CN115282725A - Composite nano material for air purification and preparation method thereof - Google Patents

Composite nano material for air purification and preparation method thereof Download PDF

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CN115282725A
CN115282725A CN202211057110.2A CN202211057110A CN115282725A CN 115282725 A CN115282725 A CN 115282725A CN 202211057110 A CN202211057110 A CN 202211057110A CN 115282725 A CN115282725 A CN 115282725A
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graphene oxide
stirring
nano
carbon aerogel
air purification
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杨红军
马春印
崔倩
孙景宽
夏江宝
邵鹏帅
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Binzhou University
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Binzhou University
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Abstract

The invention provides a composite nano material for air purification and a preparation method thereof, belonging to the field of nano material preparation and application. The composite nano material is prepared from 15-55 parts by weight of graphene oxide, 30-50 parts by weight of carbon aerogel, 5-10 parts by weight of nano TiO2 and 1-3 parts by weight of nano silver particles, wherein the carbon aerogel, the nano TiO2 and the nano silver particles are loaded on the surface of a graphene oxide nano sheet; the combination of the graphene oxide and the carbon aerogel enriches the pore structure and the surface functional group property of the material, and the material can be used for formaldehyde and other materials such as: benzene, toluene, ammonia and other organic pollutants also show good adsorption selectivity.

Description

Composite nano material for air purification and preparation method thereof
Technical Field
The invention belongs to the field of preparation and application of nano materials, and particularly relates to a composite nano material for air purification and a preparation method thereof.
Background
Formaldehyde is a major indoor air pollutant, and the harm of formaldehyde is widely concerned by people. The Chinese 'indoor air quality standard' (GB/T18883-2002) issued in 2002 stipulates that the hygiene standard (maximum allowable concentration) of formaldehyde in indoor air is 0.10mg/m 3 . Therefore, the removal of formaldehyde from indoor air is of great significance. The purification methods for formaldehyde at present can be roughly classified into adsorption, chemical reaction, plasma technology, photocatalytic method and catalytic method, wherein the catalytic method is a long-lasting method. US patent US 5585083 invented a Pt/SnO 2 Method for removing formaldehyde in air by using catalyst, and catalystThe agent completely oxidizes the formaldehyde into carbon dioxide and water by using oxygen in the air as an oxidant under the conditions of no additional energy input and-5-25 ℃. However, the high Pt content (12 parts by weight) of the catalyst leads to an expensive catalyst. Chinese patent CN1698932 uses rare earth oxide or metal composite oxide catalyst loaded with gold to obtain better effect on formaldehyde at 80-100 ℃.
The research on the nano material is a leading field in the scientific research nowadays and is also a hot spot of research of many scientific workers all over the world. The curiosity and the aspects which are not known by people of the nanometer material draw extensive attention of people; the research and application of the preparation of the nano material are more hot and difficult points at present and are also the key points for developing high technology.
The nano antibacterial material has wide market due to the advantages of high antibacterial efficiency, good stability, no toxicity, no odor, broad spectrum and the like. The commonly used nano antibacterial material is mainly loaded with Ag (Ag) 2 0) And Cu0 or Zn0 series of inorganic matters have strong silver antibacterial capacity, have good effects on gram positive bacteria, gram negative bacteria, mould and yeast, have good safety and do not generate toxic action on human bodies, so the current commercialized antibacterial agent is mainly a silver antibacterial material and is widely applied to related products such as coatings, plastics, rubber, fabrics and the like. For example, the aluminum sheet CN101187018A is loaded with metal silver and has a regular structure; CN1857309A uses silver powder to make spraying agent for women, which has good effect on various bacteria and fungi; US20090130181 uses UV to treat Ag + The metal Ag is reduced in situ on various natural and synthetic materials, and the antibacterial material has high-efficiency and long-acting antibacterial performance and the like.
The invention is based on the prior art, and aims to provide an air purification nano material capable of effectively adsorbing formaldehyde in air and killing bacteria in air, which is prepared by mixing carbon aerogel and nano TiO 2 And loading nano silver particles on the surface of the graphene oxide nanosheet.
Disclosure of Invention
In order to overcome the technical defects that the treatment effect of an air purification method aiming at formaldehyde is poor and the treatment cost of a catalytic method is high in the prior art, the invention provides a composite nano material for air purification, wherein the composite nano material is prepared from 15-55 parts by weight of graphene oxide, 30-50 parts by weight of carbon aerogel, 5-10 parts by weight of nano TiO2 and 1-3 parts by weight of nano silver particles, and the carbon aerogel, the nano TiO2 and the nano silver particles are loaded on the surface of a graphene oxide nanosheet; the combination of the graphene oxide and the carbon aerogel enriches the pore structure and the surface functional group property of the material, and the material can be used for formaldehyde and other materials such as: benzene, toluene, ammonia and other organic pollutants also show good adsorption selectivity.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a composite nano material for air purification is prepared from (by weight parts) graphene oxide nanosheets 15-55, carbon aerogel 30-50, and nano TiO 5-10 2 And 1-3 parts by weight of nano silver particles, wherein the carbon aerogel and the nano TiO are 2 And the nano silver particles are loaded on the surface of the graphene oxide nanosheet.
Preferably, the thickness of the graphene oxide nanosheet is 4-12nm, and the particle size of the nano silver particles is 20-50nm.
Preferably, the specific surface area of the prepared composite nano material is 900-1200m 2 Per g, pore volume of 0.3-0.5cm 3 /g。
The invention also provides a preparation method of the composite nano material for air purification, which comprises the following steps:
(1) Preparing graphene oxide nanosheets: graphite powder is dispersed into concentrated sulfuric acid under ice bath at 0 ℃, and KMnO is added under stirring 4 Raising the temperature to 30-35 ℃ after fully stirring, adding deionized water, and adding H with the mass concentration of 30% after fully stirring 2 O 2 After fully stirring, centrifugal separationRepeatedly washing the graphite oxide nano-sheets by using HCl solution with the mass concentration of 5%, deionized water and acetone to obtain graphite oxide nano-sheets; placing the obtained graphite oxide nano-sheet in a flask, adding a solvent into the flask, placing the flask in an ultrasonic cleaning machine for ultrasonic treatment, and removing the solvent;
(2) Preparing graphene oxide nanosheet/carbon aerogel: adding a carbon source into an absolute ethyl alcohol/water mixed solvent to form a uniform and stable solution, adding the prepared graphene oxide nanosheet, stirring at room temperature for 1-2 hours to obtain a mixed solution, filtering, washing and drying the mixed solution, and roasting at 400-500 ℃ for 4-12 hours under an inert atmosphere to obtain a graphene oxide nanosheet/carbon aerogel material;
(3) Graphene oxide/carbon aerogel/nano TiO 2 Preparation of Ag nanoparticles: agN0 3 Dissolving in absolute ethyl alcohol to obtain AgN0 3 Adding ethyl acetate, tetrabutyl titanate and glacial acetic acid into the ethanol solution, and stirring for 8-12min to obtain a uniformly mixed solution; adding the graphene oxide/carbon aerogel material prepared in the step (2) into the mixed solution, stirring for 30-60min, transferring into a reaction kettle with a polytetrafluoroethylene substrate, and reacting at 120-160 ℃ for 12-24h to obtain a solid product; and washing, drying and roasting the solid product to obtain the composite nano material.
Preferably, the solvent in step (1) is one or more of ethanol, methanol, isopropanol or tetrahydrofuran. KMnO added in the step (1) 4 The mass of the graphite powder is 3-4 times of that of the graphite powder.
Preferably, the volume ratio of the absolute ethyl alcohol to the water in the absolute ethyl alcohol/water mixed solvent is 2:1.
preferably, the washing in the step (3) is washing by using absolute ethyl alcohol, the drying condition is drying at 80-100 ℃ for 12-24h, and the roasting condition is roasting at 500-600 ℃ for 2-4h.
Preferably, the preparation method of the composite nanomaterial for air purification comprises the following steps:
(1) Preparing graphene oxide nanosheets: dispersing 0.015-0.072g of graphite powder into 20-25mL of concentrated sulfuric acid at 0 ℃ in ice bath, adding the graphite powder into the concentrated sulfuric acid under stirringInto KMnO 4 Stirring for 30-60min, heating to 30-35 deg.C, adding 40-50ml deionized water, stirring for 20-30 min, adding 10-15ml H with mass concentration of 30% 2 O 2 Stirring for 5-20 minutes, performing centrifugal separation, and repeatedly washing with HCl solution with the mass concentration of 5%, deionized water and acetone to obtain graphite oxide nanosheets; then placing the obtained graphite oxide product into a 250mL flask, adding 150mL of solvent, placing the flask into a 120Hz ultrasonic cleaning machine for ultrasonic treatment for 1h, and removing the solvent;
(2) Preparing graphene oxide nanosheet/carbon aerogel: adding 10-15g of carbon source into 50-80mL of absolute ethyl alcohol/water mixed solvent to form a uniform and stable solution, then adding 10-20g of graphene oxide nanosheets obtained in the step (1) into the solution, stirring for 1-2 hours at room temperature to obtain a mixed solution, then filtering, washing and drying the product, and roasting at 400-500 ℃ for 4-12 hours under an inert atmosphere to obtain a graphene oxide nanosheet/carbon aerogel material;
(3) Graphene oxide/carbon aerogel/nano TiO 2 Preparation of Ag nanoparticles: firstly, 0.2-2g of AgN03 is dissolved in 20-30ml of absolute ethyl alcohol to obtain transparent AgN0 3 Ethanol solution, then adding to the prepared AgN0 3 Adding ethyl acetate, 1.5-4 g tetrabutyl titanate and glacial acetic acid into the ethanol solution, and stirring for 8-12min to obtain a uniformly mixed solution; then adding 5-15g of the graphene oxide/carbon aerogel material prepared in the step (2) into the prepared mixed solution, stirring for 30-60min, then putting the mixture into a reaction kettle with a polytetrafluoroethylene substrate, and reacting for 12-24h at 120-160 ℃ to obtain a solid product; and finally, washing, drying and roasting the solid product to obtain the composite nano material.
The preparation method realizes the controllable synthesis of the composite material, the surface property of the synthesized material is very excellent, the thickness of the nano sheet is 4-12nm, the particle size of the nano silver particles is 20-50nm, and the specific surface area of the material is 900-1200m 2 Per g, pore volume of 0.3-0.5cm 3 The air purifying material has the functions of adsorption, oxidation, purification and sterilization by utilizing the nanometer size effect generated by the nanometer interlayer structure and the nanometer particle sizeEnergy is saved; the specific surface area of the material is very large, more adsorption sites are provided for the adsorption of formaldehyde, the combination of the graphene oxide and the carbon aerogel enriches the pore structure and the surface functional group property of the material, and the material not only can adsorb formaldehyde, but also can adsorb other substances such as: benzene, toluene, ammonia and other organic pollutants also show good adsorption selectivity; in addition, tiO 2 And Ag nano particles are uniformly dispersed on the surface of the graphene oxide nanosheet, the titanium dioxide can generate hydroxyl radicals and release negative ions on the surface through photocatalytic reaction under the illumination condition, the strong oxidizing property of the hydroxyl radicals can effectively decompose bacteria, the bacteria can be prevented from being sterilized together with the nano silver particles, and the problem of single TiO is solved 2 Or insufficient performance of a single Ag as a bactericidal active.
Based on the composite nano material, the invention also provides the application of the composite nano material in air purification. The composite nano material of the invention mainly realizes the air purification effect by the following methods, one of which can remove formaldehyde in the air, not only formaldehyde, but also other formaldehyde: benzene, toluene, ammonia and other organic pollutants also show good adsorption selectivity. Secondly, the composite material can inhibit and kill various bacteria.
Compared with the prior art, the invention has the following beneficial technical effects:
(1) The invention realizes the controllable synthesis of the composite material, the surface property of the synthesized material is excellent, and the composite material utilizes the nanometer size effect generated by the nanometer interlayer structure and the nanometer particle size to ensure that the air purification material has the functions of adsorption, oxidation purification and sterilization; the specific surface area of the material is very large, more adsorption sites are provided for the adsorption of formaldehyde, the combination of the graphene oxide and the carbon aerogel enriches the pore structure and the surface functional group property of the material, and the material not only can adsorb formaldehyde, but also can adsorb other substances such as: benzene, toluene, ammonia and other organic pollutants also show good adsorption selectivity.
(2) TiO in the composite material of the invention 2 And Ag nano particles are uniformly dispersed on the surface of the graphene oxide nano sheet, and hydrogen can be generated on the surface of titanium dioxide through photocatalytic reaction under the illumination conditionOxygen free radical and release negative ion, the strong oxidizing property of the oxygen free radical can effectively decompose bacteria, and the oxygen free radical and the nano silver particles play the role of antibiosis and sterilization together, thereby overcoming the defect of single TiO 2 Or insufficient performance of Ag alone as a germicidal active agent.
(3) The method has the advantages of simple process, low cost, short period, environmental friendliness and the like, and can be suitable for industrial large-scale production.
Drawings
FIG. 1 is an SEM photograph of a composite nanomaterial of example 1 of the present invention.
Detailed Description
The invention is further described below by means of specific examples, which do not limit the scope of the patent protection of the invention in any way.
Example 1A composite nanomaterial for air purification and method for preparing the same
A composite nano material for air purification is prepared from 15 parts by weight of graphene oxide nanosheets, 30 parts by weight of carbon aerogel and 5 parts by weight of nano TiO 2 And 1 part by weight of nano silver particles, wherein the carbon aerogel and the nano TiO 2 And the nano silver particles are loaded on the surface of the graphene oxide nanosheet.
The preparation method of the composite nano material for air purification comprises the following steps:
(1) Preparing graphene oxide nanosheets: 0.015g of graphite powder is dispersed into 20mL of concentrated sulfuric acid under the condition of ice bath at the temperature of 0 ℃, and KMnO is added under the stirring condition 4 Stirring for 30 minutes, raising the temperature to 30 ℃, adding 40ml of deionized water, stirring for 20-minutes, adding 10ml of H with the mass concentration of 30 percent 2 O 2 Stirring for 5 minutes, performing centrifugal separation, and repeatedly washing with an HCl solution with the mass concentration of 5%, deionized water and acetone to obtain graphite oxide nanosheets; then placing the obtained graphite oxide product into a 250mL flask, adding 150mL of solvent, placing the flask into a 120Hz ultrasonic cleaning machine for ultrasonic treatment for 1h, and removing the solvent;
(2) Preparing graphene oxide nanosheet/carbon aerogel: adding 10g of carbon source into 50mL of absolute ethyl alcohol/water mixed solvent to form a uniform and stable solution, then adding 10g of graphene oxide nanosheets obtained in the step (1) into the solution, stirring for 1h at room temperature to obtain a mixed solution, filtering, washing and drying the product, and roasting at 400 ℃ for 4 hours under an inert atmosphere to obtain a graphene oxide nanosheet/carbon aerogel material;
(3) Graphene oxide/carbon aerogel/nano TiO 2 Preparation of Ag nanoparticles: firstly, 0.2gAgN0 3 Dissolving in 20ml of absolute ethyl alcohol to obtain transparent AgN0 3 Ethanol solution, then to the prepared AgN0 3 Adding ethyl acetate, 1.5g of tetrabutyl titanate and glacial acetic acid into the ethanol solution, and stirring for 8min to obtain a uniformly mixed solution; adding 5g of the graphene oxide/carbon aerogel material prepared in the step (2) into the prepared mixed solution, stirring for 30min, then putting the mixture into a reaction kettle with a polytetrafluoroethylene substrate, and reacting for 12h at 120 ℃ to obtain a solid product; and finally, washing, drying and roasting the solid product to obtain the composite nano material.
Example 2 a composite nanomaterial for air purification and method of preparing the same
A composite nano material for air purification is prepared from 55 parts by weight of graphene oxide nanosheets, 50 parts by weight of carbon aerogel and 10 parts by weight of nano TiO 2 And 3 parts by weight of nano silver particles, wherein the carbon aerogel and the nano TiO 2 And the nano silver particles are loaded on the surface of the graphene oxide nanosheet.
The preparation method of the composite nano material for air purification comprises the following steps:
(1) Preparing graphene oxide nanosheets: dispersing 0.072g of graphite powder into 25mL of concentrated sulfuric acid at 0 ℃ in an ice bath, adding KMnO under stirring 4 Stirring for 60 minutes, raising the temperature to 35 ℃, adding 50ml of deionized water, stirring for 20-30 minutes, adding 15ml of H with the mass concentration of 30% 2 O 2 Stirring for 20 minutes, performing centrifugal separation, and repeatedly washing with an HCl solution with the mass concentration of 5%, deionized water and acetone to obtain graphite oxide nanosheets; then will bePlacing the obtained graphite oxide product in a 250mL flask, adding 150mL of solvent, placing the flask in a 120Hz ultrasonic cleaning machine for ultrasonic treatment for 1h, and removing the solvent;
(2) Preparing graphene oxide nanosheet/carbon aerogel: adding 15g of carbon source into 80mL of absolute ethyl alcohol/water mixed solvent to form a uniform and stable solution, then adding 20g of graphene oxide nanosheets obtained in the step (1) into the solution, stirring for 2h at room temperature to obtain a mixed solution, filtering, washing and drying the product, and roasting at 500 ℃ for 12h under an inert atmosphere to obtain a graphene oxide nanosheet/carbon aerogel material;
(3) Graphene oxide/carbon aerogel/nano TiO 2 Preparation of Ag nanoparticles: firstly, 2g of AgN03 is dissolved in 30ml of absolute ethyl alcohol to obtain transparent AgN0 3 Ethanol solution, then to the prepared AgN0 3 Adding ethyl acetate, 1.5-4 g tetrabutyl titanate and glacial acetic acid into the ethanol solution, and stirring for 12min to obtain a uniformly mixed solution; adding 15g of the graphene oxide/carbon aerogel material prepared in the step (2) into the prepared mixed solution, stirring for 60min, then putting the mixture into a reaction kettle with a polytetrafluoroethylene substrate, and reacting for 24h at 160 ℃ to obtain a solid product; and finally, washing, drying and roasting the solid product to obtain the composite nano material.
Example 3A composite nanomaterial for air purification and method of preparing the same
A composite nano material for air purification is prepared from 35 parts by weight of graphene oxide nanosheets, 40 parts by weight of carbon aerogel and 8 parts by weight of nano TiO 2 And 2 parts by weight of nano silver particles, wherein the carbon aerogel and the nano TiO are 2 And the nano silver particles are loaded on the surface of the graphene oxide nanosheet.
The preparation method of the composite nano material for air purification comprises the following steps:
(1) Preparing graphene oxide nanosheets: 0.048g of graphite powder is dispersed in 23mL of concentrated sulfuric acid at 0 ℃ in an ice bath, and KMnO is added with stirring 4 Stirring for 45min, raising the temperature to 33 ℃, and adding 45ml to removeStirring the mixture for 25 minutes, adding 13ml of H with the mass concentration of 30 percent 2 O 2 Stirring for 14 minutes, performing centrifugal separation, and repeatedly washing with an HCl solution with the mass concentration of 5%, deionized water and acetone to obtain graphite oxide nanosheets; then placing the obtained graphite oxide product into a 250mL flask, adding 150mL of solvent, placing the flask into a 120Hz ultrasonic cleaning machine for ultrasonic treatment for 1h, and removing the solvent;
(2) Preparing graphene oxide nanosheet/carbon aerogel: adding 13g of carbon source into 70mL of absolute ethyl alcohol/water mixed solvent to form a uniform and stable solution, then adding 15g of graphene oxide nanosheets obtained in the step (1) into the solution, stirring for 1.5 hours at room temperature to obtain a mixed solution, filtering, washing and drying the product, and roasting at 450 ℃ for 8 hours under an inert atmosphere to obtain a graphene oxide nanosheet/carbon aerogel material;
(3) Graphene oxide/carbon aerogel/nano TiO 2 Preparation of Ag nanoparticles: first, 1.1gAgN03 was dissolved in 25ml of absolute ethanol to obtain transparent AgN0 3 Ethanol solution, then to the prepared AgN0 3 Adding ethyl acetate, 2.3g of tetrabutyl titanate and glacial acetic acid into the ethanol solution, and stirring for 10min to obtain a uniformly mixed solution; then adding 10g of the graphene oxide/carbon aerogel material prepared in the step (2) into the prepared mixed solution, stirring for 45min, then putting the mixed solution into a reaction kettle with a polytetrafluoroethylene substrate, and reacting for 18h at 140 ℃ to obtain a solid product; and finally, washing, drying and roasting the solid product to obtain the composite nano material.

Claims (10)

1. A composite nano material for air purification is prepared from 15-55 parts by weight of graphene oxide nanosheets, 30-50 parts by weight of carbon aerogel and 5-10 parts by weight of nano TiO 2 And 1-3 parts by weight of nano silver particles, wherein the carbon aerogel and the nano TiO are 2 And the nano silver particles are loaded on the surface of the graphene oxide nanosheet.
2. The composite nanomaterial for air purification according to claim 1, wherein the graphene oxide nanosheets have a thickness of 4-12nm and the nanosilver particles have a particle size of 20-50nm.
3. The composite nanomaterial for air purification of claim 1, wherein the specific surface area of the prepared composite nanomaterial is 900-1200m 2 Per g, pore volume of 0.3-0.5cm 3 /g。
4. A method for preparing the composite nanomaterial for air purification of claim 1, comprising the steps of:
(1) Preparing graphene oxide nanosheets: dispersing graphite powder into concentrated sulfuric acid at 0 ℃ in an ice bath, and adding KMnO under stirring 4 Raising the temperature to 30-35 ℃ after fully stirring, adding deionized water, adding H with the mass concentration of 30% after fully stirring 2 O 2 After fully stirring, centrifugally separating, and repeatedly washing by using an HCl solution with the mass concentration of 5%, deionized water and acetone to obtain graphite oxide nanosheets; placing the obtained graphite oxide nano-sheet in a flask, adding a solvent into the flask, placing the flask in an ultrasonic cleaning machine for ultrasonic treatment, and removing the solvent;
(2) Preparing graphene oxide nanosheet/carbon aerogel: adding a carbon source into an absolute ethyl alcohol/water mixed solvent to form a uniform and stable solution, adding the prepared graphene oxide nanosheet, stirring at room temperature for 1-2 hours to obtain a mixed solution, filtering, washing and drying the mixed solution, and roasting at 400-500 ℃ for 4-12 hours under an inert atmosphere to obtain a graphene oxide nanosheet/carbon aerogel material;
(3) Graphene oxide/carbon aerogel/nano TiO 2 Preparation of Ag nanoparticles: agN0 3 Dissolving in absolute ethyl alcohol to obtain AgN0 3 Adding ethyl acetate, tetrabutyl titanate and glacial acetic acid into the ethanol solution, and stirring for 8-12min to obtain a uniformly mixed solution; then adding the graphene oxide/carbon aerogel material prepared in the step (2) into the mixed solution, stirring for 30-60min, transferring into a reaction kettle with a polytetrafluoroethylene substrate,reacting for 12-24h at 120-160 ℃ to obtain a solid product; and washing, drying and roasting the solid product to obtain the composite nano material.
5. The method for preparing the composite nano-material for air purification according to claim 4, wherein the solvent in the step (1) is one or more of ethanol, methanol, isopropanol or tetrahydrofuran, and KMnO is added in the step (1) 4 The mass of the graphite powder is 3-4 times of that of the graphite powder.
6. The method for preparing the composite nanomaterial for air purification of claim 4, wherein a volume ratio of the absolute ethyl alcohol to the water in the absolute ethyl alcohol/water mixed solvent is 2:1.
7. the method for preparing the composite nanomaterial for air purification of claim 4, wherein the washing in the step (3) is washing with absolute ethyl alcohol, the drying condition is drying at 80-100 ℃ for 12-24h, and the baking condition is baking at 500-600 ℃ for 2-4h.
8. The method for preparing composite nanomaterial for air purification of claim 4,
(1) Preparing graphene oxide nanosheets: dispersing 0.015-0.072g of graphite powder into 20-25mL of concentrated sulfuric acid at 0 ℃ in an ice bath, adding KMnO under stirring 4 Stirring for 30-60min, heating to 30-35 deg.C, adding 40-50ml deionized water, stirring for 20-30 min, adding 10-15ml H with mass concentration of 30% 2 O 2 Stirring for 5-20 minutes, performing centrifugal separation, and repeatedly washing with HCl solution with the mass concentration of 5%, deionized water and acetone to obtain graphite oxide nanosheets; then placing the obtained graphite oxide product into a 250mL flask, adding 150mL of solvent, placing the flask into a 120Hz ultrasonic cleaning machine for ultrasonic treatment for 1h, and removing the solvent;
(2) Preparing graphene oxide nanosheet/carbon aerogel: adding 10-15g of carbon source into 50-80mL of absolute ethyl alcohol/water mixed solvent to form a uniform and stable solution, then adding 10-20g of graphene oxide nanosheets obtained in the step (1) into the solution, stirring for 1-2 hours at room temperature to obtain a mixed solution, then filtering, washing and drying the product, and roasting at 400-500 ℃ for 4-12 hours under an inert atmosphere to obtain a graphene oxide nanosheet/carbon aerogel material;
(3) Graphene oxide/carbon aerogel/nano TiO 2 Preparation of Ag nanoparticles: firstly, 0.2-2gAgN0 is added 3 Dissolving in 20-30ml of absolute ethanol to obtain transparent AgN0 3 Ethanol solution, then to the prepared AgN0 3 Adding ethyl acetate, 1.5-4 g of tetrabutyl titanate and glacial acetic acid into the ethanol solution, and stirring for 8-12min to obtain a uniformly mixed solution; adding 5-15g of the graphene oxide/carbon aerogel material prepared in the step (2) into the prepared mixed solution, stirring for 30-60min, then putting the mixture into a reaction kettle with a polytetrafluoroethylene substrate, and reacting for 12-24h at 120-160 ℃ to obtain a solid product; and finally, washing, drying and roasting the solid product to obtain the composite nano material.
9. Use of the composite nanomaterial of claims 1-3 in air purification.
10. The use of claim 9, wherein the composite nanomaterial has effects of removing organic pollutants such as formaldehyde in air and inhibiting and killing bacteria.
CN202211057110.2A 2022-08-31 2022-08-31 Composite nano material for air purification and preparation method thereof Pending CN115282725A (en)

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