CN114735698A - Nitrogen and/or phosphorus adsorption doped material and preparation method and application thereof - Google Patents

Nitrogen and/or phosphorus adsorption doped material and preparation method and application thereof Download PDF

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CN114735698A
CN114735698A CN202210374398.XA CN202210374398A CN114735698A CN 114735698 A CN114735698 A CN 114735698A CN 202210374398 A CN202210374398 A CN 202210374398A CN 114735698 A CN114735698 A CN 114735698A
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nitrogen
phosphorus
adsorption
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porous biochar
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李允超
邢博
王树荣
张光学
袁定琨
池作和
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China Jiliang University
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Abstract

The invention discloses a nitrogen and/or phosphorus adsorption doped material and a preparation method and application thereof, wherein the preparation method of the nitrogen and phosphorus adsorption doped material comprises the following steps of a) pyrolysis: uniformly mixing the waste biomass with a low proportion of activating agent, performing high-temperature pyrolysis in an inert atmosphere, and removing the activating agent to obtain a porous biochar material; b) adsorption: mixing the porous biochar material with nitrogen and/or phosphorus water body pollutants by taking the porous biochar material prepared in the step a) as a matrix and taking the nitrogen and/or phosphorus water body pollutants as an external nitrogen and/or phosphorus source, so that the porous biochar material adsorbs nitrogen and/or phosphorus in the nitrogen and/or phosphorus water body pollutants to obtain an adsorbing material; c) thermal curing: sealing the adsorption material prepared in the step b) and carrying out curing heat treatment in an inert atmosphere to obtain a finished product, so that the problems of water eutrophication and phosphorus resource exhaustion can be solved, and the energy storage application of the cured material can be realized.

Description

Nitrogen and/or phosphorus adsorption doped material and preparation method and application thereof
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of doping materials, in particular to a nitrogen and/or phosphorus adsorption doping material and a preparation method and application thereof.
[ background of the invention ]
The biochar is a carbon-containing solid material, is a biomass pyrolysis solid product, has the characteristics of large specific surface area, developed pores, richness in surface functional groups and mineral substances and the like, and can be used as a cheap adsorbent or an electrode material for water pollutants and the like. Journal Bioresource Technology,2020,312:123614 reviews the use of biochar as a cheap adsorbent for water body pollutants. For the biochar electrode material, the electrochemical characteristics are influenced by the specific surface area, the pore structure and the surface functional groups. In the case of super capacitors, the ideal carbon electrode material should have excellent conductivity,Rich hierarchical pore channels and high wettability in electrolyte, thereby realizing rapid double electric layer effect and Faraday reaction. The specific non-carbon atoms, such as nitrogen atoms and/or phosphorus atoms, are doped in the carbon structure, so that the pseudo-capacitance characteristic of the capacitor can be improved, and the electrochemical characteristic of the electrode material can be greatly improved. Patent CN107658149A discloses a nitrogen-doped supercapacitor composite electrode material and a preparation method thereof, which is characterized in that urea and graphene are added in an ethanol solution for mixing and stirring, and then the mixture is transferred to a high-temperature microwave reaction kettle for reaction to prepare the nitrogen-doped graphene, wherein the capacitance of the nitrogen-doped graphene is 10% -20% higher than that of pure graphene, but the graphene is high in cost and difficult to popularize and use on a large scale. Journal Chemusschem, 2013.6(12):2330-2339 reports that phosphorus-rich carbon is prepared from coffee grounds by a phosphoric acid activation method, and phosphorus-containing functional groups such as P in the carbon2O7]4-、[PO3]-And P4O10The voltage window can be promoted to improve the energy density of the capacitor, however, an extra phosphor activator is still required to be added in the preparation process.
Eutrophication of water is a phenomenon that a large amount of nutrient substances such as nitrogen, phosphorus and the like enter a water-slowing area to cause algae and other plankton to rapidly breed, so that the dissolved oxygen in the water is reduced, and fishes and other organisms die in a large amount. Water eutrophication has become one of the environmental hot problems which need to be solved urgently in the world. In addition, nitrogen and phosphorus in the water seriously damage the ecological balance of the water, and are discarded as effective natural resources, so that waste is caused. The existing common methods for removing nitrogen and phosphorus in water bodies comprise biodegradation, ozone oxidation, ligand exchange, adsorption and the like. The adsorption method is one of the most effective eutrophic water body treatment methods at present due to simple process and reliable operation. The adsorbent used in the adsorption method can be charcoal. And the adsorbed eutrophication elements, namely nitrogen and phosphorus, exist in the form of molecules, ions or complexes in the pores of the biochar, and are combined with the biochar by virtue of van der Waals force, electrostatic force, dispersion force or chemical bond force. However, biochar enriched in nutritive elements is difficult to dispose, potential risks are caused to the environment when the biochar is directly returned to the field, and the biochar is difficult to regenerate.
[ summary of the invention ]
The invention aims to solve the problems in the prior art, and provides a nitrogen-phosphorus adsorption doped material, a preparation method and application thereof, which can convert nitrogen and/or phosphorus in nitrogen and/or phosphorus water pollutants into active nitrogen groups and/or active phosphorus groups and fix the active nitrogen groups and/or active phosphorus groups in a porous carbon material structure, realize the conversion of harmful pollutants into beneficial functional groups, solve the problem of water eutrophication, relieve the problem of phosphorus resource exhaustion, and synchronously realize the energy storage application of the solidified material.
In order to realize the purpose, the invention provides a preparation method of a nitrogen-phosphorus adsorption doped material, which comprises the following steps:
a) pyrolysis: uniformly mixing the waste biomass with a low proportion of activating agent, performing high-temperature pyrolysis in an inert atmosphere, and removing the activating agent to obtain a porous biochar material;
b) adsorption: mixing the porous biochar material prepared in the step a) with nitrogen and/or phosphorus water body pollutants as a matrix and nitrogen and/or phosphorus water body pollutants as an external source to adsorb nitrogen and/or phosphorus in the nitrogen and/or phosphorus water body pollutants by using the porous biochar material as a matrix so as to obtain an adsorbing material;
c) thermal curing: sealing the adsorbing material prepared in the step b) and carrying out curing heat treatment in an inert atmosphere to obtain a finished product.
Preferably, in step a), the mixing ratio of the activator to the waste biomass is not higher than 40%, and the activator is KOH or ZnCl2、NaHCO3、Na2CO3Or KHCO3One or more of the compositions, the modes for removing the activating agent are acid washing and water washing, and the specific surface area of the porous biochar material is not less than 50m2The pyrolysis temperature is 450-750 ℃.
Preferably, in the step b), the nitrogen content concentration, the phosphorus content concentration or the combined total concentration of nitrogen and phosphorus of the nitrogen and/or phosphorus water body pollutant is 0.1-100 g/L.
Preferably, the nitrogen and/or phosphorus water pollutant is an organic or inorganic liquid phase pollutant containing nitrogen and/or phosphorus elements.
Preferably, the organic liquid phase pollutant containing nitrogen and/or phosphorus elements is eutrophic water, and the inorganic liquid phase pollutant containing nitrogen and/or phosphorus elements is domestic sewage or chemical wastewater containing one or a combination of ammonium salt, nitrite, urea, aniline, phosphoric acid and phosphate.
Preferably, in the step b), the adding proportion of the porous biochar material to nitrogen and/or phosphorus water pollutants is 1-25 g/L, the adsorption temperature is 15-35 ℃, and the adsorption time is 2-48 h.
Preferably, in the step c), the sealing is specifically to place the adsorbing material in a closed cavity and cover the inert filler on the upper surface of the adsorbing material, the curing heat treatment temperature is 200-1000 ℃, and the curing heat treatment time is 0.5-5 hours. Furthermore, the curing heat treatment temperature is 500-800 ℃, and the curing heat treatment time is 1-3 h.
Preferably, the effective volume of the closed cavity is not higher than 105% of the packed volume of the adsorption material after compaction, and the total filling volume of the inert filler and the adsorption material is not lower than 99.5% of the effective volume of the closed cavity.
Preferably, the inert filler is 20-60 mesh quartz sand.
And in addition, the adsorption material and the inert material after being sealed are subjected to curing heat treatment in a curing furnace together. The closed container may be, but is not limited to, a crucible with a plug or a porcelain boat with a cover, and the curing furnace may be, but is not limited to, a fixed bed of a tube furnace.
The surface of the nitrogen-phosphorus adsorption doped material contains active nitrogen groups and/or active phosphorus groups, and if the nitrogen is contained, the nitrogen loading is 0.2-8 wt.%, and if the phosphorus is contained, the phosphorus loading is 0.4-10 wt.%. Furthermore, the active nitrogen group is one or more of pyridine nitrogen, pyrrole nitrogen and graphite nitrogen, and the active phosphorus group is a phosphate group.
An application of nitrogen-phosphorus adsorption doping material in the field of electric energy storage. Further, the field of electrical energy storage is the field of super capacitors or battery cathodes. Taking the super capacitor energy storage field as an example, a super capacitor electrode is assembled by nitrogen-phosphorus adsorption doping materials, a platinum sheet is taken as a counter electrode, saturated calomel is taken as a reference electrode, when the current density is 1A/g, the specific capacitance can reach more than 100F/g, and is improved by more than 10% compared with a super capacitor electrode assembled by undoped porous biochar.
The invention has the beneficial effects that:
1. according to the invention, the porous biochar material is used as a matrix, and the nitrogen and/or phosphorus water body pollutants are used as an exogenous nitrogen and/or phosphorus source, so that the adsorption effect and the thermosetting treatment of the porous biochar material and the nitrogen and/or phosphorus water body pollutants can be utilized to convert nitrogen and/or phosphorus into active nitrogen groups and/or active phosphorus groups and fix the active nitrogen groups and/or active phosphorus groups in the porous carbon material structure, so that the conversion of harmful pollutants to beneficial functional groups is realized, the problem of water eutrophication can be solved, the problem of phosphorus resource exhaustion can be relieved, and the energy storage application of the solidified material can be synchronously realized;
2. the pore structure in the porous biochar material can provide a spatial site for the adsorption of nitrogen and/or phosphorus water body pollutants, however, as the adsorbed nitrogen and/or phosphorus water body pollutants are mostly combined with the biochar by van der Waals force, electrostatic force, dispersion force or a small amount of chemical bond force, the thermal stability is poor, the invention leads the nitrogen and/or phosphorus on the surface of the carbon and in the bulk phase to interact under the thermal action by additionally arranging a curing heat treatment step, and simultaneously leads the nitrogen and/or phosphorus to be decomposed to generate NH2The P-O free radical and the like are chemically reacted with the carbon surface, and finally nitrogen and/or phosphorus are fixed on the carbon surface in the form of pyridine nitrogen, pyrrole nitrogen, graphite nitrogen or phosphate group and the like, so that a new surface active structural unit is endowed to the biochar, and the full utilization of the nitrogen and/or phosphorus is realized;
3. according to the invention, the adsorption material is subjected to thermocuring treatment in a closed space, so that desorption of nitrogen and/or phosphorus during curing can be effectively avoided, and further loss of the nitrogen and/or phosphorus is caused;
4. according to the invention, the nitrogen and/or phosphorus adsorption doping material is applied to the field of electric energy storage, and the active nitrogen group and/or active phosphorus group can be utilized to improve the conductivity and wettability of the electrode material, so that the electrode material can be in full contact with electrolyte, and a Faraday pseudo capacitor is provided on the other hand, so that the specific capacity and the cycle rate are enhanced, and then the super capacitor material with pseudo capacitor and double electric layer characteristics is synthesized.
The features and advantages of the present invention will be described in detail by embodiments in conjunction with the accompanying drawings.
[ description of the drawings ]
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a plot of cyclic voltammetry measurements of the samples before and after adsorption of example one;
FIG. 3 is a constant current charge and discharge curve of the samples before and after adsorption of example two.
[ detailed description ] A
The first embodiment is as follows:
corn stalks are used as waste biomass, the surfaces of the corn stalks are washed firstly, and then the corn stalks are dried after impurities are removed. Subsequently, 10g of cornstalks were weighed out in a mass ratio of 20% of activating agent (NaHCO)3) Mechanically mixing, putting the mixture into a 600 ℃ tubular furnace for high-temperature pyrolysis, cooling, washing the mixture for several times by using hydrochloric acid and deionized water, and drying to obtain the porous biochar material. It was found to have a specific surface of 180m2/g。
Preparing 20g/L urea solution to simulate nitrogen water pollutants, and adding the porous biochar material into the urea solution according to the addition ratio of 5g/L for adsorption. Wherein the adsorption temperature is 25 ℃, the adsorption time is 24h, and the adsorption material is obtained.
And then, transferring the adsorbing material into a crucible with a plug, covering quartz sand for filling, then placing the adsorbing material and the quartz sand together into an inert atmosphere tube furnace for curing heat treatment, and removing the quartz sand after cooling to obtain a finished product. Wherein the curing heat treatment temperature is 600 ℃, and the curing heat treatment time is 2 hours. Elemental analysis and x-ray photoelectron spectroscopy test analysis show that the nitrogen loading of the doping material is 1.72 wt%, which is 21% higher than that of unadsorbed porous biochar.
Mixing the nitrogen adsorption doping material, acetylene black and polyvinylidene fluoride according to the mass ratio of 8: 1: 1, preparing a working electrode, forming a three-electrode testing system by the working electrode, a platinum electrode and a calomel electrode, and testing the cyclic voltammetry characteristic and the constant current charge-discharge characteristic of the working electrode by using an electrochemical workstation by taking 6M potassium hydroxide solution as electrolyte. Referring to fig. 2, the specific capacitance of the electrode at 1A/g is measured to be 123F/g, while the specific capacitance of the undoped porous biochar is 111F/g, and the performance is improved by 10.8%.
Example two:
the bamboo sawdust is used as waste biomass, the surface of the waste biomass is washed, and then the waste biomass is dried after impurities are removed. Subsequently, 10g of bamboo chips was weighed out, and 10% by mass of an activator (K)2C2O4) Mechanically mixing, putting the mixture into a 600 ℃ tubular furnace for high-temperature pyrolysis, cooling, washing the mixture for several times by using hydrochloric acid and deionized water, and drying to obtain the porous biochar material. It was found to have a specific surface area of 167m2/g。
Preparing 100g/L urea solution to simulate nitrogen water pollutants, and adding the porous biochar material into the urea solution according to the addition ratio of 5g/L for adsorption. Wherein the adsorption temperature is 25 ℃, the adsorption time is 24h, and the adsorption material is obtained.
And then, transferring the adsorbing material into a crucible with a plug, covering quartz sand for filling, then placing the adsorbing material and the quartz sand together into an inert atmosphere tube furnace for curing heat treatment, and removing the quartz sand after cooling to obtain a finished product. Wherein the curing heat treatment temperature is 600 ℃, and the curing heat treatment time is 2 hours. Elemental analysis and x-ray photoelectron spectroscopy test analysis show that the nitrogen loading capacity of the doping material is 2.35 wt%, and is improved by 65% compared with that of unadsorbed porous biochar.
Mixing the nitrogen adsorption doping material, acetylene black and polyvinylidene fluoride according to the mass ratio of 8: 1: 1, preparing a working electrode, forming a three-electrode testing system by the working electrode, a platinum electrode and a calomel electrode, and testing the cyclic voltammetry characteristic and the constant current charge-discharge characteristic of the working electrode by using an electrochemical workstation by taking 6M potassium hydroxide solution as electrolyte. Referring to FIG. 3(a is a sample before adsorption, b is a sample after adsorption), the specific capacitance of the electrode at 1A/g is 161F/g, while the specific capacitance of the undoped porous biochar is 129F/g, which is a 24.8% improvement.
The greatest difference between the second embodiment and the first embodiment is that the concentration of the adsorbed nitrogen water pollutants is improved, and the results show that the beneficial effects are improved.
Example three:
bamboo sawdust is used as waste biomass, the surface of the waste biomass is washed, and then the waste biomass is dried after impurities are removed. Subsequently, 10g of bamboo chips was weighed out, and an activator (K) was added in a mass ratio of 40%2C2O4) Mechanically mixing, putting in a tubular furnace at 750 ℃ together for high-temperature pyrolysis, cooling, washing with hydrochloric acid and deionized water for several times, and drying to obtain the porous biochar material. The specific surface was found to be 321m2/g。
Preparing 100g/L urea solution to simulate nitrogen water pollutants, and adding the porous biochar material into the urea solution according to the addition ratio of 5g/L for adsorption. Wherein the adsorption temperature is 25 ℃, the adsorption time is 24h, and the adsorption material is obtained.
And then, transferring the adsorbing material into a crucible with a plug, covering quartz sand for filling, then placing the adsorbing material and the quartz sand together into an inert atmosphere tube furnace for curing heat treatment, and removing the quartz sand after cooling to obtain a finished product. Wherein the curing heat treatment temperature is 750 ℃, and the curing heat treatment time is 2 hours. Elemental analysis and x-ray photoelectron spectroscopy test analysis show that the nitrogen loading of the doping material is 2.08 wt%, which is improved by 46% compared with unadsorbed porous biochar.
Mixing the nitrogen adsorption doping material, acetylene black and polyvinylidene fluoride according to the mass ratio of 8: 1: 1, preparing a working electrode, forming a three-electrode testing system by the working electrode, a platinum electrode and a calomel electrode, and testing the cyclic voltammetry characteristic and the constant current charge-discharge characteristic of the working electrode by using an electrochemical workstation by taking 6M potassium hydroxide solution as electrolyte. When the specific capacitance of the electrode is measured to be 220F/g at 1A/g, the specific capacitance of the undoped porous biochar is 181F/g, and the performance is improved by 21.8 percent.
The biggest difference between the third embodiment and the second embodiment is that the curing heat treatment temperature is increased, and the results show that the beneficial effects are improved.
Example four:
bamboo sawdust is used as waste biomass, the surface of the waste biomass is washed, and then the waste biomass is dried after impurities are removed. Subsequently, 10g of bamboo chips was weighed out, and an activator (K) was added in a mass ratio of 40%2C2O4) Mechanically mixing, putting in a tubular furnace at 750 ℃ together for high-temperature pyrolysis, cooling, washing with hydrochloric acid and deionized water for several times, and drying to obtain the porous biochar material. The specific surface was found to be 321m2/g。
Preparing 10g/L potassium phosphate solution to simulate phosphorus water pollutants, and adding the porous biochar material into the potassium phosphate solution according to the addition ratio of 25g/L for adsorption. Wherein the adsorption temperature is 35 ℃, and the adsorption time is 24 hours, so as to obtain the adsorption material.
And then, transferring the adsorbing material into a crucible with a plug, covering quartz sand for filling, then placing the adsorbing material and the quartz sand together into an inert atmosphere tube furnace for curing heat treatment, and removing the quartz sand after cooling to obtain a finished product. Wherein the curing heat treatment temperature is 750 ℃, and the curing heat treatment time is 2 hours. Elemental analysis and x-ray photoelectron spectroscopy test analysis show that the nitrogen loading of the doping material is 1.08 wt%, which is 21% higher than that of unadsorbed porous biochar.
And (2) mixing the phosphorus adsorption doping material, acetylene black and polyvinylidene fluoride according to the mass ratio of 8: 1: 1, preparing a working electrode, forming a three-electrode testing system by the working electrode, a platinum electrode and a calomel electrode, and testing the cyclic voltammetry characteristic and the constant current charge-discharge characteristic of the working electrode by using an electrochemical workstation by taking 6M potassium hydroxide solution as electrolyte. When the specific capacitance of the electrode is measured to be 201F/g at 1A/g, the specific capacitance of the undoped porous biochar is 181F/g, and the performance is improved by 11.0 percent.
The biggest difference between the fourth embodiment and the third embodiment is that the phosphorus water body pollutant is adopted.
Example five:
peanut shells are used as waste biomass, the surfaces of the peanut shells are washed firstly, and then the peanut shells are dried after impurities are removed. Subsequently, 10g of peanut shell was weighed out, in a mass ratio to 30% of an activator (NaHCO)3) Mechanically mixing, putting in a tubular furnace at 750 ℃ together for high-temperature pyrolysis, cooling, washing with hydrochloric acid and deionized water for several times, and drying to obtain the porous biochar material. Measured to have a specific surface area of 402m2/g。
Preparing 10g/L urea solution and 10g/L potassium phosphate solution to simulate nitrogen and phosphorus water pollutants, and adding the porous biochar material into the urea and potassium phosphate mixed solution according to the addition ratio of 1g/L for adsorption. Wherein the adsorption temperature is 15 ℃, and the adsorption time is 48h, thus obtaining the adsorption material.
And then, transferring the adsorbing material into a crucible with a plug, covering quartz sand for filling, then placing the adsorbing material and the quartz sand together into an inert atmosphere tube furnace for curing heat treatment, and removing the quartz sand after cooling to obtain a finished product. Wherein the curing heat treatment temperature is 800 ℃, and the curing heat treatment time is 1 h. The element analysis and the x-ray photoelectron spectroscopy test analysis show that the nitrogen loading capacity of the doping material is 1.52 wt%, 13% higher than that of unadsorbed porous biochar, and the phosphorus loading capacity is 0.95 wt%, and 10.8% higher than that of unadsorbed porous biochar.
And (2) adsorbing the doping material with the nitrogen and the phosphorus, and mixing acetylene black and polyvinylidene fluoride according to a mass ratio of 8: 1: 1, preparing a working electrode, forming a three-electrode testing system by the working electrode, a platinum electrode and a calomel electrode, and testing the cyclic voltammetry characteristic and the constant current charge-discharge characteristic of the working electrode by using an electrochemical workstation by taking 6M potassium hydroxide solution as electrolyte. When the specific capacitance of the electrode is measured to be 236F/g at 1A/g, the specific capacitance of the undoped porous biochar is 192F/g, and the performance is improved by 22.9 percent.
The biggest difference between example five and examples one to four is that nitrogen and phosphorus water pollutants are used.
The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.

Claims (10)

1. A preparation method of a nitrogen and/or phosphorus adsorption doping material is characterized by comprising the following steps:
a) pyrolysis: uniformly mixing the waste biomass with a low proportion of activating agent, performing high-temperature pyrolysis in an inert atmosphere, and removing the activating agent to obtain a porous biochar material;
b) adsorption: mixing the porous biochar material with nitrogen and/or phosphorus water body pollutants by taking the porous biochar material prepared in the step a) as a matrix and taking the nitrogen and/or phosphorus water body pollutants as an external nitrogen and/or phosphorus source, so that the porous biochar material adsorbs nitrogen and/or phosphorus in the nitrogen and/or phosphorus water body pollutants to obtain an adsorbing material;
c) thermal curing: sealing the adsorbing material prepared in the step b) and carrying out curing heat treatment in an inert atmosphere to obtain a finished product.
2. The method for preparing nitrogen and/or phosphorus adsorbing and doping material according to claim 1, wherein the method comprises the following steps: in step a), the mixing ratio of the activating agent to the waste biomass is not higher than 40 percent by mass, and the activating agent is KOH or ZnCl2、NaHCO3、Na2CO3Or KHCO3One or more of the compositions, the modes for removing the activating agent are acid washing and water washing, and the specific surface area of the porous biochar material is not less than 50m2The pyrolysis temperature is 450-750 ℃.
3. The method for preparing nitrogen and/or phosphorus adsorbing and doping material according to claim 1, wherein the method comprises the following steps: in the step b), the nitrogen content concentration, the phosphorus content concentration or the combined total concentration of nitrogen and phosphorus of the nitrogen and/or phosphorus water body pollutants is 0.1-100 g/L.
4. The method for preparing nitrogen and/or phosphorus adsorbing and doping material according to claim 3, wherein the method comprises the following steps: the nitrogen and/or phosphorus water body pollutant is an organic or inorganic liquid phase pollutant containing nitrogen and/or phosphorus elements.
5. The method for preparing nitrogen and/or phosphorus adsorbing and doping material according to claim 4, wherein the method comprises the following steps: the organic liquid phase pollutant containing nitrogen and/or phosphorus elements is eutrophic water, and the inorganic liquid phase pollutant containing nitrogen and/or phosphorus elements is domestic sewage or chemical wastewater containing one or a combination of ammonium salt, nitrite, urea, aniline, phosphoric acid and phosphate.
6. The method for preparing nitrogen and/or phosphorus adsorbing and doping material according to claim 1, wherein the method comprises the following steps: in the step b), the adding proportion of the porous biochar material to nitrogen and/or phosphorus water pollutants is 1-25 g/L, the adsorption temperature is 15-35 ℃, and the adsorption time is 2-48 h.
7. The method for preparing nitrogen and/or phosphorus adsorbing and doping material according to claim 1, wherein the method comprises the following steps: in the step c), the sealing is specifically to place the adsorbing material in a closed cavity and cover the inert filler on the upper surface of the adsorbing material, the curing heat treatment temperature is 200-1000 ℃, and the curing heat treatment time is 0.5-5 h.
8. The method for preparing nitrogen and/or phosphorus adsorbing and doping material according to claim 7, wherein the method comprises the following steps: the effective volume of the closed cavity is not higher than 105% of the stacking volume of the adsorption material after compaction, and the total filling volume of the inert filler and the adsorption material is not lower than 99.5% of the effective volume of the closed cavity.
9. A nitrogen and/or phosphorus adsorbing and doping material prepared by the preparation method of any one of claims 1 to 8, wherein: the surface contains active nitrogen groups and/or active phosphorus groups, and if nitrogen is contained, the nitrogen loading is 0.2-8 wt.%, and if phosphorus is contained, the phosphorus loading is 0.4-10 wt.%.
10. Use of the nitrogen and/or phosphorus adsorbing and doping material of claim 9 in the field of electrical energy storage.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107601502A (en) * 2017-10-19 2018-01-19 天津工业大学 The preparation and the application in terms of capacitive property of a kind of nitrogen phosphorus doping porous charcoal
CN108529621A (en) * 2018-05-14 2018-09-14 桂林电子科技大学 A kind of preparation and its application of nitrogen-doped porous carbon material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107601502A (en) * 2017-10-19 2018-01-19 天津工业大学 The preparation and the application in terms of capacitive property of a kind of nitrogen phosphorus doping porous charcoal
CN108529621A (en) * 2018-05-14 2018-09-14 桂林电子科技大学 A kind of preparation and its application of nitrogen-doped porous carbon material

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