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Nano microcrystalline cellulose enhanced polyvinyl alcohol forward osmosis membrane as well as preparation method and application thereof

A technology of polyvinyl alcohol and nano-crystals, applied in the field of composite membranes, can solve problems such as poor heat resistance, achieve the effects of easy operation, easy biodegradation, and improved water flux and salt rejection rate

Active Publication Date: 2015-04-08
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existence of a large number of hydroxyl groups in polyvinyl alcohol also leads to its shortcomings such as water resistance and poor heat resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of the nano-microcrystalline cellulose-reinforced polyvinyl alcohol forward osmosis membrane of this embodiment, the specific preparation steps are as follows:

[0036] (1) Dissolve 30 parts by weight of polyvinyl alcohol (1788 low-viscosity type) in 540 parts by weight of deionized water, heat and stir to form a uniform and transparent solution, then add 0.6 parts by weight of auxiliary glycerin, and stir for 3 hours at 25°C , To form a uniform and stable polyvinyl alcohol solution;

[0037] (2) Add 10 parts by weight of nano-microcrystalline cellulose powder to the solution in step (1), stir for 2h to form a uniform and stable polyvinyl alcohol-nano-microcrystalline cellulose casting solution, and leave the casting solution to degas for 24h stand-by;

[0038] (3) Coat the casting liquid in step (2) in a mold with a diameter of 5 cm to form a film with a thickness of 2 mm and evaporate water for 48 hours at room temperature to form a film;

[0039] (4) ...

Embodiment 2

[0042] The preparation method of the nano-microcrystalline cellulose-reinforced polyvinyl alcohol forward osmosis membrane of this embodiment, the specific preparation steps are as follows:

[0043] (1) Dissolve 30 parts by weight of polyvinyl alcohol (1788 low-viscosity type) in 540 parts by weight of deionized water, heat and stir to form a uniform and transparent solution, then add 0.6 parts by weight of auxiliary glycerin, and stir for 3 hours at 25°C , To form a uniform and stable polyvinyl alcohol solution;

[0044] (2) Add 12 parts by weight of nano microcrystalline cellulose powder to the solution in step (1), stir for 4 hours to form a uniform and stable polyvinyl alcohol-nano microcrystalline cellulose casting film, and leave the casting liquid to defoam for 24 hours stand-by;

[0045] (3) Coat the casting liquid in step (2) in a mold with a diameter of 5 cm to form a film with a thickness of 2 mm and evaporate water for 48 hours at room temperature to form a film;

[0046]...

Embodiment 3

[0050] The preparation method of the nano-microcrystalline cellulose-reinforced polyvinyl alcohol forward osmosis membrane of this embodiment, the specific preparation steps are as follows:

[0051] (1) Dissolve 30 parts by weight of polyvinyl alcohol (1788 low-viscosity type) in 540 parts by weight of deionized water, heat and stir to form a uniform and transparent solution, then add 0.6 parts by weight of auxiliary glycerin, and stir for 3 hours at 25°C , To form a uniform and stable polyvinyl alcohol solution;

[0052] (2) Add 15 parts by weight of nano-microcrystalline cellulose powder to the solution in step (1), stir for 3 hours to form a uniform and stable polyvinyl alcohol-nano-microcrystalline cellulose casting solution, and leave the casting solution to degas for 24 hours stand-by;

[0053] (3) Coat the casting liquid in step (2) in a mold with a diameter of 5 cm to form a film with a thickness of 2 mm and evaporate water for 48 hours at room temperature to form a film;

[...

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Abstract

The invention belongs to the technical field of a composite membrane, and discloses a nano microcrystalline cellulose enhanced polyvinyl alcohol forward osmosis membrane as well as a preparation method and application thereof. The preparation method of the forward osmosis membrane comprises the following steps: (1) dissolving the polyvinyl alcohol in deionized water, heating, stirring to form a uniform and transparent solution, adding additives, and stirring for uniformly dispersing the additives; (2) adding nano microcrystalline cellulose into the solution in the step (1), and uniformly stirring to form a stable membrane casting solution; (3) coating a mold with the membrane casting solution in the step (2), drying under the room temperature, and volatizing moisture to form a membrane; and (4) immersing the membrane formed in the step (3) into a glutaraldehyde solution, adding an additive into the solution to be subjected to cross-linking reaction, taking out the membrane, and drying the membrane to obtain the nano microcrystalline cellulose enhanced polyvinyl alcohol forward osmosis membrane. The forward osmosis membrane is high in strength, a supporting layer is not needed, the concentration polarization phenomenon in the application process of the positive osmosis membrane can be obviously reduced, and the water flux and the salt interception rate of the membrane can be increased.

Description

Technical field [0001] The invention belongs to the technical field of composite membranes, and specifically relates to a nanocrystalline cellulose reinforced polyvinyl alcohol forward osmosis membrane and a preparation method and application thereof. Background technique [0002] Forward osmosis is the use of the osmotic pressure difference on both sides of the membrane (instead of external pressure) as the driving force for the diffusion of water through the membrane to promote the net migration of water through the selective permeation membrane, which can be used to directly extract drinking water from sewage water. Compared with the membrane separation technology driven by external pressure, the most notable feature of forward osmosis membrane separation technology is that it does not require external pressure or runs under very low external pressure, and the membrane fouling is relatively light, and it can continue to operate for a long time without the need In recent years...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/38B01D69/12B01D67/00C02F1/44
Inventor 靳焘姜婷婷胡继文于发猛胡盛逾
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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