High-performance Janus forward osmosis membrane and preparation method thereof

A forward osmosis membrane, high-performance technology, applied in the field of high-performance Janus forward osmosis membrane and its preparation, can solve the problems of internal concentration polarization, low water flux, high salt reverse diffusion flux, etc., to achieve high water Flux, membrane-making method is simple, and the effect of long service life

Active Publication Date: 2019-01-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, the problems existing in the prior art are: in the prior art, the forward osmosis composite membrane is mostly used to reduce the diffusion resistance of the permeate to increase the flux of the membrane. The internal concentration polarization problem occurs in the layer pores; at the same time, the existing forward osmosis composite membranes often have low water flux and high salt reverse diffusion flux

Method used

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  • High-performance Janus forward osmosis membrane and preparation method thereof
  • High-performance Janus forward osmosis membrane and preparation method thereof
  • High-performance Janus forward osmosis membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1). Dissolve polyvinylidene fluoride in triethyl phosphate at 60-100 o Stirring for 4-12 hours under C to make a film-forming precursor solution;

[0032] (2). Add 0.8g of azobisisobutyronitrile, 40g of N-vinylpyrrolidone, 30g of vinyltriethoxysilane, and 35g of triethyl phosphate into the film-forming precursor solution under a nitrogen or argon atmosphere. In-situ polymerization reaction, react for 6-48 hours, stop the gas atmosphere protection, expose the reaction to the air to terminate, obtain the casting solution after defoaming, and apply the obtained casting solution on the surface of the non-woven fabric through the film making process , to obtain the primary polymer film;

[0033] (3). Immerse the nascent film in 20-35 o The volume fraction of C is 40% in an aqueous solution of triethyl phosphate for 30 seconds to 5 minutes to complete the curing film formation and first crosslinking, then transfer to a warm water bath at 40-80°C, and continue to immerse fo...

Embodiment 2

[0039] (1). Dissolve polylactic acid in dimethylformamide at 75-125 o Stir for 5-72 hours under C to make a film-forming precursor solution;

[0040] (2). Add 1.0g dimethyl azobisisobutyrate, 48g N-vinylpyrrolidone, 35g vinyltrimethoxysilane, and 25g dimethylformamide to the film-forming precursor under nitrogen or argon atmosphere Carry out in-situ polymerization reaction in the solution, react for 6-48 hours, stop the gas atmosphere protection, expose the reaction to the air to terminate, obtain the casting solution after defoaming, and apply the obtained casting solution on the Spin the surface of the fabric to obtain a polymer primary film;

[0041] (3). Immerse the nascent film in 20-35 o The volume fraction of C is 50% in an aqueous solution of dimethylformamide for 30 seconds to 5 minutes to complete the curing film formation and first crosslinking, then transfer to a warm water bath at 40-80°C, and continue to immerse for 12-24 hours Complete the secondary cross-lin...

Embodiment 3

[0047] (1). Dissolve polysulfone in tripropyl phosphate at 75-125 o Stir for 5-72 hours under C to make a film-forming precursor solution;

[0048] (2). Add 1.2g dimethyl azobisisobutyrate, 50g N-vinylpyrrolidone, 34g vinyltriethoxysilane, and 28g tripropyl phosphate to the film-forming precursor under nitrogen or argon atmosphere Carry out in-situ polymerization reaction in the solution, react for 6-48 hours, stop the gas atmosphere protection, expose the reaction to the air to terminate, obtain the casting solution after defoaming, and apply the obtained casting solution on the Spin the surface of the fabric to obtain a polymer primary film;

[0049] (3). Immerse the nascent film in 20-35 o The volume fraction of C is 60% in tripropyl phosphate for 30 seconds to 5 minutes to complete the curing film formation and the first crosslinking, then transfer to a warm water bath at 40-80°C, and continue to immerse for 12-24 hours to complete the second time Cross-linking, after d...

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Abstract

The invention discloses a high-performance Janus forward osmosis membrane, comprising a first surface of a super-hydrophilic polymer microporous membrane, a polymer membrane matrix intermediate layerand a second surface away from the first surface and coated with a super-hydrophobic inorganic nanoparticle coating, wherein the water droplet infiltration time of the first surface of the super-hydrophilic polymer microporous membrane is less than two seconds, and the second surface coated with the super-hydrophobic inorganic nanoparticle coating has a water droplet contact angle of greater than150 degrees. The Janus forward osmosis membrane has the advantage of high water flux and low-salt reverse diffusion flux.

Description

technical field [0001] The invention belongs to the technical field of forward osmosis separation membranes, in particular to a high-performance Janus forward osmosis membrane and a preparation method thereof. Background technique [0002] Reverse osmosis technology is rapidly becoming a conventional water treatment technology because of its good water quality. However, the reverse osmosis process relies on high pressure as the driving force, which not only requires high energy consumption, but also easily leads to serious membrane fouling. As a new generation of low energy consumption, low pollution and sustainable water purification technology, forward osmosis membrane separation technology is expected to become a strong competitor of reverse osmosis technology. The forward osmosis process only relies on the natural osmotic pressure between the two phases, which is a spontaneous process, so it has energy-saving and environmental protection effects; its separation process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00B01D67/00B01D71/34B01D71/68B01D71/80
CPCB01D61/002B01D67/0002B01D67/0088B01D69/125B01D71/34B01D71/68B01D71/80B01D2323/02
Inventor 刘富周升华林海波
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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