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
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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.
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Property | Measurement | Unit |
Pure water flux | 11.6 | h·l/m² |
tensile | MPa | |
Particle size | Pa | |
strength | 10 |
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