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Graphene enhanced photo-thermal evaporation membrane, membrane assembly and sewage concentration treatment device

An evaporation film and graphene technology, applied in water/sewage treatment, water/sludge/sewage treatment, permeation/dialysis water/sewage treatment, etc., can solve problems that are not conducive to water vapor escape and restriction, and avoid supply The effects of insufficient liquid, high specific surface area, and high solar absorption rate

Pending Publication Date: 2022-01-28
江苏巨之澜科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the patent CN113173577A discloses a graphene photothermal film with a double-layer structure. The graphene oxide solution is deposited on the substrate by vacuum filtration, coating or roll-to-roll process, and then the graphene oxide film is treated with a flash lamp. The surface layer of the surface layer is subjected to flash reduction to obtain a graphene photothermal film with a graphene layer with a three-dimensional pore structure and a graphene oxide layer with a two-dimensional layered structure; patent CN 109369065A discloses a foamed graphene photothermal material. Graphene dispersion liquid, sodium dodecylsulfonate, lauryl alcohol and resin glue are uniformly mixed, and then a binder is added, cast and freeze-dried to obtain a foamed graphene photothermal material. 2 The water evaporation efficiency under the intensity is only 1.13~1.25kg / (m 2 h); Subsequently, the patent CN 106809897A discloses a graphene light-to-heat conversion material for seawater desalination and purification, which mainly uses graphene powder and a polymer material of localized chain molecules to undergo a heat treatment process in a mold The graphene foam material is obtained, and the bottom is further hydrophilized, and it is floated on the surface of sea water or sewage for evaporation. Although the foam can be washed, only relying on capillary siphon water supply will greatly limit the evaporation efficiency.
In addition, the above photothermal materials are all modified by graphene oxide materials during use. Since graphene oxide itself has more hydroxyl groups, carboxyl groups and epoxy groups, the photothermal materials prepared are not It is conducive to the escape of water vapor, and is limited in the specific application of high-efficiency evaporation and concentration of sewage

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  • Graphene enhanced photo-thermal evaporation membrane, membrane assembly and sewage concentration treatment device
  • Graphene enhanced photo-thermal evaporation membrane, membrane assembly and sewage concentration treatment device
  • Graphene enhanced photo-thermal evaporation membrane, membrane assembly and sewage concentration treatment device

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preparation example Construction

[0045] The specific embodiment of the present invention provides a kind of graphene enhanced photothermal evaporation film, and its preparation method comprises:

[0046] (1) preparing graphene dispersion liquid: adding graphene material in the first organic solvent, ultrasonic dispersion 12~48h obtains graphene dispersion liquid, graphene material accounts for 0.2~20.0wt% of graphene dispersion liquid;

[0047] (2) Preparation of spinning casting solution: polymer powder is vacuum-dried at 40-90°C for 6-24h, dissolved in a second organic solvent to obtain a polymer solution, the polymer powder accounts for 16-24wt% of the polymer solution, and then Add the graphene dispersion liquid into the polymer solution in batches, then add the porogen, and stir at 80° C. for 12 to 72 hours to obtain the spinning casting solution; the porogen accounts for 0.5% of the spinning casting solution. ~10wt%; the volume ratio of the graphene dispersion to the polymer solution is 1:1~1:10.

[00...

Embodiment 1

[0054] Embodiment 1 A kind of graphene enhanced photothermal evaporation film, its preparation method is as follows:

[0055] (1) prepare graphene dispersion liquid: join graphene in the organic solvent N-methylpyrrolidone, ultrasonic dispersion 36h obtains graphene dispersion liquid, graphene accounts for 10wt% of graphene dispersion liquid;

[0056](2) Preparation of spinning casting solution: the polyvinylidene fluoride powder was vacuum-dried at 80° C. for 12 hours, dissolved in the organic solvent N-methylpyrrolidone to obtain a polymer solution, and the polyvinylidene fluoride powder accounted for 22 wt% of the polymer solution. Then the graphene dispersion is added to the polymer solution in batches (the volume ratio of the graphene dispersion to the polymer solution is 1:1), then PEG200 is added, and stirred for 48h at 80°C to obtain a spinning casting solution ; PEG200 accounts for the 5.0wt% of the spinning casting solution, and the spinning casting solution prepared...

Embodiment 2

[0059] Embodiment 2 A kind of graphene enhanced photothermal evaporation film, its preparation method is as follows:

[0060] (1) prepare graphene dispersion liquid: graphene is joined in the organic solvent N,N-dimethylacetamide, ultrasonic dispersion 12h obtains graphene dispersion liquid, graphene accounts for 0.2wt% of graphene dispersion liquid;

[0061] (2) Preparation of spinning casting solution: dry polyvinylidene fluoride powder under vacuum at 40°C for 24 hours, dissolve in organic solvent N,N-dimethylacetamide to obtain a polymer solution, polyvinylidene fluoride powder accounts for solution 16wt%, then the graphene dispersion was added in batches to the polymer solution (the volume ratio of the graphene dispersion to the polymer solution was 1:5), then PEG2000 was added, and stirred for 12h at 80°C to obtain a spinning Silk casting solution; PEG2000 accounts for 0.5wt% of the spinning casting solution;

[0062] (3) Preparation of graphene-enhanced photothermal ev...

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Abstract

The invention provides a graphene enhanced photo-thermal evaporation membrane, a membrane assembly and a sewage concentration treatment device. The graphene enhanced photo-thermal evaporation film is a hollow fiber film, graphene of a two-dimensional sheet structure is evenly distributed on the inner surface, the outer surface and the section of the photo-thermal evaporation film, the photo-thermal evaporation film is of a gradient ordered pore structure, the pore diameter of the photo-thermal evaporation film is decreased from the inner surface to the outer surface, and the average pore diameter of the photo-thermal evaporation film is less than 30 nm. Graphene with high strength, excellent hydrophobic property, photothermal conversion and heat-conducting property is used as a raw material, preparation of a photothermal modified material is realized through a one-step method, and a sewage concentration treatment device with high specific surface area and efficient photothermal conversion is designed, so that efficient solar energy driven photothermal evaporation concentration is realized.

Description

technical field [0001] The invention relates to the technical field of polymer membranes, in particular to a graphene-enhanced photothermal evaporation membrane, a membrane module and a sewage concentration treatment device. Background technique [0002] With the rapid development of economy and society, my country's sewage discharge is increasing year by year. Under the premise of limited total water resources, it is not advisable to simply develop new water resources. The solution to water resources is to increase revenue and reduce expenditure simultaneously. An effective approach to the shortage problem. It is imminent to effectively treat common wastewater produced in different fields, including agriculture, chemical industry, medicine, and even complex and highly toxic wastewater. Common wastewater concentration treatment methods include: membrane separation and concentration (ultrafiltration membrane concentration, nanofiltration membrane concentration, reverse osmosi...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D61/36B01D63/02B01D71/02B01D65/02C02F1/44C02F101/30C02F103/06C02F103/08C02F103/34
CPCB01D67/0093B01D61/36B01D63/02B01D63/023B01D71/021B01D65/02C02F1/448C02F2103/08C02F2103/343C02F2101/30C02F2103/06B01D2325/24B01D2325/30
Inventor 张晓红张清程
Owner 江苏巨之澜科技有限公司
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