Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Compound nanofiltration membrane for dye desalination and treatment of waste water during dye desalination, as well as preparation method of compound nanofiltration membrane

A composite nanofiltration membrane and wastewater treatment technology, which is applied in the direction of osmosis/dialysis water/sewage treatment, general water supply saving, chemical instruments and methods, etc., can solve the problems that limit the wide application of membrane technology, the surface inorganic materials are easy to fall off, and improve the application technology Cost and other issues, to achieve good dye desalination performance, high practical value, improve the effect of interception performance

Active Publication Date: 2014-06-18
TIANJIN POLYTECHNIC UNIV
View PDF6 Cites 32 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of polymerizing inorganic materials through chemical bond self-assembly on the surface of the membrane must have the problem that the surface inorganic materials are easy to fall off in practical applications, which affects the service life of the membrane.
The currently developed polyvinyl alcohol composite film cannot be used in the treatment of high-temperature dyes (T≥60 °C) due to the low glass transition temperature of polyvinyl alcohol (60°C<Tg<80°C). Requires pre-treatment of the feed liquid, which increases the cost of the applied technology
At the same time, the application of membrane technology in the field of dyes has serious membrane pollution, low water flux, short service life and high cost of membrane materials, which limit the wide application of membrane technology in the field of dyes.

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
  • Compound nanofiltration membrane for dye desalination and treatment of waste water during dye desalination, as well as preparation method of compound nanofiltration membrane
  • Compound nanofiltration membrane for dye desalination and treatment of waste water during dye desalination, as well as preparation method of compound nanofiltration membrane
  • Compound nanofiltration membrane for dye desalination and treatment of waste water during dye desalination, as well as preparation method of compound nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Immerse the polyvinylidene fluoride (PVDF) hollow fiber membrane in 1mol / L NaOH alkali solution at 60°C for 30 minutes, and then wash it with distilled water until the solution is neutral;

[0022] (2) immerse the treated hollow fiber membrane into the PVA solution of 0.5% by mass fraction, take it out and dry it, and then immerse it into the glutaraldehyde mass fraction of 30°C as 3%, and the concentrated sulfuric acid mass fraction as 6% Cross-linking in ethanol solution for 10 min. In the above process, the PVA coating solution was soaked for 3 times, respectively for 10 minutes, 10 minutes, and 1 minute, and each time it was dried, it was crosslinked with a crosslinking agent solution for 10 minutes.

[0023] (3) The hollow fiber composite membrane coated and crosslinked three times was then placed in an oven at 100° C. for heat setting for 10 minutes.

[0024] (4) Use 50ppm of Congo red (molecular weight: 696.68 Daltons), methyl orange (molecular weight: 327.3...

Embodiment 2

[0026] (1) Immerse the PVDF hollow fiber membrane in 1mol / L KOH alkali solution at 40°C for 30 minutes, and then wash it with distilled water until the solution is neutral;

[0027] (2) Immerse the alkali-treated hollow fiber membrane into a PVA mass fraction of 1%, nano-titanium dioxide (nano-TiO 2 ) with a mass fraction of 0.1% of PVA / nano-TiO 2 In the water solution, take out after 10 minutes to dry. Then immerse it in an ethanol solution with a mass fraction of succinic acid of 3% and an acid catalyst mass fraction of 1% at 40°C. After cross-linking treatment for 10 minutes, take it out to dry, and repeat immersion coating and cross-linking treatment twice. ;

[0028] (3) The hollow fiber composite membrane coated and crosslinked three times was then placed in an oven at 100° C. for heat setting for 10 minutes.

[0029] (4) Using 50ppm Congo red, methyl orange and methyl blue aqueous solutions respectively, the performance of the composite membrane was tested under a pr...

Embodiment 3-6

[0031] Keep the content and temperature of lye and crosslinking agent solution constant, change the mass fraction of PVA and nano-TiO 2 The input amount, other operating conditions are all the same as example 1:

[0032] Table 1. Embodiment 3-6 concrete implementation scheme:

[0033]

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

PropertyMeasurementUnit
Pure water fluxaaaaaaaaaa
Login to View More

Abstract

The invention relates to a compound nanofiltration membrane for dye desalination and treatment of waste water during dye desalination, as well as a preparation method of the compound nanofiltration membrane. A hollow fiber membrane is used as a base membrane of the compound membrane, and nano particle-modified PVA membrane coating liquid is used for coating the outer surface of the hollow fiber base membrane by a dip coating method so as to obtain the compound nanofiltration membrane. The preparation method of the compound nanofiltration membrane comprises the following steps: (1) pretreating the hollow fiber ultrafiltration base membrane; (2) coating and crosslinking a PVA / nano particle compound functional layer; and (3) carrying out thermal treatment on the compound nanofiltration membrane. The prepared nano particle-modified PVA compound membrane nanofiltration membrane is used for separating a mixed solution of organic dye macromolecules and salts. The compound nanofiltration membrane has the significant characteristics that dye molecules with molecular weight being greater than 300 dalton can be intercepted, and all monovalent and divalent inorganic salts can pass; the compound nanofiltration membrane can fully separate mixed solutions of dye molecules of Congo red, methyl orange, methyl blue and the like and salts such as sodium sulfate and sodium chloride; moreover, the membrane has favorable pollution resistance and temperature resistance; meanwhile, the method provided by the invention is simple in preparation technology, is low in cost, and solves such problems of a membrane material in dye desalination as short service life, poor chemical resistance and high cost.

Description

technical field [0001] The invention relates to a composite nanofiltration membrane for dye desalination and wastewater treatment and a preparation method thereof, which is characterized in that the composite nanofiltration membrane uses a hollow fiber membrane as a base membrane and is coated with a polyvinyl alcohol / nanoparticle composite functional layer; The notable feature of the composite membrane is that it can intercept dye molecules with a molecular weight greater than 300 Daltons, and all monovalent and divalent inorganic salts can pass through. The preparation method of the composite nanofiltration membrane comprises (1) pretreatment of hollow fiber ultrafiltration membrane base membrane; (2) coating and crosslinking of polyvinyl alcohol / nanoparticle composite functional layer; (3) preparation of composite nanofiltration membrane heat treatment. Background technique [0002] In the field of dyes, the traditional process separates precipitated dyes by salting out,...

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): B01D69/12B01D71/34B01D71/68B01D71/42B01D67/00C02F1/44
CPCY02A20/131
Inventor 陈英波李希鹏胡晓宇王彪胡林佳张宇峰
Owner TIANJIN POLYTECHNIC UNIV
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com