Preparation method of graphene oxide composite nano-filtration membrane

A graphene composite and nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of simple and easy operation, high water flux and separation performance

Active Publication Date: 2017-06-13
TIANJIN UNIV
View PDF4 Cites 26 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, however, there is no research on the direct use of graphene oxide/modified g

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of graphene oxide composite nano-filtration membrane
  • Preparation method of graphene oxide composite nano-filtration membrane

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Embodiment 1, prepare graphene oxide composite nanofiltration membrane, step is as follows:

[0018] Step 1. Preparation of polyethersulfone-based membrane: Dissolve polyethersulfone in N,N-dimethylformamide to prepare a casting solution containing polyethersulfone with a mass concentration of 15-18%, and stir at 60°C 4h, and let stand at 60°C for 4h of defoaming. After cooling to room temperature, pour the casting liquid onto the glass plate to scrape the film, put it in a 25°C water bath to solidify into a film, remove it from the glass plate and use deionized water. Soak for 24h to obtain a polyethersulfone-based membrane;

[0019] Step 2, preparation of aminated graphene oxide: adding sodium hydroxide to a graphene oxide solution with a mass fraction of 0.1% to make the concentration reach 0.04%, and ultrasonically dispersing the mixture for 3 hours. Add hydrochloric acid to the above mixture until the pH value is neutral, and then centrifuge and wash with deionize...

Example Embodiment

[0022] Embodiment 2, the preparation of graphene oxide composite nanofiltration membrane, its preparation process is basically the same as that of embodiment 1, the difference is only: in step 3, the obtained polyethersulfone-based membrane is immersed in the aminated graphene oxide aqueous solution, and its amino The mass fraction of the graphene oxide aqueous solution was changed from 0.00005% to 0.0005%, and the graphene oxide composite nanofiltration membrane 2 was finally obtained.

[0023] The water flux of the graphene oxide composite nanofiltration membrane 2 prepared in Example 2 under 0.2MPa operating pressure is 27.8L / (m 2 h), the rejection rate of sodium orange (mass fraction 0.01%) aqueous solution was 93.6%. figure 1 It is a graph of the rejection rate of graphene oxide composite nanofiltration membrane 2 for sodium orange, Congo red, and methyl blue (all 0.01% by mass) aqueous solution.

Example Embodiment

[0024] Embodiment 3, the preparation of graphene oxide composite nanofiltration membrane, the preparation process is basically the same as that of embodiment 1, the difference is only: in step 3, the obtained polyethersulfone-based membrane is immersed in the aminated graphene oxide aqueous solution, and its amino The mass fraction of the graphene oxide aqueous solution was changed from 0.00005% to 0.001%, and the graphene oxide composite nanofiltration membrane 3 was finally obtained.

[0025] The water flux of the graphene oxide composite nanofiltration membrane 3 prepared in Example 3 under 0.2MPa operating pressure is 25.5L / (m 2 h), the rejection rate of sodium orange (mass fraction 0.01%) aqueous solution was 95.0%.

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
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a preparation method of a graphene oxide composite nano-filtration membrane. The method mainly comprises the following steps: preparing a polyethersulfone ultra-filtration base membrane by adopting a phase inversion method; carrying out surface grafting to prepare aminated graphene oxide; sequentially immersing the polyethersulfone ultra-filtration base membrane into a low-concentration water-phase monomer aminated graphene oxide and organic monomer trimesoyl chloride solution; carrying out interface polymerization to prepare the graphene oxide composite membrane. The preparation method disclosed by the invention has the advantages that the aminated graphene oxide is used for carrying out the interface polymerization of a water-phase monomer and a process is simple and easy to operate; compared with a polyamide separation membrane prepared by a traditional interface polymerization method, a separation layer of the prepared graphene oxide composite membrane is very thin and the graphene oxide composite membrane has relatively high water flux and separation performance under relatively low operation pressure (0.2MPa).

Description

technical field [0001] The invention relates to a preparation method of a graphene oxide composite membrane, belonging to the technical field of composite membrane preparation. Background technique [0002] Nanofiltration technology is a pressure-driven membrane separation technology whose separation accuracy is between reverse osmosis and ultrafiltration. The pore size of nanofiltration membrane is 0.5-2nm, its operating pressure is usually 0.3-1.0MPa, and the molecular weight cut-off is 200- 1000 range. Compared with reverse osmosis, nanofiltration membranes have higher water flux at lower operating pressures and higher rejection rates for divalent ions and small organic molecules. Nanofiltration membranes are widely used in the desalination of brackish water, printing and dyeing wastewater treatment, biochemical preparations and pharmaceutical purification and other fields. [0003] At present, nanofiltration membranes are classified into two types: asymmetric membranes...

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
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B01D69/12B01D71/06B01D67/00B01D61/02
CPCB01D61/027B01D67/0002B01D69/12B01D71/021B01D71/06
Inventor 姜忠义张润楠贺明睿刘亚楠苏延磊
Owner TIANJIN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap