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A kind of hollow fiber composite nanofiltration membrane and preparation method thereof

A fiber composite and nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of difficult application of base membranes and restrictions on wide application, and achieve high water flux and broad application prospects , the effect of mild reaction conditions

Active Publication Date: 2019-06-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to prepare ultrafiltration base membrane first, which is difficult to apply to various base membranes available in the market, which greatly limits the wide application of this method

Method used

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  • A kind of hollow fiber composite nanofiltration membrane and preparation method thereof
  • A kind of hollow fiber composite nanofiltration membrane and preparation method thereof
  • A kind of hollow fiber composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Dissolve 5g of polyphenolic compound catechol and 10g of polyamino compound polyethyleneimine in 1L of water to obtain aqueous solution A; dissolve 0.5g of oxidant ammonium persulfate in 100mL of water to obtain aqueous solution B; ultrafilter No. 1 hollow fiber polysulfone The membrane (purchased from Hangzhou Haotian Membrane Technology Co., Ltd.) is immersed in the aqueous solution A (keep the interior of the fiber dry), and the aqueous solution B is driven into the interior of the hollow fiber by pressure and filled.

[0050] The hollow fiber membrane was left to stand at 40° C. for 30 minutes in such a state, and then washed with water and dried to obtain a hollow fiber composite nanofiltration membrane.

[0051] The scanning electron microscope image of the prepared hollow fiber composite nanofiltration membrane section is shown in figure 1 shown.

Embodiment 2～6

[0053] Adjust the concentration of polyphenolic compound catechol to be 0.1g / L, 1g / L, 10g / L, 20g / L, 100g / L, and the concentration of polyamino compound polyethyleneimine to be 0.2g / L, 2g / L , 30g / L, 40g / L, 200g / L, the concentration of oxidant ammonium persulfate is 5g / L constant, all the other conditions are with embodiment 1.

Embodiment 7～10

[0060] Adjust the concentration of oxidant to 0.1g / L, 1g / L, 10g / L, 100g / L, the concentration of polyphenolic compound catechol is 5g / L, the concentration of polyamino compound polyethyleneimine is 10g / L, and other conditions With embodiment 1.

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Abstract

The invention discloses a preparation method of a hollow fiber composite nano-filtration membrane. The preparation method comprises: immersing an outer surface of a hollow fiber supporting membrane into a water solution A containing a polyphenol compound and a multi-amino compound; injecting a water solution B containing an oxidant into the hollow fiber supporting membrane; reacting at 0 to 95 DEG C for 1min to 300min and taking out the hollow fiber supporting membrane; draining a solution on the surface of the hollow fiber supporting membrane; carrying out drying treatment to obtain the hollow fiber composite nano-filtration membrane. The preparation method can be widely applied to preparation of hollow fiber composite nano-filtration membranes with different base membranes, and rejection performance of the prepared composite nano-filtration membrane is not influenced by base membrane structures; the preparation method is simple in operation process and moderate in reaction conditions, is suitable for continuous production, and has a good industrial production foundation and a wide application prospect.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a hollow fiber composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration is a new type of membrane separation technology, and its separation performance is between ultrafiltration membrane and reverse osmosis membrane. It has a high rejection rate for multivalent salt ions and some organic molecules (200-2000 molecular weight), and can have a higher flux at a lower operating pressure, thereby saving operation and maintenance costs. Therefore, nanofiltration membranes have attracted widespread attention from industry and science, and have been widely used in water softening, wastewater treatment, food processing, separation and purification of chemical synthesis products, and other fields. [0003] Hollow fiber composite nanofiltration membrane is an important type of nanofiltration membrane. It has the characteristics of h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/08B01D69/10B01D69/12B01D71/16B01D71/42B01D71/68
CPCB01D67/0006B01D69/08B01D69/10B01D69/125B01D71/16B01D71/42B01D71/68
Inventor 徐志康杜勇邱文泽郭毅吕嫣仲启智
Owner ZHEJIANG UNIV
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