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Water-treatment composite modified film and preparation method thereof

A composite modification and water treatment technology, applied in osmosis/dialysis water/sewage treatment, chemical instruments and methods, membrane technology, etc., can solve the problems of underutilization and waste, save the cost of membrane production and reduce the dosage Effect

Inactive Publication Date: 2018-05-04
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, compared with the macroporous structure inside the membrane, the dense skin layer on the membrane surface plays a key role in intercepting pollutants, and the change of its properties has a more significant impact on the filtration performance of the membrane, while the polymers prepared by conventional TIPS and NIPS methods In the blended modified membrane, most of the modifiers are doped in the thicker macroporous support layer, which does not fully play its role, resulting in serious waste

Method used

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  • Water-treatment composite modified film and preparation method thereof
  • Water-treatment composite modified film and preparation method thereof

Examples

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example 1

[0018] Example 1 A kind of composite modified membrane for water treatment

[0019] A composite modified membrane for water treatment, comprising a support material, a blank polymer cast film liquid layer and a polymer-modifier composite layer, the blank polymer cast film liquid layer is scraped on the surface of the support material, and the polymer-modifier The composite layer is scraped on the surface of the blank polymer cast film liquid layer. The composition of the polymer-modifier composite layer is as follows: the modifier is nano-TiO 2 , nano Ag, graphene oxide and its modified products, anionic surfactants, amphoteric surfactants or amphiphilic block polymers or a combination thereof.

[0020] In order to obtain better results, the composition of the blank polymer casting film liquid layer is: one or more of polyvinylidene fluoride, polytetrafluoroethylene, polysulfone, polyethersulfone, sulfonated polyethersulfone, and cellulose acetate The combination.

[0021] ...

Embodiment 3

[0022] Embodiment 3 A kind of preparation method of composite modified membrane for water treatment

[0023] Add 0.1 g GO into a three-necked flask with 78 mL NMP, and use an ultrasonic cleaner to ultrasonicate the solution for 1 h until GO is completely dispersed. Then add 16g PVDF and 6g PEG, place in a 60o water bath and stir until PVDF and PEG are completely dissolved to form a uniform PVDF-GO composite casting solution. Another 16g of PVDF and 6g of PEG were added to a three-necked flask filled with 78mL of NMP, placed in a 60o water bath and stirred until PVDF and PEG were completely dissolved to form a uniform PVDF blank casting solution. The PVDF-GO modified film was scraped by layered scraping: firstly, the non-woven fabric was fixed on the surface of the CNC coating machine, the height of the scraper was adjusted to 150 μm, and the PVDF blank casting solution was poured in front of the scraper, and the scraping thickness was 150μm PVDF blank casting film liquid laye...

example 2

[0027] Example 2 A kind of preparation method of composite modified membrane for water treatment

[0028]Add 0.02g of Ag nanoparticles into a three-necked flask with 78mL of NMP, and use an ultrasonic cleaner to ultrasonicate the solution for 1h until Ag is completely dispersed. Then add 18g PES and 4g PVP, place in a 60o water bath and stir until the PES and PVP are completely dissolved to form a uniform PES-Ag composite casting solution. Another 18g of PES and 4g of PVP were added to a three-necked flask containing 78mL of NMP, placed in a 60o water bath and stirred until the PES and PVP were completely dissolved to form a uniform PES blank casting solution. Scrape the PES-Ag composite modified film by layered scraping: first, fix the non-woven fabric on the surface of the CNC coating machine, adjust the height of the scraper to 200 μm, pour the PES blank casting solution in front of the scraper, and scrape the thickness A 200 μm PES blank casting solution layer. Subsequen...

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Abstract

The invention discloses a water-treatment composite modified film and a preparation method thereof. The water-treatment composite modified film comprises a support material, a blank polymer casting film liquid layer and a polymer-modifying agent composite layer, wherein the blank polymer casting film liquid layer is arranged on the surface of the support material in a scraping manner, and the polymer-modifying agent composite layer is arranged on the surface of the blank polymer casting film liquid layer in a scraping manner; and the constitution of the polymer-modifying agent composite layeris as follows: a modifying agent contains one or combination of nano-TiO2, nano-Ag, graphene oxide, a modified substance of graphene oxide, an anionic surfactant, an ampholytic surfactant or an amphiphilic block polymer. A layering film scraping method provided by the invention has the beneficial effects that on the basis that the filtration and anti-pollution performance of the modified film aresimilar to the filtration and anti-pollution performances of a conventional modified film, the use amount of the modifying agent can be greatly reduced, and the film preparation cost can be saved.

Description

technical field [0001] The invention relates to a composite modified membrane for water treatment and a preparation method thereof, belonging to the field of polymer composite materials. Background technique [0002] With the rapid development of economy and industry, environmental problems are becoming more and more serious. Membrane separation technology has the advantages of low energy consumption, high separation efficiency, wide application range, small footprint and no environmental pollution. Membrane is the core of membrane separation technology. At present, polyvinylidene fluoride (PVDF), polyethylene (PE) and polypropylene (PP) membranes are widely used in MBR membrane modules. However, due to the low surface energy and strong hydrophobicity of these polymers, they are easy to adsorb hydrophobic organic pollutants (such as proteins, oils, etc.) Hydration modification is necessary to improve its anti-pollution performance. In recent years, a small amount of hydrop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/10B01D71/16B01D71/34B01D71/36B01D71/68C02F1/44
CPCB01D71/34B01D67/0079B01D69/10B01D71/16B01D71/36B01D71/68C02F1/44
Inventor 任月萍陈莹蕾李秀芬王新华
Owner JIANGNAN UNIV
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