Graphene oxide modified PA (polyamide) composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and graphene modification technology, which is applied in the direction of chemical instruments and methods, membranes, membrane technology, etc. Poor water resistance, weak anti-pollution ability of nanofiltration membrane and other problems, to achieve the effect of easy operation, enhanced interlayer bonding tightness, and strong controllability
CN109092087AActive Publication Date: 2018-12-28NANJING POLYTECHNIC INSITUTE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING POLYTECHNIC INSITUTE
Publication Date
2018-12-28

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Abstract

The invention discloses a graphene oxide modified PA (polyamide) composite nanofiltration membrane and a preparation method thereof. The method comprises steps as follows: preparing a PA ultrafiltration basement membrane; preparing an aqueous amino graphene oxide solution; adding a crosslinking agent to the prepared aqueous amino graphene oxide solution to prepare an amino graphene oxide crosslinking solution; dip-coating the PA ultrafiltration basement membrane with a layer of the amino graphene oxide crosslinking solution with a surface coating method firstly, then coating the PA ultrafiltration basement membrane with a layer of a PA ultrafiltration membrane casting solution to prepare the graphene oxide modified PA composite nanofiltration membrane. A large quantity of free carboxyl andhydroxyl exist on the membrane surface, so that the graphene oxide modified PA composite nanofiltration membrane has the characteristics of high hydrophilcity and high throughput; meanwhile, due to the crosslinking reaction between amino graphene oxide and a PA basement membrane, tightness can be improved; the membrane surface is negatively charged, so that desalinization rate can be effectivelyincreased, and throughput and desalinization effect of the nanofiltration membrane are improved; the technical scheme has large-scale industrial application and popularization prospect.
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Description

technical field

[0001] The invention relates to the technical field of separation membrane preparation, in particular to a graphene oxide modified polyamide composite nanofiltration membrane and a preparation method thereof. Background technique

[0002] Due to its unique structure and performance, separation membranes have emerged in environmental protection and water resource regeneration, especially in wastewater treatment and reclaimed water reuse. According to the different membrane pore sizes (or molecular weight cut-offs), membranes can be divided into microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, and reverse osmosis membranes.

[0003] Nanofiltration is between reverse osmosis and ultrafiltration, and the pore size is in the nanometer range, generally 0.5 to 2.0 nanometers. Compared with reverse osmosis membranes and ultrafiltration membranes, nanofiltration membranes have special properties and advantages, and have shown broad appl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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