CN107118395B - A kind of carbon-based photothermal conversion film and its preparation method and application and a kind of photothermal conversion device - Google Patents
A kind of carbon-based photothermal conversion film and its preparation method and application and a kind of photothermal conversion device Download PDFInfo
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/02—Cellulose; Modified cellulose
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/10—Esters of organic acids, i.e. acylates
- C08L1/12—Cellulose acetate
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/02—Cellulose; Modified cellulose
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/08—Cellulose derivatives
- C08J2301/10—Esters of organic acids
- C08J2301/12—Cellulose acetate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2479/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2461/00 - C08J2477/00
- C08J2479/02—Polyamines
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
Abstract
The present invention provides a kind of carbon-based photothermal conversion film and its preparation method and application and a kind of photothermal conversion devices.The present invention prepares expansion carbon black by microwave treatment, improve the photothermal conversion performance of expansion carbon black, reusing crosslinking agent makes the amino group on the carboxylic group for expanding carbon blacksurface and cellulose mixture surface crosslink reaction, generate amido bond, make to expand carbon black and cellulose mixture filter membrane realizes chemistry key connection, to improve the mechanical stability of carbon-based photothermal conversion film, realize reusable.Carbon-based photothermal conversion film of the invention is assembled into photothermal conversion device, gained photothermal conversion device 1kW/m2Illumination condition under, photothermal conversion efficiency can reach 85%, and 14 times repetition test after is still able to maintain stable light thermal property.
Description
Technical field
The present invention relates to the technical field of composite material, in particular to a kind of carbon-based photothermal conversion film and preparation method thereof
With application and a kind of photothermal conversion device.
Background technique
Modern society, due to the increasingly exacerbation of energy crisis and problem of environmental pollution, solar energy is as a kind of reproducible
Clean energy resource more and more receives the concern of society.The surface plasmon resonance effect of nanoparticle can produce part
The generation of heat, localized heat can promote solar energy highly effective to be converted into steam energy, this is produced with traditional by heating unitary fluid
Raw steam is very different, and the generation of local thermal energy can reduce thermal loss, realize efficient solar energy and steam energy
Conversion.This technology, which is gathered around, to have broad application prospects, such as: sea water desalination, induction power generation, liquid fractionation, medical apparatus sterilizing
Etc..
Currently, main photo-thermal steam converting material mainly has gold, the noble metal nanos such as silver fluid and these substance institutes
The macroscopic material of assembling, but these materials have the shortcomings that expensive, easy reunion, the assembly process is complicated for material, limits
Their practical application.
In addition to noble metal, the inorganic nano materials such as copper sulfide, carbon nanotube, carbon black also have excellent photothermal conversion
Can, but most of these materials are all applied to photothermal conversion device, the heat that solution lower part generates in this device as dispersion liquid
Vapor bubbles needs can just be escaped out across entire solution, cause most of unnecessary thermal loss.In addition, there are also
The report of macroscopic body is assembled by inorganic nano-particle, but these macroscopic bodies rely solely on physical absorption connection, and do not have
Reusability.
Summary of the invention
In view of this, it is an object of that present invention to provide a kind of carbon-based photothermal conversion film and its preparation method and application and one
Kind of photothermal conversion device, it is carbon-based photothermal conversion thin film photo-thermal high conversion efficiency provided by the invention, good mechanical stability, repeatable
It uses.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
The present invention provides a kind of preparation methods of carbon-based photothermal conversion film, comprising the following steps:
Microwave treatment is carried out in confined conditions after carbon black and ferrous acetate are mixed, and obtains expansion carbon black；
Expansion carbon black and crosslinking agent are dispersed in water, expansion carbon black dispersion liquid is obtained；
The moisture in the expansion carbon black dispersion liquid is filtered out using cellulose mixture filter membrane, expands carbon black and cellulose mixture
Reaction is crosslinked, carbon-based photothermal conversion film is obtained；The cellulose mixture filter membrane surface has amino.
Preferably, the mass ratio of the carbon black and ferrous acetate is 1:1~3.
Preferably, the power of the microwave treatment is 800~1000W；
The temperature of the microwave treatment is 260~300 DEG C；
The time of the microwave treatment is 10~20s.
Preferably, the crosslinking agent is the mixed of one or more of polyethyleneimine, polyvinylamine and polyacrylamide
Close object.
Preferably, the mass ratio of the expansion carbon black and crosslinking agent is 1:20~40.
Preferably, it is described expansion carbon black quality and cellulose mixture filter membrane area ratio be (10~30) mg:(10~
20)cm2。
The present invention provides the carbon-based photothermal conversion films of the preparation of preparation method described in above scheme any one.
The present invention provides carbon-based photothermal conversion film the answering in solar energy heat conversion device described in above scheme
With.
The present invention provides a kind of photothermal conversion device, including backing material, by the fully wrapped around water-absorption material of backing material
Expect and be placed in the carbon-based photothermal conversion film as described in above scheme on water-absorbent material surface.
Preferably, the water-absorbent material is dust-free paper；
The backing material is polystyrene foam, mineral wool, rock wool or phenol formaldehyde foam.
The present invention provides a kind of preparation methods of carbon-based photothermal conversion film, comprising the following steps: by carbon black and acetic acid
Microwave treatment is carried out in confined conditions after ferrous iron mixing, obtains expansion carbon black；Expansion carbon black and crosslinking agent are dispersed in water,
Obtain expansion carbon black dispersion liquid；The moisture in the expansion carbon black dispersion liquid is filtered out using cellulose mixture filter membrane, expands carbon black
Reaction is crosslinked with cellulose mixture, obtains carbon-based photothermal conversion film；The cellulose mixture filter membrane surface has amino.
The present invention prepares expansion carbon black by microwave treatment, improves the photothermal conversion performance of expansion carbon black, reusing crosslinking agent makes to expand
The carboxylic group of carbon blacksurface and the amino group on cellulose mixture surface crosslink reaction, generate amido bond, make to expand charcoal
Black and cellulose mixture filter membrane realizes chemistry key connection, to improve the mechanical stability of carbon-based photothermal conversion film, realization can
It reuses.
The present invention provides the carbon-based photothermal conversion films of the preparation of preparation method described in above scheme.
The present invention provides carbon-based photothermal conversion film the answering in solar energy heat conversion device described in above scheme
With.Carbon-based photothermal conversion film provided by the invention has efficient photothermal conversion performance, under the irradiation of sunlight, Ke Yizhi
It connects and converts gas for the low-boiling liquid such as common water, seawater, ethyl alcohol, acetone, have broad application prospects.
The present invention also provides a kind of photothermal conversion device, including backing material, by fully wrapped around dustless of backing material
Paper and it is placed in carbon-based photothermal conversion film described in the above scheme on dust-free paper surface.Embodiment the result shows that, the present invention provide
Photothermal conversion device in 1kW/m2Illumination condition under, photothermal conversion efficiency can reach 85%, and 14 times repetition test after
Still it is able to maintain stable light thermal property.
Detailed description of the invention
Fig. 1 is transmission and reflection map of 1 microwave treatment of the embodiment of the present invention front and back carbon black to light；
Fig. 2 is the SEM photograph of expansion carbon black prepared by the embodiment of the present invention 1；
Fig. 3 is the XPS map for expanding C1s in carbon black prepared by the embodiment of the present invention 1；
Fig. 4 is the infared spectrum of carbon black before and after 1 microwave treatment of the embodiment of the present invention；
Fig. 5 is the flow diagram that the embodiment of the present invention 2 prepares photothermal conversion device；
Fig. 6 is that the embodiment of the present invention 2 uses carbon-based photothermal conversion film and the progress photothermal conversion test of photothermal conversion device
The quality and temperature variation of Shi Shui；
Fig. 7 be 2 use device 1 of the embodiment of the present invention and photothermal conversion device carry out when photothermal conversion test the quality of water and
Temperature variation；
Fig. 8 is the cycle performance test chart of the photothermal conversion device of the embodiment of the present invention 2；
Fig. 9 is that the photothermal conversion device of the embodiment of the present invention 2 carries out the datagram of photothermal conversion test to seawater；
Figure 10 is the photothermal conversion performance test of the photothermal conversion device of the different expansion carbon black masses of the embodiment of the present invention 3
Figure.
Specific embodiment
The present invention provides a kind of preparation methods of carbon-based photothermal conversion film, comprising the following steps:
Microwave treatment is carried out in confined conditions after carbon black and ferrous acetate are mixed, and obtains expansion carbon black；
Expansion carbon black and crosslinking agent are dispersed in water, expansion carbon black dispersion liquid is obtained；
The moisture in the expansion carbon black dispersion liquid is filtered out using cellulose mixture filter membrane, expands carbon black and cellulose mixture
Reaction is crosslinked, carbon-based photothermal conversion film is obtained；The cellulose mixture filter membrane filter membrane surface has amino.
The present invention carries out microwave treatment after mixing carbon black and ferrous acetate in confined conditions, obtains expansion carbon black.?
In the present invention, the mass ratio of the carbon black and ferrous acetate is preferably 1:1~3, more preferably 1:1~2；The partial size of the carbon black
Preferably 500~1000 μm, more preferably 600~800 μm；The present invention is not special to the source of the carbon black and ferrous acetate
It is required that using the carbon black and ferrous acetate in source known to those skilled in the art, it is specific such as commercially available carbon black and acetic acid
It is ferrous.
The present invention is ground after preferably mixing carbon black and ferrous acetate, obtains mixed-powder.The present invention is to grinding
The specific time does not have particular/special requirement, and the partial size of mixed-powder can be made to be less than the partial size of carbon black and ferrous acetate, the present invention
Mix carbon black and ferrous acetate by grinding more uniform.
After obtaining mixed-powder, gained mixed-powder is carried out microwave treatment by the present invention in confined conditions, is expanded
Carbon black.In the present invention, the power of the microwave treatment is preferably 800~1000W, more preferably 900~950W；The microwave
The temperature of processing is preferably 260~300 DEG C, and more preferably 270~280 DEG C；The time of the microwave treatment is preferably 10~
20s, more preferably 15~18s；The device that the present invention uses microwave treatment does not have particular/special requirement, uses those skilled in the art
Well known closed microwave heating appts, it is specific such as closed microwave reactor.In the present invention, the expansion carbon black
Partial size be preferably 10~100nm, more preferably 30~80nm.
In the present invention, ferrous acetate decomposes under microwave irradiation generates ferrous oxide, carbon dioxide, carbon monoxide, oxygen
It is as follows that gas and acetone, acetone and ferrous oxide reaction generate iron, cementite, carbon monoxide and water, specific reaction equation:
Fe(CO2CH3)2→FeO+CH3COCH3+CO2
2Fe(CO2CH3)2→2FeO+2CH3COCH3+2CO+O2
4FeO+CH3COCH3→Fe+Fe3C+2CO+3H2O
The gas that reaction generates can make carbon black pellet volume expansion in confined conditions, and then shell graphene platelet
From becoming expansion carbon black, and by the way that after microwave treatment, expansion carbon blacksurface possesses a large amount of oxygen-containing functional group such as hydroxyl, carboxylic
Base, carbonyl etc., can be used for chemical modification, realize stable covalent linkage.Expansion carbon black prepared by the present invention has than gold nano
The stronger light absorpting ability of particle and excellent localized heat generative capacity, can effectively convert solar energy into hot steam.
In the present invention, doped with a small amount of iron and cementite in gained expansion carbon black, the present invention is not necessarily to expansion carbon black
In iron and cementite separated because iron and carbonization iron surface do not contain the group that can react with amino, it is subsequent can not
It is crosslinked with cellulose mixture film, because without being had an impact to carbon-based photothermal conversion film of the invention.
After obtaining expansion carbon black, the expansion carbon black and crosslinking agent are dispersed in water by the present invention, obtain expansion carbon black point
Dispersion liquid.In the present invention, the crosslinking agent is preferably one or more of polyethyleneimine, polyvinylamine and polyacrylamide
Mixture；When the crosslinking agent is mixture, the present invention does not have particular/special requirement to the mass ratio of each component in mixture, uses
Any mass ratio mixing；The mass ratio of the expansion carbon black and crosslinking agent is preferably 1:20~40, and more preferably 1:25~
35；The mass ratio of the expansion carbon black and water is preferably 1:50~700, more preferably 1:100~600, and most preferably 1:200~
500；The water is preferably deionized water.
The present invention preferably will carry out ultrasound after expansion carbon black, crosslinking agent and water mixing, make to expand carbon black and crosslinking agent dispersion
Yu Shuizhong；The power of the ultrasound is preferably 300~500W, more preferably 400W；The time of the ultrasonic disperse is preferably 1~
3h, more preferably 1.5~2.5h.The present invention to expansion carbon black, crosslinking agent and water order by merging there is no particular/special requirement, using appoint
The order by merging of meaning.
After obtaining expansion carbon black dispersion liquid, the present invention is filtered out in the expansion carbon black dispersion liquid using cellulose mixture filter membrane
Moisture, expand carbon black and cellulose mixture and crosslink reaction, obtain carbon-based photothermal conversion film.In the present invention, described
Cellulose mixture filter membrane surface has amino；The quality of the expansion carbon black and the area ratio of cellulose mixture filter membrane are preferably
(10~30) mg:(10~20) cm2, more preferably (12~25) mg:(10~15) and cm2；The aperture of the cellulose mixture filter membrane
Preferably 0.22~0.45 μm, more preferably 0.45 μm；The thickness of the cellulose mixture filter membrane be preferably 0.18mm~
0.35mm, more preferably 0.2~0.3mm.In the present invention, the cellulose mixture filter membrane surface has amino；The present invention couple
The type of the cellulose mixture filter membrane does not have particular/special requirement, and surface has the cellulose mixture filter membrane of amino；The present invention
There is no particular/special requirement to the source of the cellulose mixture filter membrane, uses cellulose mixture filter membrane well known to those skilled in the art
, specific such as commercially available cellulose mixture filter membrane.
In a specific embodiment of the present invention, preferably by being filtered under diminished pressure the water filtered out in the expansion carbon black dispersion liquid
Point, the present invention does not have particular/special requirement to the concrete operation method being filtered under diminished pressure, can be complete by moisture filter.
In the present invention, expansion carbon blacksurface expands carboxyl and the mixing of carbon blacksurface during the filtration process with carboxyl
The amino on cellulose filter membrane surface crosslinks reaction under the action of crosslinking agent, amido bond is formed, to realize expansion carbon black
With the chemistry key connection of cellulose mixture filter membrane.
The present invention also provides the carbon-based photothermal conversion films of the preparation of preparation method described in above scheme.In the present invention,
Carbon-based photothermal conversion film includes cellulose mixture filter membrane and the expansion carbon black for being connected to cellulose mixture filter membrane surface；The carbon
It is preferably 0.5~1.5mg/cm that the quality of carbon black is expanded in base photothermal conversion film2, more preferably 1~1.5mg/cm2；The present invention
The expansion carbon black of the carbon-based photothermal conversion film surface provided is connected by chemical bond with cellulose mixture film, mechanical stability
It is good.
The present invention provides carbon-based photothermal conversion film the answering in solar energy heat conversion device described in above scheme
With.Carbon-based photothermal conversion film provided by the invention has efficient photothermal conversion performance, under the irradiation of sunlight, Ke Yizhi
It connects and converts vapor and gas for the low-boiling liquid such as common water, seawater, ethyl alcohol, acetone, before wide application
Scape.
The present invention provides a kind of photothermal conversion device, including backing material, by the fully wrapped around water-absorption material of backing material
Expect and be placed in the carbon-based photothermal conversion film as described in above scheme of water-absorbent material upper surface.In the present invention, the water suction
Material is preferably dust-free paper, more preferably cellulose paper, most preferably cellulose acetate paper；The thermal coefficient of the dust-free paper is excellent
It is selected as 0.03~0.05W/mK, more preferably 0.04W/mK；The thickness of the dust-free paper is preferably 0.5mm~0.7mm, more preferably
For 0.6mm.In the present invention, the water-absorbent material has excellent water suction (liquid) performance, in application process, as liquid
Channel liquid is transported to the contact surface of carbon-based photothermal conversion film and water-absorbent material.
In the present invention, the backing material is preferably polystyrene foam, mineral wool, rock wool or phenol formaldehyde foam；It is described
The thermal coefficient of backing material preferably≤0.04W/mK, more preferably≤0.03W/mK；The thickness of the backing material is preferably 1cm
~1.5cm, more preferably 1.1~1.4cm；Backing material of the invention can not only play a supporting role, moreover it is possible to play heat preservation
Effect, can be effectively reduced heat transfer, reduce the heat-energy losses during photothermal conversion, improve steam transformation efficiency.
In a specific embodiment of the present invention, photothermal conversion device provided by the invention is preferably placed in water, seawater, second
The low-boiling point liquids such as alcohol, acetone surface, is allowed to swim on liquid level, and the liquid of foam lower layer is absorbed and in a steady stream by water-absorbent material
It is constantly transported to the contact surface of water-absorbent material Yu carbon-based photothermal conversion film, carbon-based photothermal conversion film produces under illumination condition
Heat energy, to convert steam for the liquid of contact surface.
Below with reference to embodiment to carbon-based photothermal conversion film provided by the invention and its preparation method and application and one kind
Photothermal conversion device is described in detail, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
0.1156g carbon black and 0.1156g ferrous acetate are poured into grinding and ground, mixture is then placed in sealing
In the environment of be put into microwave reactor and react 10s under the conditions of 900W, 300 DEG C expansion carbon black can be obtained；
The expansion carbon black of 0.525g polyethyleneimine and 0.015g is added in 2ml deionized water, mixed liquor is in ultrasonic wave
Obtain uniform dispersion liquid within ultrasonic disperse 1 hour in cleaning machine；Then, dispersion liquid decompression is filtered to the mixing for arriving aperture 0.45um
(filter membrane area is 20cm to cellulose filter membrane2) on, obtain carbon-based photothermal conversion film (ECB/MCE).
The carbon black before and after microwave treatment is detected using ultraviolet spectrometer, acquired results are as shown in Figure 1；According to Fig. 1
As can be seen that expansion carbon black to the light transmission rate of 200~1500nm less than 3%, to the reflectivity of entire sunlight less than 3%,
Therefore carbon black can be inflated there are about 96% light to absorb；
Expansion carbon black is observed using scanning electron microscope, acquired results are as shown in Figure 2；It can see according to fig. 2
Out, expansion carbon black shows graininess nanostructure, and constitutes porous structure containing certain gap between each particle, is conducive to
The evolution of steam.
It is analyzed using C1s of the XPS test to expansion carbon black, gained XPS map is as shown in Figure 3；It can be seen according to Fig. 3
Out, there are three types of the chemical bond of typical carbon, respectively C-C, O-C, O-C=O, the presence of these groups makes to expand expansion carbon black tool
Carbon black can pass through chemistry key connection with cellulose mixture filter membrane.
It is detected using the carbon black of micro- pair of wave of infrared spectroscopy before and after the processing, acquired results are as shown in Figure 4；It can according to Fig. 4
To find out expansion carbon black compared with carbon black about in 2916cm-1There is the peak of an O-H, to preferably demonstrate expansion carbon black and mix
Condensating fiber element filter membrane is to be keyed not physical absorption by chemistry.
Embodiment 2
Polystyrene foam (thickness 1.0cm) is wrapped up using cellulose acetate paper (thickness 0.5mm), is prepared by embodiment 1
Carbon-based photothermal conversion film be placed in cellulose acetate paper upper surface, obtain photothermal conversion device (NES).
The flow diagram for preparing photothermal conversion device is as shown in Figure 5；
Photothermal conversion performance test:
Test 1: carbon-based photothermal conversion film (ECB/MCE) prepared by embodiment 1, photothermal conversion manufactured in the present embodiment
Device (NES) is placed on the water surface, carries out photothermal conversion test, and control intensity of illumination is 1kW/m2, temperature and quality to water become
Change is detected, and acquired results are as shown in fig. 6, Fig. 6 is that the present embodiment uses carbon-based photothermal conversion film and photothermal conversion device
Carry out the quality and temperature variation of water when photothermal conversion test；According to Fig. 6 as can be seen that carrying out photothermal conversion examination using NES
It tests, the mass change of water is 0.583g/s, carries out photothermal conversion test using ECB/MCE, the mass change of water is about 0.174g/
S, and the experimental group of illumination is individually carried out to water, mass change is only 0.064g/s；And the temperature change of NES experimental group system
Minimum only increases 1.1 DEG C.The test result of Fig. 6 shows that carbon-based photothermal conversion film provided by the invention has excellent light
Heat-convertibility energy, the photothermal conversion device photothermal conversion performance being assembled into using carbon-based photothermal conversion film is more excellent, photothermal conversion
More efficient, heat loss is smaller.
Test 2: carbon-based photothermal conversion film is placed directly on polystyrene foam, is denoted as device 1, then device 1 is set
In progress photothermal conversion test on the water surface；Photothermal conversion device (NES) manufactured in the present embodiment is placed on the water surface simultaneously, is carried out
Photothermal conversion test, control intensity of illumination are 1kW/m2, light application time 40min；The temperature and mass change of water are examined
It surveys, acquired results are as shown in fig. 7, Fig. 7 is that the present embodiment use device 1 and photothermal conversion device carry out water when photothermal conversion test
Quality and temperature variation；According to Fig. 7 as can be seen that by (i.e. device 1) after the dust-free paper removal in photothermal conversion device, light
Heat-convertibility can be greatly reduced, and the mass change of water is even lower than the experimental group that illumination is individually carried out to water, illustrate photothermal conversion
Dust-free paper in device plays an important role, and can endlessly be transported to water and the contact of carbon-based photothermal conversion film
Face, to improve photothermal conversion efficiency.
Test 3: carrying out loop test to NES, and acquired results are as shown in figure 8, can be seen that NES device circulation according to Fig. 8
Photothermal conversion performance is almost unchanged after 14 times, illustrates that the device of the invention has excellent mechanical stability and reusability；
Photothermal conversion efficiency is calculated, calculation formula is as shown in Equation 1:
ηep=(mflu×hlv)/qsFormula 1；
In formula 1: ηepIt is photothermal conversion efficiency；
mfluIt is the quality reduction speed of water, g/cm2·s；(mflu=mWater/ (s × t), wherein mWaterFor the mass change of water
(unit g) can be immediately arrived at from Fig. 8, and s is carbon-based photothermal conversion film size (unit cm2), t is time (unit
For s))；
hlvIt is the phase variate that liquid water becomes vaporous water, J/g；
qsIt is intensity of illumination, W/m2。
It can be calculated according to formula 1, photothermal conversion efficiency of the NES in cyclic process can achieve 85% or so.
Test 4: photothermal conversion test is carried out to light water and seawater using NES device, acquired results are as shown in figure 9, Fig. 9
Middle minimum value (light water) is 1.298g, and maximum value (light water) is 1.518g, and average value (light water) is 1.424g；According to figure
9, which can be seen that NES device provided by the invention, also good photothermal conversion performance to seawater, can be applied to sea water desalination.
Embodiment 3
7 groups of carbon-based photothermal conversion films are prepared according to the method for embodiment 1, and wherein the area of cellulose mixture filter membrane is
10cm2, control expansion carbon black mass is 3mg, 10mg, 15mg, 20mg, 25mg, 30mg and 40mg respectively；
7 groups of carbon-based photothermal conversion films are assembled into photothermal conversion device according to the method for embodiment 2, and are used commonly
Cellulose mixture film is assembled into photothermal conversion device in the same manner, carries out photo-thermal according to the method for the test of embodiment 21
Conversion test detects the mass change of water, and acquired results are as shown in Figure 10；According to Figure 10 as can be seen that containing expansion
The mass change of the experimental group water of carbon black is significantly greater than the test group for being free of expansion carbon black, and the NES containing 15mg expansion carbon black
Mass change it is maximum.
Embodiment 4
The dosage of polyethyleneimine in embodiment 1 is adjusted to 0.6g by 0.525g, other preparation conditions with embodiment 1,
Obtain carbon-based photothermal conversion film.
The carbon-based photothermal conversion film of gained is assembled into photothermal conversion device, according to the test 1 of embodiment 2, test 2, examination
The method for testing 3, test 4 carries out photothermal conversion performance test, and acquired results and embodiment 2 are similar.
Embodiment 5
Polyethyleneimine in embodiment 1 is replaced with into polyvinylamine, other preparation conditions obtain carbon-based with embodiment 1
Photothermal conversion film.
The carbon-based photothermal conversion film of gained is assembled into photothermal conversion device, according to the test 1 of embodiment 2, test 2, examination
The method for testing 3, test 4 carries out photothermal conversion performance test, and acquired results and embodiment 2 are similar.
Embodiment 6
Polyethyleneimine in embodiment 1 is replaced with into poly- propionamide, other preparation conditions obtain carbon-based with embodiment 1
Photothermal conversion film.
The carbon-based photothermal conversion film of gained is assembled into photothermal conversion device, according to the test 1 of embodiment 2, test 2, examination
The method for testing 3, test 4 carries out photothermal conversion performance test, and acquired results and embodiment 2 are similar.
Embodiment 7
Polyethyleneimine in embodiment 1 is replaced with into poly- propionamide, other preparation conditions obtain carbon-based with embodiment 1
Photothermal conversion film.
The carbon-based photothermal conversion film of gained is assembled into photothermal conversion device, according to the test 1 of embodiment 2, test 2, examination
The method for testing 3, test 4 carries out photothermal conversion performance test, and acquired results and embodiment 2 are similar.
Embodiment 8
The ultrasonic disperse time is adjusted to 2h, other preparation conditions prepare 7 groups of carbon-based photothermal conversion films with embodiment 3
(area of cellulose mixture filter membrane is 10cm2, respectively control expansion carbon black mass be 3mg, 10mg, 15mg, 20mg, 25mg,
30mg and 40mg), photothermal conversion test is carried out according to the method for embodiment 3, acquired results and embodiment 3 are similar.
As can be seen from the above embodiments, carbon-based photothermal conversion film good mechanical stability provided by the invention repeats
It uses, there is efficient photothermal conversion performance；And using the photothermal conversion device of carbon-based photothermal conversion film preparation in 1kW/m2
Illumination condition under, photothermal conversion efficiency can reach 85%, and 14 times repetition test after is still able to maintain stable light thermal property,
It has broad application prospects.
As seen from the above embodiment, the present invention is the above is only a preferred embodiment of the present invention, it is noted that for
For those skilled in the art, without departing from the principle of the present invention, can also make it is several improvement and
Retouching, these modifications and embellishments should also be considered as the scope of protection of the present invention.
Claims (10)
1. a kind of preparation method of carbon-based photothermal conversion film, comprising the following steps:
Microwave treatment is carried out in confined conditions after carbon black and ferrous acetate are mixed, and obtains expansion carbon black；
Expansion carbon black and crosslinking agent are dispersed in water, expansion carbon black dispersion liquid is obtained；
The moisture in the expansion carbon black dispersion liquid is filtered out using cellulose mixture filter membrane, carbon black is expanded and cellulose mixture occurs
Cross-linking reaction obtains carbon-based photothermal conversion film；The cellulose mixture filter membrane surface has amino.
2. preparation method according to claim 1, which is characterized in that the mass ratio of the carbon black and ferrous acetate is 1:1
~3.
3. preparation method according to claim 1, which is characterized in that the power of the microwave treatment is 800~1000W；
The temperature of the microwave treatment is 260~300 DEG C；
The time of the microwave treatment is 10~20s.
4. preparation method according to claim 1, which is characterized in that the crosslinking agent is polyethyleneimine, polyvinylamine
With the mixture of one or more of polyacrylamide.
5. preparation method according to claim 1 or 4, which is characterized in that the mass ratio of the expansion carbon black and crosslinking agent
For 1:20~40.
6. preparation method according to claim 1, which is characterized in that the quality and cellulose mixture filter of the expansion carbon black
The area ratio of film is (10~30) mg:(10~20) cm2。
7. the carbon-based photothermal conversion film of the preparation of preparation method described in claim 1~6 any one.
8. application of the carbon-based photothermal conversion film as claimed in claim 7 in solar energy heat conversion device.
9. a kind of photothermal conversion device, including backing material, by the fully wrapped around water-absorbent material of backing material and it is placed in water-absorption material
Expect the carbon-based photothermal conversion film as claimed in claim 7 of upper surface.
10. photothermal conversion device according to claim 9, which is characterized in that the water-absorbent material is dust-free paper；
The backing material is polystyrene foam, mineral wool, rock wool or phenol formaldehyde foam.
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| CN108275737B (en) * | 2018-01-25 | 2020-10-30 | 浙江大学 | Method for desalting seawater based on gas-liquid interface heating |
| CN110255523A (en) * | 2018-03-12 | 2019-09-20 | 天津大学 | A kind of preparation method of carbon-based photothermal conversion film |
| CN110260541A (en) * | 2018-03-12 | 2019-09-20 | 天津大学 | Carbon film and its application in photothermal conversion |
| CN110776061A (en) * | 2018-07-31 | 2020-02-11 | 中国科学院青岛生物能源与过程研究所 | Application of photoresponse composite separation membrane in water treatment |
| CN109438771A (en) * | 2018-09-28 | 2019-03-08 | 中国科学院生态环境研究中心 | From flexible carbon-based photothermal conversion film of floating and its preparation method and application |
| CN116585909B (en) * | 2023-07-14 | 2023-09-29 | 中南大学 | Iron-based photo-thermal conversion film and preparation method and application thereof |
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