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Polyamide reverse osmosis membrane as well as preparation method and application thereof

A reverse osmosis membrane and polyamide technology, which is applied in the field of polyamide reverse osmosis membrane preparation, can solve the problems of low life, small water flux, and low reverse osmosis efficiency, so as to prolong life, prolong service life, and improve durability. The effect of UV properties

Inactive Publication Date: 2021-02-12
杭州鹿扬科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, reverse osmosis membrane, as a kind of filter membrane, has always been one of the concerns of people as to its service life and water permeability. The structure of many composite reverse osmosis membranes is multi-layered, although the desalination performance has been improved, but the long-term After use, due to the accumulation of dirt, the water flux becomes smaller, which reduces the efficiency of reverse osmosis and lowers its life.

Method used

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  • Polyamide reverse osmosis membrane as well as preparation method and application thereof
  • Polyamide reverse osmosis membrane as well as preparation method and application thereof
  • Polyamide reverse osmosis membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] This embodiment provides a zinc-doped carbon quantum dot:

[0087] Disperse 2g of citric acid and 1.2g of zinc acetate into 300mL of ultrapure water evenly, then add 2.5g of thiourea, mix well and heat at 185°C for 6 hours. After the reaction is completed, cool to room temperature to obtain a brown liquid, which is removed with a 0.22μm filter membrane. Large particles of impurities are then subjected to high-speed centrifugation at 12000r / min for 30 minutes to filter out small precipitates to obtain zinc-doped carbon quantum dots. Its electron microscope picture is as figure 1 As shown, it can be seen that it presents a regular spherical structure, good dispersion, high uniformity, and a particle size between 2 and 5nm; its infrared spectrum is shown in figure 2 Shown, display 3500~2600cm -1 The left and right regions contain the vibration characteristic peaks of O-H and N-H, and the 1700-1500cm -1 The left and right regions contain vibration characteristic peaks o...

Embodiment 2

[0089] This embodiment provides a carbon quantum dot, the preparation method of which is basically the same as that of Embodiment 1, except that zinc acetate is not added to the raw material.

Embodiment 3

[0091] This embodiment provides a carbon quantum dot, the preparation method of which is basically the same as that of Embodiment 1, except that the thiourea in the raw material is replaced by ethylenediamine.

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Abstract

The invention relates to the technical field of reverse osmosis membrane materials, in particular to a polyamide reverse osmosis membrane, a preparation method and application thereof, the polyamide reverse osmosis membrane comprises a polymer porous support membrane and a polyamide functional layer compounded on the surface of the polymer porous support membrane; wherein zinc-doped carbon quantumdots and gamm-polyglutamic acid / chitosan nano particles are uniformly distributed in the polyamide functional layer; the preparation method comprises the following steps: adding zinc-doped carbon quantum dot particles and gamma-polyglutamic acid / chitosan nano particles into an aromatic polyacyl chloride oil-phase solution and / or a polyamine water-phase solution, and uniformly dispersing; and dip-coating one side of the polymer porous support membrane with an aqueous phase solution, then dip-coating the same side with an oil phase solution, extruding with a rubber roller, carrying out heat treatment, and rinsing with deionized water. The polyamide reverse osmosis membrane has the advantages of being large in water flux, high in rejection rate, good in antibacterial rate, long in service life, resistant to ultraviolet rays and the like, and can be suitable for long-time and high-load work in a special working condition environment.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis membrane materials, in particular to a polyamide reverse osmosis membrane, a preparation method and an application thereof. Background technique [0002] The reverse osmosis membrane is the core component to realize reverse osmosis. It is an artificial semipermeable membrane with certain characteristics made by simulating biological semipermeable membrane. Generally made of polymer materials. Such as cellulose acetate film, aromatic polyhydrazide film, aromatic polyamide film. The diameter of surface micropores is generally between 0.5 and 10nm, and the permeability is related to the chemical structure of the membrane itself. Some polymer materials have good repellency to salt, but the water penetration rate is not good. Some polymer materials have more hydrophilic groups in their chemical structure, so the water penetration rate is relatively fast. Therefore, a satisfactory reverse os...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D71/56B01D69/10B01D69/02B01D67/00
CPCB01D61/025B01D67/0079B01D69/02B01D69/105B01D71/56B01D2325/36B01D2325/48
Inventor 不公告发明人
Owner 杭州鹿扬科技有限公司
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