CN110652962A - Three-dimensional porous graphene/attapulgite composite aerogel and preparation method thereof - Google Patents
Three-dimensional porous graphene/attapulgite composite aerogel and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a three-dimensional porous graphene/attapulgite composite aerogel and a preparation method thereof, wherein a modified Hammers method is used for preparing a graphene oxide dispersion solution; modifying the attapulgite to obtain uniform attapulgite suspension; mixing and stirring the graphene oxide dispersion solution and the attapulgite suspension uniformly; the obtained mixed solution is self-assembled under the condition of low-temperature wet chemical reaction to prepare composite material hydrogel; and washing the composite material hydrogel, and then freeze-drying to prepare the three-dimensional porous graphene/attapulgite composite aerogel. Compared with the prior art, the method has the advantages of simple operation and low cost, and the prepared novel adsorbent has a three-dimensional multi-level pore structure and a large specific surface area, is expected to be applied to treatment of various pollutant wastewater, and also provides technical reference for development of high-performance attapulgite-based adsorbent materials.
Description
Technical Field
The invention relates to a high-performance adsorbent, in particular to a three-dimensional porous graphene/attapulgite composite aerogel with a large-surface-area three-dimensional hierarchical pore structure and a preparation method thereof, which can be used in the field of sewage treatment.
Background
With the social development and the improvement of the industrialization level, water pollution becomes a global problem, and the development of high-performance adsorbents becomes a research hotspot in the field of water treatment. Among them, a method of treating contaminated water, i.e., an adsorption method, is commonly used and widely studied by researchers. Commonly used adsorbents such as activated carbon, zeolite and chitosan tend to have the disadvantages of high price, difficult regeneration, high requirements on temperature and pH, low adsorption efficiency and capacity and the like. In recent years, aerogel becomes a very promising adsorbent material due to the characteristics of a nanometer three-dimensional hierarchical pore channel structure, extremely low density, extremely high porosity, high specific surface area and ultrahigh pore volume rate and high-efficiency encapsulation capacity for guest molecules. In addition, the good mechanical strength of the composite material can fully exert the adsorption performance and the recyclable regeneration performance of the composite material, so that the composite material has great application potential in water treatment.
In recent years, the attapulgite has been widely researched as an adsorbent due to the advantages of high specific surface area, low cost, environmental friendliness and the like, and can be used for removing waste liquid, organic pollutants or heavy metal ions. In addition, the attapulgite contains a plurality of micro channels and a plurality of negatively charged surface sites, and the surface characteristics make the attapulgite easy to be chemically modified and compounded with other materials, thereby further improving the adsorption capacity of the attapulgite. However, the attapulgite has high specific surface area, and is easy to agglomerate to form flocculent aggregates, thereby greatly reducing the adsorption capacity of the attapulgite.
Graphene oxide is a two-dimensional nanomaterial obtained by chemically oxidizing and stripping natural graphite. Compared with other carbon materials, the graphene aerogel is easier to self-assemble into a macroscopic carbon material, has a three-dimensional hierarchical pore structure and higher surface activity, and has attracted extensive attention as an adsorption material. However, it has some disadvantages like other natural aerogels, such as large structural brittleness, poor mechanical properties, structural collapse during adsorption process, and even dissolution in aqueous solution, thereby affecting the adsorption performance.
Under the condition that natural adsorbing materials cannot meet the requirements of human beings, the artificial design of adsorbing materials with excellent assembling performance becomes a necessary way. The attapulgite and graphene aerogel has own unique advantages in respective adsorption fields, but both have own defects when being used as adsorption materials independently. However, at present, studies on composite aerogel formed by self-assembly of attapulgite and graphene have not been reported, for example, chinese patents CN107281982A and CN104056386B disclose a graphite mesh gel foam mud fire prevention and extinguishing agent prepared by mixing a mixture of graphene and clay composite elastic aerogel, attapulgite clay powder, inorganic fiber spray cotton, graphite tailing powder and gangue powder, respectively, and the prior art does not disclose an aerogel product formed by attapulgite and graphene, and the aerogel product is applied to the field of sewage treatment to adsorb heavy metal ions.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a three-dimensional porous graphene/attapulgite composite aerogel capable of effectively promoting adsorption reaction and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
a preparation method of the three-dimensional porous graphene/attapulgite composite aerogel comprises the following steps:
preparing a graphene oxide dispersion solution by using a modified Hammers method;
modifying the attapulgite to obtain uniform attapulgite suspension;
mixing and stirring the graphene oxide dispersion solution and the attapulgite suspension uniformly;
the obtained mixed solution is self-assembled under the condition of low-temperature wet chemical reaction to prepare composite material hydrogel;
and washing the composite material hydrogel, and then freeze-drying to prepare the three-dimensional porous graphene/attapulgite composite aerogel.
Further, the concentration of the graphene oxide dispersion solution is 1-50 mg/mL.
Further, the surface of the attapulgite is modified by hydrochloric acid, sulfuric acid and/or phosphoric acid solution.
Further, the attapulgite is put into hydrochloric acid, sulfuric acid and/or phosphoric acid solution, stirred and centrifugally cleaned, and the upper layer suspension is attapulgite suspension.
Further, the concentration of the attapulgite suspension is 1-100 mg/mL.
Further, the mass ratio of the concave-convex rod turbid liquid to the graphene aqueous solution in the mixed solution is 1: 1-1: 10.
Further, self-assembly is carried out in a reaction kettle or any closed reaction vessel.
Furthermore, the reaction temperature during self-assembly is 80-150 ℃, compared with the reaction temperature of more than 200 ℃ in the prior art, the method belongs to low-temperature reaction, and the chemical reaction is carried out in a solvent, for example, deionized water can be used as the solvent.
Furthermore, the freeze drying temperature is-80 to-60 ℃.
The three-dimensional porous graphene/attapulgite composite aerogel prepared by the method has a high specific surface area and a three-dimensional multi-stage pore channel structure, and the specific surface area is 5-500 m2The diameter of the pore channel is 1-10 μm.
The attapulgite graphene composite adsorbing material is constructed, the coordination effect of two different materials is fully utilized, and the adsorption capacity of the composite material can be effectively improved. The problem of insufficient material strength exists when the graphene oxide is singly used for preparing the aerogel for water treatment, which can cause collapse of the structure of the aerogel in the adsorption process, so that the aerogel is dissolved in water, and the adsorption performance and subsequent recycling of the aerogel are affected. The stability and the mechanical property of the aerogel structure can be improved by introducing the modified attapulgite nanorods for crosslinking. The attapulgite is mutually crosslinked and agglomerated, and the net wall structure of the graphene aerogel can block the mutual agglomeration of the attapulgite nanorods by introducing the attapulgite into the graphene aerogel with a three-dimensional network structure, so that the adsorption performance of the graphene aerogel is effectively improved.
Compared with the prior art, the invention has the characteristics of simple operation and low cost, and has the beneficial effects that:
(1) freeze drying is adopted, the process is simple, and compared with the gel prepared by drying at normal temperature, the prepared gel can better keep the pore structure;
(2) the prepared graphene/attapulgite composite aerogel not only has high attapulgite loading capacity, but also has excellent mechanical properties;
(3) the prepared graphene/attapulgite composite aerogel has a three-dimensional multistage pore structure and a high specific surface area, and the structure can accelerate the diffusion of ions, effectively promote adsorption reaction and play a key role in improving the adsorption performance of the graphene/attapulgite composite aerogel.
The graphene/attapulgite composite aerogel prepared by the invention is expected to be applied to the fields of water treatment, heavy metal ion recovery and the like.
Drawings
Fig. 1 is a photograph and a scanning electron microscope image of the graphene/attapulgite composite aerogel prepared in example 1 of the present invention;
fig. 2 is an X-ray diffraction image and a transmission electron microscope image of the graphene/attapulgite composite aerogel prepared in example 1 of the present invention;
FIG. 3 is a specific surface area and pore size distribution curve corresponding to graphene/attapulgite composite aerogel with different mass ratios of graphene to attapulgite prepared by the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
A preparation method of three-dimensional porous graphene/attapulgite composite aerogel mainly comprises the following steps:
(1) preparing a graphene oxide dispersion solution with the concentration of 1-50 mg/mL by using a modified Hammers method;
(2) modifying the surface of the attapulgite by using a hydrochloric acid, sulfuric acid and/or phosphoric acid solution, placing the attapulgite in the hydrochloric acid, sulfuric acid and/or phosphoric acid solution, stirring and centrifugally cleaning, wherein the upper-layer suspension is an attapulgite suspension with the concentration of 1-100 mg/mL;
(3) mixing and stirring the graphene oxide dispersion solution and the attapulgite turbid liquid uniformly, wherein the mass ratio of the attapulgite turbid liquid to the graphene aqueous solution in the mixed liquid is 1: 1-1: 10;
(4) the obtained mixed solution is self-assembled in a reaction kettle or any closed reaction container, the reaction temperature is controlled to be 80-150 ℃, and chemical reaction is carried out in solvents such as deionized water and the like to prepare composite material hydrogel;
(5) after being washed, the composite material hydrogel is frozen and dried at the temperature of-80 to-60 ℃ to prepare the three-dimensional porous graphene/attapulgite composite aerogel.
The three-dimensional porous graphene/attapulgite composite aerogel prepared by the method has a high specific surface area and a three-dimensional multi-stage pore channel structure, and the specific surface area is 5-500 m2The diameter of the pore channel is 1-10 μm.
The following are more detailed embodiments, and the technical solutions and the technical effects obtained by the present invention will be further described by the following embodiments.
Example 1:
adding 2g of graphite and 1g of sodium nitrate into 46ml of concentrated sulfuric acid, carrying out ice bath and stirring for 30min, gradually adding 6g of potassium permanganate, stirring for 60min until the solution is purple green, then stirring for two hours at 37 ℃, raising the temperature to 90 ℃, slowly adding 92ml of deionized water, continuously stirring by using a glass rod, stirring for 30min, adding 124ml of deionized water, keeping the temperature at about 35 ℃, and adding 30ml of 30% hydrogen peroxide until bubbles are not generated any more, so that the solution becomes yellow. And washing the graphene oxide solution for 3 times by using dilute hydrochloric acid and deionized water to obtain a graphene oxide solution.
Adding 20mg of original attapulgite into 100mL of deionized water, adding 1mol of sulfuric acid, stirring for 24h, centrifuging the cleaning solution for 3 times, and taking out the upper suspension as a modified attapulgite suspension with the concentration of 40 mg/mL.
Mixing the prepared graphene oxide aqueous solution and the attapulgite turbid liquid according to the mass ratio of 1:1, adding a proper amount of deionized water to ensure that the concentration of the graphene oxide is 3-4 mg/ml, mixing and stirring uniformly, then putting into a closed container, placing at 150 ℃, keeping for 1h to obtain the graphene oxide and attapulgite composite hydrogel, washing the gel with deionized water for 3 times, and freeze-drying in a freeze-drying mode at-80 ℃ to obtain the graphene/attapulgite composite aerogel.
Fig. 1(a) and 1(c) are photographs of the prepared graphene/attapulgite composite aerogel, and the graphene oxide/attapulgite composite aerogel obtained in the example has good flexibility. Fig. 1(b) is a scanning electron microscope image of the prepared graphene/attapulgite composite aerogel, and graphene oxide is used as a support body, so that the whole aerogel has a three-dimensional pore structure.
Fig. 2(a) is an X-ray diffraction image of the prepared graphene/attapulgite composite aerogel, from which it can be seen that the chemical composition of the concave-convex rods in the obtained graphene oxide/attapulgite composite aerogel is not changed, and fig. 2(b) is a transmission electron microscope image, from which it can be seen that the obtained graphene oxide/attapulgite composite aerogel provides a large contact surface area, which is beneficial to the migration of heavy metal ions and promotes the adsorption process.
Example 2:
adding 2g of graphite and 1g of sodium nitrate into 46ml of concentrated sulfuric acid, carrying out ice bath and stirring for 30min, gradually adding 6g of potassium permanganate, stirring for 60min until the solution is purple green, then stirring for two hours at 37 ℃, raising the temperature to 100 ℃, slowly adding 92ml of water, continuously stirring by using a glass rod, stirring for 30min, adding 124ml of deionized water, keeping the temperature at about 35 ℃, and adding 30ml of 30% hydrogen peroxide until bubbles are not generated any more, so that the solution becomes yellow. And washing the graphene oxide solution for 3 times by using dilute hydrochloric acid and deionized water to obtain a graphene oxide solution.
Adding 20mg of original attapulgite into 100mL of deionized water, adding 1.5mol of phosphoric acid, stirring for 24h, centrifuging the cleaning solution for 3 times, and taking out the upper suspension as modified attapulgite suspension with the concentration of 40 mg/mL.
Mixing the prepared graphene oxide aqueous solution and the attapulgite turbid liquid according to the mass ratio of 9:1, adding a proper amount of deionized water to ensure that the concentration of the graphene oxide is 3-4 mg/ml, mixing and stirring uniformly, then putting into a closed container, placing at 120 ℃, keeping for 2h to obtain the graphene oxide and attapulgite composite hydrogel, washing the gel with deionized water for 3 times, and freeze-drying in a freeze-drying manner at-70 ℃ to obtain the graphene/attapulgite composite aerogel.
Example 3:
adding 2g of graphite and 1g of sodium nitrate into 46ml of concentrated sulfuric acid, carrying out ice bath and stirring for 30min, gradually adding 6g of potassium permanganate, stirring for 60min until the solution is purple green, then stirring for 2h at 37 ℃, raising the temperature to 95 ℃, slowly adding 92ml of water, continuously stirring by using a glass rod, stirring for 30min, adding 124ml of deionized water, keeping the temperature at about 35 ℃, and adding 30ml of 30% hydrogen peroxide until bubbles are not generated any more, so that the solution becomes yellow. And washing the graphene oxide solution for 3 times by using dilute hydrochloric acid and deionized water to obtain a graphene oxide solution.
Adding 20mg of original attapulgite into 100mL of deionized water, adding 0.4mol of hydrochloric acid, stirring for 24h, centrifuging the cleaning solution for 3 times, and taking out the upper layer suspension as modified attapulgite suspension with the concentration of 40 mg/mL.
Mixing the prepared graphene oxide aqueous solution and the attapulgite turbid liquid according to the mass ratio of 3:1, adding a proper amount of deionized water to ensure that the concentration of the graphene oxide is 3-4 mg/ml, mixing and stirring uniformly, then putting into a closed container, placing at 80 ℃, keeping for 3 hours to obtain the graphene oxide and attapulgite composite hydrogel, washing the gel with deionized water for 3 times, and freeze-drying in a freeze-drying manner at-70 ℃ to obtain the graphene/attapulgite composite aerogel.
Example 4:
adding 2g of graphite and 1g of sodium nitrate into 46ml of concentrated sulfuric acid, carrying out ice bath and stirring for 30min, gradually adding 6g of potassium permanganate, stirring for 60min until the solution is purple green, then stirring for two hours at 37 ℃, raising the temperature to 100 ℃, slowly adding 92ml of water, continuously stirring by using a glass rod, stirring for 30min, adding 124ml of deionized water, keeping the temperature at about 35 ℃, and adding 30ml of 30% hydrogen peroxide until bubbles are not generated any more, so that the solution becomes yellow. And washing the graphene oxide solution for 3 times by using dilute hydrochloric acid and deionized water to obtain a graphene oxide solution with the concentration of 40 mg/mL.
Adding 20mg of original attapulgite into 100ml of deionized water, adding 1.5mol of phosphoric acid, stirring for 24h, centrifuging the cleaning solution for 3 times, and taking out the upper suspension as modified attapulgite suspension.
Mixing the prepared graphene oxide aqueous solution and the attapulgite turbid liquid according to the mass ratio of 2:1, adding a proper amount of deionized water to ensure that the concentration of the graphene oxide is 3-4 mg/ml, mixing and stirring uniformly, then putting into a closed container, placing at 120 ℃, keeping for 2h to obtain the graphene oxide and attapulgite composite hydrogel, washing the gel with deionized water for 3 times, and freeze-drying in a freeze-drying manner at-60 ℃ to obtain the graphene/attapulgite composite aerogel.
Example 5:
adding 2g of graphite and 1g of sodium nitrate into 46ml of concentrated sulfuric acid, carrying out ice bath and stirring for 30min, gradually adding 6g of potassium permanganate, stirring for 60min until the solution is purple green, then stirring for two hours at 37 ℃, raising the temperature to 100 ℃, slowly adding 92ml of water, continuously stirring by using a glass rod, stirring for 30min, adding 124ml of deionized water, keeping the temperature at about 35 ℃, and adding 30ml of 30% hydrogen peroxide until bubbles are not generated any more, so that the solution becomes yellow. And washing the graphene oxide solution for 3 times by using dilute hydrochloric acid and deionized water to obtain a graphene oxide solution.
Adding 20mg of original attapulgite into 100mL of deionized water, adding 1.5mol of phosphoric acid, stirring for 24h, centrifuging the cleaning solution for 3 times, and taking out the upper suspension as modified attapulgite suspension with the concentration of 40 mg/mL.
Mixing the prepared graphene oxide aqueous solution and the attapulgite turbid liquid according to the mass ratio of 4:1, adding a proper amount of deionized water to ensure that the concentration of the graphene oxide is 3-4 mg/ml, mixing and stirring uniformly, then putting into a closed container, placing at 120 ℃, keeping for 2h to obtain the graphene oxide and attapulgite composite hydrogel, washing the gel with deionized water for 3 times, and freeze-drying in a freeze-drying manner at-60 ℃ to obtain the graphene/attapulgite composite aerogel.
Example 6:
adding 2g of graphite and 1g of sodium nitrate into 46ml of concentrated sulfuric acid, carrying out ice bath and stirring for 30min, gradually adding 6g of potassium permanganate, stirring for 60min until the solution is purple green, then stirring for two hours at 37 ℃, raising the temperature to 100 ℃, slowly adding 92ml of water, continuously stirring by using a glass rod, stirring for 30min, adding 124ml of deionized water, keeping the temperature at about 35 ℃, and adding 30ml of 30% hydrogen peroxide until bubbles are not generated any more, so that the solution becomes yellow. And washing the graphene oxide solution for 3 times by using dilute hydrochloric acid and deionized water to obtain a graphene oxide solution.
Adding 5mg of original attapulgite into 100mL of deionized water, adding 1mol of hydrochloric acid, stirring for 24h, centrifuging the cleaning solution for 3 times, and taking out the upper layer suspension as modified attapulgite suspension with the concentration of 1 mg/mL.
Mixing the prepared graphene oxide aqueous solution and the attapulgite turbid liquid according to the mass ratio of 1:1, adding a proper amount of deionized water to ensure that the concentration of the graphene oxide is 3-4 mg/ml, mixing and stirring uniformly, then putting into a closed container, placing at 80 ℃, keeping for 5 hours to obtain the graphene oxide and attapulgite composite hydrogel, washing the gel with deionized water for 3 times, and freeze-drying in a freeze-drying manner at-80 ℃ to obtain the graphene/attapulgite composite aerogel.
Example 7:
adding 2g of graphite and 1g of sodium nitrate into 46ml of concentrated sulfuric acid, carrying out ice bath and stirring for 30min, gradually adding 6g of potassium permanganate, stirring for 60min until the solution is purple green, then stirring for two hours at 37 ℃, raising the temperature to 100 ℃, slowly adding 92ml of water, continuously stirring by using a glass rod, stirring for 30min, adding 124ml of deionized water, keeping the temperature at about 35 ℃, and adding 30ml of 30% hydrogen peroxide until bubbles are not generated any more, so that the solution becomes yellow. And washing the graphene oxide solution for 3 times by using dilute hydrochloric acid and deionized water to obtain a graphene oxide solution.
Adding 100mg of original attapulgite into 100mL of deionized water, adding 1mol of sulfuric acid and hydrochloric acid, stirring for 24h, centrifuging the cleaning solution for 3 times, and taking out the upper layer suspension as modified attapulgite suspension with the concentration of 100 mg/mL.
Mixing the prepared graphene oxide aqueous solution and the attapulgite turbid liquid according to the mass ratio of 1:10, adding a proper amount of deionized water to ensure that the concentration of the graphene oxide is 3-4 mg/ml, mixing and stirring uniformly, then putting into a closed container, placing at 150 ℃, keeping for 3 hours to obtain the graphene oxide and attapulgite composite hydrogel, washing the gel with deionized water for 3 times, and freeze-drying in a freeze-drying manner at-70 ℃ to obtain the graphene/attapulgite composite aerogel.
Fig. 3 shows that a, b, c, and d respectively correspond to the specific surface areas and pore size distribution curves of the graphene/attapulgite composite aerogel prepared in examples 1, 2, 4, and 5, and the results show that the specific surface area of the graphene/attapulgite composite aerogel prepared in example 1 is 41.05m2The specific surface area of the graphene/attapulgite composite aerogel prepared in example 2 is 87.543m2The specific surface area of the graphene/attapulgite composite aerogel prepared in example 3 is 160.297m2The specific surface area of the graphene/attapulgite composite aerogel prepared in example 4 is 284.736m2(ii) in terms of/g. The prepared graphene/attapulgite composite aerogel has high specific surface area and multistage distributionThe prepared graphene/attapulgite composite aerogel is expected to be applied to the fields of water treatment, heavy metal ion recovery and the like due to the pore structure.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A preparation method of a three-dimensional porous graphene/attapulgite composite aerogel is characterized by comprising the following steps:
preparing a graphene oxide dispersion solution by using a modified Hammers method;
modifying the attapulgite to obtain uniform attapulgite suspension;
mixing and stirring the graphene oxide dispersion solution and the attapulgite suspension uniformly;
the obtained mixed solution is self-assembled under the condition of low-temperature wet chemical reaction to prepare composite material hydrogel;
and washing the composite material hydrogel, and then freeze-drying to prepare the three-dimensional porous graphene/attapulgite composite aerogel.
2. The preparation method of the three-dimensional porous graphene/attapulgite composite aerogel according to claim 1, wherein the concentration of the graphene oxide dispersion solution is 1-50 mg/mL.
3. The preparation method of the three-dimensional porous graphene/attapulgite composite aerogel according to claim 1, characterized in that the surface of the attapulgite is modified by hydrochloric acid, sulfuric acid and/or phosphoric acid solution.
4. The preparation method of the three-dimensional porous graphene/attapulgite composite aerogel according to claim 3, characterized in that attapulgite is placed in a hydrochloric acid, sulfuric acid and/or phosphoric acid solution, stirred and centrifugally cleaned, and the upper suspension is an attapulgite suspension.
5. The preparation method of the three-dimensional porous graphene/attapulgite composite aerogel according to claim 1, 3 or 4, wherein the concentration of the attapulgite suspension is 1-100 mg/mL.
6. The preparation method of the three-dimensional porous graphene/attapulgite composite aerogel according to claim 1, wherein the mass ratio of the concave-convex rod suspension to the graphene aqueous solution in the mixed solution is 1: 1-1: 10.
7. The preparation method of the three-dimensional porous graphene/attapulgite composite aerogel according to claim 1, characterized in that the self-assembly is carried out in a reaction kettle or any closed reaction vessel.
8. The preparation method of the three-dimensional porous graphene/attapulgite composite aerogel according to claim 1 or 7, characterized in that the reaction temperature during self-assembly is 80-150 ℃, and the chemical reaction is carried out in a solvent.
9. The preparation method of the three-dimensional porous graphene/attapulgite composite aerogel according to claim 1, wherein the freeze-drying temperature is-80 to-60 ℃.
10. The three-dimensional porous graphene/attapulgite composite aerogel prepared by the method of any one of claims 1 to 9, which has a high specific surface area and a three-dimensional multi-stage pore channel structure, wherein the specific surface area is 5-500 m2The diameter of the pore channel is 1-10 μm.
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| CN111286341A (en) * | 2020-02-17 | 2020-06-16 | 常熟理工学院 | Solidification enhancer and preparation method and application thereof |
| CN112080250A (en) * | 2020-09-14 | 2020-12-15 | 明光市铭垚凹凸棒产业科技有限公司 | Attapulgite-based wave-absorbing material and preparation method thereof |
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| CN113526497A (en) * | 2021-08-11 | 2021-10-22 | 洛阳理工学院 | Preparation method of organic modified vermiculite/graphene composite aerogel |
| CN115490241A (en) * | 2022-09-27 | 2022-12-20 | 大连理工大学 | Preparation method and application of gas hydrate accelerant based on MXene-vermiculite composite aerogel |
| CN115490241B (en) * | 2022-09-27 | 2023-09-19 | 大连理工大学 | Preparation method and application of gas hydrate promoter based on MXene-vermiculite composite aerogel |
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