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A kind of nanofiltration membrane and its application

A technology of nanofiltration membrane and filter layer, applied in the field of nanofiltration membrane, can solve the problems of increased cost, poor selectivity, and increased operating pressure.

Inactive Publication Date: 2021-05-07
上海洁晟环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commercially available nanofiltration membranes are mainly nanofiltration membranes with negative charges on the surface, which mainly rely on the electrostatic steric effect to intercept positive metal ions. The nanofiltration membrane must be prepared with a smaller pore size, but this will lead to an increase in the operating pressure of the membrane, which will lead to an increase in the cost of the membrane separation process. In order to solve the above problems, people have studied the nanofiltration membrane with positive charges on the surface. Membranes, because the nanofiltration membranes containing positive charges are more hydrophilic, and have stronger repelling force for positively charged ions, the nanofiltration membranes containing positive charges on the surface have higher separation efficiency for high-valence ions. However, the existing Regardless of the surface electrical properties of the nanofiltration membrane obtained by the technology, its flux is small, and it is difficult to realize the selective separation of different types of ions. For example, a low-voltage positively charged hollow fiber nanofiltration membrane is disclosed in CN105498547A. After a long time of use, the flux is only 16.37L / (m 2 h bar), and the selective separation of high-valent metal ions and low-valent metal ions cannot be achieved, and the selectivity is poor

Method used

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  • A kind of nanofiltration membrane and its application
  • A kind of nanofiltration membrane and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Nanofiltration membrane 1 was prepared by the following steps:

[0040] In step (1), take an area of ​​10cm×10cm and a weight of 25g / m 2 Polyethylene terephthalate non-woven fabric, on one side of the non-woven fabric, use electrospinning equipment to deposit a layer of electrospun polyacrylonitrile nanofibers with a weight of 1g and a diameter of 150nm to obtain a base layer, and in the base layer The electrospun nanofiber layer is a porous structure with a pore size of 100 nm;

[0041] Step (2), one layer of bamboo fibrous dispersion liquid is coated on the side surface containing electrospun nanofibers of the base layer obtained in step (1), and the cellulose nanofiber layer with a weight of 0.1g is obtained after the solvent volatilizes naturally , wherein the cellulose nanofibers have a diameter of 50nm and a length of 5000nm;

[0042] Step (3), 10g number-average molecular weight is 500000Da polyethyleneimine, 0.8g anhydrous piperazine and 0.4g triethylamine are d...

Embodiment 2

[0044] Nanofiltration membrane 2 was prepared by the following steps:

[0045] The only difference with Example 1 is that the non-woven fabric used in step (1) has a grammage of 40g / m 2 The polyimide non-woven fabric, the electrospun nanofibers are electrospun polyvinyl alcohol nanofibers with a diameter of 300nm, and the obtained electrospun nanofiber layer has a porous structure with a pore diameter of 870nm.

[0046] Embodiment 2 obtains nanofiltration membrane 2.

Embodiment 3

[0048] Nanofiltration membrane 3 was prepared by the following steps:

[0049] The difference from Example 1 is that step (2) is to use electrospinning method to use cellulose cuproammonia solution as raw material to spin on the base layer to prepare a cellulose nanofiber layer, wherein the cellulose nanofiber diameter is 5nm, The length is 200nm.

[0050] Embodiment 3 obtains nanofiltration membrane 3.

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Abstract

The invention provides a nanofiltration membrane, which comprises a base layer, a cellulose nanofiber layer and a filter layer stacked in sequence, and at least one polyelectrolyte is uniformly dispersed in the filter layer, and the obtained Nanofiltration membrane is a kind of membrane that can flow more than 50L / m 2 The high-flux nanofiltration membrane used in the case of h bar, and the obtained nanofiltration membrane has ion selectivity, which can selectively separate monovalent metal ions and multivalent metal ions, especially for the interception of magnesium ions The rate can reach 97.93%, and the rejection rate for sodium ions is only 20.49%.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a nanofiltration membrane and its application. Background technique [0002] Membrane separation technology is a new technology developed in recent years. It has the advantages of energy saving, high quality, and almost no pollution. Among them, the nanofiltration membrane has a nano-scale pore size, which can effectively intercept divalent and above-divalent ions (such as calcium ions , magnesium ions, aluminum ions, etc.) and organic molecules with a molecular weight greater than 300Da, and generally have a high rejection rate. Compared with the traditional reverse osmosis separation of metal ions, the use of nanofiltration membranes to separate divalent and above metal ions has water With the advantages of high flux and low operating pressure, it has broad application prospects in water softening, desalination, wastewater treatment and other fields. [0003] At present, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/58B01D67/00B01D61/02
CPCB01D61/02B01D67/0006B01D67/0009B01D71/58B01D2323/39B01D2325/36
Inventor 张秀芳马洪洋李冬冬
Owner 上海洁晟环保科技有限公司
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