such as oxalic acid, phosphoric acid or succinic acid.
4. The method for modifying activated carbon to remove ammonia gas from air according to claim 2, wherein: step S1, dredging pores of the activated carbon; and (3) using excessive pure water to dip the activated carbon, and further dredging pores by adopting ultrasonic oscillation after excessive pure water dipping.
5. The method for modifying activated carbon to remove ammonia gas from air according to claim 3, wherein: step S3 is a step of removing the adsorbed polluted gas in the activated carbon, and large water drops on the surface are removed in a centrifugal mode.
6. The method for modifying activated carbon to remove ammonia gas from air according to claim 1, wherein: the method also comprises a step of S4 temperature reduction, wherein high-purity nitrogen is adopted to sweep the activated carbon or naturally reduce the temperature under the nitrogen protection condition, thereby avoiding the influence of the activated carbon on the adsorption effect of a customer site by the ammonia gas in the air.
7. The method for modifying activated carbon to remove ammonia gas from air according to claim 5, wherein: and S5, hermetically packaging the cooled activated carbon.
8. The method for modifying activated carbon to remove ammonia gas from air according to claim 1, wherein: step S1, washing the activated carbon with hydrochloric acid, and then washing the activated carbon to be neutral; the concentration of the hydrochloric acid solution in the step S1 is 2% -10%; the concentration of the nitric acid solution in the step S2 is lower than 5%; the concentration of the acid solution which is difficult to volatilize at normal temperature, such as oxalic acid, phosphoric acid or succinic acid, etc., is 10 to 30 percent; the impregnation ratio of all the acid modification solution to the activated carbon in step S2 is 1: 1 to 5: 1.
9. The method for modifying activated carbon to remove ammonia gas from air according to claim 2, wherein: in step S2, the oscillating frequency of the shaking table is controlled at 150r/min +/-5, and the oscillating treatment is maintained for 0.5-1.5 hours; and the drying temperature of the step S3 is controlled to be 150-200 ℃.
10. The method for modifying activated carbon to remove ammonia gas from air according to claim 1, wherein: the active carbon is coconut shell active carbon activated by water vapor or potassium hydroxide and coal columnar active carbon; the activated carbon for air purification adopts coconut shell activated carbon with CTC value of 80-100 and iodine value of more than 1200, and has larger specific surface area and better mechanical strength than common coal-made carbon.
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Application publication date: 20201027 |