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A composite nanofiltration membrane containing modified carbon nanotubes and its preparation method

A composite nanofiltration membrane and carbon nanotube technology, applied in the fields of carbon compounds, chemical instruments and methods, membrane technology, etc., can solve the problems of long reaction time, low pure water flux of ultrafiltration membrane, etc., and achieve a simple modification method. , good industrial production basis, the effect of broad application prospects

Active Publication Date: 2019-09-10
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent requires three immersion processes of oil phase-water phase-oil phase, the reaction time is long, and the pure water flux of the prepared ultrafiltration membrane is not high

Method used

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  • A composite nanofiltration membrane containing modified carbon nanotubes and its preparation method
  • A composite nanofiltration membrane containing modified carbon nanotubes and its preparation method
  • A composite nanofiltration membrane containing modified carbon nanotubes and its preparation method

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preparation example Construction

[0028] The embodiment of the present invention provides the above-mentioned preparation method of modified carbon nanotubes, comprising the following steps:

[0029] Disperse carbon nanotubes in water, add tannic acid solution, add iron salt solution after dispersion, and react under stirring to obtain modified carbon nanotubes.

[0030] Specifically, ultrasonically disperse carbon nanotubes in water, add tannic acid solution for ultrasonication for a period of time, then add iron salt solution, react for a period of time under stirring, centrifuge, wash with deionized water, and freeze-dry to obtain modified carbon nanotubes. Further, in a preferred embodiment of the present invention, the carbon nanotubes are selected from one or more of single-walled carbon nanotubes, multi-walled carbon nanotubes, native carbon nanotubes, and modified carbon nanotubes. It can be understood that the modified carbon nanotubes may be carboxylated carbon nanotubes, hydroxylated carbon nanotube...

Embodiment 1

[0053] A kind of modified carbon nanotube provided by the present embodiment is prepared according to the following steps:

[0054] First, the content of 0.1wt% carbon nanotubes (multi-walled, OD3+ The molar ratio to tannic acid is 5 / 2), reacted for 1 min under stirring, centrifuged and washed with deionized water, and freeze-dried to obtain modified carbon nanotubes.

Embodiment 2

[0056] A kind of modified carbon nanotube provided by the present embodiment is prepared according to the following steps:

[0057] Firstly, carbon nanotubes with a content of 0.2wt% are ultrasonically dispersed in an aqueous solution, tannic acid solution (the weight ratio of tannic acid and carbon nanotubes is 5 / 1) is ultrasonically dispersed for 0.5h, and ferric chloride solution (Fe 3+ The molar ratio with tannic acid is 2 / 1), reacted with stirring for 0.5min, centrifuged and washed with deionized water, and freeze-dried to obtain modified carbon nanotubes.

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Abstract

The invention provides a modified carbon nanotube and a composite nanofiltration membrane, and preparation methods thereof, belonging to the technical field of membranes. The modified carbon nanotube is prepared by coating the outer wall of a carbon nanotube with a layer of tannic acid and a Fe<3+> chelated and cross-linked functional layer in virtue of modification of tannic acid and a ferric salt. A modification process is simple; reaction conditions are mild; cost is low; and the prepared modified carbon nanotube has excellent dispersibility. An aromatic polymer functional surface layer of a porous supporting membrane is loaded with the modified carbon nanotubes in situ through interfacial polymerization so as to obtain the composite nanofiltration membrane containing the modified carbon nanotubes. The modified carbon nanotubes are loaded onto the membrane and interact with a surface-layer polymer via chemical bonds, so the water flux, hydrophilicity and anti-pollution performance of the composite nanofiltration membrane are improved, and the prepared composite nanofiltration membrane has a stable structure and improved chlorine resistance. The composite nanofiltration membrane is simple in production process, low in cost and substantially improved in comprehensive properties, can be industrially produced and has good application prospects.

Description

technical field [0001] The invention relates to the field of membrane technology, and in particular to a composite nanofiltration membrane containing modified carbon nanotubes and a preparation method thereof. Background technique [0002] Nanofiltration is a membrane process between reverse osmosis and ultrafiltration, with pore sizes in the range of a few nanometers. The nanofiltration process has a poor interception effect on monovalent ions and organic compounds with a molecular weight below 200Da, but has a high removal rate for divalent or multivalent ions and organic compounds with a molecular weight between 200-1000Da. It has been widely used in The softening of water, decolorization of solutions, desalination and concentration of dyes and purification and concentration of biochemical substances have produced certain economic and social benefits. The application of inorganic nanoparticle materials in the preparation of nanofiltration membranes to improve the perform...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02C01B32/168
Inventor 吴慧青刘跃军洪伟杰毛龙
Owner XIAMEN UNIV OF TECH
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