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Method for preparing anti-pollution forward-permeating polyamide composite film through aftertreatment

A forward osmosis, polyamide technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of forward osmosis polyamide membrane being easily contaminated by organic compounds, reducing the processing efficiency of forward osmosis process, etc. Anti-fouling performance, maintaining selectivity, effect of low catalyst amount

Inactive Publication Date: 2017-06-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing forward osmosis polyamide membrane is easily polluted by organic substances in the water treatment process, resulting in the reduction of the treatment efficiency of the forward osmosis process, and to provide a method for post-processing to prepare anti-pollution forward osmosis polyamide composite membrane method

Method used

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  • Method for preparing anti-pollution forward-permeating polyamide composite film through aftertreatment
  • Method for preparing anti-pollution forward-permeating polyamide composite film through aftertreatment
  • Method for preparing anti-pollution forward-permeating polyamide composite film through aftertreatment

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specific Embodiment approach 1

[0017] Specific embodiment 1: This embodiment is a post-treatment method for preparing anti-pollution forward osmosis polyamide composite membrane, which is specifically completed according to the following steps:

[0018] 1. Coupling: Dissolve dopamine hydrochloride in dimethylformamide, then add 2-bromoisobutyryl bromide and triethylamine under nitrogen protection, and stir and react for 2h-6h under nitrogen protection to obtain a coupling solution;

[0019] 2. Grafting initiator: add tris buffer solution to the coupling solution to obtain a mixed solution, and then immerse the active layer on the surface of the forward osmosis polyamide composite membrane in the mixed solution, and ensure the forward osmosis polyamide composite The support layer on the membrane surface is not in contact with the mixed solution, and the immersion time is 10 min to 90 min, to obtain the graft initiator forward osmosis polyamide composite membrane;

[0020] 3. Graft zwitterionic polymer: dissolve zwi...

specific Embodiment approach 2

[0026] Embodiment 2: The difference between this embodiment and embodiment 1 is: in step 1, dopamine hydrochloride is dissolved in dimethylformamide, and then nitrogen is introduced, and 2-bromoisobutyryl bromide is added under the protection of nitrogen. And triethylamine, and stirred for 3h under the protection of nitrogen to obtain a coupling solution. Others are the same as the first embodiment.

specific Embodiment approach 3

[0027] Specific embodiment three: This embodiment is different from one of specific embodiments one or two in that the volume ratio of the mass of dopamine hydrochloride and the volume of dimethylformamide described in step one is 800 mg:40 mL. Others are the same as the first or second embodiment.

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Abstract

The invention relates to a method for improving pollution resistance of a forward-permeating polyamide composite film through aftertreatmetn modification, in particular to a method for preparing an anti-pollution forward-permeating polyamide composite film through aftertreatment. The method aims at solving the problem that an existing forward-permeating polyamide film is likely to be organically polluted in the water treatment process, and consequently the treatment efficiency of a forward-permeating process is reduced. The method for preparing the anti-pollution forward-permeating polyamide composite film through aftertreatment comprises the steps that 1, coupling of dopamine hydrochloride, 2-bromobutyl bromide and triethylamine is completed in dimethylformamide, and a coupling solution is obtained; 2, the surface of an active layer on the surface of a forward-permeating polyamide composite film is grafted with an initiator; 3, zwitter-ion polymers are grafted, and the anti-pollution forward-permeating polyamide composite film is obtained. The method has the advantages that the anti-pollution performance is greatly improved, and the water passing performance and selectivity on salt of the composite film can be kept. The method can be used for modifying treatment of the forward-permeating polyamide composite film.

Description

Technical field [0001] The invention relates to a method for post-treatment modification to improve the pollution resistance of a forward osmosis polyamide composite membrane. Background technique [0002] The problem of water shortage has become a global challenge. Membrane technology has many advantages such as high efficiency, low energy consumption, convenient operation and management, and it plays an important role in the process of meeting this challenge. As an emerging osmotic pressure-driven membrane treatment technology, Forward Osmosis (FO) technology is considered to be an effective supplement to conventional membrane technology due to its unique advantages in the treatment of some special raw water. The forward osmosis technology uses the osmotic pressure difference between the draw liquid and the raw material liquid as the driving force, and the water passes through the selective membrane to trap pollutants. Compared with the traditional pressure-driven membrane pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00B01D71/78B01D69/02B01D69/12B01D67/00
CPCB01D61/002B01D69/02B01D69/125B01D71/78
Inventor 马军刘彩虹宋丹
Owner HARBIN INST OF TECH
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