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Preparation method of self-supporting forward osmosis membrane based on chitosan

A forward osmosis membrane, chitosan technology, applied in semi-permeable membrane separation, chemical instruments and methods, osmotic/dialysis water/sewage treatment, etc., can solve the problem that the internal concentration polarization cannot be fundamentally eliminated

Active Publication Date: 2016-07-06
泉州蓝深环保研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the former direction can regulate the resistance of solutes in the porous layer by changing the structural parameters of the porous layer, it cannot fundamentally eliminate the influence of internal concentration polarization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Preparation of casting solution: Prepare chitosan aqueous solution with a mass fraction of 1%, magnetically stir for 7 hours, and add nano-silica particles to the chitosan aqueous solution after fully dissolving. The mass fraction of nano-silica in the solution is 0.5%, magnetically stirred for 7 hours to completely disperse the nano-silica particles in the chitosan aqueous solution, and let stand for 24 hours for degassing;

[0018] (2) Configuration of crosslinking agent solution: configure a crosslinking agent solution with a volume fraction of 1%, mix 99ml of absolute ethanol with 1ml of epichlorohydrin and stir until uniform; use potassium hydroxide with a mass fraction of 20% Solution Adjust the cross-linking agent solution to pH = 11, and store it away from light for later use;

[0019] (3) Preparation of forward osmosis membrane: fully soak and rinse the 200-mesh polyamide screen in 20% sodium hydroxide solution by mass fraction, and fully dry it at 50°C for...

Embodiment 2

[0022] (1) Preparation of casting solution: configure chitosan aqueous solution with a mass fraction of 5%, add nano-titanium dioxide particles after magnetic stirring for 7 hours to fully dissolve, stir for 7 hours to completely disperse nano-titanium dioxide particles in chitosan aqueous solution, and the concentration of nano-titanium dioxide in the solution The mass fraction is 0.05%, let it stand for 24h for degassing;

[0023] (2) Configuration of crosslinking agent solution: configure a crosslinking agent solution with a volume fraction of 5%, mix and stir 95ml ethylene glycol and 5ml epichlorohydrin to obtain a uniform epichlorohydrin ethylene glycol crosslinking agent solution , adjust the crosslinking agent solution to pH = 13.5 with a potassium hydroxide solution with a mass fraction of 50%, and store it in the dark until use;

[0024] (3) Preparation of forward osmosis membrane: soak and rinse the 100-mesh polypropylene screen in 50% sodium hydroxide solution, and ...

Embodiment 3

[0027] (1) Preparation of casting solution: Prepare a chitosan aqueous solution with a mass fraction of 3%, and after magnetically stirring for 7 hours to fully dissolve, add nano-graphene oxide and nano-titanium dioxide with a mass ratio of 1:1 to the chitosan aqueous solution, and nano-oxidized The total mass fraction of graphene and nano-titanium dioxide in the solution is 0.3%, magnetically stirred for 7 hours to make it completely dispersed in the chitosan aqueous solution, and left to stand for 24 hours for degassing;

[0028] (2) Configuration of crosslinking agent solution: configure a crosslinking agent solution with a volume fraction of 2.5%, mix and stir 97.5ml pentylene glycol and 2.5ml epichlorohydrin to obtain uniform epichlorohydrin pentanediol crosslinking agent solution, the crosslinking agent solution pH is adjusted to 14 with a mass fraction of 30% sodium hydroxide solution;

[0029] (3) Preparation of forward osmosis membrane: use 200-mesh ETFE screen to fu...

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Abstract

The invention discloses a preparation method of a self-supporting forward osmosis membrane based on chitosan. The preparation method comprises the following steps: (1) preparing a membrane casting solution; (2) preparing a cross-linking agent solution; and (3) preparing the forward osmosis membrane. The self-supporting forward osmosis membrane based on the chitosan, which is prepared by the invention, can be used for the fields including seawater desalting, municipal sewage treatment, food industry liquid concentration, outdoor emergency water supply and the like. The homogeneous forward osmosis membrane is directly prepared on a polyester screen mesh by adopting the chitosan as a membrane material, and effective separation of a selective separation layer and a porous supporting layer is realized; meanwhile, a screen mesh framework is used as the support so that the mechanical properties of the forward osmosis membrane are guaranteed; salt-water separation is realized by utilizing the cross-linked chitosan and an inner concentration polarization coefficient is close to 1, so that the influences on membrane osmosis properties by inner concentration polarization are eliminated to a certain extent and the aim of zero inner concentration polarization is basically realized; and the water flux of the forward osmosis membrane is about 40L / (m<3>.h), and is much better than that of an existing commercial forward osmosis membrane.

Description

technical field [0001] The invention belongs to the technical field of separation membrane preparation, in particular to a preparation method of a self-supporting forward osmosis membrane based on chitosan. Background technique [0002] As an emerging membrane separation technology, the early studies of forward osmosis technology mostly focused on potential applications in the fields of food engineering, water treatment and energy. Professor Elimelech of Yale University proposes to use NH 3 -CO 2 The driving fluid is regenerated with thermal energy to realize the production of pure water. This research has greatly stimulated the interest in forward osmosis technology in the academic and even industrial fields. The number of academic papers and patents in the following years has shown a linear growth trend. The future development trend of forward osmosis technology mostly focuses on: forward osmosis technology coupled with drive fluid regeneration technology, permeation and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/74B01D69/10B01D61/00B01D67/00C02F1/44
CPCY02A20/131B01D71/74B01D61/002B01D67/0006B01D69/10B01D2323/02B01D2323/30B01D2325/24C02F1/445
Inventor 高学理
Owner 泉州蓝深环保研究院有限公司
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