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WO2017201096A1 - Dispositif d'adsorption d'humidité à base d'oxyde de graphène - Google Patents

Dispositif d'adsorption d'humidité à base d'oxyde de graphène Download PDF

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Publication number
WO2017201096A1
WO2017201096A1 PCT/US2017/032973 US2017032973W WO2017201096A1 WO 2017201096 A1 WO2017201096 A1 WO 2017201096A1 US 2017032973 W US2017032973 W US 2017032973W WO 2017201096 A1 WO2017201096 A1 WO 2017201096A1
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WIPO (PCT)
Prior art keywords
moisture
containment structure
adsorbing device
graphene oxide
oxide material
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Ceased
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PCT/US2017/032973
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English (en)
Inventor
Rebecca ROMERO
Shijun Zheng
Peng Wang
Sheng Li
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Nitto Denko Corp
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Nitto Denko Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/261—Drying gases or vapours by adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/28—Selection of materials for use as drying agents
    • 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
    • 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
    • B01J20/205—Carbon nanostructures, e.g. nanotubes, nanohorns, nanocones, nanoballs
    • 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
    • B01J20/2805—Sorbents inside a permeable or porous casing, e.g. inside a container, bag or membrane
    • 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
    • B01J20/28054—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 surface properties or porosity
    • B01J20/28057—Surface area, e.g. B.E.T specific surface area
    • 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
    • B01J20/34—Regenerating or reactivating
    • B01J20/3416—Regenerating or reactivating of sorbents or filter aids comprising free carbon, e.g. activated carbon
    • 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
    • B01J20/34—Regenerating or reactivating
    • B01J20/3483—Regenerating or reactivating by thermal treatment not covered by groups B01J20/3441 - B01J20/3475, e.g. by heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0407—Constructional details of adsorbing systems
    • B01D53/0415—Beds in cartridges

Definitions

  • the present embodiments relate to devices comprising a graphene or graphene oxide material for air treatment and dehumidification.
  • desiccants are one of the primary methods for removing excess moisture and environmental control.
  • desiccants are also used in air conditioning applications where the humidity must be controlled or where it is manipulated such as in evaporate cooling, where the moisture is removed and then the temperature reduced by the reintroduction and evaporation of water.
  • Solid desiccants can comprise calcium sulfate, molecular sieves (i.e. synthetic zeolite), montmorillonite clay, calcium oxide, and silica.
  • molecular sieves i.e. synthetic zeolite
  • montmorillonite clay i.e. calcium oxide
  • silica i.e. calcium oxide
  • the performance of these desiccants tapers in high relative humidity conditions.
  • liquid desiccants include aqueous solutions of lithium chloride, calcium chloride, lithium bromide, triethylene glycol, seawater bitterns, MgCI 2 , KCOOH, glycols like triethylene glycol (TEG), diethylene glycol (DEG), MEG, propylene glycol, and mixtures thereof.
  • solid desiccants are preferred because of their smaller form factor and lesser propensity for corrosion.
  • Graphene materials such graphene oxide, reduced graphene oxide, or functionalized derivatives thereof, may be used to reduce water vapor content or humidity in a gas (e.g. air).
  • the graphene materials may be effective in removing moisture over a broad range of external humidity.
  • Some embodiments can include a moisture-adsorbing device comprising: a containment structure; and a drying graphene oxide material held in the containment structure.
  • the containment structure can be permeable to water vapor.
  • the containment structure can comprise a moisture barrier.
  • the graphene oxide material can be pre-dehydrated.
  • Some devices can have the graphene oxide material containing less than about 10% water by weight.
  • the graphene oxide material can comprise a loose powder.
  • the graphene oxide material can comprise a porous lattice.
  • the moisture-adsorbing device can further comprise a moisture indicating material that changes color when the graphene is at least 90% saturated with water.
  • the moisture indicating material can be only exposed to the environment inside the containment structure.
  • Some containment structures can comprise a transparent polymer.
  • Some devices can further comprise a protective seal that reduces the amount of water vapor entering the containment structure during storage, and wherein the protective seal is configured to be broken or removed before use.
  • Some embodiments can include a dry enclosure device comprising: a moisture adsorbing device described herein, an orifice in the containment structure, wherein the containment structure is a barrier to the entry of moisture; and a door that: 1) provides a barrier to the entry of moisture across the orifice when closed to create an internal dry environment, and 2) allows items to be placed inside the containment structure when open.
  • Some embodiments can include method of removing moisture comprising: (1) exposing a moisture-adsorbing device described herein to a control volume, and (2) allowing the exposed device to remove water vapor from the control volume.
  • the method can further comprise: (1) removing the moisture-adsorbing device once it has reached a desired level of saturation; (2) regenerating the moisture-adsorbing device by applying heat or reduced pressure; (3) re-exposing the regenerated device to the control volume; and (4) repeating as necessary to reduce moisture in the control volume
  • Some embodiments can include a method of removing moisture from the internal dry environment of a dry enclosure device described herein, the method comprising: (1) closing the door of the moisture-adsorbing device over the orifice to seal the moisture impermeable containment structure; (2) allowing the graphene oxide material to remove water vapor from the internal dry environment. Some methods can further comprise inserting an object into the internal dry environment to maintain or increase the dryness of the object.
  • FIG. 1 is a schematic of an embodiment of a moisture-adsorbing device.
  • FIG. 2 is a schematic of an embodiment of a dry enclosure device.
  • FIG. 3 is a schematic of a possible embodiment of a moisture adsorbing device described herein; this embodiment is an example that has a transparent window and a moisture permeable orifice with a protective cover covering the orifice, with moisture indicating material mixed amongst the graphene oxide powder.
  • FIG. 4 is a schematic of another possible embodiment of a moisture adsorbing device with the moisture indicating material placed in physical communication with the transparent window.
  • FIG. 5 is a schematic of a possible embodiment of a dry enclosure device containing the graphene oxide powder which allows for the moisture controlled internal environment.
  • FIG. 6 is a graph showing the moisture capacity of various desiccants versus graphene oxide (GO) desiccants.
  • a moisture-adsorbing device related to this disclosure e.g. moisture-adsorbing device 10 in FIG. 1 , includes a containment structure, such as containment structure 20, and a graphene oxide material, such as graphene oxide material 30, which is held in the containment structure.
  • the volume inside the containment structure contains only gas and/or solid matter.
  • a moisture-adsorbing device can take two basic forms.
  • the moisture-adsorbing device dries something outside of the containment structure, and the graphene oxide material is contained within the structure.
  • the graphene oxide material draws moisture from outside the containment structure.
  • the external drying device can be something outside of the containment structure. In such a device, some or part of the containment structure should be permeable to water vapor.
  • the external drying device may be used in a method of removing moisture. This method comprises exposing the external drying device to a control volume, and allowing the external drying device to remove water vapor from the control volume. Once the external drying device has reached a desired level of saturation, it may be removed from the control volume. The external drying device may then be regenerated by applying heat or reduced pressure, and again exposing the external drying device to the control volume. This process may be repeated as necessary to reduce moisture in the control volume.
  • This method may be used, for example, to provide continuous humidity control (e.g. for a room, a closet, a cabinet, or other enclosure).
  • the moisture adsorbing device dries something that is inside the containment structure.
  • both the graphene oxide and the thing being dried are inside of the containment structure.
  • the containment structure will be a barrier to the entry of water, and has an orifice.
  • a dry enclosure device further comprises a door that: 1) provides a barrier to the entry of moisture across the orifice when closed to create an internal dry environment (such as a dry gas inside the containment structure), and 2) allows items to be placed inside the containment structure when open.
  • FIG. 2 depicts an example of an embodiment of a dry enclosure device.
  • dry enclosure device 40 includes a containment structure, such as containment structure 50, and a graphene oxide material, such as graphene oxide material 30, which is held in the containment structure, an orifice, such as orifice 60, in a wall of the containment structure, and a door, such as door 70 which can provide access to the interior of the containment structure (e,g, containment structure 50) through the orifice (such as orifice 60).
  • An object, such as object 80 can be dried by closing the door (such as door 70).
  • the containment structure may be any structure in which the graphene oxide material can be contained.
  • the containment structure is permeable to water vapor.
  • some part, or all, of the containment structure is composed of a material that is permeable to water vapor. In some embodiments, about 1 - 10%, about 10-30%, about 30-50%, about 50-70%, about 70-90%, or about 90-100% of the area of the containment structure is permeable to water vapor.
  • a water permeable portion of a containment structure may have any structure that provides water permeability such as a microporous structure, e.g. a microporous mesh structure; a woven structure; a non-woven structure; etc.
  • a microporous structure e.g. a microporous mesh structure; a woven structure; a non-woven structure; etc.
  • a water permeable containment structure or a water permeable portion of a containment structure may comprise, or be composed of, any suitable material.
  • a suitable material could be an organic material, such as cellulose or paper, or a polymer.
  • a hydrophilic polymer may allow the material to be permeable to water vapor. Examples of useful hydrophilic polymers include: polyvinyl alcohol) (PVA), polyamide (e.g.
  • Nylon, Nylon- 6, etc. polyvinyl butyral (PVB), poly(methyl vinyl ether), polyethylenimine (PEI), polymethacrylate (PMA), poly methyl methacrylate (PMMA); poly(N-isopropylacrylamide) (PNIPAM), polyacrylamide (PAM), polyacrylonitrile (PAN), poly(acrylic acid) (PAA), poly(ethylene glycol) (PEG), poly(ethylene oxide) (PEO), poly(vinylpyrrolidone) (PVP), polyelectrolytes, poly(styrenesulfonate) (PSS), polyacrylamide (PAM), polyallylamine, polyurethane, polyethylene terephthalate (PET), and/or combinations thereof.
  • PVB polyvinyl butyral
  • PI polyethylenimine
  • PMA polymethacrylate
  • PMMA polymethyl methacrylate
  • PIPAM poly(N-isopropylacrylamide)
  • PAM polyacryl
  • a polyolefin polymer may also be useful in a water permeable containment structure as well.
  • Examples may include polyethylene (PE), high density polyethylene (HDPE) (e.g. Tyvek), polypropylene (PP), polymethylpentene (PMP), polybutene-1 (PB-1), polyisobutylene (PIB), ethylene propylene rubber (EPR), ethylene propylene diene monomer (M-class) rubber (EPDM rubber).
  • the containment structure comprises a moisture barrier so that, when the graphene oxide material adsorbs water inside the containment structure, the air or gas inside the containment structure remains drier than the air or gas outside of the containment structure.
  • the moisture barrier may reduce the passage of water through the containment structure (as compared to a similar structure that is fully water permeable) by least: about 50%, about 60%, about 70%, about 80%, about 90%, about 95%, or about 99%.
  • a moisture barrier may be provided by including a material that resists the passage of water through the material (referred to herein as a "moisture barrier material"), such as a metal (e.g. coated steel, stainless steel, aluminum, etc.), a non-metal (e.g. a polymer) or a combination of both (e.g. a coated metal).
  • a moisture barrier material such as a metal (e.g. coated steel, stainless steel, aluminum, etc.), a non-metal (e.g. a polymer) or a combination of both (e.g. a coated metal).
  • polymers that resist the passage of water include cellulose derivatives, polytetrafluoroethylene (PTFE, or Teflon), polyester, polyether, polyolefins, polyvinyl alcohol) (PVA), polyvinyl butyral (PVB), polyvinyl chloride (PVC), polyvinyl acetate (PVAc), polyacrylonitrile, ethylene vinyl alcohol (EVOH), poly(methyl vinyl ether), polyethylenimine (PEI), polymethacrylate (PMA), poly methyl methacrylate (PMMA); vinyl chloride-acetate, poly(N-isopropylacrylamide) (PNIPAM), polyacrylamide (PAM), poly(2-oxazoline), poly(acrylic acid) (PAA), poly(tert-butyl acrylate), poly(sulfopropyl acrylate), poly(ethylene glycol), poly(ethylene oxide), poly(vinylpyrrolidone) (PVP), polyelectrolytes, poly(styrenesulf
  • a door of a containment structure may comprise any material that can provide a moisture barrier, such as the materials listed in the paragraph above.
  • a containment structure can include a transparent material, such as a transparent polymer.
  • a containment structure may be fully transparent, fully opaque, or be opaque with a transparent window of a different material.
  • any suitable graphene material or graphene oxide material may be used in a moisture-adsorbing device, such as graphene, graphene oxide (GO), reduced graphene oxide (RGO), or graphene oxide that is otherwise functionalized.
  • a graphene or graphene oxide material may be in any suitable form, such as a loose powder or a porous lattice.
  • the graphene oxide powder can be in the form of sheets, planes or flakes.
  • a graphene oxide powder can have a surface area of between about 100 m 2 /g to about 5000 m 2 /g.
  • the graphene oxide powder can have a surface area of about 150 m 2 /g to about 4000 m 2 /g. In some embodiments the graphene oxide powder can have a surface area of about 200 m 2 /g to about 1000 m 2 /g, e.g., about 400 m 2 /g to about 500 m 2 /g.
  • a drying graphene or graphene oxide material includes a graphene or graphene oxide material that has a sufficiently low moisture content to adsorb moisture from a gas in contact with the graphene oxide material in the conditions in which a moisture adsorbing device is used.
  • the graphene or graphene oxide material may contain less than about 30%, about 20%, about 10%, about 5%, about 1 %, or about 0.1 % water by weight.
  • the graphene or graphene oxide material may remove water from its surroundings without a flow of gas or liquid through the graphene or graphene oxide material. In some embodiments, embodiments the water is not removed by a filtration or passing water through the graphene or graphene oxide material.
  • the water flux, or alternatively the total flux (or flux of all fluids) through the graphene or graphene oxide material is less than about 20 gm "2 h “1 , about 10 gm “2 h “1 , about 5 gm “2 h “1 , about 2 gm “2 h “1 , or about 1 gm “2 h “1 .
  • the graphene or graphene oxide material is pre- dehydrated.
  • the graphene or graphene oxide material may be pre-dehydrated by applying heat (e.g.
  • a moisture-adsorbing device can optionally include a moisture indicating material to indicate the presence of moisture, or alternatively when the graphene is unable to sufficiently remove moisture.
  • the moisture indicating material changes color when the graphene is at least 70%, at least 75%, at least 80%, at least 85%, or at least 90% saturated.
  • the moisture indicating material can be only exposed to the environment inside the containment structure. In some embodiments, the moisture indicating material is shielded from the environment outside the containment structure.
  • any suitable material that changes appearance in the presence of moisture may be used as a moisture indicating material.
  • Some examples include cobalt chloride, VOCI 3 , Cu and Br with a dye, CaCI 2 , or an organic indicator.
  • the dye can be a xanthene-type dye, an azine-type dye, a thiazine-type dye or a triarylmethane dye.
  • the indicator is embedded within the graphene powder, as shown in FIG. 3.
  • the containment structure can include a clear window so that the moisture indicating material, or an object to be dried in the containment structure, can be readily observed.
  • a moisture-adsorbing device further may further comprise a protective seal that precludes water vapor from entering the containment structure during storage.
  • the protective seal can be configured to be broken or removed before use.
  • the protective seal may include any moisture barrier material.
  • the protective seal can comprise a coated membrane.
  • FIG. 3 Some moisture adsorbing devices may be represented by FIG. 3.
  • moisture adsorbing device 100 comprises containment structure 110 and graphene oxide powder 120.
  • Moisture adsorbing device may also optionally comprise humidity indicator 130, which is indicator placed inside the containment structure. Humidity indicator 130 may be used to indicate when the graphene oxide is nearing capacity of adsorption.
  • containment structure 110 can also comprise viewing window 113, which allows the indicator to be viewed.
  • viewing window 113 Another optional feature of moisture adsorbing device 100 is orifice 111 , which can be covered by water permeable material 112, so that moisture can enter the containment structure from the external environment while excluding other contaminants.
  • Moisture adsorbing device 100 device may also optionally comprise protective seal 140, which covers orifice 111 and seals the graphene from the environment until ready to be used.
  • FIG. 3 also applies to FIG. 4, which is included to show how the indicator can be mounted inside the containment structure and in physical communication with the viewing window so that the indicator can be readily viewed.
  • a dry enclosure device 200 includes containment structure 110, graphene oxide powder 120, and door 210.
  • Door 210 can optionally comprise seal 211 to create a moisture tight seal when the door is closed.
  • Dry enclosure device 200 can also optionally comprise clear window 212, to allow the contents and desiccant to be viewed.
  • clear window 212 can be part of door 210.
  • the device may also comprise a humidity indicator, 130, the indicator placed inside the containment structure which indicates when the graphene oxide is nearing capacity of adsorption.
  • the viewing window allows the indicator to be viewed.
  • a moisture-adsorbing device comprising:
  • Embodiment 2 a drying graphene oxide material held in the containment structure.
  • Embodiment 2 The moisture-adsorbing device of embodiment 1 , wherein the containment structure is permeable to water vapor.
  • Embodiment 3 The moisture-adsorbing device of embodiment 1 , wherein the containment structure comprises a moisture barrier.
  • Embodiment 4 The moisture-adsorbing device of embodiment 1 , 2, or 3, wherein the graphene oxide material is pre-dehydrated. Embodiment s. The moisture-adsorbing device of embodiment 1 , 2, 3, or 4, wherein the graphene oxide material contains less than about 10% water by weight. Embodiment 6. The moisture-adsorbing device of embodiment 1 , 2, 3, 4, or 5, wherein the graphene oxide material comprises a loose powder.
  • Embodiment 7 The moisture-adsorbing device of embodiment 1 , 2, 3, 4, 5, or
  • the graphene oxide material comprises a porous lattice.
  • Embodiment 8 The moisture-adsorbing device of embodiment 1 , 2, 3, 4, 5, 6, or 7, wherein the moisture-adsorbing device further comprises a moisture indicating material that changes color when the graphene is at least 90% saturated with water.
  • Embodiment 9. The moisture-adsorbing device of embodiment 8, wherein the moisture indicating material is only exposed to the environment inside the containment structure.
  • Embodiment 10 The moisture-adsorbing device of embodiment 1 , 2, 3, 4, 5, 6,
  • Embodiment 11 The moisture-adsorbing device of embodiment 1 , 2, 3, 4, 5, 6,
  • the moisture-adsorbing device further comprises a protective seal that reduces the amount of water vapor entering the containment structure during storage, and wherein the protective seal is configured to be broken or removed before use.
  • a dry enclosure device comprising:
  • a door that: 1 ) provides a barrier to the entry of moisture across the orifice when closed to create an internal dry environment, and 2) allows items to be placed inside the containment structure when open.
  • Embodiment 13 A method of removing moisture comprising:
  • Embodiment 14 The method of embodiment 13, further comprising:
  • Embodiment 15 A method of removing moisture from the internal dry environment of the dry enclosure device of embodiment 12, the method comprising:
  • Embodiment 16 The method of embodiment 15, further comprising inserting an object into the internal dry environment to maintain or increase the dryness of the object.
  • Graphene Oxide was prepared from graphite using the modified Hummers method.
  • 2.0 g of Graphite flakes (Sigma Aldrich, St. Louis, MO, USA, 100 mesh) was oxidized in a mixture of 2.0 g NaN0 3 (Aldrich), 10 g KMn0 4 (Aldrich) and 96 mL of concentrated H 2 S0 4 (Aldrich, 98%) at 50 °C for 15 hours; then the resulting paste mixture was poured into 400 g of ice following by adding 30 mL of hydrogen peroxide (Aldrich, 30%). The resulting solution was then stirred for 2 hours to reduce the manganese dioxide, then filtered through filter paper and washed with Dl water.
  • the resulting solid was then collected and dispersed in Dl water by stirring, then centrifuged at 6300 rpm for 40 min, and the aqueous layer was decanted. The remaining solid was collected by filtration and drying in VWR 1400E vacuum oven (VWR International, Radnor, PA) at 60 °C for 48 hours to give dehydrated GO, a black solid.
  • VWR 1400E vacuum oven VWR International, Radnor, PA
  • the containment device For the preparation of the containment device either commercially available GO or synthesize GO can be used or graphene oxide can be used. Three devices were created according to parameters specified in Table 1 . To create the device the graphene oxide was placed in a 60 mL vial. If the graphene was not dehumidified, it was dried in a VWR 1400E vacuum oven (VWR International, Radnor, PA) at 105 °C to 1 10 °C for overnight, or approximately 16 hours, to ensure proper dehydration. The resulting devices were then kept in a dry environment until ready for testing.
  • VWR 1400E vacuum oven VWR International, Radnor, PA
  • Table 1 Devices According to GO Source.
  • the desiccant device was examined to determine its adsorption characteristics. First, the weight of the device was determined before exposing it to the environment. Then, the device was placed in a controlled environmental chamber (Model #5518, Electro-Tech Systems, Inc. , Glenside, PA, USA) at a relative humidity of 25% at a temperature of 25 °C such that the dehydrated GO was exposed to the environment of the chamber. Then, the device was allowed to reach equilibrium for about 6 hours. The desiccant device was then removed and then promptly weighed to determine the amount of water adsorbed.
  • a controlled environmental chamber Model #5518, Electro-Tech Systems, Inc. , Glenside, PA, USA

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  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

L'invention concerne un dispositif d'adsorption d'humidité à base d'oxyde de graphène qui offre une capacité améliorée d'adsorption de vapeur d'eau par rapport à celle des absorbeurs d'humidité traditionnels. Une première forme comprend un dispositif de séchage externe qui permet de sécher quelque chose à l'extérieur d'une structure de contention, qui est perméable à la vapeur d'eau. Une deuxième forme comprend un dispositif de contention sec qui permet de sécher quelque chose se trouvant à l'intérieur de la structure de contention, qui comprend une barrière contre l'humidité.
PCT/US2017/032973 2016-05-16 2017-05-16 Dispositif d'adsorption d'humidité à base d'oxyde de graphène Ceased WO2017201096A1 (fr)

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WO2019213373A1 (fr) * 2018-05-02 2019-11-07 Nitto Denko Corporation Élément d'oxyde de graphène sélectivement perméable

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CN104383794A (zh) * 2014-11-19 2015-03-04 东莞市青麦田数码科技有限公司 一种化学干燥剂及其制备方法

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WO2019213373A1 (fr) * 2018-05-02 2019-11-07 Nitto Denko Corporation Élément d'oxyde de graphène sélectivement perméable
AU2019263389B2 (en) * 2018-05-02 2022-05-19 Nitto Denko Corporation Selectively permeable graphene oxide element

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