CN110330749A - Optical-thermal conversion material and preparation method - Google Patents
Optical-thermal conversion material and preparation method Download PDFInfo
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- CN110330749A CN110330749A CN201910489808.3A CN201910489808A CN110330749A CN 110330749 A CN110330749 A CN 110330749A CN 201910489808 A CN201910489808 A CN 201910489808A CN 110330749 A CN110330749 A CN 110330749A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/28—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C08J2201/00—Foams characterised by the foaming process
- C08J2201/04—Foams characterised by the foaming process characterised by the elimination of a liquid or solid component, e.g. precipitation, leaching out, evaporation
- C08J2201/048—Elimination of a frozen liquid phase
- C08J2201/0484—Elimination of a frozen liquid phase the liquid phase being aqueous
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- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
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Abstract
The invention discloses a kind of optical-thermal conversion materials and preparation method thereof.The optical-thermal conversion material includes: aeroge matrix, and the aeroge matrix includes graphene and absorbent polymer, and the absorbent polymer includes how hydrophilic based polyalcohol.The optical-thermal conversion material have many advantages, such as available humidity range can be independently desorbed compared with wide, steam, Vapor adsorption amount it is big.
Description
Technical field
The present invention relates to Material Fields, and in particular, to optical-thermal conversion material and preparation method.
Background technique
With the shortage of global water resources, water reuse technology receives relatively broad concern.Such as membrane distillation, reverse osmosis
Thoroughly, the technologies such as electrodialysis, hyperfiltration, solar energy water evaporation, can be converted to available freshwater resources for unavailable waste water, be solved with this
Certainly shortage of water resources problem.In view of economic cost, without energy consumption solar energy water evaporation more and more attention has been paid to.Although as
The development of desalination technology, the water treatment technology based on seawater have formd system abundant, but most water treatment technologies
It is still to be handled based on the water quality to liquid water, for example, using technologies such as reverse osmosis, electrodialysis, hyperfiltration, by liquid
Seawater is converted into desalination water, or based on technologies such as membrane distillation, solar energy water evaporations, liquid seawater is converted to steam, then coagulate
Become fresh water.Wherein, it is carried out in the technology of sea water desalination using solar energy evaporation seawater, relies on optical-thermal conversion material more, improve
The photothermal conversion efficiency of seawater.
Figure is recycled according to the water between Hai Lu, water content is larger in atmosphere, and the 10% of the reachable global fresh water total amount of the scale of construction.Therefore
Obtaining fresh water using the water vapour in atmosphere also has preferable prospect.The skill of moisture is captured from air currently with solar energy
Art needs to carry out by optical-thermal conversion material, and it is necessary to meet following condition for optical-thermal conversion material: can be from air spontaneously
It absorbs a large amount of steam, there is high absorptivity, in certain height in the main energy collection medium wave band of solar energy (250-2500nm)
Temperature is lower being capable of desorption aqueous vapor, good mechanical performance, excellent photothermal conversion efficiency etc..
However, current optical-thermal conversion material with and preparation method thereof still have much room for improvement.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.
As previously mentioned, it is certain firstly the need of having to obtain the optical-thermal conversion material of desalination water using the water vapour in atmosphere
Moisture pick-up properties.And common hygroscopic materials mainly include silica type, molecular sieve, organic metal framework (MOF) etc. at present, but
The applicable humidity range of above-mentioned hygroscopic material is relatively narrow, and the water of capture is relatively fewer, and circulation energy consumption is big, and the external world is needed to give additionally
Energy be used for steam desorption.One kind can such as be developed can be used in wider humidity range, and be not necessarily to external energy
The material of steam desorption can be realized in supply, will greatly improve the efficiency that fresh water is obtained using water vapour.
In view of this, in the one aspect of the application, proposes a kind of acquisition super absorbent polymer Polymer-supported and exist
Method on three-dimensional grapheme aeroge can be mass produced by simple solution freeze-drying.Three-dimensional graphene
Material not only has complete high-mechanical property skeleton structure, it may have high-specific surface area, it is also preferable with high molecular compatibility.
Meanwhile having good absorption in full spectral region, absorbance can achieve 95% or more, can make full use of solar energy, together
When, three-dimensional grapheme aeroge skeleton can provide porous structure for absorbent polymer, accelerate water vapour absorption rate and
Absorptive capacity.
In one aspect of the invention, the invention proposes a kind of optical-thermal conversion materials.The optical-thermal conversion material includes: gas
Gel-in-matrix, the aeroge matrix include graphene and absorbent polymer, and the absorbent polymer includes more carboxyl polymerizations
Object.The optical-thermal conversion material have many advantages, such as available humidity range can be independently desorbed compared with wide, steam, Vapor adsorption amount it is big.
According to an embodiment of the invention, the absorbent polymer includes polyacrylic acid and its salt, alginic acid, polystyrene sulphur
Acid and its salt.It can further improve the Vapor adsorption amount of the optical-thermal conversion material as a result,.
According to an embodiment of the invention, in the aeroge matrix, the quality of the absorbent polymer and the graphite
The mass ratio of alkene is 0.1-1.5.
According to an embodiment of the invention, the aeroge matrix can absorb the moisture in air in full humidity range.
According to an embodiment of the invention, the aeroge matrix has porous structure, the aperture of the porous structure is 25
~60 microns.
According to an embodiment of the invention, the saturated water adsorptive value of the optical-thermal conversion material can reach 5.05g/g.
According to an embodiment of the invention, absorbance of the optical-thermal conversion material in full spectral region can be higher than 95%.
According to an embodiment of the invention, in 1kW/m2Light intensity irradiation under, the surface temperature of the optical-thermal conversion material can
Greater than 85 degrees Celsius.
In another aspect of this invention, the invention proposes a kind of methods for preparing previously described optical-thermal conversion material.
This method comprises: graphite oxide and absorbent polymer are mixed and are lyophilized to form aeroge matrix precursor；To the airsetting
Matrix body carries out reduction treatment, to form aeroge matrix, and obtains the optical-thermal conversion material.This method is easy to operate, just
In expanding the scale of production, and the optical-thermal conversion material obtained at least one of has at least the following advantages: can with humidity range compared with
It is wide, steam can independently be desorbed, Vapor adsorption amount is big etc..
According to an embodiment of the invention, graphite oxide solution and solution containing the absorbent polymer are mixed
It closes, the concentration of graphite oxide described in mixed solution is 3-7mg/ml, the quality of absorbent polymer described in the mixed solution
Ratio with the graphite oxide quality is 0.05~0.8.It is convenient for forming aerogel precursor body using freeze-drying as a result,.
According to an embodiment of the invention, before carrying out the freeze-drying, to the mixed solution carry out concussion mixing and
Ultrasonic mixing processing.
According to an embodiment of the invention, the frozen dried is lyophilized 30~50 hours under -30~-60 degrees Celsius.
According to an embodiment of the invention, the reduction treatment includes: by the aerogel precursor body and hydrazine hydrate solution
It is placed in closed container, heats 70-100 degrees Celsius, heating time is 4-16 hours.
According to an embodiment of the invention, being carried out after the graphite oxide and the absorbent polymer are mixed
Before freeze-drying, it is added ethanol solution in mixed solution in advance, the volume ratio of the ethanol solution and the mixed solution is 1:
25~1:35.Processability after can further improve mixed solution freeze-drying as a result,.
Detailed description of the invention
Fig. 1 shows the flow diagram according to an embodiment of the invention for preparing photo-thermal conversion method；
Fig. 2 shows the scanning electron microscope diagram of according to embodiments of the present invention 1 optical-thermal conversion material；
Fig. 3 shows the scanning electron microscope diagram of according to embodiments of the present invention 1 optical-thermal conversion material；
Fig. 4 shows the full spectrum light line absorption rate curve of according to embodiments of the present invention 1 optical-thermal conversion material；
Fig. 5 shows the water absorption of according to embodiments of the present invention 1 optical-thermal conversion material under different humidity；
Fig. 6 shows the water absorption test knot of according to embodiments of the present invention 1 optical-thermal conversion material under full humidity range
Fruit；
Fig. 7 is shown according to some embodiments of the invention and the histogram of the saturated water adsorptive value of comparative example；
Fig. 8 shows the digital photograph figure of the optical-thermal conversion material of comparative example 4 according to the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In one aspect of the invention, the invention proposes a kind of optical-thermal conversion materials.The optical-thermal conversion material includes gas
Gel-in-matrix, the aeroge matrix include graphene and absorbent polymer.Wherein, absorbent polymer includes more hydrophilic group polymerizations
Object.The optical-thermal conversion material have many advantages, such as available humidity range can be independently desorbed compared with wide, steam, Vapor adsorption amount it is big.
In order to make it easy to understand, can be realized to optical-thermal conversion material according to an embodiment of the present invention first below above-mentioned beneficial to effect
The principle of fruit is briefly described:
Inventor is by further investigation discovery, and current optical-thermal conversion material, that there are water vapor absorption performances is poor, is difficult to
Independent molding needs additionally to be responsible on the matrix of better mechanical property the problems such as.Specifically, for based on carbon nanomaterial
For optical-thermal conversion material, although the carbon nanomaterials such as graphene have preferable thermal conductivity, and have in full spectral region
There is preferable photo absorption performance, and mechanical performance is stronger, suitable for preparing optical-thermal conversion material, but for utilizing water vapor in air
For optical-thermal conversion material, water absorbing properties are simultaneously not ideal enough.And common hygroscopicity high molecular material, such as silica type, point
The materials such as son sieve class, organic metal framework (MOF), have preferable moisture pick-up properties but do not have photothermal conversion performance or material
Mechanical strength is poor, it is difficult to which the block structure for forming reliable self-supporting is needed to be supported on and formed on other matrixes.Therefore, such as
It is capable of providing a kind of gel, grapheme material and the high molecular advantage of moisture absorption is had both, then can greatly improve optical-thermal conversion material
Water yield and produce water efficiency.
In view of this, the invention proposes a kind of aeroge including graphene and absorbent polymer.The airsetting matrix
Body due to having both the more excellent photothermal conversion performance of carbon nanomaterial with graphene and absorbent polymer, and
The ability of the absorption steam of absorbent polymer.Also, in optical-thermal conversion material according to an embodiment of the present invention, aeroge matrix tool
Have preferable mechanical performance, can self-supporting it is blocking, the biggish block of volume can be formed without being supported on other matrixes, can be straight
It connects for sea water desalination or in the water purification technology based on water vapour.
According to an embodiment of the invention, the specific material of the absorbent polymer in aeroge matrix is not particularly limited, only
There is preferable moisture pick-up properties, and there is certain compatibility between graphene.For example, poly- using more hydrophilic groups
Close the absorbent polymer that object is formed in aeroge matrix.In the present invention, term " how hydrophilic based polyalcohol " refers in particular to polymer list
In body include the material of hydrophilic group, such as may include carboxyl, hydroxyl and at least one sulfonic in monomer.Such as have
Body, absorbent polymer may include polyacrylic acid and its salt, alginic acid, polystyrolsulfon acid and its salt.For example, polyacrylic acid
Sodium (Sodium polyacrylate, hereinafter referred to as PAAS) itself water absorbing properties are preferable, and can be with the bone of graphene aerogel
Frame structure can be merged preferably, to can further improve the Vapor adsorption amount of the optical-thermal conversion material, while guarantee airsetting
Matrix body can maintain complete block structure.
According to an embodiment of the invention, the quality of absorbent polymer and the quality of graphene be not by spy in aeroge matrix
It does not limit, as long as not influencing the molding of aeroge matrix, and the integrality of block can be kept after absorbing water vapour.Example
Such as, some specific embodiments according to the present invention, the quality of polymer and the mass ratio of graphene can be in aeroge matrix
For 0.1-1.5.More specifically, the aeroge matrix can be and be mixed by absorbent polymer with graphite oxide solution, after by
Type processing and reduction treatment and formed.In the mixed solution of absorbent polymer and graphite oxide, the matter of absorbent polymer
Amount can be 0.01~0.8 with the mass ratio of graphite oxide, for example, can for 10%, 15%, 20%, 25%, 40%,
60% etc..Graphite oxide passes through reduction treatment, is reduced to graphene, and the process does not influence graphite oxide and absorbent polymer
The molding of aerogel block body, after by reduction treatment, aeroge matrix can still be kept the aeroge containing graphite oxide
Good block structure, and there is certain mechanical performance, after the absorption of multiple steam and desorption, block has no aobvious
The fragmentation of work, it is scaling-off situations such as occur.
According to an embodiment of the invention, since aeroge matrix has had both the good photothermal conversion performance of graphene, and
The moisture pick-up properties of absorbent polymer (such as PAAS), therefore the optical-thermal conversion material can absorb the water in air in full humidity range
Point.Also, aeroge matrix has porous structure, and the aperture of porous structure is 25~60 microns.Pore diameter range is in above range
On the one hand interior aeroge can guarantee there is biggish reference area, to improve the water absorption of the optical-thermal conversion material, separately
On the one hand it is also ensured that the mechanical performance of the aeroge matrix.The saturation of optical-thermal conversion material according to an embodiment of the present invention is inhaled
Water can reach 5.05g/g.
It, can also be into one in the optical-thermal conversion material in order to further increase the photothermal conversion performance of the optical-thermal conversion material
Step includes metal catalyst particles, such as, it may include metal or metal oxide catalyst particle.The aeroge matrix it is more
Pore structure can provide good load matrix for catalyst granules, and graphene aerogel can also by such as hydro-thermal at
The modes such as metal salt are added during type, easily metal catalyst particles are incorporated on aeroge matrix.
According to an embodiment of the invention, absorbance of the above-mentioned optical-thermal conversion material in full spectral region can be higher than 95%.
The optical-thermal conversion material has good photothermal conversion efficiency as a result, most luminous energy in sunlight can be converted to heat
Energy.Also, the optical-thermal conversion material is in 1kW/m2Light intensity irradiation under, the surface temperature of the optical-thermal conversion material can be greater than 85
Degree Celsius.In other words, since the optical-thermal conversion material has good photothermal conversion efficiency, Spontaneous adsorption is in the photo-thermal
Water vapour (being condensed into liquid water) inside transition material can spontaneously evaporate disengaging on the surface of the material, and autonomous desorption occurs, from
Without additionally energizing, the recycling of water purification (water vapour) can be realized.
Also, the component of above-mentioned optical-thermal conversion material is simple, and preparation method is also not particularly limited, and can simply expand
Mass production scale.Ideal graphene and absorbent polymer proportion not only can guarantee the optical-thermal conversion material can have compared with
Good photothermal conversion efficiency and water yield, and the component (expands the aeroge matrix of single preparation in expanding production
Volume) when, it is also ensured that the aeroge matrix of bulk also can be formed preferably, need to be additionally provided matrix to eliminate
And the operation for loading optical-thermal conversion material.
In another aspect of this invention, the invention proposes a kind of methods for preparing previously described optical-thermal conversion material.
Specifically, this method comprises:
S100: aerogel precursor body is formed
According to an embodiment of the invention, in this step, graphite oxide and absorbent polymer being mixed and being lyophilized first
Form aeroge matrix precursor.
Specifically, graphite oxide solution and solution containing absorbent polymer can be mixed.To use poly- third
Olefin(e) acid sodium is for absorbent polymer, mixed solution can be graphite oxide solution and the aqueous solution of Sodium Polyacrylate.More
Body, mixing, which can be, acutely shakes and realizes using turbula shaker, to enable graphite oxide and Sodium Polyacrylate mixed
It closes in solution and is uniformly mixed, and ultrasonic treatment can be aided with, for example, can carry out 10min's or so after carrying out vortex oscillation
Ultrasonic treatment.
As previously mentioned, the concrete content of graphite oxide and Sodium Polyacrylate is not particularly limited in mixed solution, as long as
Subsequent after reduction, the mass ratio of quality and graphene that the polymer in aeroge matrix can be enabled 0.05~
In the range of 0.8.For example, specifically, the graphene oxide solution of 10~20mg/ml can be selected, mix with polyacrylic acid
Sodium water solution, and appropriate amount of deionized water is added, enabling the ultimate density of graphite oxide in mixed solution is 3-7mg/ml, PAAS's
Content is 0.01~0.35 (mass ratio) of graphite oxide content, for example, can for 10%, 15%, 20%, 25%,
40%, 60% etc..It is convenient for forming aerogel precursor body using freeze-drying as a result,.
According to a particular embodiment of the invention, frozen dried, which can be, carries out under -30~-60 degrees Celsius, freeze-drying
Time can be 30~50 hours.Specifically, above-mentioned solution can be poured into any mold, in liquid nitrogen surface freezing, use is cold
Lyophilizer dry 48h at -50 DEG C.
In order to further increase the processability of the aerogel precursor body obtained after freeze-drying, can be carried out in mixed solution
Before freeze-drying, ethanol solution is added in mixed solution in advance.For example, the volume ratio of ethanol solution and mixed solution can be
(1:25)~(1:35), for example, can be 1:30.Processability after can further improve mixed solution freeze-drying as a result,.Invention
People's discovery, ethyl alcohol, which is added, can reduce the surface tension of mixed solution, and prevents from unevenly forming ice crystal in refrigerating process and cause
Sample fragmentation.
It, can also be into one in the optical-thermal conversion material in order to further increase the photothermal conversion performance of the optical-thermal conversion material
Step includes metal catalyst particles, such as, it may include metal or metal oxide catalyst particle.The aeroge matrix it is more
Pore structure can provide good load matrix for catalyst granules.Specifically, can add in the mixed solution before freeze-drying
Enter such as metal salt solution or metallic particles and mix, metallic particles can be compounded in airsetting during molding is lyophilized
On matrix body.Alternatively, can also by include but is not limited to solvent heat process, metal salt solution is converted into metal oxide
It is supported on aeroge matrix Deng the particle with photothermal conversion or promotion heating conduction to serve as metallic catalyst.
S200: reduction treatment is carried out to aerogel precursor body
In this step, reduction treatment is carried out to aerogel precursor body, to form aeroge matrix, and obtains the photo-thermal
Transition material.This method is easy to operate, and convenient for expanding the scale of production, and the optical-thermal conversion material obtained has at least the following advantages
At least one of: it can with humidity range, wider, steam can be independently desorbed, Vapor adsorption amount is big etc..
According to an embodiment of the invention, reduction treatment may include: to be placed in aerogel precursor body and hydrazine hydrate solution
In closed container, 70-100 degrees Celsius is heated, heating time is 4-16 hours.It as a result, can be easily by aerogel precursor body
In graphite oxide be reduced to graphene.
The solution of the present invention is explained below in conjunction with embodiment.It will be understood to those of skill in the art that following
Embodiment is merely to illustrate the present invention, and should not be taken as limiting the scope of the invention.Particular technique or item are not specified in embodiment
Part, it described technology or conditions or is carried out according to the literature in the art according to product description.
Embodiment 1:
1. preparing graphene oxide solution by Hummers method, its concentration is adjusted to 15mg mL by being centrifuged-1。
2. taking above-mentioned solution 10mL, sodium polyacrylate solution (2.7mg mL is added-1) 13.9mL, deionized water 6.1mL obtains
The solution for being 1/4 to PAAS/GO mass ratio.Ethyl alcohol 1mL is added, is ultrasonically treated 15min.
3. above-mentioned mixed solution is poured into mold, freezed on liquid nitrogen surface, then using freeze drier -50
Degree Celsius freeze-drying 48h, obtain GO/PAAS aeroge.
4. above-mentioned aeroge is placed in closed container, 1mL hydrazine hydrate (80%) solution is added, in 80 degrees Celsius of baking ovens
Interior reduction 12h, obtains aeroge matrix.
Embodiment 2:
Remaining step is with embodiment 1, the difference is that configuration obtains PAAS/GO matter when forming the mixed solution of freeze-drying
Amount is than the solution for 1:10.
Embodiment 3:
Remaining step is with embodiment 1, the difference is that configuration obtains PAAS/GO matter when forming the mixed solution of freeze-drying
Amount is than the solution for 1:7.
Embodiment 4:
Remaining step is with embodiment 1, the difference is that configuration obtains PAAS/GO matter when forming the mixed solution of freeze-drying
Amount is than the solution for 1:5.
Embodiment 5:
Remaining step is with embodiment 1, the difference is that configuration obtains PAAS/GO matter when forming the mixed solution of freeze-drying
Amount is than the solution for 1:3.
Embodiment 6:
Remaining step is with embodiment 1, the difference is that using alginic acid for absorbent polymer, in the mixing for forming freeze-drying
When solution, configuration obtains alginic acid: GO mass ratio is the solution of 1:4.
Embodiment 7:
Remaining step is with embodiment 1, the difference is that using alginic acid for absorbent polymer, in the mixing for forming freeze-drying
When solution, configuration obtains alginic acid: GO mass ratio is the solution of 1:7.
Embodiment 8:
Remaining step is with embodiment 1, the difference is that using polystyrolsulfon acid for absorbent polymer, is lyophilized being formed
Mixed solution when, configuration obtain polystyrolsulfon acid: GO mass ratio be 1:5 solution.
Embodiment 9:
Remaining step is with embodiment 1, the difference is that using polystyrolsulfon acid for absorbent polymer, is lyophilized being formed
Mixed solution when, configuration obtains polystyrolsulfon acid and receives: GO mass ratio is the solution of 1:5.
Comparative example 1:
1. preparing graphene oxide solution by Hummers method, its concentration is adjusted to 15mg mL by being centrifuged-1.
2. taking above-mentioned solution 30mL.Ethyl alcohol 1mL is added, ultrasonic treatment 15min formula solution is uniformly mixed.
3. above-mentioned mixed solution is poured into mold, freezed on liquid nitrogen surface, then using freeze drier -50
Degree Celsius freeze-drying 48h, obtain GO aeroge.
4. above-mentioned aeroge is placed in closed container, 1mL hydrazine hydrate (80%) solution is added, in 80 degrees Celsius of baking ovens
Interior reduction 12h obtains the PGF aeroge.
Comparative example 2:
Remaining step is with embodiment 1, the difference is that configuration obtains PAAS/GO matter when forming the mixed solution of freeze-drying
Amount is than the solution for 0.35/1.
Comparative example 3:
Remaining step is with embodiment 1, the difference is that configuration obtains PAAS/GO matter when forming the mixed solution of freeze-drying
Amount is than the solution for 1:20.
Comparative example 4:
Remaining step is with embodiment 1, the difference is that being added without ethanol solution before freeze-drying.
Performance characterization:
Aerogel material is scanned Electronic Speculum (SEM) characterization, embodiment 1-9 all has similar pattern.With embodiment 1
For, the SEM with reference to Fig. 2 and Fig. 3, from upper surface, it can be seen that the optical-thermal conversion material has pore-size distribution micro- in 30-50
The porous structure of rice.
Embodiment 1-9 is carried out in absorptivity and the full humidity range of the full spectral region of sunlight (250~2500nm)
Test to water vapor absorption effect, embodiment 1-9 all have preferable absorbing ability and water absorptivity.With the survey of embodiment 1
For test result, with reference to Fig. 4, the absorptivity of optical-thermal conversion material is 95%, has good absorption to sunlight, and pure
The identical block materials of volume of PAAS preparation, do not have absorbing ability substantially.
With reference to the optical-thermal conversion material that Fig. 5, embodiment 1 are obtained, work well in full humidity range to water vapor absorption, speed
Rate is very fast, and refers to Fig. 6, which can have the up to water absorption of 5.5g/g, it may be assumed that 1g optical-thermal conversion material can
Absorption quality is in its 5 times or more of water.
Steam is absorbed for 24 hours under saturated humidity to embodiment 1-5 and comparative example 1-3, to test above-described embodiment and right
The saturated water adsorptive value of ratio.Testing time is for 24 hours (Fig. 7).Saturated water adsorptive value effect when PAAS/GO mass ratio is 1/4 is best,
When PAAS/GO mass ratio is 0.35:1, saturated water adsorptive value be decreased significantly.This may be as caused by PAAS load excessively
Caused by structure collapses.
With reference to Fig. 8, it is added without ethyl alcohol, it is difficult to obtain more complete big blocky optical-thermal conversion material, but have no effect on
The photothermal conversion performance of the material of moulding section.
Embodiments of the present invention are described in detail above, still, the tool during present invention is not limited to the embodiments described above
Body details within the scope of the technical concept of the present invention can be with various simple variants of the technical solution of the present invention are made, these letters
Monotropic type all belongs to the scope of protection of the present invention.It is further to note that as described in the above specific embodiments each
A particular technique feature can be combined in any appropriate way in the case of no contradiction.
In the description of the present invention, it is to be understood that, term " on ", "lower", "outside", "inner", "top", "bottom" etc. indicate
Orientation or positional relationship be based on the orientation or positional relationship shown in the drawings, be merely for convenience of description the present invention and simplification retouch
It states, rather than the device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation,
Therefore it is not considered as limiting the invention.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of optical-thermal conversion material characterized by comprising
Aeroge matrix, the aeroge matrix include graphene and absorbent polymer, and the absorbent polymer includes mostly close
Aqueous-based polymers.
2. optical-thermal conversion material according to claim 1, which is characterized in that form the monomer of the how hydrophilic based polyalcohol
Including carboxyl, hydroxyl and at least one sulfonic.
3. optical-thermal conversion material according to claim 2, which is characterized in that the absorbent polymer include polyacrylic acid and
Its salt, alginic acid, polystyrolsulfon acid and its salt.
4. optical-thermal conversion material according to claim 3, which is characterized in that in the aeroge matrix, the moisture absorption is poly-
The mass ratio of the quality and the graphene of closing object is 0.1~1.5.
5. optical-thermal conversion material according to claim 1, which is characterized in that the aeroge matrix can be in full humidity range
Moisture in interior absorption air.
6. optical-thermal conversion material according to claim 1, which is characterized in that the aeroge matrix has porous structure,
The aperture of the porous structure is 25~60 microns.
7. optical-thermal conversion material according to claim 1, which is characterized in that the saturated water adsorptive value of the optical-thermal conversion material
It can reach 5.05g/g,
Optionally, absorbance of the optical-thermal conversion material in full spectral region can be higher than 95%；
Optionally, in 1kW/m2Light intensity irradiation under, the surface temperature of the optical-thermal conversion material can be greater than 85 degrees Celsius.
8. a kind of method for preparing the described in any item optical-thermal conversion materials of claim 1-7, which is characterized in that the method
Include:
Graphite oxide and absorbent polymer are mixed and are lyophilized to form aeroge matrix precursor；
Reduction treatment is carried out to the aeroge matrix, to form aeroge matrix, and obtains the optical-thermal conversion material.
9. according to the method described in claim 8, it is characterized in that, by graphite oxide solution and containing the absorbent polymer
Solution mixed, the concentration of graphite oxide described in mixed solution is 3-7mg/ml, moisture absorption described in the mixed solution
The ratio of the quality of polymer and the graphite oxide quality is 0.05~0.8；
Optionally, before carrying out the freeze-drying, concussion mixing is carried out to the mixed solution and ultrasonic mixing is handled；
Optionally, the frozen dried is lyophilized 30~50 hours under -30~-60 degrees Celsius；
Optionally, the reduction treatment includes: that the aerogel precursor body and hydrazine hydrate solution are placed in closed container, is added
Hot 70-100 degrees Celsius, heating time is 4-16 hours.
10. according to the method described in claim 8, it is characterized in that, by the graphite oxide and the absorbent polymer into
After row mixing, before being lyophilized, ethanol solution is added in mixed solution in advance,
The volume ratio of the ethanol solution and the mixed solution is 1:25~1:35.
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| CN201910489808.3A CN110330749B (en) | 2019-06-06 | 2019-06-06 | Photothermal conversion material and method for producing same |
| PCT/CN2019/122615 WO2020244178A1 (en) | 2019-06-06 | 2019-12-03 | Solar thermal conversion material and manufacturing method therefor |
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| CN111116976A (en) * | 2019-12-30 | 2020-05-08 | 东华大学 | Nanofiber aerogel-based solar water evaporator and preparation method thereof |
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| WO2020244178A1 (en) * | 2019-06-06 | 2020-12-10 | 清华大学 | Solar thermal conversion material and manufacturing method therefor |
| CN113150364A (en) * | 2021-03-29 | 2021-07-23 | 南京林业大学 | Photo-thermal response type bio-based aerogel and preparation method thereof |
| CN113215828A (en) * | 2021-06-10 | 2021-08-06 | 中国科学院苏州纳米技术与纳米仿生研究所 | Perforated graphene aerogel moisture absorption fiber, and preparation method and application thereof |
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| CN113501995B (en) * | 2021-08-04 | 2022-08-19 | 中国海洋大学 | Natural polymer-based atmospheric water collecting material and preparation method thereof |
Also Published As
| Publication number | Publication date |
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| WO2020244178A1 (en) | 2020-12-10 |
| CN110330749B (en) | 2021-03-23 |
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