Preparation method of graphene oxide base forward-osmosis membrane

A forward osmosis membrane, graphene-based technology, applied in the field of preparation of graphene oxide-based forward osmosis membrane, can solve the problems of large internal concentration polarization, weak interaction, low membrane strength, etc., to achieve high water flux, The effect of high mechanical strength and high salt rejection

Inactive Publication Date: 2015-11-11
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The organic forward osmosis membrane produced by the existing method has poor hydrophilicity, large internal concentration polarization, small permeation flux, low rejection rate and poor antibacterial property, low membrane strength, and poor practical performance
Inorganic nanoparticles have high surface energy and large specific surface area, which makes them prone to agglomeration, which has an adverse effect on the structure and performance of the hybrid membrane, and the interaction between the organic and inorganic phases is weak. The inorganic nanoparticles added during the long-term use of the membrane Nanoparticles are easy to lose, causing secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] step 1):

[0038] Add 0.1% graphene oxide and 5% polyethylene glycol to the container and stir at room temperature for 12 hours in advance, and then add 59% dimethyl ethyl alcohol in an ultrasonic field at 20 kHz and 30°C for 0.1 hour. Amide and 10% polysulfone were stirred and dissolved, the stirring temperature was 30°C, and the stirring time was 12 hours, and then placed statically at 30°C for 18 hours for defoaming; 1 hour in an ultrasonic field at 20 kHz and a temperature of 50°C , to obtain a polysulfone casting solution in which graphene oxide is uniformly dispersed;

[0039] Step (2):

[0040] Dissolving 0.05% α-cyclodextrin and 0.05% graphene oxide in distilled water, and ultrasonicating for 0.5 hours in an ultrasonic field at 20 kHz and a temperature of 25° C., to prepare a cyclodextrin / graphene oxide aqueous solution; Dissolve 0.05% of benzoyl chloride in n-hexane to prepare a solution of benzoyl chloride in n-hexane;

[0041] Step (3):

[0042] Use a 100...

Embodiment 2

[0047] step 1):

[0048]Add 1% graphene oxide and 8% ethylene glycol to the container and stir at room temperature for 24 hours in advance, and then add 90% dimethyl formaldehyde after ultrasonication for 5 hours in an ultrasonic field at 100 kHz and a temperature of 90 ° C. Amide and 30% polysulfone were stirred and dissolved, the stirring temperature was 100°C, and the stirring time was 24 hours, and then placed statically at 80°C for 36 hours for defoaming; 5 hours in an ultrasonic field at 100 kHz and a temperature of 90°C , to obtain a polysulfone casting solution in which graphene oxide is uniformly dispersed;

[0049] Step 2:

[0050] Dissolve 5% cyclodextrin mixture (1:1 α-cyclodextrin and β-cyclodextrin), 1% graphene oxide in distilled water and sonicate in an ultrasonic field at 100 kHz at 90 °C After 5 hours, prepare a cyclodextrin / graphene oxide aqueous solution; dissolve 5% of benzoyl chloride in n-hexane to prepare a solution of benzoyl chloride in n-hexane;

...

Embodiment 3

[0057] step 1):

[0058] Add 0.5% graphene oxide and 4% ethanol to the container and stir at room temperature for 18 hours in advance, and then add 80.8% dimethyl sulfoxide, 20% polysulfone was stirred and dissolved, the stirring temperature was 70°C, and the stirring time was 18 hours, and it was placed statically at 60°C for 27 hours for defoaming; it was acted in an ultrasonic field of 60 kHz and a temperature of 60°C for 3 hours to obtain Graphene oxide uniformly dispersed polysulfone casting solution;

[0059] Step (2):

[0060] Dissolving 0.3% γ-cyclodextrin and 0.6% graphene oxide in distilled water, and ultrasonicating in an ultrasonic field at 70 kHz and a temperature of 60°C for 3 hours, to prepare a cyclodextrin / graphene oxide aqueous solution; Dissolve 3% of benzoyl chloride in n-hexane to prepare a solution of benzoyl chloride in n-hexane;

[0061] Step (3): Use a 120 μm thick scraper to scrape the uniformly dispersed polysulfone casting solution on the non-wov...

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Abstract

The invention discloses a preparation method of a graphene oxide base forward-osmosis membrane. The preparation method includes the four steps that polysulfone membrane casting liquid even in dispersing of graphene oxide is prepared; a trimesoyl chloride hexane solution is prepared, wherein the mass percent of trimesoyl chloride is 0.05-5%; deionized water is used for removing the residual solution to obtain a polysulfone ultra-filtration bottom membrane; then the graphene oxide base forward-osmosis membrane is obtained. The prepared forward-osmosis membrane is high in mechanical strength, achieves solvent resistance and anti-polluting performance and has high water flux and a high salt retaining rate, the preparation method provides a new path for preparing the forward-osmosis membrane, and the forward-osmosis membrane can be used for the fields of first-aid water bags, plant protection boxes, sea water desalination, hard water softening and industrial waste water.

Description

technical field [0001] The utility model relates to a preparation method of a forward osmosis membrane, in particular to a preparation method of a graphene oxide-based forward osmosis membrane. Background technique [0002] FO (Forward Osmosis) technology is an osmosis-driven membrane process with low energy consumption, low pollution, and high recovery. It has realistic or potential application prospects in seawater desalination, wastewater treatment, energy generation, food processing, and drug concentration. However, the lack of efficient FO membrane materials greatly restricts the development of FO technology. The membrane materials currently used in the FO process all have an asymmetric structure, consisting of a thin selective separation layer and a porous support layer. In the FO process, there are both external concentration polarization and internal concentration polarization, especially the internal concentration polarization. As a result, the actual water flux of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D71/68B01D71/06B01D67/00
Inventor 薛立新赵秀兰张安将盛建芳潘惠凯
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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