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Anti-biological-pollution composite reverse osmosis membrane and preparation method thereof

An anti-biological fouling and reverse osmosis membrane technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problem of poor anti-biological fouling of polyamide desalination layer, reduce the washing frequency of reverse osmosis membrane, and water flux Low-level problems, achieve good antibacterial and hydrophilic properties, excellent adsorption properties, and widen the effect of flow channels

Active Publication Date: 2020-06-19
恩泰环保科技(常州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the disadvantages of poor biofouling resistance and low water flux of the polyamide desalination layer that occur during the use of the current composite reverse osmosis membrane, by introducing a highly hydrophilic and highly antibacterial compound into the m-phenylenediamine aqueous phase solution. Modified clay minerals and hydrophilic linking agent can improve the anti-biofouling performance and water flux of the composite reverse osmosis membrane, reduce the washing frequency of the reverse osmosis membrane, and maintain the excellent water flux and water flux of the reverse osmosis membrane during long-term use. Salt rejection rate

Method used

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  • Anti-biological-pollution composite reverse osmosis membrane and preparation method thereof
  • Anti-biological-pollution composite reverse osmosis membrane and preparation method thereof
  • Anti-biological-pollution composite reverse osmosis membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] A preparation of anti-biological fouling composite reverse osmosis membrane, the specific implementation steps are as follows:

[0030] (1) Weigh 10g of clay mineral montmorillonite and disperse it in deionized water, add 2g of guanidine-based modifier (guanidinoacetic acid) and ultrasonically mix evenly, then add ammonia water drop by drop until the pH of the solution is 8-9, and heat up under stirring React at 35°C for 2 hours, then filter the resulting mixture with suction, wash with ethanol until neutral, freeze-dry and grind to obtain modified clay minerals for later use;

[0031] (2) Dissolve 20g of citric acid and 10g of sodium hydroxide in deionized water and mix them uniformly to prepare an acid-binding agent, then add 20g of m-phenylenediamine, 1g of dopamine and 1g of modified clay mineral to the above-mentioned acid-binding agent in sequence, Dilute to 1000g with deionized water, disperse ultrasonically for 30 minutes to form a modified aqueous solution, and...

Embodiment 2～5

[0037] The preparation method of the anti-biological fouling composite reverse osmosis membrane in Examples 2 to 5 is basically the same as that of Example 1, the only difference being: the addition of modified clay minerals and hydrophilic linking agent added in step (2) different, as shown in Table 1:

[0038] Table 1

[0039]

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Abstract

The invention belongs to the technical field of reverse osmosis membranes, and particularly relates to an anti-biological-pollution composite reverse osmosis membrane and a preparation method thereof.The preparation method comprises the following steps: (1) adding m-phenylenediamine, a hydrophilic coupling agent and modified clay minerals into an acid-binding agent, and carrying out ultrasonic dispersion to form a modified aqueous phase solution; (2) dissolving trimesoyl chloride into an organic solvent, and stirring until uniformly mixing to obtain a modified organic oil-phase solution; and(3) soaking a base membrane in the modified aqueous phase solution for 0.5-1 min, draining off redundant water drops on the surface, then soaking the base membrane in the modified organic oil phase solution, carrying out a reaction for 0.5-1 min, and drying to obtain the anti-biological-pollution composite reverse osmosis membrane. The anti-biological-pollution composite reverse osmosis membrane prepared by the invention has anti-biological-pollution performance and high water flux, so that the reverse osmosis membrane maintains excellent water flux and desalination rate in the long-term use process.

Description

technical field [0001] The invention belongs to the technical field of reverse osmosis membranes, and in particular relates to an anti-biological pollution composite reverse osmosis membrane and a preparation method thereof. Background technique [0002] With the increasing consumption of global water resources and the intensification of industrialization, the shortage of water resources will become one of the most important problems faced by human society in the 21st century. Therefore, water treatment technology has gradually attracted people's attention in recent years, and some new water treatment technologies have been developed in continuous research. Reverse osmosis membrane technology has been widely used in brackish water purification, seawater desalination, sewage reuse and other fields due to its compact device, convenient installation, low energy consumption, low investment, and good water quality. One of the most promising water treatment technologies in the fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D69/12B01D71/56B01D71/68
CPCB01D71/56B01D69/02B01D69/12B01D67/0002B01D61/025B01D71/68B01D2325/36B01D2325/48Y02A20/131
Inventor 周兴蒙单连杰向豪刘涛
Owner 恩泰环保科技(常州)有限公司
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