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Preparation method of oxidized graphene doped hollow fiber nanofiltration membrane

A technology of graphene and nanofiltration membranes, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of lack of foundation for wide application or industrialization, and no report or preparation of hollow fiber nanofiltration membranes. Problems such as cumbersome process, to achieve the effect of improving flux and pollution resistance, good wetting performance and surface activity, and simple process

Inactive Publication Date: 2017-06-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it has been reported that the preparation of graphene for nanofiltration membrane is feasible, but the existing research is mainly for flat membrane, and the preparation process is cumbersome, the conditions are harsh, and there is no basis for wide application or industrialization.
At present, there is no report on the preparation of hollow fiber nanofiltration membranes using graphene oxide.

Method used

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  • Preparation method of oxidized graphene doped hollow fiber nanofiltration membrane
  • Preparation method of oxidized graphene doped hollow fiber nanofiltration membrane
  • Preparation method of oxidized graphene doped hollow fiber nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Collect 10 hollow fiber ultrafiltration membranes (the ultrafiltration membrane material is polysulfone) with a length of 25cm into a bundle, put them into a component housing with a length of 20cm, and use epoxy AB glue after mixing thoroughly Carry out packaging, after the epoxy AB glue is cured, cut off the excess membrane wires at both ends of the shell, and prepare the membrane components for later use;

[0042] (2) Prepare respectively 0.4wt% piperazine, 0.2wt% sodium phosphate, 0.001wt% graphene oxide mixed solution as the water phase, and 0.3wt% trimesoyl chloride solution as the organic phase; the solvent of the organic phase solution is n-hexane Alkane; The solvent of the aqueous phase solution is pure water;

[0043] (3) Introduce the aqueous phase solution into the inner cavity of the hollow fiber basement membrane and discharge the air bubbles, fully immerse for 10 minutes, then remove the excess aqueous phase solution in the inner cavity of the membran...

Embodiment 2

[0045] (1) 30 hollow fiber ultrafiltration membranes with a length of 25cm (the ultrafiltration membrane material is polyvinylidene fluoride) are collected into a bundle, put into a module housing with a length of 20cm, and use epoxy resin after mixing thoroughly AB glue for packaging, after the epoxy AB glue is cured, cut off the excess membrane wires at both ends of the shell, and prepare the membrane assembly for later use;

[0046] (2) prepare respectively 0.4wt% p-phenylenediamine, 0.2wt% sodium phosphate, 0.005wt% graphene oxide mixed solution as the water phase, 0.3wt% trimesoyl chloride solution as the organic phase; the solvent of the organic phase solution It is n-hexane; the solvent of the aqueous phase solution is a mixed solution of pure water and ethanol (volume ratio is 9:1);

[0047] (3) Introduce the aqueous phase solution into the inner cavity of the hollow fiber basement membrane and discharge the air bubbles, fully immerse for 10 minutes, then remove the ex...

Embodiment 3

[0049](1) 80 hollow fiber ultrafiltration membranes (the ultrafiltration membrane material is polyvinyl chloride) that 80 lengths are 25cm are gathered into a bundle, and the length of packing into is 20cm in the module housing, and with epoxy AB after mixing thoroughly After the epoxy AB glue is cured, cut off the excess membrane wires at both ends of the shell, and prepare the membrane assembly for use;

[0050] (2) Prepare respectively 0.4wt% m-phenylenediamine, 0.2wt% sodium phosphate, 0.01wt% graphene oxide mixed solution as the water phase, and 0.3wt% trimesoyl chloride solution as the organic phase; the solvent of the organic phase solution It is n-hexane; the solvent of the aqueous phase solution is a mixed solution of pure water and ethanol (volume ratio is 8:2);

[0051] (3) Introduce the aqueous phase solution into the inner cavity of the hollow fiber basement membrane and discharge the air bubbles, fully immerse for 10 minutes, then remove the excess aqueous phase ...

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Abstract

The invention provides a preparation method of an oxidized graphene doped hollow fiber nanofiltration membrane. The preparation method comprises the steps that a plurality of hollow fiber nanofiltration membrane serve as basic membranes to be packaged into a component shell to obtain a membrane component for usage; oxidized graphene, an active monomer and an acid absorbing agent are added into a solvent A for uniform ultrasonic mixing to obtain a solution A; multielementacyl chloride is dissolved in a solvent B to obtain a solution B; the solution A is introduced into the inner cavity of the hollow fiber nanofiltration membrane of the membrane component for full infiltration, the solution A is removed, drying is performed, the solvent B is introduced into the inner cavity of the membrane for interfacial polymerization reaction, then the solution B is removed, drying is performed, andpure-water rinsing and drying are performed to obtain the membrane. The oxidized graphene is added in the membrane preparation process and has the very good effect on the aspects of surface hydrophilicity improvement, membrane flux increase and pollution resistance. The product is good in mechanical strength andcontamination resistance and is higher than an oxidized-graphene-free pure polyamide nanofiltration membraneindesalting rate and water flux.

Description

[0001] (1) Technical field [0002] The invention relates to the field of hollow fiber nanofiltration membrane preparation, in particular to a method for preparing a graphene oxide-doped hollow fiber nanofiltration membrane. [0003] (2) Background technology [0004] Nanofiltration (NF) is a pressure-driven membrane separation process between reverse osmosis (RO) and ultrafiltration (UF), and it is one of the fastest-growing membrane separation technologies. It is generally believed that the pore size of the nanofiltration membrane is between 0.5 and 2 nm, and the molecular weight cut off (MWCO) is 200 to 2000. It has a nanoscale pore size range and a charged surface active layer. The effects are jointly determined. It has been widely used in drinking water and industrial wastewater treatment. [0005] The key core point of membrane separation technology is the membrane material. The selective layer of the widely used commercial nanofiltration membrane is mainly polyamide, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/08B01D71/30B01D71/34B01D71/42B01D71/68
CPCB01D71/68B01D61/027B01D67/0079B01D69/08B01D71/30B01D71/34B01D71/42
Inventor 魏秀珍陈金媛洪家亮吴家炜
Owner ZHEJIANG UNIV OF TECH
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