CN112678907A - Preparation method of seawater desalination aerogel with high heat-collecting effect - Google Patents
Preparation method of seawater desalination aerogel with high heat-collecting effect Download PDFInfo
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- CN112678907A CN112678907A CN202011390622.1A CN202011390622A CN112678907A CN 112678907 A CN112678907 A CN 112678907A CN 202011390622 A CN202011390622 A CN 202011390622A CN 112678907 A CN112678907 A CN 112678907A
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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
- C02F1/14—Treatment of water, waste water, or sewage by heating by distillation or evaporation using solar energy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/0091—Preparation of aerogels, e.g. xerogels
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/138—Water desalination using renewable energy
- Y02A20/142—Solar thermal; Photovoltaics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
Abstract
The invention discloses a preparation method of a seawater desalination aerogel with a high heat-collecting effect, which comprises the following steps: 1) cu NWs prepared by a hydrothermal method; 2) dispersing Cu NWs in a solution, adding pyrrole and hydrogen peroxide, stirring to enable pyrrole to generate polymerization reaction, and growing the pyrrole on the surface of the CuNWs in situ to obtain Cu NW @ PPy; 3) the high heat-collecting effect seawater desalination aerogel is prepared by utilizing the Cu NW @ PPy and adopting an orientation freezing technology of an ice template method, the mass transfer resistance encountered in the evaporation process of water vapor is effectively reduced by the gel prepared by the method, and the evaporation performance of solar seawater is improved.
Description
Technical Field
The invention belongs to the technical field of seawater desalination and sewage purification, and relates to a preparation method of a seawater desalination aerogel with a high heat-collecting effect.
Background
Fresh water is an important resource for human life, and with the rapid development of industry, the demand of clean water and the discharge of sewage are continuously increasing. The development of seawater/sewage evaporation technology is one of effective ways to solve the problem of water resource shortage in the 21 st century. The solar seawater evaporation technology is renewable, pollution-free and low-cost, and plays an important role in industries such as seawater desalination/wastewater purification and the like in recent years. At present, solar water purification technology has made great progress in equipment design, process flow and other aspects. The preparation of the high-efficiency solar photo-thermal conversion material is the key point for further improving the evaporation efficiency of the solar seawater. For this reason, the following key factors must be considered in designing and manufacturing the photothermal conversion material: 1. high solar absorption efficiency; 2. low thermal conductivity; 3. the porous structure reduces the mass transfer resistance of the water vapor. At present, common photothermal conversion materials comprise black metal nanoparticles, transition metal oxide nanoparticles, graphene, carbon nanotubes, carbon fibers and other materials, starting from broadening the spectrum absorption range, and enhancing the sunlight absorption capacity of the materials, so as to further improve the photothermal conversion efficiency, however, in the prior art, the mass transfer resistance of water vapor is not reduced from the perspective of a porous structure, so that the mass transfer resistance encountered in the water vapor volatilization process is large, and the solar seawater evaporation performance is poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of a seawater desalination aerogel with a high heat-collecting effect.
In order to achieve the purpose, the preparation method of the seawater desalination aerogel with high heat collecting effect comprises the following steps:
1) cu NWs prepared by a hydrothermal method;
2) dispersing Cu NWs in a solution, adding pyrrole and hydrogen peroxide, stirring to enable pyrrole to generate polymerization reaction, and growing the pyrrole on the surface of the CuNWs in situ to obtain CuNW @ PPy;
3) the Cu NW @ PPy is used for preparing the seawater desalination aerogel with the high heat collection effect by adopting an orientation freezing technology of an ice template method.
In the step 1), CuNWs with the diameter of 80 nanometers and the length of 10-100 micrometers are prepared by a hydrothermal method.
The specific operation of the step 1) is as follows:
taking polyvinylpyrrolidone and CuCl2·2H2O, glucose, octadecylamine, hexadecylamine and deionized water, and mixing with polyvinylpyrrolidone and CuCl2·2H2Mixing O, glucose, octadecylamine, hexadecylamine and deionized water, stirring to obtain a blue emulsion, pouring the blue emulsion into a high-pressure reaction kettle for hydrothermal reaction, and after the reaction is finished, performing centrifugal water washing and acetone washing to obtain the CuNWs.
The stirring time is 12 h;
the temperature in the hydrothermal reaction process is 140-200 ℃, and the reaction lasts for 12-60 h.
Polyvinylpyrrolidone, CuCl2·2H2The mass ratio of O, glucose, octadecylamine and hexadecylamine is (0.1-6) g: (0.05-0.5) g: (0.05-0.4) g: (0.1-5.0) g: (0.2-5.0) g.
The specific operation of the step 2) is as follows:
and dispersing the CuNWs in a mixed solution of acetone and water, adding pyrrole and hydrogen peroxide, continuously stirring, carrying out polymerization reaction on the pyrrole, and growing on the surface of the CuNWs in situ.
The mass ratio of CuNWs to acetone to water to pyrrole to hydrogen peroxide is (0.01-0.1) g: (2-4) g: (10-100) g: (0.2-5.0) g: (0.01-0.5) g.
The specific operation of the step 3) is as follows: dispersing 10-100mg of Cu NW @ PPy in 1mL of water, uniformly dispersing by ultrasonic waves, pouring into a 1 x 1 mold, freezing in liquid nitrogen for 1h, and drying in a freeze dryer for 48h to obtain the macroscopic three-dimensional ordered porous seawater desalination aerogel with high heat collection effect.
The invention has the following beneficial effects:
in the preparation method of the seawater desalination aerogel with the high heat-collecting effect, during specific operation, PPy is grown in situ on the surface of the Cu nanowire through an in-situ growth technology, so that the Cu nanowire and the PPy form the nanowire with a core-shell structure, and the seawater desalination material with strong heat absorption, high heat production and high heat retention is constructed, wherein the black PPy has wide spectrum absorption, and the Cu nanowire has a high SPR effect; PPy's coefficient of thermal conductivity is low, and then makes the light and heat conversion efficiency and the sea water evaporation rate of sea water desalination material obtain showing improvement, in addition, in order to improve the solar energy sea water evaporation efficiency of this material more step, utilizes the orientation refrigeration technology of Cu NW @ PPy adoption ice template method to prepare and have high heat-collecting effect sea water desalination aerogel, and the very big mass transfer resistance that meets in the steam volatilization process that reduces to improve the performance of solar energy sea water evaporation.
Drawings
FIG. 1 is a scanning electron microscopy characterization of copper nanowires;
FIG. 2 is an enlarged view of FIG. 1;
FIG. 3 is an SEM image of a Cu @ PPy aerogel in example 1;
FIG. 4 is a surface temperature graph of the Cu @ PPy aerogel in example one at 1sun light intensity for 1sun 0 min;
FIG. 5 is a surface temperature graph of the Cu @ PPy aerogel in example one at 1sun light intensity for 1sun 2 min;
FIG. 6 is a surface temperature graph of the Cu @ PPy aerogel in example one at 1sun light intensity for 1sun 5 min;
FIG. 7 is a surface temperature graph of the Cu @ PPy aerogel in example one at 1sun light intensity for 1sun 30 min;
FIG. 8 is a graph of activity measurements of a Cu @ PPy aerogel sample from example one.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
example one
The preparation method of the seawater desalination aerogel with the high heat collecting effect comprises the following steps:
1) cu NWs prepared by a hydrothermal method;
2) dispersing Cu NWs in a solution, adding pyrrole and hydrogen peroxide, stirring to enable pyrrole to generate polymerization reaction, and growing the pyrrole on the surface of the CuNWs in situ to obtain Cu NW @ PPy;
3) the Cu NW @ PPy is used for preparing the seawater desalination aerogel with the high heat collection effect by adopting an orientation freezing technology of an ice template method.
The specific operation of the step 1) is as follows:
taking polyvinylpyrrolidone and CuCl2·2H2O, glucose, octadecylamine, hexadecylamine and deionized water, and mixing with polyvinylpyrrolidone and CuCl2·2H2Mixing O, glucose, octadecylamine, hexadecylamine and deionized water, stirring to obtain a blue emulsion, pouring the blue emulsion into a high-pressure reaction kettle for hydrothermal reaction, and after the reaction is finished, performing centrifugal water washing and acetone washing to obtain the CuNWs.
The stirring time is 12 h;
the temperature in the hydrothermal reaction process is 200 ℃, and the reaction lasts 12 h.
Polyvinylpyrrolidone, CuCl2·2H2The mass ratio of O, glucose, octadecylamine and hexadecylamine is 0.1 g: 0.1 g: 0.1 g: 1 g: 0.5 g.
The specific operation of the step 2) is as follows:
dispersing CuNWs in a mixed solution of acetone and water, adding pyrrole and hydrogen peroxide, continuously stirring, carrying out polymerization reaction on the pyrrole, and growing the pyrrole on the surface of the CuNWs in situ, wherein the mass ratio of the CuNWs to the acetone to the water to the pyrrole to the hydrogen peroxide is 0.01 g: 1 g: 30g of: 0.2 g: 0.04 g.
The specific operation of the step 3) is as follows: dispersing 10mg of Cu NW @ PPy in 1mL of water, uniformly dispersing by ultrasonic, pouring into a mold with the thickness of 1cm x 1cm, freezing in liquid nitrogen for 1h, and drying in a freeze dryer for 48h to obtain the macroscopic three-dimensional ordered porous seawater desalination aerogel with high heat collection effect.
Example two
The preparation method of the seawater desalination aerogel with the high heat collecting effect comprises the following steps:
1) cu NWs prepared by a hydrothermal method;
2) dispersing Cu NWs in a solution, adding pyrrole and hydrogen peroxide, stirring to enable pyrrole to generate polymerization reaction, and growing the pyrrole on the surface of the CuNWs in situ to obtain CuNW @ PPy;
3) the Cu NW @ PPy is used for preparing the seawater desalination aerogel with the high heat collection effect by adopting an orientation freezing technology of an ice template method.
The specific operation of the step 1) is as follows:
taking polyvinylpyrrolidone and CuCl2·2H2O, glucose, octadecylamine, hexadecylamine and deionized water, and mixing with polyvinylpyrrolidone and CuCl2·2H2Mixing O, glucose, octadecylamine, hexadecylamine and deionized water, stirring to obtain a blue emulsion, pouring the blue emulsion into a high-pressure reaction kettle for hydrothermal reaction, and after the reaction is finished, performing centrifugal water washing and acetone washing to obtain the CuNWs.
The stirring time is 12 h;
the temperature in the hydrothermal reaction process is 140 ℃, and the reaction lasts for 12 hours.
Polyvinylpyrrolidone, CuCl2·2H2The mass ratio of O, glucose, octadecylamine and hexadecylamine is 0.1 g: 0.05 g: 0.05 g: 0.1 g: 0.2 g.
The specific operation of the step 2) is as follows:
dispersing CuNWs in a mixed solution of acetone and water, adding pyrrole and hydrogen peroxide, continuously stirring, carrying out polymerization reaction on the pyrrole, and growing the pyrrole on the surface of the CuNWs in situ, wherein the mass ratio of the CuNWs to the acetone to the water to the pyrrole to the hydrogen peroxide is 0.01 g: 2 g: 10 g: 0.2 g: 0.01 g.
The specific operation of the step 3) is as follows: dispersing 10mg of Cu NW @ PPy in 1mL of water, uniformly dispersing by ultrasonic, pouring into a mold with the thickness of 1cm x 1cm, freezing in liquid nitrogen for 1h, and drying in a freeze dryer for 48h to obtain the macroscopic three-dimensional ordered porous seawater desalination aerogel with high heat collection effect.
EXAMPLE III
The preparation method of the seawater desalination aerogel with the high heat collecting effect comprises the following steps:
1) cu NWs prepared by a hydrothermal method;
2) dispersing Cu NWs in a solution, adding pyrrole and hydrogen peroxide, stirring to enable pyrrole to generate polymerization reaction, and growing the pyrrole on the surface of the CuNWs in situ to obtain CuNW @ PPy;
3) the Cu NW @ PPy is used for preparing the seawater desalination aerogel with the high heat collection effect by adopting an orientation freezing technology of an ice template method.
The specific operation of the step 1) is as follows:
taking polyvinylpyrrolidone and CuCl2·2H2O, glucose, octadecylamine, hexadecylamine and deionized water, and mixing with polyvinylpyrrolidone and CuCl2·2H2Mixing O, glucose, octadecylamine, hexadecylamine and deionized water, stirring to obtain a blue emulsion, pouring the blue emulsion into a high-pressure reaction kettle for hydrothermal reaction, and after the reaction is finished, performing centrifugal water washing and acetone washing to obtain the CuNWs.
The stirring time is 12 h;
the temperature in the hydrothermal reaction process is 200 ℃, and the reaction lasts for 60 hours.
Polyvinylpyrrolidone, CuCl2·2H2The mass ratio of O, glucose, octadecylamine and hexadecylamine is 6 g: 0.5 g: 0.4 g: 5.0 g: 5.0 g.
The specific operation of the step 2) is as follows:
dispersing CuNWs in a mixed solution of acetone and water, adding pyrrole and hydrogen peroxide, continuously stirring, carrying out polymerization reaction on the pyrrole, and growing the pyrrole on the surface of the CuNWs in situ, wherein the mass ratio of the CuNWs to the acetone to the water to the pyrrole to the hydrogen peroxide is 0.1 g: 4 g: 100 g: 5.0 g: 0.5 g.
The specific operation of the step 3) is as follows: dispersing 100mg of Cu NW @ PPy in 1mL of water, uniformly dispersing by ultrasonic, pouring into a mold with the thickness of 1cm x 1cm, freezing in liquid nitrogen for 1h, and drying in a freeze dryer for 48h to obtain the macroscopic three-dimensional ordered porous seawater desalination aerogel with high heat collection effect.
Example four
The preparation method of the seawater desalination aerogel with the high heat collecting effect comprises the following steps:
1) cu NWs prepared by a hydrothermal method;
2) dispersing Cu NWs in a solution, adding pyrrole and hydrogen peroxide, stirring to enable pyrrole to generate polymerization reaction, and growing the pyrrole on the surface of the CuNWs in situ to obtain CuNW @ PPy;
3) the Cu NW @ PPy is used for preparing the seawater desalination aerogel with the high heat collection effect by adopting an orientation freezing technology of an ice template method.
The specific operation of the step 1) is as follows:
taking polyvinylpyrrolidone and CuCl2·2H2O, glucose, octadecylamine, hexadecylamine and deionized water, and mixing with polyvinylpyrrolidone and CuCl2·2H2Mixing O, glucose, octadecylamine, hexadecylamine and deionized water, stirring to obtain a blue emulsion, pouring the blue emulsion into a high-pressure reaction kettle for hydrothermal reaction, and after the reaction is finished, performing centrifugal water washing and acetone washing to obtain the CuNWs.
The stirring time is 12 h;
the temperature in the hydrothermal reaction process is 180 ℃, and the reaction lasts 40 hours.
Polyvinylpyrrolidone, CuCl2·2H2The mass ratio of O, glucose, octadecylamine and hexadecylamine is 1 g: 0.2 g: 0.2 g: 0.2 g: 0.3 g.
The specific operation of the step 2) is as follows:
dispersing CuNWs in a mixed solution of acetone and water, adding pyrrole and hydrogen peroxide, continuously stirring, carrying out polymerization reaction on the pyrrole, and growing the pyrrole on the surface of the CuNWs in situ, wherein the mass ratio of the CuNWs to the acetone to the water to the pyrrole to the hydrogen peroxide is 0.03 g: 2.5 g: 20 g: 2 g: 0.3 g.
The specific operation of the step 3) is as follows: dispersing 20mg of Cu NW @ PPy in 1mL of water, uniformly dispersing by ultrasonic waves, pouring into a mold with the thickness of 1cm x 1cm, freezing in liquid nitrogen for 1h, and drying in a freeze dryer for 48h to obtain the macroscopic three-dimensional ordered porous seawater desalination aerogel with high heat collection effect.
EXAMPLE five
The preparation method of the seawater desalination aerogel with the high heat collecting effect comprises the following steps:
1) cu NWs prepared by a hydrothermal method;
2) dispersing Cu NWs in a solution, adding pyrrole and hydrogen peroxide, stirring to enable pyrrole to generate polymerization reaction, and growing the pyrrole on the surface of the CuNWs in situ to obtain CuNW @ PPy;
3) the Cu NW @ PPy is used for preparing the seawater desalination aerogel with the high heat collection effect by adopting an orientation freezing technology of an ice template method.
The specific operation of the step 1) is as follows:
taking polyvinylpyrrolidone and CuCl2·2H2O, glucose, octadecylamine, hexadecylamine and deionized water, and mixing with polyvinylpyrrolidone and CuCl2·2H2Mixing O, glucose, octadecylamine, hexadecylamine and deionized water, stirring to obtain a blue emulsion, pouring the blue emulsion into a high-pressure reaction kettle for hydrothermal reaction, and after the reaction is finished, performing centrifugal water washing and acetone washing to obtain the CuNWs.
The stirring time is 12 h;
the temperature in the hydrothermal reaction process is 150 ℃, and the reaction lasts 20 hours.
Polyvinylpyrrolidone, CuCl2·2H2The mass ratio of O, glucose, octadecylamine and hexadecylamine is 5 g: 0.5 g: 0.3 g: 4 g: 4g of the total weight.
The specific operation of the step 2) is as follows:
dispersing CuNWs in a mixed solution of acetone and water, adding pyrrole and hydrogen peroxide, continuously stirring, carrying out polymerization reaction on the pyrrole, and growing the pyrrole on the surface of the CuNWs in situ, wherein the mass ratio of the CuNWs to the acetone to the water to the pyrrole to the hydrogen peroxide is 0.09 g: 3.5 g: 90 g: 4 g: 0.4 g.
The specific operation of the step 3) is as follows: dispersing 90mg of Cu NW @ PPy in 1mL of water, uniformly dispersing by ultrasonic, pouring into a mold with the thickness of 1cm x 1cm, freezing in liquid nitrogen for 1h, and drying in a freeze dryer for 48h to obtain the macroscopic three-dimensional ordered porous seawater desalination aerogel with high heat collection effect.
EXAMPLE six
The preparation method of the seawater desalination aerogel with the high heat collecting effect comprises the following steps:
1) cu NWs prepared by a hydrothermal method;
2) dispersing Cu NWs in a solution, adding pyrrole and hydrogen peroxide, stirring to enable pyrrole to generate polymerization reaction, and growing the pyrrole on the surface of the CuNWs in situ to obtain CuNW @ PPy;
3) the Cu NW @ PPy is used for preparing the seawater desalination aerogel with the high heat collection effect by adopting an orientation freezing technology of an ice template method.
The specific operation of the step 1) is as follows:
taking polyvinylpyrrolidone and CuCl2·2H2O, glucose, octadecylamine, hexadecylamine and deionized water, and mixing with polyvinylpyrrolidone and CuCl2·2H2Mixing O, glucose, octadecylamine, hexadecylamine and deionized water, stirring to obtain a blue emulsion, pouring the blue emulsion into a high-pressure reaction kettle for hydrothermal reaction, and after the reaction is finished, performing centrifugal water washing and acetone washing to obtain the CuNWs.
The stirring time is 12 h;
the temperature in the hydrothermal reaction process is 180 ℃, and the reaction lasts for 60 hours.
Polyvinylpyrrolidone, CuCl2·2H2The mass ratio of O, glucose, octadecylamine and hexadecylamine is 0.3 g: 0.3 g: 0.2.5 g: 0.3 g: 3g of the total weight.
The specific operation of the step 2) is as follows:
dispersing CuNWs in a mixed solution of acetone and water, adding pyrrole and hydrogen peroxide, continuously stirring, carrying out polymerization reaction on the pyrrole, and growing the pyrrole on the surface of the CuNWs in situ, wherein the mass ratio of the CuNWs to the acetone to the water to the pyrrole to the hydrogen peroxide is 0.5 g: 3 g: 50 g: 3 g: 0.3 g.
The specific operation of the step 3) is as follows: dispersing 50mg of Cu NW @ PPy in 1mL of water, uniformly dispersing by ultrasonic, pouring into a mold with the thickness of 1cm x 1cm, freezing in liquid nitrogen for 1h, and drying in a freeze dryer for 48h to obtain the macroscopic three-dimensional ordered porous seawater desalination aerogel with high heat collection effect.
EXAMPLE seven
The preparation method of the seawater desalination aerogel with the high heat collecting effect comprises the following steps:
1) cu NWs prepared by a hydrothermal method;
2) dispersing Cu NWs in a solution, adding pyrrole and hydrogen peroxide, stirring to enable pyrrole to generate polymerization reaction, and growing the pyrrole on the surface of the CuNWs in situ to obtain CuNW @ PPy;
3) the Cu NW @ PPy is used for preparing the seawater desalination aerogel with the high heat collection effect by adopting an orientation freezing technology of an ice template method.
The specific operation of the step 1) is as follows:
taking polyvinylpyrrolidone and CuCl2·2H2O, glucose, octadecylamine, hexadecylamine and deionized water, and mixing with polyvinylpyrrolidone and CuCl2·2H2Mixing O, glucose, octadecylamine, hexadecylamine and deionized water, stirring to obtain a blue emulsion, pouring the blue emulsion into a high-pressure reaction kettle for hydrothermal reaction, and after the reaction is finished, performing centrifugal water washing and acetone washing to obtain the CuNWs.
The stirring time is 12 h;
the temperature in the hydrothermal reaction process is 170 ℃, and the reaction lasts 45 hours.
Polyvinylpyrrolidone, CuCl2·2H2The mass ratio of O, glucose, octadecylamine and hexadecylamine is 6 g: 0.05 g: 0.4 g: 0.1 g: 5.0 g.
The specific operation of the step 2) is as follows:
dispersing CuNWs in a mixed solution of acetone and water, adding pyrrole and hydrogen peroxide, continuously stirring, carrying out polymerization reaction on the pyrrole, and growing the pyrrole on the surface of the CuNWs in situ, wherein the mass ratio of the CuNWs to the acetone to the water to the pyrrole to the hydrogen peroxide is 0.01 g: 4 g: 10 g: 5.0 g: 0.01 g.
The specific operation of the step 3) is as follows: dispersing 100mg of Cu NW @ PPy in 1mL of water, uniformly dispersing by ultrasonic, pouring into a mold with the thickness of 1cm x 1cm, freezing in liquid nitrogen for 1h, and drying in a freeze dryer for 48h to obtain the macroscopic three-dimensional ordered porous seawater desalination aerogel with high heat collection effect.
Example eight
The preparation method of the seawater desalination aerogel with the high heat collecting effect comprises the following steps:
1) cu NWs prepared by a hydrothermal method;
2) dispersing Cu NWs in a solution, adding pyrrole and hydrogen peroxide, stirring to enable pyrrole to generate polymerization reaction, and growing the pyrrole on the surface of the CuNWs in situ to obtain Cu NW @ PPy;
3) the Cu NW @ PPy is used for preparing the seawater desalination aerogel with the high heat collection effect by adopting an orientation freezing technology of an ice template method.
The specific operation of the step 1) is as follows:
taking polyvinylpyrrolidone and CuCl2·2H2O, glucose, octadecylamine, hexadecylamine and deionized water, and mixing with polyvinylpyrrolidone and CuCl2·2H2Mixing O, glucose, octadecylamine, hexadecylamine and deionized water, stirring to obtain a blue emulsion, pouring the blue emulsion into a high-pressure reaction kettle for hydrothermal reaction, and after the reaction is finished, performing centrifugal water washing and acetone washing to obtain the CuNWs.
The stirring time is 12 h;
the temperature in the hydrothermal reaction process is 140 ℃, and the reaction lasts for 12 hours.
Polyvinylpyrrolidone, CuCl2·2H2The mass ratio of O, glucose, octadecylamine and hexadecylamine is 0.1 g: 0.5 g: 0.05 g: 5.0 g: 0.2 g.
The specific operation of the step 2) is as follows:
dispersing CuNWs in a mixed solution of acetone and water, adding pyrrole and hydrogen peroxide, continuously stirring, carrying out polymerization reaction on the pyrrole, and growing the pyrrole on the surface of the CuNWs in situ, wherein the mass ratio of the CuNWs to the acetone to the water to the pyrrole to the hydrogen peroxide is 0.1 g: 2 g: 100 g: 5.0 g: 0.01 g.
The specific operation of the step 3) is as follows: dispersing 10mg of Cu NW @ PPy in 1mL of water, uniformly dispersing by ultrasonic, pouring into a mold with the thickness of 1cm x 1cm, freezing in liquid nitrogen for 1h, and drying in a freeze dryer for 48h to obtain the macroscopic three-dimensional ordered porous seawater desalination aerogel with high heat collection effect.
In the step 1) of each example, CuNWs with a diameter of 80 nm and a length of 10-100 μm were prepared by a hydrothermal method.
The invention has the advantages that:
CuNW with excellent SPR effect performance is used as a matrix, PPy with different thicknesses grows on the surface of the Cu nanowire in situ, so that the Cu nanowire and the PPy form a nanowire with a core-shell structure, and a seawater desalination material with strong heat absorption (the black PPy has wide spectrum absorption), high heat yield (the Cu nanowire has high SPR effect) and high heat retention (the PPy has low heat conductivity coefficient) is constructed, and further the photothermal conversion efficiency and the seawater evaporation rate of the seawater desalination material are remarkably improved.
The Cu NW @ PPy with a core-shell structure is used as a raw material, and an aerogel material with a regular rich pore channel structure is prepared by utilizing an oriented freezing technology of an ice template method, wherein the rich pore channel structure solves the problem of mass transfer resistance in the process of heating and evaporating water vapor.
PPy with different thickness can grow on the surface of Cu NW with normal position growth technique messenger, fine reduction the coefficient of heat conductivity of Cu NW, has lower coefficient of heat conductivity behind the preparation Cu NW @ PPy aerogel to play heat retaining effect, prevent that the aerogel from thinking the environment or the excessive heat of water phase transmission, reduce the heat loss.
And finally, the preparation method of the Cu NW @ PPy aerogel has the advantages of cheap raw materials, simple reaction conditions, high photo-thermal conversion efficiency and high water evaporation rate, and is suitable for further large-scale production. The raw material CuCl in the invention2·2H2O, glucose, octadecylamine, hexadecylamine and the like are all cheap and easily available materials. The oriented freezing technology of the ice-cooling template method has the existing large-scale process technology in China.
Claims (8)
1. A preparation method of seawater desalination aerogel with high heat collection effect is characterized by comprising the following steps:
1) cu NWs prepared by a hydrothermal method;
2) dispersing Cu NWs in a solution, adding pyrrole and hydrogen peroxide, stirring to enable pyrrole to generate polymerization reaction, and growing the pyrrole on the surface of the CuNWs in situ to obtain Cu NW @ PPy;
3) the Cu NW @ PPy is used as a raw material, and the high heat-collecting effect seawater desalination aerogel material is prepared by adopting an oriented freezing technology of an ice template method.
2. The method for preparing seawater desalination aerogel with high heat collection effect as claimed in claim 1, wherein CuNWs with diameter of 80 nm and length of 10-100 μm is prepared by hydrothermal method in step 1).
3. The preparation method of seawater desalination aerogel with high heat collecting effect according to claim 1, characterized in that the specific operations of step 1) are as follows:
taking polyvinylpyrrolidone and CuCl2·2H2O, glucose, octadecylamine, hexadecylamine and deionized water, and mixing with polyvinylpyrrolidone and CuCl2·2H2Mixing O, glucose, octadecylamine, hexadecylamine and deionized water, stirring to obtain a blue emulsion, pouring the blue emulsion into a high-pressure reaction kettle for hydrothermal reaction, and after the reaction is finished, performing centrifugal water washing and acetone washing to obtain the CuNWs.
4. The preparation method of seawater desalination aerogel with high heat-collecting effect according to claim 3, characterized in that the stirring time is 12 h;
the temperature in the hydrothermal reaction process is 140-200 ℃, and the reaction lasts for 12-60 h.
5. The method for preparing seawater desalination aerogel with high heat-collecting effect as claimed in claim 3, wherein the polyvinylpyrrolidone and CuCl are added2·2H2The mass ratio of O, glucose, octadecylamine and hexadecylamine is (0.1-6) g: (0.05-0.5) g: (0.05-0.4) g: (0.1-5.0) g: (0.2-5.0) g.
6. The preparation method of seawater desalination aerogel with high heat collecting effect according to claim 1, characterized in that the specific operations of step 2) are as follows:
and dispersing the CuNWs in a mixed solution of acetone and water, adding pyrrole and hydrogen peroxide, continuously stirring, carrying out polymerization reaction on the pyrrole, and growing on the surface of the CuNWs in situ.
7. The preparation method of the seawater desalination aerogel with high heat collecting effect according to claim 6, wherein the mass ratio of CuNWs, acetone, water, pyrrole and hydrogen peroxide is (0.01-0.1) g: (2-4) g: (10-100) g: (0.2-5.0) g: (0.01-0.5) g.
8. The method for preparing seawater desalination aerogel with high heat-collecting effect according to claim 1, wherein the specific operations of step 3) are as follows: dispersing 10-100mg of Cu NW @ PPy in 1mL of water, uniformly dispersing by ultrasonic waves, pouring into a 1 x 1 mold, freezing in liquid nitrogen for 1h, and drying in a freeze dryer for 48h to obtain the macroscopic three-dimensional ordered porous seawater desalination aerogel with high heat collection effect.
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