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A method for preparing superhydrophilic organic membranes based on nano-hydrotalcites

A hydrotalcite and organic membrane technology, applied in the field of membrane separation, can solve the problems of organic membranes being easily polluted and operating costs, and achieve excellent long-term anti-pollution performance, high-efficiency retention, and improved retention performance

Active Publication Date: 2021-04-13
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the problem that the organic membrane is easily polluted in the existing membrane separation technology, which leads to an increase in operating costs. The ingenious fusion of technologies has realized the superhydrophilization of the surface of the organic membrane, and provides a method for preparing a superhydrophilic organic membrane based on nano-hydrotalcite, which is characterized in that it includes the following steps:

Method used

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  • A method for preparing superhydrophilic organic membranes based on nano-hydrotalcites
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  • A method for preparing superhydrophilic organic membranes based on nano-hydrotalcites

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preparation example Construction

[0042] The present invention provides a method for preparing a super-hydrophilic organic membrane based on nano-like hydrotalcite. According to the embodiment of the present invention, the implementation flowchart is shown in figure 1 , which includes the following steps:

[0043] S100, nano-hydrotalcite surface modification

[0044] The nano-type hydrotalcite suspension containing amino functional groups is prepared according to the steps of the present invention. Based on the total mass of the obtained suspension, the content of the nano-type hydrotalcite is 0.1wt%-30wt%; the configured mass content is 13wt%-17wt% % magnesium nitrate and 5.6wt%-9wt% aluminum nitrate mixed aqueous solution; configure 26%-40% volume content (3-aminopropyl) triethoxysilane ethanol solution; configure at 70 degrees Celsius Aqueous sodium dodecyl sulfonate solution with mass content of 4.8wt%-8wt%; add magnesium nitrate / aluminum nitrate salt solution and (3-aminopropane) dropwise to the sodium d...

Embodiment 1

[0050] 1. Nano-hydrotalcite surface modification

[0051] To prepare the amino functional group-containing nano-hydrotalcite suspension with a mass content of 15wt%, according to the preparation steps of the present invention, the preparation conditions adopted are: the mass content of magnesium nitrate is 15wt%, and the mass content of aluminum nitrate is 7.3wt% ; The volume content of (3-aminopropyl) triethoxysilane is 33%; the mass content of sodium dodecyl sulfonate is an aqueous solution of 6.4 wt%; the mixing rate of the three solutions is 0.02 mL / s, and the mixing ratio is 4 :4:3; heated at a constant temperature of 70 degrees Celsius for 12 hours.

[0052] 2. Selection and treatment of surface carboxyl organic film

[0053] A carboxymethyl cellulose membrane was selected and immersed in a catalyst aqueous solution containing 5mmol / L N-hydroxysuccinimide, 2mmol / L 1-(3-dimethylaminopropyl)-3-ethylcarbon Diimine hydrochloride, 10 mmol / L 2-(N-morpholinyl)ethanesulfonic a...

Embodiment 2

[0058] 1. Nano-hydrotalcite surface modification

[0059] To prepare the amino functional group-containing nano-hydrotalcite suspension with a mass content of 30 wt %, according to the preparation steps of the present invention, the adopted preparation conditions are: the mass content of magnesium nitrate is 17 wt %, and the mass content of aluminum nitrate is 9 wt %; The volume content of (3-aminopropyl)triethoxysilane is 40%; the mass content of sodium dodecylsulfonate is an aqueous solution of 8wt%; the mixing rate of the three solutions is 0.1mL / s, and the mixing ratio is 4:4 : 3; heated at a constant temperature of 70 degrees Celsius for 13 hours.

[0060] 2. Selection and treatment of surface carboxyl organic film

[0061] A carboxymethyl cellulose membrane was selected and immersed in a catalyst aqueous solution containing 5mmol / L N-hydroxysuccinimide, 2mmol / L 1-(3-dimethylaminopropyl)-3-ethylcarbon Diimine hydrochloride, 10mmol / L 2-(N-morpholinyl)ethanesulfonic acid ...

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Abstract

The invention discloses a method for preparing a super-hydrophilic organic membrane based on nano-hydrotalcites. The method comprises: (1) providing nano-hydrotalcite suspensions containing amino functional groups; (2) providing organic membranes with carboxyl functional groups on the surface; (3) immersing the organic membrane in the catalyst aqueous solution; (4) immersing the organic membrane in the nano hydrotalcite suspension to obtain a super-hydrophilic organic membrane. The organic membrane prepared by the invention has functions such as superhydrophilicity and anti-pollution, and has good application prospects in the field of membrane separation.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a super-hydrophilic organic membrane based on nano-type hydrotalcite. Background technique [0002] At present, my country is facing the water crisis of water shortage and serious water pollution, which has become one of the main factors restricting the sustainable development of my country's economy and society. In order to effectively alleviate the water resources crisis in my country, it is necessary to start from two perspectives: the development of water supply sources and the control of water pollution. Sewage recycling provides a new source of water resources while reducing sewage discharge. It has the characteristics of low cost, great potential, wide applicability and environmental friendliness. It is one of the practical and effective measures to solve the current water environment problems in my country. one. [0003] Me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/10B01D71/34B01D71/42B01D71/68B01D69/02B01D67/00
CPCB01D67/0006B01D69/02B01D71/10B01D71/34B01D71/42B01D71/68B01D2325/36
Inventor 梁帅张塽陈冠浩马智波高艳珊李敏
Owner BEIJING FORESTRY UNIVERSITY
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