An alcoholated go-sio 2 Preparation method of particle modified flat composite forward osmosis membrane

A forward osmosis membrane, go-sio2 technology, applied in chemical instruments and methods, semi-permeable membrane separation, membranes, etc., can solve the problems of difficulty in improving the strength of forward osmosis membrane, application limitations, etc., to enhance the antibacterial and anti-pollution performance, Improve the effect of easy agglomeration and enhance dispersion performance

Active Publication Date: 2019-07-23
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the easy agglomeration of graphene oxide and graphene, the strength of the forward osmosis membrane is not easy to improve, and its application is limited to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] A kind of alcoholated GO-SiO 2 A method for preparing a particle-modified flat composite forward osmosis membrane, comprising the following steps:

[0031] 1) GO-SiO 2 Preparation of granules:

[0032] Prepare a mixed solution with a concentration of 60-95wt% absolute ethanol and pure water, add 2-50 mg of graphene oxide powder to 1L of the mixed solution according to the mass ratio, and adjust the pH value to 8.0-9.0 to obtain an alkaline solution. Add 0.5~5mg tetraethyl orthosilicate dropwise into 1L of alkaline solution, sonicate for 0.5~1h, store at room temperature for 20~30h, centrifuge, wash the filter cake repeatedly with absolute ethanol, vacuum freeze-dry for 24h, and store the obtained particles for later use ;

[0033] 2) GO-SiO 2 Alcoholization of nanoparticles:

[0034] According to the mass fraction of 1:(25~50), the GO-SiO 2 Nanoparticles are blended with polyethylene glycol (molecular weight 400-600), and ultrasonically dispersed for 0.5-2 hours t...

Embodiment 1

[0042] Graphene oxide was prepared using Hummer's modified method. The natural flake graphite powder used is 100 mesh powders, and the purity is 99.999%.

[0043] 1) GO-SiO 2 Preparation of nanoparticles:

[0044] Prepare a mixed solution with a concentration of 60wt% absolute ethanol and pure water, add 2 mg of graphene oxide powder to 1 L of the mixed solution according to the mass ratio, adjust the pH value to 8.0, and drop 3 mg of graphene oxide powder into 1 L of alkaline solution according to the mass ratio Ethyl orthosilicate, ultrasonic the obtained solution for 0.5h, store at room temperature for 30h, centrifuge the mixture, wash the filter cake with absolute ethanol repeatedly for 3 times, and vacuum freeze-dry for 24h, the obtained GO-SiO 2 The nanoparticles are stored for later use.

[0045] 2) GO-SiO 2 Alcoholization of nanoparticles:

[0046] 1wt% GO-SiO 2Nanoparticles and 25wt% polyethylene glycol (molecular weight 400) were blended and ultrasonically disp...

Embodiment 2

[0053] Graphene oxide was prepared using Hummer's improved method. The natural flake graphite powder used is a 100 mesh powder with a purity of 99.999%.

[0054] 1) GO-SiO 2 Preparation of nanoparticles:

[0055] Prepare a mixed solution with a concentration of 70wt% absolute ethanol and pure water, add 30mg of graphene oxide powder to 1L of the mixed solution according to the mass ratio, adjust the pH to 8.3, and drop 0.5mg into 1L of the alkaline solution according to the mass ratio Tetraethyl orthosilicate, the resulting solution was sonicated for 0.5h, stored at room temperature for 25h, the mixture was centrifuged, and the filter cake was repeatedly washed with absolute ethanol for 3 times, and vacuum freeze-dried for 24h, the obtained GO-SiO 2 The nanoparticles are stored for later use.

[0056] 2) GO-SiO 2 Alcoholization of nanoparticles:

[0057] 1wt% GO-SiO 2 Nanoparticles and 30wt% polyethylene glycol (molecular weight 600) were blended and ultrasonically dispe...

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Abstract

The invention discloses a preparation method of an alcoholized GO-SiO2 particle modified flat plate composite forward osmotic membrane. The preparation method comprises the steps that (1) GO-SiO2 nanometer particles are prepared; (2) the GO-SiO2 nanometer particles are alcoholized; (3) a casting membrane solution is prepared; and (4) membrane forming curing is carried out, and the modified flat plate composite forward osmotic membrane is obtained. According to the preparation method, the alcoholized GO-SiO2 nanometer particles are added into the casting membrane solution of the forward osmotic membrane, lactic acid or methyl alcohol is selected as an additive, and the alcoholized GO-SiO2 particle modified flat plate composite forward osmotic membrane is prepared on a supporting layer of a non-woven fabric and polyester screen. The water flux and salinity retention characteristic of the forward osmotic membrane are both improved well. The alcoholized GO-SiO2 particle modified flat plate composite forward osmotic membrane can be widely applied to various fields of the environment, biology, medicine, foods, military and the like.

Description

technical field [0001] The invention belongs to the technical field of separation membrane modification and relates to an alcoholized GO-SiO 2 A method for preparing a particle-modified flat composite forward osmosis membrane. Background technique [0002] In today's wastewater treatment field, membrane separation technology is still an important technology with a wide range of application markets and prospects. Membrane separation technology mainly includes microfiltration, ultrafiltration, nanofiltration, reverse osmosis, forward osmosis, liquid membrane separation, gas membrane separation, electrodialysis, etc. Among them, nanofiltration, reverse osmosis and forward osmosis technologies are widely used in seawater desalination, wastewater treatment, brackish water desalination, energy development and other fields. [0003] Forward osmosis technology uses the high-concentration draw solution on one side of the membrane to generate high osmotic pressure, so that the water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D69/06B01D67/00B01D71/16B01D61/00
CPCB01D61/002B01D67/0079B01D69/06B01D69/12B01D71/16B01D2325/48
Inventor 朱振亚王磊
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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