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
6 Cites 32 Cited by

AI-Extracted 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 g...
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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.

Application Domain

Semi-permeable membranesGeneral water supply conservation +1

Technology Topic

Inorganic saltsChloride sodium +23

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(7)

Example Embodiment

[0020] Example 1
[0021] (1) Immerse the polyvinylidene fluoride (PVDF) hollow fiber membrane in 1 mol/L NaOH alkali solution at 60°C for 30 minutes, and then wash with distilled water until the solution is neutral;
[0022] (2) Immerse the treated hollow fiber membrane in a PVA solution with a mass fraction of 0.5%, take it out to dry, and then immerse it in a 30°C glutaraldehyde with a mass fraction of 3% and concentrated sulfuric acid with a mass fraction of 6% crosslink in ethanol solution for 10 min. The above process was soaked in the PVA coating solution three times, respectively, for 10 minutes, 10 minutes, and 1 minute, and each time after drying, they were cross-linked with a cross-linking agent solution for 10 minutes.
[0023] (3) The hollow fiber composite membrane coated and crosslinked 3 times was then placed in an oven at 100° C. for heat setting for 10 minutes.
[0024] (4) Using 50ppm of Congo red (molecular weight: 696.68 Daltons), methyl orange (molecular weight: 327.33 Daltons) and methyl blue (molecular weight: 799.80 Daltons) aqueous solutions, respectively, tested under a pressure of 0.3 MPa The performance of the composite membrane, the pure water flux of the composite membrane is 19.60L/m 2 h, the rejection rates for Congo red, methyl orange, and methyl blue were 88.78%, 45.31%, and 86.58%, respectively, and the rejection rates for sodium sulfate and sodium chloride were both 0%.

Example Embodiment

[0025] Example 2
[0026] (1) Immerse the PVDF hollow fiber membrane in 1 mol/L KOH alkali solution at 40°C for 30 minutes, and then wash with distilled water until the solution is neutral;
[0027] (2) Immerse the alkali-treated hollow fiber membrane into PVA with a mass fraction of 1%, nano-titanium dioxide (nano-TiO 2 ) with a mass fraction of 0.1% PVA/nano-TiO 2 In aqueous solution, take it out to dry after 10 minutes. Then, it was immersed in an ethanol solution with a mass fraction of succinic acid of 3% and a mass fraction of acid catalyst of 1% at 40°C. After cross-linking treatment for 10 minutes, it was taken out to dry, and the immersion coating and cross-linking treatment were repeated twice. ;
[0028] (3) The hollow fiber composite membrane coated and cross-linked for 3 times was then placed in an oven at 100° C. for heat-setting for 10 minutes.
[0029] (4) Test the performance of the composite membrane with 50ppm of Congo red, methyl orange and methyl blue aqueous solutions under a pressure of 0.3MPa, and the pure water flux of the composite membrane is 25.63L/m 2 h, the rejection rates for Congo red, methyl orange, and methyl blue were 91.70%, 40.31%, and 92.52%, respectively.

Example Embodiment

[0030] Examples 3-6
[0031] Keep the content and temperature of lye and crosslinker solution unchanged, change the mass fraction of PVA and nano-TiO 2 and other operating conditions are the same as in Example 1:
[0032] Table 1. Examples 3-6 specific embodiments:
[0033]
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PUM

PropertyMeasurementUnit
Pure water flux11.6h·l/m²
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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