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A polyamide composite reverse osmosis membrane with anti-biological fouling properties and preparation method thereof

A technology of anti-biological fouling and reverse osmosis membrane, applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of polyamide composite reverse osmosis membrane biofouling, etc., to ensure long-term effectiveness and overcome limitations The effect of simple and easy preparation method

Active Publication Date: 2022-05-17
自然资源部天津海水淡化与综合利用研究所
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to propose a new polyamide composite reverse osmosis membrane with anti-biological fouling properties and its preparation method for the problem that polyamide composite reverse osmosis membrane is prone to biofouling

Method used

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  • A polyamide composite reverse osmosis membrane with anti-biological fouling properties and preparation method thereof
  • A polyamide composite reverse osmosis membrane with anti-biological fouling properties and preparation method thereof
  • A polyamide composite reverse osmosis membrane with anti-biological fouling properties and preparation method thereof

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preparation example Construction

[0037] The present invention also provides a method for preparing a polyamide composite reverse osmosis membrane with anti-biological fouling properties, comprising the following steps: (1) preparation of a polyamide composite reverse osmosis membrane: covering the porous ultrafiltration membrane support layer by interfacial polymerization Aromatic polyamide separation layer to obtain polyamide composite reverse osmosis membrane; (2) preparation of modification solution: dissolve the anti-adhesion unit or its precursor, the water-soluble inorganic salt corresponding to the antibacterial unit, the structure adjustment unit and the auxiliary agent in A buffer solution to obtain a modified solution; that is, the modified solution is a buffer solution comprising an anti-adhesion unit or its precursor, a water-soluble inorganic salt corresponding to a bacteriostatic unit, a structural adjustment unit and an auxiliary agent; (3) anti-biological pollution function Modification of ingr...

Embodiment 1

[0079] The preparation method of the polyamide composite reverse osmosis membrane with anti-biological fouling properties in the present embodiment is as follows: the polyamide composite reverse osmosis membrane prepared in Comparative Example 1 is used as the membrane to be modified, and the surface of the membrane is mixed with dopamine hydrochloride 2g / L , copper sulfate 5mM, taurine 2g / L, hydrogen peroxide 20mM tris-hydrochloric acid weak alkaline buffer solution (pH 8.5, concentration 50mM) at 25°C for 60min; then rinse with a large amount of pure water On the surface of the membrane, a polyamide composite reverse osmosis membrane with anti-biological fouling properties is obtained.

[0080] The polyamide composite reverse osmosis membrane obtained in Example 1 was tested for anti-adhesion performance and antibacterial performance, and the test method was the same as that of Comparative Example 1. The measured performance data are shown in Table 1.

Embodiment 2

[0082] The preparation method of the polyamide composite reverse osmosis membrane with anti-biological fouling properties in the present embodiment is as follows: the polyamide composite reverse osmosis membrane prepared in Comparative Example 1 is used as the membrane to be modified, and the surface of the membrane is mixed with dopamine hydrochloride 2g / L , copper sulfate 5mM, β-alanine 2g / L, hydrogen peroxide 20mM tris-hydrochloric acid weak alkaline buffer solution (pH 8.5, concentration 50mM) contacted at 25 ℃ for 60min; Wash the surface of the membrane with water to obtain a polyamide composite reverse osmosis membrane with anti-biological fouling properties.

[0083] The polyamide composite reverse osmosis membrane obtained in Example 2 was tested for anti-adhesion performance and antibacterial performance, and the test method was the same as that of Comparative Example 1. figure 1 It is a laser confocal scanning microscope picture, and it can be seen that the number of...

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Abstract

The invention belongs to the technical field of organic membrane materials, and specifically relates to a polyamide composite reverse osmosis membrane with anti-biological pollution characteristics and a preparation method thereof. The polyamide composite reverse osmosis membrane includes a porous ultrafiltration membrane support layer and an aromatic polyamide separation layer and anti-biological fouling functional components; the aromatic polyamide separation layer is covered on the porous ultrafiltration membrane support layer, and the aromatic polyamide separation layer is covered with anti-biological fouling functional components to form a polyamide composite reverse osmosis membrane with anti-biological fouling properties. The anti-biological pollution functional component of the present invention is a ternary homogeneous mixed system comprising anti-adhesion units, antibacterial units and structural adjustment units, which uniformly covers the surface of the aromatic polyamide separation layer through a one-step co-deposition method. The prepared membrane can reduce the adhesion of microorganisms on the membrane surface and inhibit the proliferation of microorganisms on the membrane surface; the synergy of anti-adhesion and antibacterial functions greatly improves the anti-biological fouling ability of the polyamide composite reverse osmosis membrane.

Description

technical field [0001] The invention belongs to the technical field of organic membrane materials, and in particular relates to a reverse osmosis membrane and a preparation method thereof, in particular to a polyamide composite reverse osmosis membrane with anti-biological pollution characteristics and a preparation method thereof. Background technique [0002] Polyamide composite reverse osmosis membrane has good selective permeability and physical and chemical stability, and is widely used in many scenarios such as seawater / brackish water desalination and municipal sewage treatment. However, due to the inherent hydrophobicity, charge and high roughness of the surface of the polyamide layer, it is very easy to adhere to various organic / inorganic / colloidal pollutants and microorganisms in the water, so that the water production and water quality Significantly decreased, water production energy consumption increased. Especially for microorganisms, which have proliferative pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D71/56B01D71/68
CPCB01D61/025B01D71/68B01D71/56B01D67/0006B01D67/0081B01D67/0083B01D67/0088B01D69/02B01D2325/48Y02A20/131
Inventor 张潇泰赵曼于慧王剑孙玮
Owner 自然资源部天津海水淡化与综合利用研究所
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