CN114573064A - Preparation method of arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane - Google Patents
Preparation method of arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane Download PDFInfo
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- 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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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
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- Y02A20/20—Controlling water pollution; Waste water treatment
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Abstract
The invention discloses a preparation method of an arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane, which comprises the following steps: (1) pretreating a metal net; (2) preparing geopolymer slurry; (3) compounding the geopolymer slurry prepared in the step (2) by using an immersion method, and curing to obtain a geopolymer/metal mesh hybrid membrane; (4) placing the membrane in a precursor solution for adsorption or coating, taking out, drying, and then calcining in a protective gas atmosphere, or preparing the precursor solution through hydrothermal reaction to obtain the biochar-geopolymer/metal mesh hybrid membrane; (5) bending and folding to form the arched salt accumulation preventing biochar-based-geopolymer/metal mesh hybrid membrane. The method of the invention uses the metal net with good mechanical property and toughness as the supporting body; the geopolymer is used as a transition layer, can be used as a pore filling material and has an anti-corrosion effect, and can also effectively improve the graphitization degree of the biochar, thereby improving the photo-thermal conversion performance of the material.
Description
Technical Field
The invention relates to a preparation method of a hybrid membrane, in particular to a preparation method of an arched salt accumulation-preventing biochar-based-geopolymer/metal mesh hybrid membrane.
Background
With the growing population, the increasing water pollution and the destruction of water resource environment, one fourth of the population is faced with the serious shortage problem of fresh water resources, and the shortage proportion of fresh water supply is estimated to be close to 40% by 2030 years according to the current water consumption trend. To address the shortage of freshwater resources, people have turned their eyes to oceans that occupy 71% of the earth's area. The seawater desalination technology is paid more attention from various countries. The conventional seawater desalination technologies mainly include a membrane separation technology, a phase-change thermal method technology and a mixing process technology, and a large amount of high-quality heat energy or high-quality electric power is required for seawater desalination. The production of fresh water by the conventional technology consumes a large amount of fossil energy and simultaneously generates a large amount of greenhouse gases and concentrated brine to be discharged into the environment, thereby causing the problem of ecological environmental pollution. Therefore, a new sustainable energy source, solar-driven seawater desalination technology, is being developed. The seawater desalination technology driven by solar energy does not need to consume fossil energy, and fresh water can be cleanly extracted from seawater.
The photo-thermal materials for the solar evaporator developed so far mainly include noble metals, semiconductors and carbon-based materials, which have two advantages over the other two types of materials. First, the carbon-based material has excellent light absorption and light-heat conversion efficiency in a broad spectrum range; secondly, carbon-based materials are less expensive than other materials. As carbon-based materials, graphene, carbon nanotubes, carbon black, biochar, and the like have been developed. Among these carbon-based materials, biochar is the most readily available and inexpensive carbon-based material, and is generally obtained by pyrolysis of biomass material in an anaerobic environment, but biochar obtained by direct pyrolysis of biomass material has low absorption rate to sunlight and low photothermal conversion rate due to low graphitization degree. On the other hand, in the long-term use process of the solar evaporator, the salt crystallization phenomenon inevitably occurs on the surface, thereby inhibiting the absorption of sunlight by the evaporator. At present, the strategies for preventing salt accumulation of the solar evaporator are as follows: the salt deposition is removed or the wettability of the surface of the photothermal material is improved by an additional device to prevent the salt deposition. However, these strategies require additional devices or chemical materials, and have the disadvantages of complicated preparation, high cost, low evaporation efficiency, etc.
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 good mechanical property and toughness as a support body; the geopolymer is used as a transition layer, can be used as a pore filling material and has an anti-corrosion effect, and can also effectively improve the graphitization degree of the biochar, thereby improving the photo-thermal conversion performance of the material.
In order to realize the purpose, the technical scheme provided by the invention is as follows:
a preparation method of an arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane comprises the following operation steps:
(1) pretreating a metal net;
(2) preparing geopolymer slurry;
(3) compounding the metal mesh pretreated in the step (1) with the geopolymer slurry prepared in the step (2) by using a dipping method, and maintaining to obtain a geopolymer/metal mesh hybrid membrane;
(4) putting the geopolymer/metal mesh hybrid membrane obtained in the step (3) into a precursor solution for adsorption or coating, taking out, drying, and then calcining in a protective gas atmosphere, or preparing the precursor solution through hydrothermal reaction to obtain the biochar-based geopolymer/metal mesh hybrid membrane;
(5) and (4) bending and folding the biochar-geopolymer/metal mesh hybrid membrane prepared in the step (4) to form an arched anti-salt-accumulation biochar-geopolymer/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.
Wherein, the metal net pretreatment in the step (1) is to perform chemical etching on 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 mass ratio of the ammonium persulfate to the sodium hydroxide to the deionized water is 0.2-0.4: 1: 10.
Wherein the preparation of the geopolymer slurry in the step (2) is to take metakaolin and slag to be uniformly mixed to obtain mixed powder, add the modified water glass and the deionized water into the mixed powder, mechanically stir and uniformly mix to obtain mixed slurry, and add hydrogen peroxide (H) into the mixed slurry2O2) Mechanically stirring, and mixing.
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 percent2O2) (ii) a 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 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; except that chitosan is dissolved in the acetic acid solution, other precursors are all dissolved in water; the mass concentration of the precursor solution is 1-20%; the adsorption time is more than or equal to 5 min.
Wherein the drying temperature 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 heating rate at 1-10 ℃/min, heat to 400-1000 ℃ and calcine for 1-5 h; the protective gas is nitrogen or argon; the hydrothermal reaction is carried out for 2-12h at 100-300 ℃.
Wherein the arch-shaped height-diameter ratio of the bending folding in the step (5) is (1-1.75): (1.5 to 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 body, a geopolymer is used as a transition layer, and in-situ grown biochar is used as a solar energy absorption material to prepare the foldable biochar-based solar evaporator; the geopolymer can effectively improve the graphitization degree of the biochar base, and a biochar-based hybrid membrane with high graphitization degree can be prepared; the arched biochar-based solar evaporator has a Marangoni effect when interface evaporation is carried out, 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 arched structure is multiplied relative to that of a plane structure, and the arched structure can also improve the heat preservation capacity of the evaporation system and optimize the energy loss of the system; furthermore, the arched biochar-geopolymer/metal mesh hybrid membrane has the advantages of simple preparation and low cost.
Drawings
FIG. 1 is a scanning electron micrograph of each of the biochar-based geopolymer/metal mesh hybrid films prepared in step (4) according to the present invention; wherein (a) - (b) are the biochar-based (lignin) -geopolymer/metal mesh hybrid membrane of example 1, (c) - (d) are the biochar-based (glucose) -geopolymer/metal mesh hybrid membrane of example 2, and (e) - (f) are the biochar-based (chitosan) -geopolymer/metal mesh hybrid membrane of example 3.
FIG. 2 is a picture of the Arch-shaped anti-salt-deposition biochar-based-geopolymer/metal mesh hybrid membrane prepared in example 2 of the invention.
FIG. 3 is a photograph of the arched anti-saltation biochar-based-geopolymer/metal mesh hybrid membrane prepared in example 2 of the present invention after continuous 8-hour evaporation.
FIG. 4 is an evaporation apparatus; 1-the arch-shaped anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane prepared by the invention, 2-absorbent paper, 3-metal copper mesh, 4-PS foam and 5-seawater.
Detailed Description
The following detailed description is to be read in connection with the accompanying drawings, 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 all commercially available unless otherwise specified.
Example 1
A preparation method of an arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane comprises the following operation steps:
(1) metal mesh pretreatment: mixing ammonium persulfate, sodium hydroxide and deionized water according to a mass ratio of 0.2:1:10 to prepare a solution, placing a plurality of metal mesh copper nets cut into 2cm multiplied by 4cm and 200 meshes into the prepared solution for chemical etching for 30min, and then cleaning and drying;
(2) preparing geopolymer slurry: adding sodium hydroxide into the industrial sodium silicate to change the modulus to 2.0 to obtain modified sodium silicate for later use; weighing metakaolin and slag according to the mass ratio of 1:1, uniformly mixing metakaolin and slag to obtain mixed powder, adding the spare modified water glass and deionized water with the modulus of 2.0 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 slurry2O2) Mechanically stirring at 2000r/min for 2min, and mixing; wherein the mass concentration of hydrogen peroxide (H) is 30 percent2O2) The adding amount of (A) is 0.2 percent of the mass of the mixed slurry;
(3) putting the metal mesh copper net pretreated in the step (1) into the geopolymer slurry prepared in the step (2) for soaking for 5s, taking out, and curing in an oven at 60 ℃ for 4h to obtain a geopolymer/metal mesh hybrid membrane;
(4) placing the geopolymer/metal mesh hybrid membrane obtained in the step (3) into a lignin solution with the mass concentration of 5% (the lignin solution is obtained by dissolving alkali lignin in deionized water) for adsorption for 10min, taking out, drying in an oven at 60 ℃ for 20min, keeping the heating rate at 5 ℃/min under the argon atmosphere, heating to 500 ℃ and calcining for 2h to obtain the biochar-based (lignin) -geopolymer/metal mesh hybrid membrane;
(5) and (3) manually bending and folding the biochar-based (lignin) -geopolymer/metal mesh hybrid membrane prepared in the step (4) to form an arch salt accumulation-resistant biochar-based-geopolymer/metal mesh hybrid membrane, wherein the arch-shaped height-diameter ratio of bending and folding is 1.5: 2.
example 2
A preparation method of an arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane comprises the following operation steps:
(1) metal net pretreatment: mixing ammonium persulfate, sodium hydroxide and deionized water according to a mass ratio of 0.5:1:10 to prepare a solution, cutting the solution into a plurality of metal mesh copper nets with the size of 2cm multiplied by 4cm and 200 meshes, putting the metal mesh copper nets into the prepared solution for chemical etching for 30min, and then cleaning and drying;
(2) preparing geopolymer slurry: adding sodium hydroxide into the industrial sodium silicate to change the modulus to 1.2 to obtain modified sodium silicate for later use; weighing metakaolin and slag according to the mass ratio of metakaolin to slag of 0.5:1, uniformly mixing metakaolin and slag to obtain mixed powder, adding the standby modified water glass and deionized water with the modulus of 1.2 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, adding hydrogen peroxide (H) with the mass concentration of 30% into the mixed slurry2O2) Mechanically stirring at 1000r/min for 1min, and mixing; wherein the mass concentration of hydrogen peroxide (H) is 30 percent2O2) The adding amount of the (B) is 0.5 percent of the mass of the mixed slurry;
(3) putting the metal mesh copper net pretreated in the step (1) into the geopolymer slurry prepared in the step (2) for soaking for 5s, taking out, and curing in an oven at 60 ℃ for 1h to obtain a geopolymer/metal mesh hybrid membrane;
(4) putting the geopolymer/metal mesh hybrid membrane obtained in the step (3) into a glucose solution with the mass concentration of 3% (the glucose solution is obtained by dissolving glucose in deionized water) and putting the glucose solution into a hydrothermal reactor (the volume is 50ml) to carry out hydrothermal reaction at the temperature of 200 ℃ for 4h, and after the hydrothermal reaction is finished, cleaning and drying to obtain the biochar-based (glucose) -geopolymer/metal mesh hybrid membrane;
(5) and (3) manually bending and folding the biochar-based (glucose) -geopolymer/metal mesh hybrid membrane prepared in the step (4) to form an arch-shaped salt accumulation-resistant biochar-based-geopolymer/metal mesh hybrid membrane, wherein the arch-shaped height-diameter ratio of bending and folding is 1.5: 2.
example 3
A preparation method of an arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane comprises the following operation steps:
(1) metal mesh pretreatment: mixing ammonium persulfate, sodium hydroxide and deionized water according to a mass ratio of 0.4:1:10 to prepare a solution, cutting the solution into a plurality of metal mesh nickel nets with the size of 2cm multiplied by 4cm and 200 meshes, putting the metal mesh nickel nets into the prepared solution for chemical etching for 20min, and then cleaning and drying;
(2) preparing geopolymer slurry: worker's toolAdding sodium hydroxide into sodium silicate to change the modulus to 1.0 to obtain modified sodium silicate for later use; weighing metakaolin and slag according to the mass ratio of 2:1, uniformly mixing metakaolin and slag to obtain mixed powder, adding the standby modified water glass and deionized water with the modulus of 1.0 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, adding hydrogen peroxide (H) with the mass concentration of 30% into the mixed slurry2O2) Mechanically stirring at 1500r/min for 2min, and mixing; wherein the mass concentration of hydrogen peroxide (H) is 30 percent2O2) The adding amount of the (B) is 0.5 percent of the mass of the mixed slurry;
(3) putting the metal mesh nickel net pretreated in the step (1) into the geopolymer slurry prepared in the step (2) for soaking for 5s, taking out, and curing in an oven at 120 ℃ for 1h to obtain a geopolymer/metal mesh hybrid membrane;
(4) preparing 3 wt% of chitosan solution (wherein 3g of chitosan and 97g of deionized water are added, and 1mL of acetic acid is additionally added), placing the geopolymer/metal mesh hybrid membrane obtained in the step (3) into the chitosan solution with the mass concentration of 3% for adsorption for 5min, taking out, drying in an oven at 60 ℃ for 10min, keeping the heating rate at 5 ℃/min under the nitrogen atmosphere, heating to 500 ℃ and calcining for 2h to obtain the biochar-based (chitosan) -geopolymer/metal mesh hybrid membrane;
(5) and (3) manually bending and folding the biochar-based (chitosan) -geopolymer/metal mesh hybrid membrane prepared in the step (4) to form an arch salt accumulation-resistant biochar-based-geopolymer/metal mesh hybrid membrane, wherein the arch height-diameter ratio of the bending and folding is 1.5: 2.
example 4
The arch-shaped height-diameter ratio of the bending and folding in the step (5) is 1: 2, the rest of the operation is the same as the example 2, and the arched salt accumulation preventing biochar-based geopolymer/metal mesh hybrid membrane is obtained.
The application comprises the following steps:
the arched salt accumulation preventing biochar-based-geopolymer/metal mesh hybrid membranes prepared in the embodiments 1 to 4 of the invention are respectively used as an upper layer (as a sunlight absorber) 1, then absorbent paper is used as a middle layer (as a water supply pipeline) 2, a new metal copper mesh is used as a lower layer (as a support layer) 3, the upper layer, the middle layer and the lower layer are combined to form an evaporator, a beaker is used as a holding vessel for seawater 5, PS foam 4 is used as a heat insulation medium, and an evaporation device (figure 4) is formed together; the absorbent paper 2 is manually and directly clamped and fixed by a newly-taken metal copper net 3 and the hybrid film 1, and then is embedded on the PS foam with the seam together. The prepared arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane works in the evaporation device, when 3.5 wt% of NaCl solution is continuously evaporated on an evaporator for 8 hours to simulate seawater, the evaporation efficiency of the arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane prepared in the example 1 is maintained above 105%, the evaporation efficiency of the arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane prepared in the example 2 is maintained above 120%, the evaporation efficiency of the arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane prepared in the example 3 is maintained about 100%, and the evaporation efficiency of the arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane prepared in the example 4 is maintained above 110%. And 4 arched salt accumulation preventing biochar-based geopolymer/metal mesh hybrid membranes prepared in the examples are continuously evaporated for 8 hours, and no salt crystals exist on the surfaces of the membranes.
The method obtains the biochar-geopolymer/metal mesh hybrid membrane, the hybrid membrane can be prepared into various three-dimensional structural appearances after being bent and folded, carbon spheres grow on the membrane through hydrothermal of glucose solution to the geopolymer/metal mesh hybrid membrane, and the carbon sphere layer is used as a sunlight absorber. When the arched biochar-geopolymer/metal mesh hybrid membrane is applied to seawater desalination, micro-cavity grooves on the microcosmic surface of the biochar-geopolymer/metal mesh hybrid membrane are used for realizing rapid water expansion, continuous water supplement on the membrane can be ensured, and a macroscopic arch bridge structure can form a temperature gradient to cause directional Marangoni flow, so that the accumulation of salt in a high-temperature region is fundamentally inhibited, the generation of the salt concentration gradient on the surface of an evaporator is prevented, and the aim of long-term salt rejection is fulfilled. The arched biochar-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 have been 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 certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. A preparation method of an arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane is characterized by comprising the following operation steps:
(1) pretreating a metal net;
(2) preparing geopolymer slurry;
(3) compounding the metal mesh pretreated in the step (1) with the geopolymer slurry prepared in the step (2) by using a dipping method, and maintaining to obtain a geopolymer/metal mesh hybrid membrane;
(4) putting the geopolymer/metal mesh hybrid membrane obtained in the step (3) into a precursor solution for adsorption or coating, taking out, drying, and then calcining in a protective gas atmosphere, or preparing the precursor solution through hydrothermal reaction to obtain the biochar-based geopolymer/metal mesh hybrid membrane;
(5) and (4) bending and folding the biochar-geopolymer/metal mesh hybrid membrane prepared in the step (4) to form an arched anti-salt-accumulation biochar-geopolymer/metal mesh hybrid membrane.
2. The method for preparing the arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane as claimed in claim 1, wherein the method comprises the following steps: 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 anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane as claimed in claim 1, wherein the method comprises the following steps: the metal net pretreatment in the step (1) is to perform chemical etching on 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 metal net; the mass ratio of the ammonium persulfate to the sodium hydroxide to the water is 0.2-0.4: 1: 10.
4. The method for preparing the arched anti-salt-deposition biochar-based-geopolymer/metal mesh hybrid membrane as claimed in claim 1, wherein the method comprises the following steps: and (3) uniformly mixing metakaolin and slag to obtain mixed powder, adding the 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.
5. The method for preparing the arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane as claimed in claim 4, wherein the method comprises the following steps: 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 30% in mass concentration; 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 speed is 500-3000 r/min, and the time is 0.5-5 min.
6. The method for preparing the arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane as claimed in claim 1, wherein the method comprises the following steps: the curing in the step (3) is performed for 1-24 hours at the temperature of 20-120 ℃.
7. The method for preparing the arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane as claimed in claim 1, wherein the method comprises the following steps: the precursor in the step (4) is obtained by dissolving the precursor in water or an acetic acid solution; the precursor is one of glucose, cellulose, lignin, chitosan or starch biomass materials; except that chitosan is dissolved in the acetic acid solution, other precursors are all dissolved in water; the mass concentration of the precursor solution is 1-20%; the adsorption time is more than or equal to 5 min.
8. The method for preparing the arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane as claimed in claim 1, wherein the method comprises the following steps: the drying temperature in the step (4) is 20-120 ℃, and the drying time is 10-60 min.
9. The method for preparing the arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane as claimed in claim 1, wherein the method comprises the following steps: in the step (4), the calcination is carried out for 1-5 h while keeping the heating rate at 1-10 ℃/min and the temperature at 400-1000 ℃; the protective gas is nitrogen or argon; the hydrothermal reaction is carried out for 2-12h at 100-300 ℃.
10. The method for preparing the arched anti-salt-accumulation biochar-based-geopolymer/metal mesh hybrid membrane as claimed in claim 1, wherein the method comprises the following steps: in the step (5), the arch height-diameter ratio of the bending folding is (1-1.75): (1.5 to 3).
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| CN116408048A (en) * | 2023-03-21 | 2023-07-11 | 西安建筑科技大学 | Preparation and application of hydrothermal biochar/geopolymer composite material |
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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116408048A (en) * | 2023-03-21 | 2023-07-11 | 西安建筑科技大学 | Preparation and application of hydrothermal biochar/geopolymer composite material |
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