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Composite reverse osmosis membrane modified by chitin whiskers and preparation method thereof

A chitin whisker, reverse osmosis membrane technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of failure of anti-pollution performance, poor anti-pollution performance, decreased membrane flux, etc. To achieve the effect of convenient source of raw materials, excellent mechanical properties and chlorine resistance, strong hydrophilicity and antibacterial properties

Active Publication Date: 2019-04-16
恩泰环保科技(常州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to reduce the membrane flux caused by the poor anti-fouling performance of the existing reverse osmosis membrane, the easy degradation of the polyvinyl alcohol coating and the chitosan coating leads to the failure of the anti-pollution performance and the ineffectiveness of antibacterial drugs in the reverse osmosis membrane. Unfriendly to the human body and the environment, etc., providing a composite reverse osmosis membrane modified by chitin whiskers

Method used

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  • Composite reverse osmosis membrane modified by chitin whiskers and preparation method thereof
  • Composite reverse osmosis membrane modified by chitin whiskers and preparation method thereof
  • Composite reverse osmosis membrane modified by chitin whiskers and preparation method thereof

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preparation example Construction

[0031] In a specific embodiment, the preparation method of the composite reverse osmosis membrane modified by the chitin whiskers at least comprises the following steps:

[0032] Step S01. Carrying out deacetylation reaction treatment to chitin whiskers;

[0033] Step S02. Dispersing the deacetylated chitin whiskers and polysulfone in the dispersion liquid to form a solution, heating the deacetylated chitin whiskers and polysulfone for cross-linking reaction, and then coating the surface of the substrate to form a film ;

[0034] Step S03. Immersing the substrate containing the membrane in deionized water, so that the membrane layer is solidified into a mixed support layer with a porous structure;

[0035] Step S04. Apply m-phenylenediamine solution and trimesoyl chloride solution successively on the surface of the mixed support layer to obtain a dense layer; rinse and dry to obtain a chitin whisker-modified composite reverse osmosis membrane.

[0036] Wherein, before the st...

Embodiment 1

[0059] (1) Extraction of chitin whiskers:

[0060] Chitin was dissolved in 3M hydrochloric acid solution at a concentration of 33g / L, and heated at 104°C for 90min;

[0061] Dilute the chitin-hydrochloric acid suspension with deionized water at a mass ratio of 1:10, then centrifuge at a speed of 10000rpm for 5min in a centrifuge to collect the precipitate;

[0062] After repeating the centrifugation process three times, the precipitate was put into a dialysis bag and dialyzed in continuous distilled water flow for 24 hours;

[0063] After water dialysis, the obtained chitin whiskers were dispersed in an acidic aqueous solution with a pH of 5.9 at a concentration of 1.5 wt%, and sealed and stored at 4° C. for future use.

[0064] (2) Chitin whisker deacetylation treatment:

[0065] Chitin whiskers were mixed with 50wt% sodium hydroxide solution at a mass ratio of 1:30, and heated at 80°C for 4 hours to deacetylate chitin. After the reaction is completed, the suspension is ce...

Embodiment 2

[0074] Except that the deacetylation reaction time was changed to 8h, others were the same as in Example 1.

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Abstract

The invention relates to the technical field of reverse osmosis membranes, in particular to a chitin whisker-modified composite reverse osmosis membrane and a preparation method thereof. The chitin whisker-modified composite reverse osmosis membrane comprises a basal layer, a hybrid support layer, and a compact layer solidified on the hybrid support layer; the hybrid support layer is formed by cross-linking combined polysulfone and surface-deacetylated chitin whisker. A chitin whisker in the chitin whisker-modified composite reverse osmosis membrane has excellent mechanical properties and chlorine resistance, while the deacetylated chitin whisker has higher hydrophily and antibacterial property, so that the stain resistance and the water flux of the reverse osmosis membrane can be improved, and finally, the reverse osmosis membrane not only shows better durability but also has favorable stain resistance and water flux, and is environmentally-friendly without pollution at the same time.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis membranes, in particular to a composite reverse osmosis membrane modified by chitin whiskers and a preparation method thereof. Background technique [0002] With the rapid development of society, the total fresh water content of the earth can no longer meet the needs of people's lives. Seawater desalination and water purification provide a very effective way to solve the water shortage problem facing the world today. Among them, whether it is seawater desalination or water purification industry, reverse osmosis membrane has become the most commonly used membrane today. [0003] Among all kinds of reverse osmosis membranes, polyamide composite reverse osmosis membranes have become the mainstream of today's reverse osmosis membranes due to their excellent separation performance and permeability. In the practical application of reverse osmosis membranes, the adsorption of suspended and disso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/02B01D69/12B01D71/68B01D67/00B01D61/02
CPCB01D61/025B01D69/02B01D69/125B01D71/68B01D2325/30B01D2325/36B01D2325/48
Inventor 王冀张晓民罗教明杨佳富吴术球陈剑
Owner 恩泰环保科技(常州)有限公司
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