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Preparation method of graphene oxide-based ultrafiltration membrane

A graphene-based, ultrafiltration membrane technology, applied in the field of materials, can solve the problems of low filtration efficiency, low water flux, and poor hydrophilicity of ultrafiltration membranes, and achieve good hydrophilicity, improved hydrophilicity, and high The effect of negative charge

Inactive Publication Date: 2021-05-07
WUXI DONGHENGNEWENERGYTECHNOLOGYCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ultrafiltration membrane produced by this method has poor hydrophilicity and low water flux, which leads to low filtration efficiency and is easy to be polluted. Therefore, it is necessary to provide a membrane with high hydrophilicity, high water flux and high filtration efficiency. A good ultrafiltration membrane is essential

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of graphene oxide-based ultrafiltration membrane, comprising the following steps:

[0024] (1) Graphene oxide was added into pure water, ultrasonically treated for 2.5 hours, and prepared into a 1 mg / mL modified graphene oxide suspension, which was frozen and put into a freeze dryer for 48 hours;

[0025] (2) followed by vacuum drying for 48h to form graphene oxide powder;

[0026] (3) Spread the graphene oxide powder on the ground electrode in the low-temperature plasma treatment device, and process it for 10 min at a power frequency of 20 kHz, an operating voltage of 20 kV, and a discharge power of 80 W to obtain low-density and loose graphene oxide powder;

[0027] (4) Add 0.15 g of amino-terminated polyethylene glycol and 0.1 g of low-density loose graphene oxide powder into 80 mL of N,N-dimethylformamide for ultrasonic dispersion for 1 h, and magnetically stir for 4 h at room temperature;

[0028] (5) After the reaction is finished, centrifuga...

Embodiment 2

[0036] A preparation method of graphene oxide-based ultrafiltration membrane, comprising the following steps:

[0037] (1) Graphene oxide was added into pure water, ultrasonically treated for 2.5 hours, and prepared into a 1 mg / mL modified graphene oxide suspension, which was frozen and put into a freeze dryer for 48 hours;

[0038] (2) followed by vacuum drying for 48h to form graphene oxide powder;

[0039] (3) Spread the graphene oxide powder on the ground electrode in the low-temperature plasma treatment device, and process it for 12min at a power frequency of 22kHz, an operating voltage of 20kV, and a discharge power of 85W to obtain low-density and loose graphene oxide powder;

[0040] (4) Add 0.15 g of amino-terminated polyethylene glycol and 0.2 g of low-density loose graphene oxide powder into 80 mL of N,N-dimethylformamide for ultrasonic dispersion for 1 h, and magnetically stir for 4.5 h at room temperature;

[0041] (5) After the reaction is finished, centrifugall...

Embodiment 3

[0049] A preparation method of graphene oxide-based ultrafiltration membrane, comprising the following steps:

[0050] (1) Graphene oxide was added into pure water, ultrasonically treated for 2.5 hours, and prepared into a 1 mg / mL modified graphene oxide suspension, which was frozen and put into a freeze dryer for 48 hours;

[0051] (2) followed by vacuum drying for 48h to form graphene oxide powder;

[0052] (3) Spread the graphene oxide powder on the ground electrode in the low-temperature plasma treatment device, and process it for 13 minutes at a power frequency of 23kHz, an operating voltage of 20kV, and a discharge power of 90W to obtain low-density and loose graphene oxide powder;

[0053](4) Add 0.15 g of amino-terminated polyethylene glycol and 0.2 g of low-density loose graphene oxide powder into 80 mL of N,N-dimethylformamide for ultrasonic dispersion for 1 h, and magnetically stir for 4.5 h at room temperature;

[0054] (5) After the reaction is finished, centrifu...

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Abstract

The invention provides a preparation method of a graphene oxide-based ultrafiltration membrane. The preparation method comprises the following steps: preparing graphene oxide powder; preparing low-density loose graphene oxide powder; taking amino-terminated polyethylene glycol and low-density loose graphene oxide powder, adding the amino-terminated polyethylene glycol and the low-density loose graphene oxide powder into N, N-dimethylformamide, carrying out ultrasonic dispersion reaction, filtering, washing and drying to obtain modified graphene oxide; mixing the modified graphene oxide with a dopamine solution, and carrying out an ultrasonic oscillation reaction to generate a modified graphene oxide suspension; removing water and oil from the polyethersulfone ultrafiltration membrane; performing drying; and pouring the modified graphene oxide suspension on the surface of the membrane for surface grafting reaction, and drying the membrane in a drying oven after the reaction to obtain the graphene oxide-based ultrafiltration membrane. The water contact angle of the prepared graphene oxide-based ultrafiltration membrane is about 15 degrees, the hydrophilicity is good, the water flux can reach 283.2 L / (m<2>.H), and the sodium sulfate retention rate can reach 97.3%.

Description

technical field [0001] The invention relates to the field of materials, in particular to a method for preparing a graphene oxide-based ultrafiltration membrane. Background technique [0002] Polyethersulfone is a kind of thermoplastic engineering plastics. Its molecular chain contains hard segment benzene ring group, soft segment ether bond group and stable sulfone bond. It not only has excellent heat resistance, but also has good resistance to ultraviolet light and oxidation. , aging resistance, hydrolysis resistance, acid and alkali resistance and good mechanical strength, it is an ultrafiltration membrane material widely used in industry at present. Since the 1960s when S.Loeb et al. used the immersion precipitation phase inversion method to prepare asymmetric membranes, this method has become one of the important methods for preparing separation membranes. Most of the polyethersulfone ultrafiltration membranes widely used in many fields are prepared by immersion precipi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/14B01D69/12B01D67/00B01D69/10
CPCB01D61/145B01D69/125B01D67/0081B01D67/0093B01D69/105B01D2325/36B01D2323/38
Inventor 沈宇栋吴鹏飞
Owner WUXI DONGHENGNEWENERGYTECHNOLOGYCO LTD
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