CN114011379A - Nitrogen oxide adsorbent and preparation method thereof - Google Patents

Nitrogen oxide adsorbent and preparation method thereof Download PDF

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CN114011379A
CN114011379A CN202111382027.8A CN202111382027A CN114011379A CN 114011379 A CN114011379 A CN 114011379A CN 202111382027 A CN202111382027 A CN 202111382027A CN 114011379 A CN114011379 A CN 114011379A
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nitrogen oxide
oxide adsorbent
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nitrate
nitric acid
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刘靖
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Shenzhen Tiandeyi Environment Technology Co ltd
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • 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
    • 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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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
    • B01J20/3204—Inorganic carriers, supports or substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
    • B01J20/3244—Non-macromolecular compounds
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    • B01D2257/40—Nitrogen compounds

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Abstract

The invention discloses a nitrogen oxide adsorbent and a preparation method thereof, and relates to the technical field of environmental protection. The nitrogen oxide adsorbent comprises the following raw material components: activated carbon fiber, aqueous urea solution, and NH4Cl、H2O2Solution, metal nitrate, nitric acid and water. The nitrogen oxide adsorbent provided by the invention has stronger adsorption capacity and high adsorption rate, can be used in outdoor environment or a factory building with unorganized emission, can adsorb and purify nitrogen oxide in a large amount of air by using a high-air-volume fan, has good quality and ventilation performance, is not easy to damage, and can be used for multiple timesCan be repeatedly used.

Description

Nitrogen oxide adsorbent and preparation method thereof
Technical Field
The invention relates to the technical field of environmental protection, in particular to a nitrogen oxide adsorbent and a preparation method thereof.
Background
Along with the rapid industrial process and rapid economic development of China, the environment pollution condition is increasingly serious, the emission and concentration of global nitrogen oxides in the atmosphere are continuously improved, and the nitrogen oxides become important factors for inducing ozone pollution, photochemical smog and acid rain. Has become a main air pollution source in south China and part of developed cities, and has serious influence on ecosystem and daily life of human beings. Under the requirement of national atmospheric pollution prevention and control combat, the emission of nitrogen oxides as important pollutants must be greatly reduced, so that research and development of nitrogen oxide treatment in atmospheric pollutants are urgent.
The existing methods for eliminating and treating nitrogen oxides mainly comprise a selective catalytic reduction method, a selective non-catalytic reduction method, a selective catalytic oxidation method, a low-temperature plasma method and the like, and the methods are generally used for treating the exhaust emission of enterprises and cannot be used for treating low-concentration nitrogen oxides in the atmospheric environment, and in addition, the used nitrogen oxide adsorbent cannot be reused.
Disclosure of Invention
The invention mainly aims to provide a nitrogen oxide adsorbent and a preparation method thereof, and aims to provide the nitrogen oxide adsorbent which is suitable for adsorbing low-concentration nitrogen oxide, has high adsorption rate and can be repeatedly used.
In order to achieve the purpose, the invention provides a nitrogen oxide adsorbent which comprises the following raw material components:
activated carbon fiber, aqueous urea solution, and NH4Cl、H2O2Solution, metal nitrate, nitric acid and water.
Optionally, the nitrogen oxide adsorbent comprises the following components in parts by mass:
90-110 parts of activated carbon fiber, 0.1-0.3 part of aqueous solution of urea and NH40.1 to 0.3 portion of Cl and H2O210-30 parts of solution, 0.4-0.6 part of metal nitrate, 20-40 parts of nitric acid and 190-210 parts of water.
Optionally, the metal nitrate comprises any one of nitrate of Cr, nitrate of Fe, nitrate of Mn, and nitrate of Ni.
Alternatively, the H2O2H in solution2O2The mass fraction of (A) is 10-15%.
Optionally, the concentration of urea in the urea aqueous solution is 0.2-0.5 mol/L.
Optionally, the mass fraction of the nitric acid is 10% to 30%.
Optionally, the molar amount of metal is 0.5% to 5% of the molar amount of the total nitrate in the metal nitrate and nitric acid.
The invention further provides a preparation method of the nitrogen oxide adsorbent, which comprises the following steps:
s10, mixing and reacting the activated carbon fiber with an aqueous solution of urea and ammonium chloride, filtering, and placing in H2O2Performing ultrasonic treatment in the solution to obtain a primary modified material;
s20, dissolving metal nitrate in nitric acid to form a mixed solution, and under the heating condition, immersing the primary modified material into the mixed solution for 7-9 hours, and filtering to obtain a secondary modified material;
and S30, drying the secondary modified material, and calcining to obtain the nitrogen oxide adsorbent.
Optionally, in step S20, the heating temperature is 70-90 ℃.
Optionally, in step S30, the calcination temperature is 700-800 ℃.
In the technical scheme, the invention provides a nitrogen oxide adsorbent, which takes activated carbon fibers with large specific surface area as a carrier to carry out activation modification, and adopts urea and NH4Performing surface nitrogen modification on the activated carbon fibers by Cl, and then activating by hydrogen peroxide, so that the nitrogen content of the surfaces of the activated carbon fibers is increased, the amination degree of the surfaces of the activated carbon fibers is regulated and controlled, and the adsorption of nitrogen oxides is promoted; the addition of metal nitrate and nitric acid adopts the modification of metal ions, so that the adsorption capacity and adsorption efficiency of the active carbon fiber to nitrogen oxides are further improved. The nitrogen oxide adsorbent provided by the invention has stronger adsorption capacity and high adsorption rate, can be used in outdoor environment or a factory building with unorganized emission, can adsorb and purify nitrogen oxides in a large amount of air by using a high-air-volume fan, has good quality and ventilation performance, is not easy to damage, and can be repeatedly used for many times.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic flow chart of an embodiment of a method for preparing a nitrogen oxide adsorbent according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front, rear, outer and inner … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The existing methods for eliminating and treating nitrogen oxides mainly comprise a selective catalytic reduction method, a selective non-catalytic reduction method, a selective catalytic oxidation method, a low-temperature plasma method and the like, and the methods are generally used for treating the exhaust emission of enterprises and cannot be used for treating low-concentration nitrogen oxides in the atmospheric environment, and in addition, the used nitrogen oxide adsorbent cannot be reused.
In view of the above, the present invention provides a nitrogen oxide adsorbent, and aims to provide a nitrogen oxide adsorbent which is suitable for adsorbing low-concentration nitrogen oxides, has a high adsorption rate, and can be reused.
The invention provides a nitrogen oxide adsorbent which comprises the following raw material components:
activated carbon fiber, aqueous urea solution, and NH4Cl、H2O2Metal nitrate, nitric acid and water.
In the technical scheme of the invention, the nitrogen oxide adsorbent takes active carbon fibers with large specific surface area as a carrier to carry out activation modification, and adopts urea and NH4Performing surface nitrogen modification on the activated carbon fibers by Cl, and then activating by hydrogen peroxide, so that the nitrogen content of the surfaces of the activated carbon fibers is increased, the amination degree of the surfaces of the activated carbon fibers is regulated and controlled, and the adsorption of nitrogen oxides is promoted; the addition of metal nitrate and nitric acid adopts the modification of metal ions, so that the adsorption capacity and adsorption efficiency of the active carbon fiber to nitrogen oxides are further improved. The nitrogen oxide adsorbent provided by the invention has stronger adsorption capacity and high adsorption rate, can be used in outdoor environment or a factory building with unorganized emission, can adsorb and purify nitrogen oxides in a large amount of air by using a high-air-volume fan, has good quality ventilation performance, is not easy to damage, can be repeatedly used for multiple times, greatly improves the adsorption capacity of the material on the nitrogen oxides, and is easy to realize industrialization.
The raw material of the carrier is the activated carbon fiber, has large specific surface area, wide source, low price, stable performance and high safety coefficient, and accords with the current technical development trend at home and abroad. In addition, the nitrogen oxide adsorbent provided by the invention has high adsorption efficiency on nitrogen dioxide, the adsorption rate on nitrogen dioxide is more than 95%, and the adsorption rate on nitric oxide is more than 45%.
The invention is not limited by the ratio of each component in the nitrogen oxide adsorbent, and preferably, the nitrogen oxide adsorbent comprises the following components in parts by weight:
90-110 parts of activated carbon fiber, 0.1-0.3 part of aqueous solution of urea and NH40.1 to 0.3 portion of Cl and H2O210-30 parts of metal nitrate, 0.4-0.6 part of nitric acid, 20-40 parts of nitric acid and 190-210 parts of water.
Under the proportion, the obtained nitrogen oxide adsorbent has better adsorption capacity and more stable performance, can be adsorbed at normal temperature, and has high repeated use times.
More preferably, the nitrogen oxide adsorbent comprises the following components in parts by mass: 100 parts of activated carbon fiber, 0.2 part of urea aqueous solution and NH4Cl 0.23 part, H2O220 parts of metal nitrate, 0.5 part of nitric acid and 200 parts of water. Research shows that the nitrogen oxide adsorbent prepared by the above proportion has the best adsorption capacity and the most stable performance, can be adsorbed at normal temperature, and has the highest repeated use times.
Preferably, said H2O2H in solution2O2The mass fraction of (A) is 10-15%. At the above concentration, the activating effect is the best, so that the adsorbing capacity of the nitrogen oxide adsorbent is strong.
Preferably, the concentration of the urea in the aqueous solution of the urea is 0.2-0.5 mol/L. Therefore, nitrogen can be uniformly formed on the surface of the activated carbon fiber, the amination degree of the surface of the activated carbon fiber is regulated and controlled, and the adsorption of nitrogen oxides is promoted.
Preferably, the mass fraction of the nitric acid is 10-30%. The addition of nitric acid provides an acidic environment for the preparation of the nitrogen oxide adsorbent, is beneficial to loading metal ions on the surface of the activated carbon fiber carrier, and further improves the adsorption capacity and adsorption efficiency of the activated carbon fiber on nitrogen oxide.
Preferably, the molar amount of metal is 0.5% to 5% of the molar amount of the total nitrate in the metal nitrate and nitric acid. Under the above proportion, the metal ions can be loaded on the surface of the activated carbon fiber carrier, and the adsorption capacity and adsorption efficiency of the activated carbon fiber to nitrogen oxides are further improved.
The present invention further provides a method for preparing the above-mentioned nitrogen oxide adsorbent, referring to fig. 1, the method for preparing the nitrogen oxide adsorbent provided by the present invention comprises the following steps:
s10, mixing and reacting the activated carbon fiber with an aqueous solution of urea and ammonium chloride, filtering, and placing in H2O2And carrying out ultrasonic treatment in the solution to obtain the primary modified material.
In the step, the active carbon fiber is modified by hydrogen peroxide solution, urea solution and ammonium chloride, and urea and NH are used4Cl carries out surface nitrogen modification on the activated carbon fiber, and hydrogen peroxide is adopted for ultrasonic activation, so that the nitrogen content on the surface of the activated carbon fiber is increased, the surface amination degree of the activated carbon fiber is regulated and controlled, and the adsorption of nitrogen oxides is promoted.
S20, dissolving metal nitrate in nitric acid to form a mixed solution, and filtering out after the primary modified material is immersed in the mixed solution for 7-9 hours under a heating condition to obtain a secondary modified material.
In the step, the primary modified material is modified for the second time, and the primary modified material is modified by metal ions, so that the adsorption capacity and the adsorption efficiency of the active carbon fiber on the nitric oxide are further improved. Preferably, the heating temperature is 70-90 ℃, more preferably 80 ℃, so that the metal ions are fully loaded on the surface of the primary modified material.
And S30, drying the secondary modified material, and calcining to obtain the nitrogen oxide adsorbent.
In the step, the secondary modified material is dried and calcined, the drying temperature is 100 ℃, preferably, the calcining temperature is 700-800 ℃, more preferably 750 ℃, so that the activated carbon fiber is further activated, modified nitrogen metal ions on the surface of the activated carbon fiber are fused at high temperature, the activated carbon fiber is more uniform, and the adsorption capacity to nitrogen oxides is stronger.
According to the preparation method of the nitrogen oxide adsorbent provided by the invention, urea and ammonium chloride are firstly adopted for surface nitrogen modification of the activated carbon fiber in the first modification, hydrogen peroxide is adopted for ultrasonic activation, the activated carbon fiber is subjected to impregnation treatment by using an activating solution of metal ions and dilute nitric acid in the second modification, and then high-temperature co-combustion is carried out, so that the adsorption capacity and the adsorption efficiency of the activated carbon fiber on nitrogen oxide are improved, and the adsorption rate of nitrogen dioxide is up to 95% within 2 hours under the condition that the wind speed is 4 m/s. The adsorption rate of the nitrogen dioxide is as high as 85 percent within 2 to 6 hours. And the prepared nitrogen oxide adsorbent has all the beneficial effects of the nitrogen oxide adsorbent, and is not repeated herein.
An example of the method for producing the nitrogen oxide adsorbent according to the present invention is given below:
the weight parts of the components are as follows: 90-110 parts of activated carbon fiber, 0.1-0.3 part of aqueous solution of urea and NH40.1 to 0.3 portion of Cl and H2O210-30 parts of solution, 0.4-0.6 part of metal nitrate, 20-40 parts of nitric acid and 190-210 parts of water, wherein the metal nitrate comprises any one of nitrate of Cr, nitrate of Fe, nitrate of Mn and nitrate of Ni; h2O2H in solution2O2The mass fraction of (A) is 10-15%; in the aqueous solution of urea, the concentration of the urea is 0.2-0.5 mol/L; the mass fraction of the nitric acid is 10 to 30 percent; the molar weight of the metal is 0.5 to 5 percent of the total molar weight of nitrate radical in the metal nitrate and nitric acid.
(1) Mixing activated carbon fiber with aqueous solution of urea and ammonium chloride, reacting, filtering, and placing in H2O2Performing ultrasonic treatment in the solution to obtain a primary modified material;
(2) dissolving metal nitrate in nitric acid to form a mixed solution, and under the heating condition of 70-90 ℃, soaking the primary modified material in the mixed solution for 7-9 hours, and then filtering out to obtain a secondary modified material;
(3) and drying the secondary modified material, and calcining at 700-800 ℃ to obtain the nitrogen oxide adsorbent.
The technical solution of the present invention is further described in detail with reference to the following specific examples, which should be understood that the following examples are only for illustrating the present invention and are not intended to limit the present invention, and in the examples, 1g is 1 part.
Example 1
The weight parts of the components are as follows: 100 parts of activated carbon fiber, 0.2 part of urea aqueous solution and NH4Cl0.2 parts, H2O220 parts of solution, 0.5 part of metal nitrate, 30 parts of nitric acid and 200 parts of water, wherein the metal nitrate comprises nitrate of Cr; h2O2H in solution2O2The mass fraction of (A) is 10%; in the aqueous solution of urea, the concentration of urea is 0.2 mol/L; the mass fraction of the nitric acid is 10 percent; the molar amount of the metal was 0.5% of the total molar amount of nitrate in the metal nitrate and nitric acid.
(1) Mixing activated carbon fiber with aqueous solution of urea and ammonium chloride, reacting, filtering, and placing in H2O2Performing ultrasonic treatment in the solution to obtain a primary modified material;
(2) dissolving metal nitrate in nitric acid to form a mixed solution, immersing the primary modified material in the mixed solution for 8 hours under the heating condition of 80 ℃, and filtering to obtain a secondary modified material;
(3) and (3) drying the secondary modified material, and calcining at 750 ℃ to obtain the nitrogen oxide adsorbent.
Example 2
The weight parts of the components are as follows: 90 parts of activated carbon fiber, 0.3 part of urea aqueous solution and NH4Cl 0.1 part, H2O230 parts of solution, 0.4 part of metal nitrate, 40 parts of nitric acid and 190 parts of water, wherein the metal nitrate comprises nitrate of Fe; h2O2H in solution2O2The mass fraction of (A) is 15%; in the aqueous solution of urea, the concentration of urea is 0.2 mol/L; the mass fraction of the nitric acid is 30 percent; the molar amount of the metal is 5% of the total molar amount of nitrate in the metal nitrate and nitric acid.
(1) Activated carbon fiberMixing with urea water solution and ammonium chloride, filtering, and placing in H2O2Performing ultrasonic treatment in the solution to obtain a primary modified material;
(2) dissolving metal nitrate in nitric acid to form a mixed solution, immersing the primary modified material into the mixed solution for 9 hours under the heating condition of 70 ℃, and filtering to obtain a secondary modified material;
(3) and (3) drying the secondary modified material, and calcining at 700 ℃ to obtain the nitrogen oxide adsorbent.
Example 3
The weight parts of the components are as follows: 110 parts of activated carbon fiber, 0.3 part of urea aqueous solution and NH4Cl0.3 parts, H2O210 parts of solution, 0.6 part of metal nitrate, 20 parts of nitric acid and 210 parts of water, wherein the metal nitrate comprises nitrate of Mn; h2O2H in solution2O2The mass fraction of (A) is 12.5%; in the aqueous solution of urea, the concentration of urea is 0.5 mol/L; the mass fraction of the nitric acid is 20 percent; the molar amount of metal was 2.7% of the total molar amount of nitrate in the metal nitrate and nitric acid.
(1) Mixing activated carbon fiber with aqueous solution of urea and ammonium chloride, reacting, filtering, and placing in H2O2Performing ultrasonic treatment in the solution to obtain a primary modified material;
(2) dissolving metal nitrate in nitric acid to form a mixed solution, immersing the primary modified material in the mixed solution for 7 hours under the heating condition of 90 ℃, and filtering to obtain a secondary modified material;
(3) and (3) drying the secondary modified material, and calcining at 800 ℃ to obtain the nitrogen oxide adsorbent.
Example 4
The weight parts of the components are as follows: 95 parts of activated carbon fiber, 0.1 part of urea aqueous solution and NH4Cl 0.1 part, H2O215 parts of solution, 0.4 part of metal nitrate, 25 parts of nitric acid and 195 parts of water, wherein the metal nitrate comprises nitrate of Ni; h2O2H in solution2O2The mass fraction of (A) is 13%; in the aqueous solution of urea, the concentration of urea is 0.35 mol/L; the mass fraction of the nitric acid is 15 percent; metalIs 3% of the total molar amount of nitrate in the metal nitrate and nitric acid.
(1) Mixing activated carbon fiber with aqueous solution of urea and ammonium chloride, reacting, filtering, and placing in H2O2Performing ultrasonic treatment in the solution to obtain a primary modified material;
(2) dissolving metal nitrate in nitric acid to form a mixed solution, immersing the primary modified material in the mixed solution for 7 hours under the heating condition of 75 ℃, and filtering to obtain a secondary modified material;
(3) and drying the secondary modified material, and calcining at 780 ℃ to obtain the nitrogen oxide adsorbent.
Example 5
The weight parts of the components are as follows: 105 parts of activated carbon fiber, 0.2 part of urea aqueous solution and NH4Cl0.3 part, H2O225 parts of solution, 0.6 part of metal nitrate, 35 parts of nitric acid and 205 parts of water, wherein the metal nitrate comprises nitrate of Ni; h2O2H in solution2O2The mass fraction of (A) is 11%; in the aqueous solution of urea, the concentration of urea is 0.25 mol/L; the mass fraction of the nitric acid is 25 percent; the molar amount of the metal is 1% of the total molar amount of nitrate in the metal nitrate and nitric acid.
(1) Mixing activated carbon fiber with aqueous solution of urea and ammonium chloride, reacting, filtering, and placing in H2O2Performing ultrasonic treatment in the solution to obtain a primary modified material;
(2) dissolving metal nitrate in nitric acid to form a mixed solution, immersing the primary modified material into the mixed solution for 9 hours under the heating condition of 85 ℃, and filtering to obtain a secondary modified material;
(3) and drying the secondary modified material, and calcining at 720 ℃ to obtain the nitrogen oxide adsorbent.
The nitrogen oxide adsorbent obtained in examples 1 to 5 was adsorbed at normal temperature and 25 ℃ under the conditions that the concentration of nitrogen dioxide was 20 to 40 micrograms per cubic meter and the wind speed was 4m/s, and the adsorption rate within 2 hours and the adsorption rate within 2 to 6 hours were measured, to obtain table 1.
Table 1 examples 1-5 nitrogen oxide adsorbents for nitrogen dioxide adsorption rate
Adsorption Rate within 2h (%) Adsorption rate (%) -2-6 h
Example 1 98％ 85％
Example 2 96％ 85％
Example 3 96％ 81％
Example 4 95％ 83％
Example 5 96％ 83％
As can be seen from table 1, the nitrogen oxide adsorbents obtained in examples 1 to 5 exhibited excellent adsorption performance, in which the adsorption rate of nitrogen dioxide was 95% or more within 2 hours, and the decrease in the adsorption rate was small with the lapse of time.
After the adsorption rate is measured, the nitrogen oxide adsorbent obtained in the embodiment 1 is placed in a water bath, heated for 2 hours at 100 ℃, desorption and activation are completed, an adsorption experiment is carried out again, and repeating the adsorption-desorption and activation for 5 times shows that the nitrogen oxide adsorbent still has high adsorption capacity and good repeated use effect.
In conclusion, the nitrogen oxide adsorbent provided by the invention can adsorb low-concentration nitrogen oxides, has high adsorption rate, can be repeatedly used, has strong adsorption capacity, and can be widely applied to nitrogen oxide treatment.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. The nitrogen oxide adsorbent is characterized by comprising the following raw material components:
activated carbon fiber, aqueous urea solution, and NH4Cl、H2O2Solution, metal nitrate, nitric acid and water.
2. The nitrogen oxide adsorbent of claim 1, wherein the nitrogen oxide adsorbent comprises the following components in parts by mass:
90-110 parts of activated carbon fiber, 0.1-0.3 part of aqueous solution of urea and NH40.1 to 0.3 portion of Cl and H2O210-30 parts of solution, 0.4-0.6 part of metal nitrate, 20-40 parts of nitric acid and 190-210 parts of water.
3. The nitrogen oxide adsorbent of claim 1, wherein the metal nitrate comprises any one of a nitrate of Cr, a nitrate of Fe, a nitrate of Mn, and a nitrate of Ni.
4. The nitrogen oxide adsorbent of claim 2, which isCharacterized in that H is2O2H in solution2O2The mass fraction of (A) is 10-15%.
5. The nitrogen oxide adsorbent according to claim 2, wherein the concentration of urea in the aqueous solution of urea is 0.2 to 0.5 mol/L.
6. The nitrogen oxide adsorbent of claim 2, wherein the mass fraction of nitric acid is 10% to 30%.
7. The nitrogen oxide adsorbent of claim 2, wherein the molar amount of the metal is 0.5% to 5% of the molar amount of the total nitrate in the metal nitrate and the nitric acid.
8. A method for producing a nitrogen oxide adsorbent according to any one of claims 1 to 7, characterized by comprising the steps of:
s10, mixing and reacting the activated carbon fiber with an aqueous solution of urea and ammonium chloride, filtering, and placing in H2O2Performing ultrasonic treatment in the solution to obtain a primary modified material;
s20, dissolving metal nitrate in nitric acid to form a mixed solution, and under the heating condition, immersing the primary modified material into the mixed solution for 7-9 hours, and filtering to obtain a secondary modified material;
and S30, drying the secondary modified material, and calcining to obtain the nitrogen oxide adsorbent.
9. The method of producing a nitrogen oxide adsorbent according to claim 8, wherein in step S20, the heating temperature is 70 to 90 ℃.
10. The method of manufacturing a nitrogen oxide adsorbent according to claim 8, wherein in step S30, the calcination temperature is 700 to 800 ℃.
CN202111382027.8A 2021-11-19 2021-11-19 Nitrogen oxide adsorbent and preparation method thereof Pending CN114011379A (en)

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CN101884906A (en) * 2010-07-06 2010-11-17 上海纳米技术及应用国家工程研究中心有限公司 Modified honeycomb activated carbon with nitric oxide adsorption function and preparation method thereof
CN106179444A (en) * 2016-06-29 2016-12-07 陶雪芬 A kind of preparation method of activated carbon supported carbon doping graphite phase carbon nitride
CN106861422A (en) * 2015-12-13 2017-06-20 天津赫维科技有限公司 A kind of processing method of industrial nitrous oxides exhaust gas

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CN101879435A (en) * 2010-06-08 2010-11-10 华东理工大学 High-adsorption-capacity room-temperature nitrogen oxide adsorbent and preparation method thereof
CN101884906A (en) * 2010-07-06 2010-11-17 上海纳米技术及应用国家工程研究中心有限公司 Modified honeycomb activated carbon with nitric oxide adsorption function and preparation method thereof
CN106861422A (en) * 2015-12-13 2017-06-20 天津赫维科技有限公司 A kind of processing method of industrial nitrous oxides exhaust gas
CN106179444A (en) * 2016-06-29 2016-12-07 陶雪芬 A kind of preparation method of activated carbon supported carbon doping graphite phase carbon nitride

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