CN113457647A - Cobalt-modified carbon-based fiber membrane and preparation method thereof - Google Patents
Cobalt-modified carbon-based fiber membrane and preparation method thereof Download PDFInfo
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- CN113457647A CN113457647A CN202110862156.0A CN202110862156A CN113457647A CN 113457647 A CN113457647 A CN 113457647A CN 202110862156 A CN202110862156 A CN 202110862156A CN 113457647 A CN113457647 A CN 113457647A
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- 239000000835 fiber Substances 0.000 title claims abstract description 85
- 239000012528 membrane Substances 0.000 title claims abstract description 52
- 150000001721 carbon Chemical class 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 53
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 53
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 239000013078 crystal Substances 0.000 claims abstract description 3
- 239000004744 fabric Substances 0.000 claims description 27
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 229920000742 Cotton Polymers 0.000 claims description 21
- 238000002791 soaking Methods 0.000 claims description 12
- 230000003647 oxidation Effects 0.000 claims description 10
- 238000007254 oxidation reaction Methods 0.000 claims description 10
- 238000001354 calcination Methods 0.000 claims description 8
- 238000011068 loading method Methods 0.000 claims description 8
- 229910021580 Cobalt(II) chloride Inorganic materials 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000012298 atmosphere Substances 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 4
- 239000012498 ultrapure water Substances 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 28
- 229910001868 water Inorganic materials 0.000 abstract description 28
- 238000001704 evaporation Methods 0.000 abstract description 15
- 230000008020 evaporation Effects 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 11
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 239000003575 carbonaceous material Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 11
- 230000008859 change Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000003763 carbonization Methods 0.000 description 4
- 229920000049 Carbon (fiber) Polymers 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000004917 carbon fiber Substances 0.000 description 3
- 238000009990 desizing Methods 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 238000000967 suction filtration Methods 0.000 description 3
- 229910052724 xenon Inorganic materials 0.000 description 3
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- CODVACFVSVNQPY-UHFFFAOYSA-N [Co].[C] Chemical compound [Co].[C] CODVACFVSVNQPY-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28033—Membrane, sheet, cloth, pad, lamellar or mat
- B01J20/28038—Membranes or mats made from fibers or filaments
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/027—Compounds of F, Cl, Br, I
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28011—Other properties, e.g. density, crush strength
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3028—Granulating, agglomerating or aggregating
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
- B01J20/3204—Inorganic carriers, supports or substrates
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3214—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the method for obtaining this coating or impregnating
- B01J20/3225—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the method for obtaining this coating or impregnating involving a post-treatment of the coated or impregnated product
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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
- C02F1/043—Details
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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- 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
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- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Inorganic Fibers (AREA)
Abstract
The invention discloses a cobalt-modified carbon-based fiber film, which comprises a carbon-based fiber film with a groove structure on the surface and cobalt chloride loaded on the surface of the carbon-based fiber film, wherein a cobalt chloride crystal loaded on the surface of the carbon-based fiber film grows in a longitudinal epitaxial mode. The invention also discloses a preparation method of the cobalt-modified carbon-based fiber membrane. Compared with the existing carbon material, the cobalt-modified carbon-based fiber membrane has excellent moisture absorption performance under the synergistic effect of cobalt chloride and the carbon-based fiber membrane, and the moisture absorption amount is up to 5.19g g under the condition that the ambient humidity RH is 96-98%‑1(ii) a In addition, photothermal conversion thereofThe efficiency reaches up to 90 percent, the water evaporation performance is excellent under the drive of 1 sunlight, and the evaporation rate reaches 1.65kg/m2The evaporation efficiency reaches 76.6%, and the material can realize solar-driven water evaporation through high photo-thermal conversion efficiency, namely the application of heat collection and water production.
Description
Technical Field
The invention relates to a cobalt-modified carbon-based fiber membrane and a preparation method of the cobalt-modified carbon-based fiber membrane.
Background
In recent years, dehumidification techniques have attracted much attention, and a large amount of moisture accumulated in a high humidity environment is unfavorable for healthy and comfortable life, and thus a suitable moisture absorbent is required. Meanwhile, the technology which utilizes moisture absorbed and evaporated in the moisture absorption process to collect water in the atmosphere to generate fresh water so as to relieve global fresh water shortage is considered to be a technology with a very promising application prospect. Traditional moisture absorption materials include silica gel, MOF materials and the like, but the traditional moisture absorption materials have poor absorption kinetics, low water absorption rate and easy agglomeration. When the traditional membrane material is used as a moisture absorption material, although the traditional membrane material has a porous structure and is beneficial to moisture absorption, the mechanical property and the flexibility are limited, and most of the moisture absorption membrane materials are complicated in preparation process and high in cost. The carbon-based fiber has wide application in the field of solar energy conversion due to the characteristics of porosity, good mechanical property and excellent photo-thermal enhancement, but the inherent one-dimensional structure of the carbon-based fiber limits the photo-thermal conversion efficiency, thereby influencing the water evaporation performance.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems of various moisture absorption materials in the prior art, the invention provides a cobalt-modified carbon-based fiber membrane which not only has good mechanical property, but also has good water absorption property and photo-thermal conversion efficiency. The invention also provides a preparation method of the cobalt-modified carbon-based fiber membrane.
The technical scheme is as follows: the cobalt-modified carbon-based fiber film comprises a carbon-based fiber film with a groove structure on the surface and cobalt chloride loaded on the surface of the carbon-based fiber film, wherein cobalt chloride crystals loaded on the surface of the carbon-based fiber film grow in a longitudinal epitaxial mode.
Wherein the loading amount of cobalt chloride on the surface of the carbon-based fiber membrane is 30-35 wt%.
The preparation method of the cobalt-modified carbon-based fiber membrane comprises the following steps:
(1) boiling the sodium hydroxide solution with the cotton fabric, taking out the cotton fabric, and soaking the cotton fabric in ultrapure water for 1 night; the desizing treatment of the cotton fabric is realized;
(2) calcining the desized cotton fabric in a nitrogen atmosphere, and then performing oxidation treatment in an oxygen atmosphere to obtain a carbon-based fiber membrane; the carbon-based fiber film obtained after high-temperature carbonization and oxidation has excellent flexibility and can be folded and bent at will;
(3) soaking carbon-based fiber membrane in CoCl2Soaking in the solution for multiple times, and drying to obtain the CoCl-loaded carrier2Carbon-based fiber membrane of (2).
Wherein, in the step (1), the concentration of the sodium hydroxide solution is 15 g/L.
Wherein, in the step (2), the calcining temperature is 800 ℃, the calcining time is 1h, and the heating rate is 2 ℃/min.
Wherein, in the step (2), the oxidation temperature is 300 ℃, and the oxidation time is 2 h.
Wherein, in the step (3), CoCl2The concentration of the solution was 23.8 mg/mL.
Wherein, in the step (3), the drying temperature is 40 ℃, and the drying time is 2 h.
Has the advantages that: compared with the existing carbon material, the cobalt-modified carbon-based fiber membrane has excellent moisture absorption performance under the synergistic effect of cobalt chloride and the carbon-based fiber membrane, and the moisture absorption amount is up to 5.19gg under the condition that the environmental humidity RH is 96-98%-1(ii) a In addition, the photo-thermal conversion efficiency is up to 90%, the excellent water evaporation performance is shown under the driving of 1 sunlight, and the evaporation rate reaches 1.65kg/m2The evaporation efficiency reaches 76.6%, and the material can realize the application of solar drive water evaporation heat collection water production through high-efficiency photo-thermal conversion efficiency.
Drawings
FIG. 1 is a pictorial representation of a flexible cobalt-modified carbon-based fiber membrane of the present invention;
FIG. 2 is a scanning electron micrograph of a cobalt-modified carbon-based fiber film of the present invention;
FIG. 3 is a schematic view of the structure of the water absorbing device;
FIG. 4 is a graph showing the temperature change of a carbon-based fiber film and a cobalt-modified carbon-based fiber film obtained by the method of the present invention;
FIG. 5 is a diagram illustrating the mechanism of photothermal enhancement of a carbon-based fiber film produced by the method of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Example 1
The preparation method of the cobalt-modified Carbon-based fiber membrane (Co-Carbon) comprises the following steps:
(1) placing the waste cotton fabric in a sodium hydroxide solution with the concentration of 15g/L, heating to ensure that the sodium hydroxide solution boils for 1h, taking out the cotton fabric, and soaking the cotton fabric in ultrapure water for 1 night; the desizing treatment of the cotton fabric is realized;
(2) calcining the desized cotton fabric for 1h at 800 ℃ in a nitrogen atmosphere at the heating rate of 2 ℃/min, and oxidizing the calcined cotton fabric for 2h at 300 ℃ in an oxygen atmosphere to obtain a carbon-based fiber membrane; the carbon-based fiber film obtained after high-temperature carbonization and oxidation has excellent flexibility and can be folded and bent at will;
(3) cutting carbon-based fiber membrane into 6 × 6cm size, and soaking in 40mL of CoCl with concentration of 23.8mg/mL2In aqueous solution (CoCl)2The solution is prepared from CoCl2·H2O in water), by six repeated impregnations (by six repeated impregnations: soaking carbon-based fiber membrane in CoCl2In the water solution, after 20min, the carbon cloth is clamped out by tweezers, and then CoCl is put into the carbon cloth2Soaking in water solution for 20min, then clamping with forceps, repeating for six times, and adding carbon-based fiber membrane in CoCl2Soaking in aqueous solution for 2 hours, this operation enables a more adequate loading, because: such dynamic operation of the loading/adsorption sites of the carbon cloth without saturation promotes the absorption of cobalt by the carbon cloth, and such operation enables cobalt molecules to be first grown when the adsorption sites of the carbon cloth are saturatedSecondary growth is carried out on the basis of the length, and then the CoCl on the carbon cloth is improved2Loading amount of (1) and then dried at 40 ℃ for 2 hours to obtain a CoCl-loaded solid2Carbon-based fiber membrane of (1), CoCl in the carbon-based fiber membrane obtained in example 12The loading was 35 wt%.
The surface of the carbon-based fiber membrane after carbonization treatment has more folds, and the folds can effectively anchor cobalt chloride molecules and can regulate and control the oriented growth of the cobalt chloride molecules. The mechanism that the cobalt-modified carbon-based fiber film has good water absorption performance and photothermal conversion efficiency is as follows: the carbon-based fiber carbonized at the temperature of 800 ℃ basically only contains C element, the content of hydrophilic functional groups such as hydroxyl on the surface is lower, and the characteristic peak intensity of the hydroxyl is obviously enhanced after oxidation, which shows that the microcrystalline carbon edge of the fiber is oxidized and the hydrophilicity is enhanced after air activation, and after loading cobalt chloride, the hydroxyl on the surface of the cobalt-carbon-based fiber film is associated, so that the peak shape is widened; meanwhile, hydrogen bond combination is formed between the cobalt chloride and the carbon-based fiber, so that the hydrophilicity is further enhanced, on one hand, the moisture absorption performance of the fiber film in the air is enhanced by improving the hydrophilicity, on the other hand, the moisture absorption performance of the fiber film in the air is enhanced by forming cobalt chloride molecules similar to antenna structures on the surface of the carbon-based fiber film to capture water molecules in the air and water, as shown in figure 2, after the cobalt chloride is loaded on the carbon-based fiber film, a heterogeneous structure with a plurality of dendritic morphologies can be obtained on the surface of the film, namely, the cobalt chloride is uniformly loaded on the surface of the carbon fiber film and is epitaxially grown in a dendritic structure, the light collection efficiency can be enhanced by multiple scattering of light while the specific surface area of the film is increased, in addition, as shown in figure 5, the gaps among the carbon fibers (holes of the fiber film) have unique slit hole structures, the slit hole structure can enable light rays to be continuously refracted in the holes, light collecting efficiency is further enhanced, meanwhile, the 'coil structures' formed in the slit hole structure enable light and heat to be effectively concentrated inside the coils, heat loss is reduced, and therefore light and heat conversion efficiency of the fiber membrane is effectively improved.
Moisture absorption performance test: cobalt-modified carbon base obtained in example 1The fiber membrane is placed in a closed moisture absorption device to absorb moisture, the moisture absorption device controls the humidity RH to be different humidities as shown in figure 3, the mass change of the sample is rapidly measured by using an electronic microbalance at intervals, and the water absorption E is calculated to be m2-m1/m1. Wherein m is2The mass m of the sample after absorbing water1Is the initial mass of the sample.
The results are shown in table 1, and the water absorption capacity of the cobalt-modified carbon-based fiber membrane after absorbing moisture in air for 10 hours reaches 5.19gg when the RH is 96-98%-1。
TABLE 1
In the process of realizing moisture absorption in the air, moisture is rapidly captured on the surface of the fiber membrane by cobalt chloride molecules of a moisture absorption material in an antenna form, small cobalt chloride molecules can be effectively anchored by rough wrinkles on the surface of the carbon-based fiber membrane, effective capillary force and a large number of moisture active sites are provided for the cobalt chloride to absorb water molecules, and the fiber membrane has excellent moisture absorption capacity due to the synergistic enhancement effect of the cobalt chloride molecules and the moisture active sites.
The fiber film is placed under the condition that the illumination intensity is 1kW/m2The film was continuously irradiated under a xenon lamp for half an hour, and the temperature change of the film surface was recorded by a thermal infrared imager. As shown in the bar graph of fig. 4, after half an hour, the surface temperature of the Carbon-based fiber film (Carbon) was increased from room temperature to 100.1 ℃, and the photothermal efficiency η was calculated to be 89.0%; in contrast, the surface temperature of the cobalt chloride-loaded carbon-based fiber membrane rose from room temperature to 100.3 ℃ and the photothermal efficiency η was calculated to be 90.1%. Enhancement of photothermal efficiency benefits from the unique pore structure of the fibers and the protruding dendritic morphology of the film surface. The dendritic structure of the film surface can enhance light collection efficiency by multiple scattering of light. In addition, the carbon fibers have unique slit hole structures, as shown in fig. 5, the slit hole can continuously refract light in the hole, the light collecting efficiency is greatly enhanced, and the formed coil structures effectively concentrate light and heat inside the coil, so that the light and heat are reducedLoss of heat.
The film after reaching the maximum water uptake was subjected to a solar driven water evaporation test: the film is heated to a strength of 1kW/m2The irradiation was performed under a xenon lamp, the rate of change of the water mass (v) was measured by an electronic microbalance and the evaporation efficiency (η) was calculated. The evaporation performance obtained as a result of the experiment is shown in table 2.
TABLE 2
Example 2
The preparation method of the cobalt-modified carbon-based fiber membrane comprises the following steps:
(1) placing the waste cotton fabric in a sodium hydroxide solution with the concentration of 15g/L, heating to ensure that the sodium hydroxide solution boils for 1h, taking out the cotton fabric, and soaking the cotton fabric in ultrapure water for 1 night; the desizing treatment of the cotton fabric is realized;
(2) calcining the desized cotton fabric for 1h at 800 ℃ in a nitrogen atmosphere at the heating rate of 2 ℃/min, and oxidizing the calcined cotton fabric for 2h at 300 ℃ in an oxygen atmosphere to obtain a carbon-based fiber membrane; the carbon-based fiber film obtained after high-temperature carbonization and oxidation has excellent flexibility and can be folded and bent at will;
(3) carbon-based fiber membranes were cut to a size of 1.8 x 1.8cm in 10mL of CoCl at a concentration of 23.8mg/mL2Carrying out suction filtration in the aqueous solution, drying for 2h at 40 ℃ after suction filtration to obtain the CoCl-loaded2Carbon-based fiber film of (1), CoCl in the carbon-based fiber film obtained in example 22The loading was 18.5 wt%.
Moisture absorption performance tests were performed under conditions of RH 96-98%:
the cobalt-modified carbon-based fiber membrane prepared in example 2 was placed in a closed moisture absorption device to absorb moisture, the humidity RH was controlled at 96-98%, the mass change of the sample was rapidly measured at intervals using an electronic microbalance, and the water absorption amount was calculated.
The results are shown in Table 3, and the cobalt-modified carbon-based fiber membrane surface CoCl prepared by the suction filtration method2The amount of the supported compound was decreased, resulting in a decrease in the moisture absorption effect as compared with example 1.
TABLE 3
The film after reaching the maximum water uptake was subjected to a solar driven water evaporation test: the film is heated to a strength of 1kW/m2The irradiation was performed under a xenon lamp, the rate of change of the water mass (v) was measured by an electronic microbalance and the evaporation efficiency (η) was calculated. The evaporation performance obtained as a result of the experiment is shown in table 4.
TABLE 4
Claims (8)
1. A cobalt-modified carbon-based fiber membrane characterized by: the carbon-based fiber film comprises a carbon-based fiber film with a groove structure on the surface and cobalt chloride loaded on the surface of the carbon-based fiber film, wherein a cobalt chloride crystal loaded on the surface of the carbon-based fiber film grows in a longitudinal direction in an epitaxial mode.
2. The cobalt-modified carbon-based fiber membrane according to claim 1, wherein: the loading amount of cobalt chloride on the surface of the carbon-based fiber membrane is 30-35 wt%.
3. A method of making the cobalt-modified carbon-based fiber membrane of claim 1, comprising the steps of:
(1) boiling the sodium hydroxide solution with the cotton fabric, taking out the cotton fabric, and soaking the cotton fabric in ultrapure water for 1 night;
(2) calcining the desized cotton fabric in a nitrogen atmosphere, and then performing oxidation treatment in an oxygen atmosphere to obtain a carbon-based fiber membrane;
(3) soaking carbon-based fiber membrane in CoCl2Soaking in the solution for multiple times, and drying to obtain the CoCl-loaded carrier2Carbon-based fiber membrane of (2).
4. The method of making a cobalt-modified carbon-based fiber membrane of claim 3, wherein: in the step (1), the concentration of the sodium hydroxide solution is 15 g/L.
5. The method of making a cobalt-modified carbon-based fiber membrane of claim 3, wherein: in the step (2), the calcining temperature is 800 ℃, the calcining time is 1h, and the heating rate is 2 ℃/min.
6. The method of making a cobalt-modified carbon-based fiber membrane of claim 3, wherein: in the step (2), the oxidation temperature is 300 ℃, and the oxidation time is 2 h.
7. The method of making a cobalt-modified carbon-based fiber membrane of claim 3, wherein: in step (3), CoCl2The concentration of the solution was 23.8 mg/mL.
8. The method of making a cobalt-modified carbon-based fiber membrane of claim 3, wherein: in the step (3), the drying temperature is 40 ℃, and the drying time is 2 hours.
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