CN114573064B - Preparation method of arched salt deposit prevention biochar-base polymer/metal mesh hybrid membrane - Google Patents

Preparation method of arched salt deposit prevention biochar-base polymer/metal mesh hybrid membrane Download PDF

Info

Publication number
CN114573064B
CN114573064B CN202210178951.2A CN202210178951A CN114573064B CN 114573064 B CN114573064 B CN 114573064B CN 202210178951 A CN202210178951 A CN 202210178951A CN 114573064 B CN114573064 B CN 114573064B
Authority
CN
China
Prior art keywords
biochar
geopolymer
metal mesh
arched
mesh hybrid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202210178951.2A
Other languages
Chinese (zh)
Other versions
CN114573064A (en
Inventor
葛圆圆
罗杉杉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangxi University
Original Assignee
Guangxi University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangxi University filed Critical Guangxi University
Priority to CN202210178951.2A priority Critical patent/CN114573064B/en
Publication of CN114573064A publication Critical patent/CN114573064A/en
Application granted granted Critical
Publication of CN114573064B publication Critical patent/CN114573064B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
    • 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
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

Abstract

The invention discloses a preparation method of an arched salt deposit prevention biochar-based polymer/metal mesh hybrid film, which comprises the following steps: (1) pretreatment of a metal net; (2) preparing a geopolymer slurry; (3) Compounding the geopolymer slurry prepared in the step (2) by an impregnation method, and curing to obtain a geopolymer/metal mesh hybrid membrane; (4) Placing the mixture in a precursor solution for adsorption or coating, taking out, drying, and calcining under a protective gas atmosphere, or preparing the precursor solution through hydrothermal reaction to obtain the biochar-based geopolymer/metal mesh hybrid film; (5) The arched salt accumulation preventing biochar-base polymer/metal net hybrid membrane is formed through bending and folding. The method takes the metal net with excellent mechanical property and toughness as a supporting body; the geopolymer is used as a transition layer, and can be used as a pore-filling material and has an anti-corrosion effect, and the graphitization degree of the biochar can be effectively improved, so that the photo-thermal conversion performance of the material is improved.

Description

Preparation method of arched salt deposit prevention biochar-base polymer/metal mesh hybrid membrane
Technical Field
The invention relates to a preparation method of a hybrid membrane, in particular to a preparation method of an arched salt accumulation prevention biochar-based geopolymer/metal mesh hybrid membrane.
Background
With the growth of population, the continuous increase of water pollution and the continuous destruction of water resource environment, at present, a quarter of population faces the serious shortage problem of fresh water resources, and the fresh water supply shortage proportion is estimated to be close to 40% in 2030 according to the current water consumption trend. To address the shortage of fresh water resources, people turn their eyes to the ocean that occupies 71% of the earth's area. Along with this, sea water desalination technology is receiving attention from various countries. Conventional sea water desalination technologies are mainly membrane separation technology, phase-change thermal method technology and mixed technology, and a large amount of high-quality heat energy or high-quality electric power is required for sea water desalination. Fresh water is produced by the conventional technology, a large amount of fossil energy is consumed, and a large amount of greenhouse gas and concentrated brine are generated and discharged into the environment, so that the ecological environment pollution is caused. Therefore, new green sustainable energy-solar driven seawater desalination technologies are beginning to be developed gradually. The solar-driven sea water desalination technology does not need to consume fossil energy, and can cleanly extract fresh water from sea water.
The photo-thermal materials used in solar evaporators developed so far mainly include noble metals, semiconductors and carbon-based materials, and carbon-based materials have two advantages over the other two types of materials. First, the carbon-based material has excellent light absorption and photothermal conversion efficiency in a broad spectrum range; second, carbon-based materials are inexpensive compared to other materials. The carbon-based materials which have been developed at present include graphene, carbon nanotubes, carbon black, biochar and the like. Among these carbon-based materials, biochar is the most readily available and inexpensive carbon-based material, and is usually obtained by pyrolysis of a biomass material under anaerobic conditions, but biochar obtained by direct pyrolysis of a biomass material is low in absorption rate of sunlight and low in photothermal conversion rate due to low graphitization degree. On the other hand, the solar evaporator can not avoid salt crystallization phenomenon on the surface in the long-term use process, thereby inhibiting the solar evaporator from absorbing sunlight. At present, salt accumulation prevention strategies aiming at solar evaporators are as follows: salt deposit is removed or wettability of the surface of the photothermal material is improved by an external device to prevent salt deposit. However, these strategies all require additional devices or chemical materials, and have the disadvantages of complex preparation, high cost, low evaporation efficiency and the like.
Disclosure of Invention
Aiming at the technical problems, the invention provides a preparation method of a biochar-based solar evaporator, which takes a metal net with excellent mechanical property and toughness as a support body; the geopolymer is used as a transition layer, and can be used as a pore-filling material and has an anti-corrosion effect, and the graphitization degree of the biochar can be effectively improved, so that the photo-thermal conversion performance of the material is improved.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the preparation method of the arched salt deposit prevention biochar-geopolymer/metal mesh hybrid membrane comprises the following operation steps:
(1) Pretreating a metal net;
(2) Preparing a geopolymer slurry;
(3) Compounding the geopolymer slurry prepared in the step (2) with the metal net pretreated in the step (1) by a dipping method, and curing to obtain a geopolymer/metal net hybrid film;
(4) Placing the polymer/metal mesh hybrid membrane obtained in the step (3) in a precursor solution for adsorption or coating, taking out, drying, and then calcining under a protective gas atmosphere, or preparing the precursor solution through hydrothermal reaction to obtain the biochar-based polymer/metal mesh hybrid membrane;
(5) And (3) bending and folding the biochar-base polymer/metal mesh hybrid membrane prepared in the step (4) to form an arched salt accumulation prevention biochar-base polymer/metal mesh hybrid membrane.
Wherein, the metal net in the step (1) is one of a copper net, a nickel net or an iron net.
The pretreatment of the metal net in the step (1) is to chemically etch the metal net for 10-40 min by using a solution prepared from ammonium persulfate, sodium hydroxide and deionized water, and then cleaning and drying the metal net; the mass ratio of the ammonium persulfate to the sodium hydroxide to the deionized water is 0.2-0.4:1:10.
Wherein, the step (2) of preparing the geopolymer slurry is to uniformly mix metakaolin and slag to obtain mixed powder, then adding modified water glass and deionized water into the mixed powder, mechanically stirring and uniformly mixing to obtain mixed slurry, and then adding hydrogen peroxide (H) 2 O 2 ) Mechanically stirring and uniformly mixing to obtain the final product.
Wherein the mass ratio of the metakaolin to the slag is 0.5-2:1; the mass ratio of the deionized water to the modified water glass is 0.5-3:1; the modified sodium silicate is obtained by adding sodium hydroxide into industrial sodium silicate to change the modulus to 1.0-2.4; the hydrogen peroxide is hydrogen peroxide (H) with the mass concentration of 30 percent 2 O 2 ) The method comprises the steps of carrying out a first treatment on the surface of the The adding amount of the hydrogen peroxide with the mass concentration of 30% is 0.1-2.0% of the mass of the mixed slurry; the mechanical stirring rotating speed is 500-3000 r/min, and the time is 0.5-5 min.
Wherein the curing in the step (3) is performed for 1-24 hours at 20-120 ℃.
Wherein the precursor in the step (4) is obtained by dissolving the precursor in water or acetic acid solution; the precursor is one of glucose, cellulose, lignin, chitosan or starch biomass materials; the precursor is characterized in that other precursors are dissolved in water except for chitosan which is dissolved in acetic acid solution; the mass concentration of the precursor solution is 1-20%; the adsorption time is more than or equal to 5min.
Wherein the temperature of the drying in the step (4) is 20-120 ℃ and the drying time is 10-60 min.
Wherein, in the step (4), the calcination is to keep the temperature rising rate of 1-10 ℃/min, the temperature rises to 400-1000 ℃ and the calcination time is 1-5 h; the protective gas is nitrogen or argon; the hydrothermal reaction is carried out for 2-12h at 100-300 ℃.
Wherein, in the step (5), the ratio of the arch height to the diameter of the bending and folding arch is (1-1.75): (1.5-3).
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, a flexible metal net with high mechanical strength is used as a support, a geopolymer is used as a transition layer, in-situ grown biochar is used as a solar energy absorbing material, and a foldable biochar-based solar energy evaporator is prepared; the geopolymer can effectively improve the graphitization degree of the biochar base, and can prepare the biochar base hybrid film with high graphitization degree; the arched biochar-based solar evaporator has the Marangoni effect when performing interfacial evaporation, so that the surface of the evaporator can be kept clean in the evaporation process, and salt crystallization is avoided; the evaporation performance of the arch structure is multiplied compared with that of the plane structure, the arch structure can also improve the heat preservation capacity of the evaporation system, and the energy loss of the system is optimized; furthermore, the arched biochar-based polymer/metal mesh hybrid membrane has the advantages of simple preparation and low cost.
Drawings
FIG. 1 is a scanning electron microscope photograph of each biochar-based-geopolymer/metal mesh hybrid film prepared in step (4) according to the present invention; wherein, (a) - (b) are the biochar-based (lignin) -geopolymer/expanded metal hybrid membranes of example 1, (c) - (d) are the biochar-based (glucose) -geopolymer/expanded metal hybrid membranes of example 2, and (e) - (f) are the biochar-based (chitosan) -geopolymer/expanded metal hybrid membranes of example 3.
FIG. 2 is a photograph of arched salt deposit preventing biochar-based polymer/metal mesh hybrid membrane prepared in example 2 of the present invention.
FIG. 3 is a photograph of the arched salt deposit preventing biochar-based polymer/metal mesh hybrid film prepared in example 2 of the present invention after evaporation for 8 hours.
FIG. 4 is an evaporation apparatus; 1-the arched salt deposit prevention biochar-base polymer/metal mesh hybrid membrane prepared by the method, 2-absorbent paper, 3-metal copper mesh, 4-PS foam and 5-seawater.
Detailed Description
The following detailed description, in conjunction with the accompanying drawings, describes in detail, but it is to be understood that the scope of the invention is not limited to the specific embodiments. The raw materials and reagents used in the examples were commercially available unless otherwise specified.
Example 1
The preparation method of the arched salt deposit prevention biochar-geopolymer/metal mesh hybrid membrane comprises the following operation steps:
(1) Pretreatment of a metal net: mixing ammonium persulfate, sodium hydroxide and deionized water according to a mass ratio of 0.2:1:10 to prepare a solution, putting a plurality of metal mesh copper meshes which are cut into 2cm multiplied by 4cm and 200 meshes into the prepared solution, performing chemical etching for 30min, and then cleaning and drying;
(2) Preparation of a geopolymer slurry: sodium hydroxide is added into industrial sodium water glass to change the modulus to 2.0, so as to obtain modified water glass for standby; weighing metakaolin and slag according to the mass ratio of 1:1, uniformly mixing the metakaolin and the slag to obtain mixed powder, adding the standby modified water glass with the modulus of 2.0 and deionized water into the mixed powder (the mass ratio of the deionized water to the modified water glass is 1:1), mechanically stirring and uniformly mixing to obtain mixed slurry, and adding hydrogen peroxide (H) with the mass concentration of 30% into the mixed slurry 2 O 2 ) Mechanically stirring at 2000r/min for 2min, and mixing uniformly to obtain the final product; wherein, the mass concentration of hydrogen peroxide (H) is 30 percent 2 O 2 ) The addition amount of the catalyst is 0.2% of the mass of the mixed slurry;
(3) Immersing the pretreated metal mesh copper mesh in the step (1) in the geopolymer slurry prepared in the step (2) for 5s, taking out, and curing for 4h at 60 ℃ in an oven to obtain a geopolymer/metal mesh hybrid film;
(4) Placing the polymer/metal mesh hybrid membrane obtained in the step (3) in a lignin solution with a mass concentration of 5% (the lignin solution is obtained by dissolving alkali lignin in deionized water), adsorbing for 10min, taking out, drying for 20min at 60 ℃ in an oven, then keeping a heating rate of 5 ℃/min under an argon atmosphere, heating to 500 ℃ and calcining for 2h to obtain the biochar-based (lignin) -polymer/metal mesh hybrid membrane;
(5) The biochar-based (lignin) -geopolymer/metal mesh hybrid membrane prepared in the step (4) is manually bent and folded to form an arched salt accumulation prevention biochar-geopolymer/metal mesh hybrid membrane, and the bent and folded arch height-to-diameter ratio is 1.5:2.
example 2
The preparation method of the arched salt deposit prevention biochar-geopolymer/metal mesh hybrid membrane comprises the following operation steps:
(1) Pretreatment of a metal net: mixing ammonium persulfate, sodium hydroxide and deionized water according to a mass ratio of 0.5:1:10 to prepare a solution, cutting into a plurality of metal mesh copper meshes with the size of 2cm multiplied by 4cm and 200 meshes, putting the metal mesh copper meshes into the prepared solution, performing chemical etching for 30min, and then cleaning and drying;
(2) Preparation of a geopolymer slurry: sodium hydroxide is added into industrial sodium water glass to change the modulus to 1.2, so as to obtain modified water glass for standby; weighing metakaolin and slag according to the mass ratio of 0.5:1, uniformly mixing the metakaolin and the slag to obtain mixed powder, adding the standby modified water glass with the modulus of 1.2 and deionized water into the mixed powder (the mass ratio of the deionized water to the water glass is 0.5:1), mechanically stirring and uniformly mixing to obtain mixed slurry, and adding hydrogen peroxide (H) with the mass concentration of 30% into the mixed slurry 2 O 2 ) Mechanically stirring at 1000r/min for 1min, and mixing uniformly to obtain the final product; wherein, the mass concentration of hydrogen peroxide (H) is 30 percent 2 O 2 ) The addition amount of the catalyst is 0.5% of the mass of the mixed slurry;
(3) Immersing the pretreated metal mesh copper mesh in the step (1) in the geopolymer slurry prepared in the step (2) for 5s, taking out, and curing for 1h at 60 ℃ in an oven to obtain a geopolymer/metal mesh hybrid film;
(4) Placing the polymer/metal mesh hybrid membrane obtained in the step (3) in a glucose solution with the mass concentration of 3% (the glucose solution is prepared by dissolving glucose in deionized water), placing the glucose solution into a hydrothermal reactor (with the capacity of 50 ml) for hydrothermal reaction, wherein the hydrothermal temperature is 200 ℃, the hydrothermal time is 4 hours, and cleaning and drying after the hydrothermal reaction is finished to obtain the biochar-based (glucose) -polymer/metal mesh hybrid membrane;
(5) The biochar-based (glucose) -geopolymer/metal mesh hybrid membrane prepared in the step (4) is bent and folded manually to form an arched salt accumulation prevention biochar-geopolymer/metal mesh hybrid membrane, and the bent and folded arched height-to-diameter ratio is 1.5:2.
example 3
The preparation method of the arched salt deposit prevention biochar-geopolymer/metal mesh hybrid membrane comprises the following operation steps:
(1) Pretreatment of a metal net: mixing ammonium persulfate, sodium hydroxide and deionized water according to a mass ratio of 0.4:1:10 to prepare a solution, cutting into a plurality of metal mesh nickel meshes with the size of 2cm multiplied by 4cm and 200 meshes, putting the metal mesh nickel meshes into the prepared solution, performing chemical etching for 20min, and then cleaning and drying;
(2) Preparation of a geopolymer slurry: sodium hydroxide is added into industrial sodium water glass to change the modulus to 1.0, so as to obtain modified water glass for standby; weighing metakaolin and slag according to the mass ratio of the metakaolin to the slag of 2:1, uniformly mixing to obtain mixed powder, adding the standby modified water glass with the modulus of 1.0 and deionized water into the mixed powder (the mass ratio of the deionized water to the water glass is 1.5:1), mechanically stirring and uniformly mixing to obtain mixed slurry, and adding hydrogen peroxide (H) with the mass concentration of 30% into the mixed slurry 2 O 2 ) Mechanically stirring at 1500r/min for 2min, and mixing uniformly to obtain the final product; wherein, the mass concentration of hydrogen peroxide (H) is 30 percent 2 O 2 ) The addition amount of the catalyst is 0.5% of the mass of the mixed slurry;
(3) Immersing the metal mesh nickel screen pretreated in the step (1) in the geopolymer slurry prepared in the step (2) for 5s, taking out, and curing for 1h at 120 ℃ in an oven to obtain a geopolymer/metal mesh hybrid film;
(4) Preparing a chitosan solution with the mass concentration of 3 percent (3 g of chitosan, 97g of deionized water and 1mL of acetic acid are additionally added), placing the polymer/metal mesh hybrid membrane obtained in the step (3) into the chitosan solution with the mass concentration of 3 percent for adsorption for 5min, taking out, drying for 10min at the temperature of 60 ℃ in an oven, then keeping the temperature rising rate at 5 ℃/min under the nitrogen atmosphere, and heating to 500 ℃ for calcination for 2h to obtain the biochar-based (chitosan) -polymer/metal mesh hybrid membrane;
(5) The biochar-based (chitosan) -geopolymer/metal mesh hybrid membrane prepared in the step (4) is bent and folded manually to form an arched salt accumulation prevention biochar-geopolymer/metal mesh hybrid membrane, and the bent and folded arched height-to-diameter ratio is 1.5:2.
example 4
The ratio of the arch height to the diameter of the bending and folding arch in the step (5) is 1:2, the other operations are the same as in example 2, and an arched salt deposit prevention biochar-based geopolymer/metal mesh hybrid membrane is obtained.
Application:
the arched salt accumulation preventing biochar-based polymer/metal mesh hybrid film prepared in the embodiment 1-4 is respectively used as an upper layer (serving as a sunlight absorber) 1, then water absorbing paper is used as an intermediate layer (serving as a water supply pipeline) 2, a metal copper mesh is newly taken as a lower layer (serving as a supporting layer) 3, the upper layer, the intermediate layer and the lower layer are combined into an evaporator, a beaker is used as a container of seawater 5, and PS foam 4 is used as a heat insulation and heat preservation medium to jointly form an evaporation device (figure 4); the absorbent paper 2 is manually clamped and fixed directly by a newly taken metal copper net 3 and the hybridization film 1, and then is embedded on PS foam with slits. The arched salt-deposition-preventing biochar-base polymer/metal mesh hybrid film prepared by the invention works in the evaporation device, when the evaporation of 3.5wt% NaCl solution on the evaporator is continuously carried out for 8 hours to simulate seawater, the evaporation efficiency of the arched salt-deposition-preventing biochar-base polymer/metal mesh hybrid film prepared by the embodiment 1 is maintained above 105%, the evaporation efficiency of the arched salt-preventing biochar-base polymer/metal mesh hybrid film prepared by the embodiment 2 is maintained above 120%, the evaporation efficiency of the arched salt-preventing biochar-base polymer/metal mesh hybrid film prepared by the embodiment 3 is maintained at about 100%, and the evaporation efficiency of the arched salt-preventing biochar-base polymer/metal mesh hybrid film prepared by the embodiment 4 is maintained above 110%. And 4 arched salt accumulation preventing biochar-geopolymer/metal mesh hybrid films prepared in the embodiment are continuously evaporated for 8 hours, and the surfaces of the arched salt accumulation preventing biochar-geopolymer/metal mesh hybrid films are free of salt crystallization.
The method of the invention obtains the biochar-based polymer/metal mesh hybrid membrane, the hybrid membrane can be prepared into various three-dimensional structural morphologies after being bent and folded. When the arched biochar-geopolymer/metal mesh hybrid membrane is applied to sea water desalination, micro microcavity grooves on the biochar-geopolymer/metal mesh hybrid membrane are utilized to realize rapid water expansion, continuous water supplementing on the membrane can be ensured, a macroscopic arch bridge structure can form a temperature gradient to cause directional Marangoni flow, accumulation of salt in a high temperature area is fundamentally inhibited, generation of salt concentration gradient on the surface of an evaporator is prevented, and the aim of long-term salt rejection is fulfilled. The arched biochar-based geopolymer/metal mesh hybrid membrane has the advantages of simple preparation, low cost, salt accumulation prevention and the like.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims (4)

1. The preparation method of the arched salt deposit prevention biochar-geopolymer/metal mesh hybrid membrane is characterized by comprising the following operation steps of:
(1) Pretreating a metal net;
(2) Preparing a geopolymer slurry;
(3) Compounding the geopolymer slurry prepared in the step (2) with the metal net pretreated in the step (1) by a dipping method, and curing to obtain a geopolymer/metal net hybrid film;
(4) Placing the geopolymer/metal mesh hybrid film obtained in the step (3) in a precursor solution for adsorption or coating, taking out, drying, and then calcining under a protective gas atmosphere, or placing the geopolymer/metal mesh hybrid film in the precursor solution for hydrothermal reaction to obtain the biochar-based geopolymer/metal mesh hybrid film;
(5) Bending and folding the biochar-base polymer/metal mesh hybrid membrane prepared in the step (4) to form an arched salt accumulation prevention biochar-base polymer/metal mesh hybrid membrane;
wherein, the pretreatment of the metal net in the step (1) refers to the chemical etching of the metal net for 10-40 min by using a solution prepared from ammonium persulfate, sodium hydroxide and water, and then cleaning and drying; the mass ratio of the ammonium persulfate to the sodium hydroxide to the water is 0.2-0.4:1:10;
the preparation method comprises the steps of (1) preparing geopolymer slurry, namely uniformly mixing metakaolin and slag to obtain mixed powder, adding modified water glass and water into the mixed powder, mechanically stirring and uniformly mixing to obtain mixed slurry, adding hydrogen peroxide into the mixed slurry, mechanically stirring, and uniformly mixing to obtain the geopolymer slurry; the mass ratio of the metakaolin to the slag is 0.5-2:1; the mass ratio of the water to the modified water glass is 0.5-3:1; the modified sodium silicate is obtained by adding sodium hydroxide into industrial sodium silicate to change the modulus to 1.0-2.4; the hydrogen peroxide is hydrogen peroxide with the mass concentration of 30%; the adding amount of the hydrogen peroxide with the mass concentration of 30% is 0.1-2.0% of the mass of the mixed slurry; the mechanical stirring rotating speed is 500-3000 r/min, and the time is 0.5-5 min;
wherein the precursor in the step (4) is obtained by dissolving the precursor in water or acetic acid solution; the precursor is one of glucose, cellulose, lignin, chitosan or starch biomass materials; the precursor is characterized in that other precursors are dissolved in water except for chitosan which is dissolved in acetic acid solution; the mass concentration of the precursor solution is 1-20%; the adsorption time is more than or equal to 5min; the drying temperature is 20-120 ℃ and the drying time is 10-60 min; the calcination is to keep the temperature rising rate of 1-10 ℃/min, raise the temperature to 400-1000 ℃ and the calcination time of 1-5 h; the protective gas is nitrogen or argon; the hydrothermal reaction is carried out for 2-12h at 100-300 ℃.
2. The method for preparing the arched salt deposit prevention biochar-based polymer/metal mesh hybrid membrane according to claim 1, which is characterized in that: the metal net in the step (1) is one of a copper net, a nickel net or an iron net.
3. The method for preparing the arched salt deposit prevention biochar-based polymer/metal mesh hybrid membrane according to claim 1, which is characterized in that: and (3) curing at 20-120 ℃ for 1-24 h.
4. The method for preparing the arched salt deposit prevention biochar-based polymer/metal mesh hybrid membrane according to claim 1, which is characterized in that: the curvature folded arch height-to-diameter ratio in the step (5) is (1-1.75): (1.5-3).
CN202210178951.2A 2022-02-25 2022-02-25 Preparation method of arched salt deposit prevention biochar-base polymer/metal mesh hybrid membrane Active CN114573064B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210178951.2A CN114573064B (en) 2022-02-25 2022-02-25 Preparation method of arched salt deposit prevention biochar-base polymer/metal mesh hybrid membrane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210178951.2A CN114573064B (en) 2022-02-25 2022-02-25 Preparation method of arched salt deposit prevention biochar-base polymer/metal mesh hybrid membrane

Publications (2)

Publication Number Publication Date
CN114573064A CN114573064A (en) 2022-06-03
CN114573064B true CN114573064B (en) 2023-06-06

Family

ID=81774647

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210178951.2A Active CN114573064B (en) 2022-02-25 2022-02-25 Preparation method of arched salt deposit prevention biochar-base polymer/metal mesh hybrid membrane

Country Status (1)

Country Link
CN (1) CN114573064B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015011004A2 (en) * 2013-07-22 2015-01-29 Solvay Specialty Polymers Usa, Llc Chemical processing articles
CA3030678A1 (en) * 2016-07-20 2018-01-25 Synthos S.A. Process for the production of geopolymer or geopolymer composite
CN109455795A (en) * 2018-11-13 2019-03-12 广西大学 A kind of preparation method of charcoal/porous geological composite membrane of polymer
CN113149115A (en) * 2021-04-25 2021-07-23 中国海洋大学 Multistage heterostructure membrane for photo-thermal seawater desalination and preparation method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015011004A2 (en) * 2013-07-22 2015-01-29 Solvay Specialty Polymers Usa, Llc Chemical processing articles
CA3030678A1 (en) * 2016-07-20 2018-01-25 Synthos S.A. Process for the production of geopolymer or geopolymer composite
CN109455795A (en) * 2018-11-13 2019-03-12 广西大学 A kind of preparation method of charcoal/porous geological composite membrane of polymer
CN113149115A (en) * 2021-04-25 2021-07-23 中国海洋大学 Multistage heterostructure membrane for photo-thermal seawater desalination and preparation method

Also Published As

Publication number Publication date
CN114573064A (en) 2022-06-03

Similar Documents

Publication Publication Date Title
CN110510689B (en) Photo-thermal seawater desalination material with multi-stage structure and preparation method and application thereof
CN109603596B (en) Photo-thermal seawater desalination membrane made of metal organic framework material
CN110105917B (en) Photo-thermal composite material and preparation method and application thereof
CN110510690B (en) Porous photo-thermal film with salt precipitation resistance and preparation and application thereof
CN110627065B (en) Preparation method and application of jute-based nitrogen-containing porous carbon
CN113149115B (en) Multistage heterostructure membrane for photo-thermal seawater desalination and preparation method
CN114405421B (en) Cellulose nanofiber aerogel photothermal interface water evaporation material and preparation method thereof
CN113184940A (en) Photo-thermal conversion material and application thereof in seawater desalination and salt recovery
CN111905767B (en) Nano pompon-shaped molybdenum sulfide/wood-based carbon porous electrode material and preparation method and application thereof
CN110844959A (en) Photothermal water evaporation device based on loofah sponge biomass
CN113152078A (en) Photo-thermal composite material based on carbon fiber cloth and preparation method and application thereof
CN111204829B (en) Solar sewage purification aerogel based on waste paper and graphite and preparation method thereof
CN111628181B (en) Process for preparing gas diffusion layer for fuel cell by using wood as raw material
CN111933962B (en) N, S co-doped metal-free CNS oxygen reduction catalyst and preparation method thereof
CN114573064B (en) Preparation method of arched salt deposit prevention biochar-base polymer/metal mesh hybrid membrane
CN114920979B (en) Modified lignin-based biomass gel and preparation method thereof
CN110358140B (en) Chrysanthemum-shaped bismuth sulfide and polyvinylidene fluoride composite polyurethane sponge and preparation method and application thereof
CN114956040B (en) Nitrogen-oxygen doped hierarchical porous carbon material, preparation method and application
CN214570875U (en) Solar evaporation system capable of ensuring high evaporation rate
CN110511393B (en) Fe-dobdc MOF with copper mesh as matrix, preparation method thereof and application thereof in solar steam generation
CN113716640B (en) Evaporator with double-sided arched flexible carbon film and preparation method thereof
CN115975499B (en) Preparation method of photo-thermal coating composite material for solar energy interface evaporation
CN116751567B (en) Biological carbon photo-thermal composite shaping phase change material and preparation method and application thereof
GB2613689A (en) CuO nanowire-loaded copper mesh and preparation method and use thereof
CN115448400A (en) Preparation method of wood-based evaporator loaded with metal organic framework

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant