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A preparation method of amino-modified graphene oxide graft modified ultrafiltration microfiltration membrane

A technology of amino modification and graft modification, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. Performance deterioration and other problems, to achieve the effect of slowing down membrane fouling, slowing down concentration polarization, and low cost

Inactive Publication Date: 2016-08-17
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These measures are mainly to reduce the degree of membrane fouling. Membrane fouling occurs because impurities in the feed water and solutes in the solution are easy to deposit and adsorb on the surface of the membrane or in the membrane matrix, which deteriorates the membrane performance and then leads to serious membrane flux. Volume attenuation and increase in transmembrane pressure difference
Various technical measures taken to slow down membrane fouling, such as backwashing, chemical cleaning, etc., will inevitably increase the input cost of auxiliary equipment and the operating cost of membrane treatment facilities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for amino-modified graphene oxide graft modified ultrafiltration membrane, the specific steps are:

[0020] (1) Add 50g of graphene oxide to 50mL of dimethylformamide, sonicate for 2h at an ultrasonic frequency of 40KHz to obtain a graphene oxide suspension; Amine, 1.25g of dicyclohexylcarboimide, sonicate for 10min at an ultrasonic frequency of 40KHz, react at 120°C for 48h, add 20mL of absolute ethanol, and let it stand overnight; remove the supernatant, and use polytetraethylene The lower precipitate was filtered by the membrane, washed with ethanol and deionized water in sequence, and the obtained sample was dried at 80° C. to obtain graphene oxide nanoparticles with a particle size of 50-100 nm.

[0021] (2) The base membrane (PES ultrafiltration membrane produced by Zhongke Ruiyang Membrane Technology (Beijing) Co., Ltd., with a cut-off molecular weight of 100,000) was soaked in isopropanol for 2 hours. Take it out and immerse it in pure water, soak over...

Embodiment 2

[0025] A method for amino-modified graphene oxide grafted modified microfiltration membrane, the specific steps are:

[0026] (1) 75g of graphene oxide is added to 75mL of dimethylformamide, and ultrasonic treatment is performed for 3h at an ultrasonic frequency of 40KHz to obtain a graphene oxide suspension; 10g of ethylenediamine is added to the graphene oxide suspension, 2.5g of dicyclohexyl carboximide, sonicate for 5min at an ultrasonic frequency of 40KHz, react at 120°C for 50h, add 30mL of absolute ethanol, let stand overnight; remove the upper supernatant, filter with a polytetrafluoroethylene membrane The lower layer was precipitated, washed with ethanol and deionized water in sequence, and the obtained sample was dried at 70° C. to obtain graphene oxide nanoparticles with a size of 500nm-5um and a thickness of 0.8-1.2nm.

[0027] (2) Soak the base membrane (PVDF microfiltration membrane produced by Bluestar Hangzhou Water Treatment Technology Research and Development...

Embodiment 3

[0031] A method for amino-modified graphene oxide grafted modified microfiltration membrane, the specific steps are:

[0032](1) 100g graphene oxide is added in 100mL dimethylformamide, under the condition that ultrasonic frequency is 40KHz ultrasonic treatment 4h, obtain graphene oxide suspension; Add 20g ethylenediamine in graphene oxide suspension, 5g of dicyclohexylcarbimide, ultrasonic 15min under the condition of ultrasonic frequency of 40KHz, react at 120°C for 55h, add 40mL of absolute ethanol, let stand overnight; remove the upper supernatant, filter the lower layer with a polytetrafluoroethylene membrane Precipitate, wash with ethanol and deionized water in sequence, and dry the obtained sample at 70°C to obtain graphene oxide nanoparticles with a size of 200nm-500nm and a thickness of 1-1.6nm.

[0033] (2) Soak the base membrane (PS microfiltration membrane produced by Shanghai Snap Membrane Separation Technology Co., Ltd., with an average pore size of 0.1 μm) in pr...

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PUM

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Abstract

The invention discloses a method for preparing an amidogen-modified oxidized graphene grafting modification ultra-filtration or micro-filtration membrane. The method is characterized by including the steps of mixing oxidized graphene, dimethylformamide, an organic solvent and dicyclohexyl carbimide, conducting the ultrasonic reaction, adding absolute ethyl alcohol, obtaining amidogen-modified oxidized graphene after obtained precipitation is washed and dried, placing a basement membrane in a dopamine buffer solution with a certain concentration after being processed through infiltration, conducting surface coating on the membrane under the aeration condition, soaking the membrane in ethyl alcohol for standby application, preparing amidogen-modified oxidized graphene dispersion liquid through the amidogen-modified oxidized graphene, adding an appropriate volume of the amidogen-modified oxidized graphene dispersion liquid to a Tris-HCL buffer solution to obtain a mixed solution, soaking the basement membrane coated with polymerization dopamine in the mixed solution, and conducting the grafting reaction to obtain the amidogen-modified oxidized graphene grafting modification ultra-filtration or micro-filtration membrane. The amidogen-modified oxidized graphene grafting modification ultra-filtration or micro-filtration membrane prepared through the method has the advantages of being high in mechanical strength and high in hydrophily.

Description

technical field [0001] The invention relates to a method for grafting modified ultrafiltration / microfiltration membranes by amino-modified graphene oxide, and belongs to the technical field of membrane production. Background technique [0002] The ultrafiltration membrane separation process is that the solution is under pressure, the solvent and some low-molecular-weight solutes pass through the micropores on the membrane to reach the other side of the membrane, while the high-molecular solutes or other emulsified micelles are trapped to achieve separation from the solution. Objective: The ultrafiltration process has the characteristics of large separation coefficient, operating temperature around room temperature, no phase change, simple operation and relatively simple equipment, and has been widely used. [0003] Ultrafiltration membrane separation technology is also being used more and more frequently in water treatment, and it may become one of the leading technologies i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/78B01D67/00
Inventor 李方李佳峰赵永军孟蝶黄嘉慧王随峰张冉冉郑凯王康伟
Owner DONGHUA UNIV
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