Renewable polyamide reverse osmosis composite membrane with chlorine resistance and preparation method thereof

A reverse osmosis composite membrane, polyamide technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as easy falling off, and achieve the effect of strengthening chlorine resistance

Active Publication Date: 2018-04-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical grafting method solves the problem of easy shedding in physical coating, but the grafted functional groups also have a chlorination saturation limit

Method used

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  • Renewable polyamide reverse osmosis composite membrane with chlorine resistance and preparation method thereof
  • Renewable polyamide reverse osmosis composite membrane with chlorine resistance and preparation method thereof
  • Renewable polyamide reverse osmosis composite membrane with chlorine resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Immerse the raw polyamide membrane (21cm×14cm) prepared above without surface graft modification into the catalyst, shake it at 37°C and 80r / min for 1h, then wash the surface of the membrane with deionized water to remove free Catalyst: Pour 150mL of phosphate buffer solution containing glycylglycyl peptide (Gly) into the surface of the membrane activated by the catalyst, shake and react at 37°C and 80r / min for 2h, fully wash the surface of the membrane with deionized water, and remove residual mono In bulk, the membrane was kept in deionized water.

[0065] The preparation method of the catalyst is: 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) are dissolved in 2-(N -Morpholine) ethanesulfonic acid buffer, adjust the pH of the catalyst to 5-6 with hydrochloric acid or sodium hydroxide; 2-(N-morpholine) ethanesulfonic acid buffer contains 0.1mol / L of 2-( N-morpholine) ethanesulfonic acid (MES) and 0.5mol / L NaOH.

[00...

Embodiment 2、3

[0069] Compared with Example 1, the difference lies in that the mass percent concentrations of Gly in the phosphate buffer solution are 0.35% and 0.15%, respectively.

Embodiment 4～6

[0071] Compared with Example 1, the difference is that Gly is replaced by glutamine (Gln), and the mass percentage concentrations of Gln in the phosphate buffer solution are 0.15%, 0.25%, and 0.35%, respectively.

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Abstract

The invention discloses a polyamide reverse osmosis composite membrane having renewable chlorine resistance and a preparation method thereof, wherein the preparation method comprises the steps: (1) a polyamide reverse osmosis original membrane having the surface with carboxyl is soaked in a catalyst and is subjected to surface activation; and (2) the membrane obtained after surface activation is soaked in a solution containing a graft material and is subjected to surface grafting, wherein the catalyst contains 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide, and the graft material is at least one of glycylglycine, glutamine and tyrosine. According to the preparation method, the surface of the polyamide reverse osmosis original membrane is introduced with aliphatic amide small molecules with the tail end being carboxyl, amide N-H in a structure is used as an sacrificial-layer functional group for preferentially undergoing a reaction with active chlorine, a body polyamide layer is protected, the chlorine resistance of the polyamide reverse osmosis composite membrane is strengthened, and at the same time, the chlorine resistance can be regenerated through reduction.

Description

technical field [0001] The invention relates to a reverse osmosis composite membrane, in particular to a polyamide reverse osmosis composite membrane with reproducible chlorine resistance and a preparation method thereof. Background technique [0002] Polyamide reverse osmosis composite membrane has the characteristics of large water flux and high salt rejection rate, and has become the mainstream of commercial reverse osmosis membranes. It is widely used in waste water recycling, desalination of seawater and brackish water, environmental engineering, medicine and other fields. In practical engineering applications, the most conventional method to control microbial contamination is to add a large amount of active chlorine to the raw material solution. Although the raw material solution will use activated carbon, sodium sulfite and other reducing agents to remove most of the residual chlorine before entering the reverse osmosis unit, the remaining The trace amount of residual...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/12B01D67/00B01D61/02
CPCB01D61/025B01D67/0006B01D69/12B01D71/56B01D2325/30
Inventor 张林曾艳军黄海侯立安
Owner ZHEJIANG UNIV
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