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Preparation method of graphene oxide nanofiltration membrane with adjustable flux

A technology of graphene and nanofiltration membranes, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of increased energy consumption and cost, complicated preparation process, increased resistance, etc., and achieve high water flux and rejection rate, simple preparation method, and controllable spacing

Active Publication Date: 2018-11-13
武汉华谱生物科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zhao Chuanqi et al. added graphene oxide (GO) to polyvinylidene fluoride (PVDF) powder and prepared PVDF / GO composite microfiltration membrane through blending modification. Its anti-pollution performance was significantly improved, and the cleaning cycle was 4 times that of unmodified times, but its resistance increases, which is very unfavorable for practical applications, and will increase energy consumption and cost
Xiao Dongsheng et al. used isophorone diisocyanate (IPDI) to modify graphene oxide (GO), and prepared IP-RGO nanocomposites by solution molding method, and its antistatic performance was significantly improved. Compatibility Good performance and good dispersibility, but the preparation process is complicated

Method used

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  • Preparation method of graphene oxide nanofiltration membrane with adjustable flux
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Embodiment 1

[0024] Graphene oxide was prepared by the improved Hummers method, and the prepared graphene oxide was centrifuged and washed 4 times at 6250 rpm to obtain a graphene oxide aqueous solution with a concentration of 10 mg / mL, which was ultrasonically treated for 7 minutes. Take 0.5mL of the prepared graphene oxide aqueous solution in a 50mL volumetric flask, add 1mL of 1mol L -1 Aqueous solution of ethylenediamine, dilute to 50mL with deionized water, the molar concentration of ethylenediamine in the mixed solution is 0.02mol L -1 . After ultrasonic treatment, vacuum filtration was performed, and the composite membrane was self-assembled by auxiliary pressure vacuum, washed with ultrapure water for 5 times and then dried. Soak the composite membrane in 20mL 0.1mol·L -1 In the n-hexane solution of trimesoyl chloride (TMC), take it out after 30 min, wash with n-hexane for 5 times, and dry at room temperature to obtain the modified graphene oxide composite film. The molar concen...

Embodiment 2

[0026] Graphene oxide was prepared by the improved Hummers method, and the prepared graphene oxide was centrifuged and washed 4 times at 6250 rpm to obtain a graphene oxide aqueous solution with a concentration of 10 mg / mL, which was ultrasonically treated for 7 minutes. Take 0.5mL of the prepared graphene oxide aqueous solution in a 50mL volumetric flask, add 2mL of 1mol L -1 Aqueous solution of ethylenediamine, dilute to 50mL with deionized water, the molar concentration of ethylenediamine in the mixed solution is 0.02mol L -1 . After ultrasonic treatment, vacuum filtration was performed, and the composite membrane was self-assembled by auxiliary pressure vacuum, washed with ultrapure water for 5 times and then dried. Soak the composite membrane in 20mL 0.1mol·L -1 In the n-hexane solution of trimesoyl chloride (TMC), take it out after 30 min, wash with n-hexane for 5 times, and dry at room temperature to obtain the modified graphene oxide composite film. The molar concen...

Embodiment 3

[0028] Graphene oxide was prepared by the improved Hummers method, and the prepared graphene oxide was centrifuged and washed 4 times at 6250 rpm to obtain a graphene oxide aqueous solution with a concentration of 10 mg / mL, which was ultrasonically treated for 7 minutes. Take 0.5mL of the prepared graphene oxide aqueous solution in a 50mL volumetric flask, add 5mL of 1mol·L -1 Aqueous solution of ethylenediamine, dilute to 50mL with deionized water, the molar concentration of ethylenediamine in the mixed solution is 0.1mol L -1 . After ultrasonic treatment, vacuum filtration was performed, and the composite membrane was self-assembled by auxiliary pressure vacuum, washed with ultrapure water for 5 times and then dried. Soak the composite membrane in 20mL 0.1mol·L -1 In the n-hexane solution of trimesoyl chloride (TMC), take it out after 30 min, wash with n-hexane for 5 times, and dry at room temperature to obtain the modified graphene oxide composite film. The molar concent...

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Abstract

The invention discloses a preparation method of a graphene oxide nanofiltration membrane with adjustable flux. The preparation method comprises the following steps: adding ethylenediamine into a graphene oxide aqueous solution and carrying out ultrasound to obtain a dispersion mixed solution; plating the dispersion mixed solution onto the surface of a cellulose acetate basic membrane through an auxiliary pressure vacuum self-assembly method to obtain a composite membrane, and cleaning the composite membrane by using deionized water for many times; soaking the obtained composite membrane in a solution of trimesoyl chloride / n-heptane, cleaning the membrane by using the n-heptane solution for many times after ethylenediamine formed on a to-be-oxidized graphene sheet layer fully reacts with the trimesoyl chloride, and carrying out drying to obtain the required composite nanofiltration membrane. The preparation method has the advantages of simpleness and easiness for operation; compared with an unmodified cellulose acetate membrane, the modified cellulose acetate composite membrane prepared by adopting the method has higher water flux, higher interception ratio, better separation performance and excellent chlorine-resistant performance under lower operation pressure. The nanofiltration membrane prepared by adopting the method has the advantages that a space between a selective layerand the graphene oxide sheet layer is controlled, and the flux is adjusted.

Description

technical field [0001] The invention belongs to the technical field of composite membrane materials, and in particular relates to a preparation method of a flux-adjustable graphene oxide nanofiltration membrane. Background technique [0002] The rapid development of the industrialization process has brought convenience to people's lives, but it also faces environmental problems caused by pollution such as waste water and waste gas. Membrane separation technology, as one of the effective technologies for environmental governance, appeared in the early 20th century. In practical applications, there are many problems in membrane separation technology, and membrane fouling and low separation efficiency are the main limiting factors. In order to further develop and perfect membrane separation technology, different separation membrane materials have been developed one after another. Among them, graphene materials with excellent selectivity and stability stand out and become the ...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D71/02
CPCB01D61/027B01D67/0079B01D69/12B01D71/024
Inventor 熊芸蔡师刘生鹏吴晓宇孙国锋彭俊龙
Owner 武汉华谱生物科技有限公司
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