Preparation method of forward osmosis emergency drinking water bag prepared based on layer-by-layer self-assembly method

A layer-by-layer self-assembly and forward osmosis technology, applied in the field of environmental engineering, can solve the problems of residual and non-environmentally friendly organic solvents, and achieve the effects of improved separation performance, rich film-forming materials, and good taste

Active Publication Date: 2019-12-13
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

However, the water bag can only regulate the water purification rate through the concentration of the draw solution, and dimethylamide, methylpyrrolidone, 1,4-dioxane or acetone are used in the preparation process of the cellulose triacetate forward osmosis membrane and other toxic organic solvents, the film-making process is not environmentally friendly and organic solvents are easy to remain in the film-forming process

Method used

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  • Preparation method of forward osmosis emergency drinking water bag prepared based on layer-by-layer self-assembly method
  • Preparation method of forward osmosis emergency drinking water bag prepared based on layer-by-layer self-assembly method
  • Preparation method of forward osmosis emergency drinking water bag prepared based on layer-by-layer self-assembly method

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preparation example Construction

[0026] A method for preparing a forward osmosis emergency drinking water bag based on a layer-by-layer self-assembly method. The drinking water bag is made by sealing two forward osmosis membranes 1, and the water bag composed of forward osmosis membranes is filled with a draw liquid 3. The forward osmosis membrane is prepared by a layer-by-layer self-assembly method. The outer side of the water bag is the active layer 2 of the forward osmosis membrane, and the inner side of the water bag is the support layer 4, which is in contact with the drawing liquid. The specific method of the layer-by-layer self-assembly method of the forward osmosis membrane Proceed as follows:

[0027] (1) Preparation of layer-by-layer self-assembled forward osmosis membrane: configure cationic and anionic polyelectrolyte casting solutions, use ultrafiltration membranes as base membranes, cationic and anionic polyelectrolyte casting solutions as construction units, and adopt static alternating depositi...

Embodiment 1

[0038] Preparation of forward osmosis membrane: prepare 1% acetic acid solution containing 2g / L chitosan as cationic polyelectrolyte casting solution, use NaCl to adjust the salt background concentration of casting solution to 0.1mol / L; prepare 1g / L sodium alginate The aqueous solution is an anionic polyelectrolyte casting solution, and NaCl is used to adjust the background salt concentration of the casting solution to 0.1mol / L. With the polyethersulfone (PES) ultrafiltration membrane with a molecular weight cut-off of 20000 Daltons as the base membrane, the cationic and anionic polyelectrolyte casting liquids are used as the construction unit, and the layer-by-layer self-assembly method of static alternate deposition (dipping coating layer self-assembly Method) Six layers of polyelectrolyte were deposited on the active layer of ultrafiltration membrane.

[0039] Specifically, rinse the active layer protective solution of the basement membrane of the ultrafiltration membrane w...

Embodiment 2

[0045] Preparation of forward osmosis membrane: prepare 1% acetic acid solution containing 2g / L chitosan as cationic polyelectrolyte casting solution, adjust the salt background concentration of casting solution to 0.1mol / L with NaCl; prepare 2g / L sodium alginate The aqueous solution is an anionic polyelectrolyte casting solution, and NaCl is used to adjust the background salt concentration of the casting solution to 0.1mol / L. With the polyethersulfone (PES) ultrafiltration membrane with a molecular weight cut-off of 20000 Daltons as the base membrane, the cationic and anionic polyelectrolyte casting liquids are used as the construction unit, and the layer-by-layer self-assembly method of static alternate deposition (dipping coating layer self-assembly Method) Six layers of polyelectrolyte were deposited on the active layer of ultrafiltration membrane.

[0046] Specifically, rinse the active layer protective solution of the basement membrane of the ultrafiltration membrane wit...

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Abstract

The invention relates to a preparation method of a forward osmosis emergency drinking water bag prepared based on a layer-by-layer self-assembly method, wherein the drinking water bag is prepared by sealing two forward osmosis membranes, the water bag formed by the forward osmosis membranes is filled with an absorbing liquid, the forward osmosis membrane is prepared by using a layer-by-layer self-assembly method, the outer side of the water bag is a forward osmosis membrane active layer, and the inner side of the water bag is a support layer, and inwards contacts the absorbing liquid. According to the present invention, the drinking water meeting the drinking standard is prepared only by using the driving force provided by the transmembrane osmotic pressure difference, such that the methodis energy-saving and economic, the water production is stable on the premise of the effective interception of organic pollutants and heavy metal ions, and the water flux can achieve 1.7-3.5 L/(m<2>.h); and the method provides the safe and good-taste drinking water solution for terminal users in lack of material rescue and clean water sources in emergency situations such as natural disasters, accidental dangerous situations, field survival and the like, and can provide purified water meeting the national Standards For Drinking Water Quality (GB5749-2006).

Description

technical field [0001] The invention belongs to the field of environmental engineering and relates to forward osmosis membrane technology, in particular to a method for preparing a forward osmosis emergency drinking water bag based on a layer-by-layer self-assembly method. Background technique [0002] Water is an important natural resource and environmental element on which all life depends. Drinking water safety is directly related to people's physical and mental health and life safety. In emergency situations (natural disasters, accidental dangers, wild survival, etc.) that lack clean water sources, drinking water safety is even more important. Various emergency situations often face the situation of lack of energy supply. The technology of producing purified water without external driving force and on-site treatment highlights its own advantages. Users can easily obtain safety and taste without waiting for material rescue. Good drinking water. [0003] Forward osmosis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44B01D61/00B01D63/00B01D67/00B01D69/10C02F101/20C02F101/30
CPCB01D61/002C02F1/445B01D63/00B01D69/10B01D69/105B01D67/0002B01D2325/30C02F2101/30C02F2101/20
Inventor 刘磊杨照贤
Owner CHANGCHUN UNIV OF SCI & TECH
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