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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  • 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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Example Embodiment

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

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

[0030] Specifically, the carbon nanotubes are ultrasonically dispersed in water, the tannic acid solution is added to ultrasonically for a period of time, and then the iron salt solution is added, the reaction is performed for a period of time under stirring, centrifuged, washed with deionized water, and freeze-dried 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-wall carbon nanotubes, multi-wall carbon nanotubes, primary carbon nanotubes, and modified carbon nanotubes. It can be understood that the modified carbon nanotubes may be ...

Example Embodiment

[0052] Example 1

[0053] The modified carbon nanotube provided in this embodiment is prepared according to the following steps:

[0054] First, the content of 0.1wt% carbon nanotubes (multi-wall, OD 3+ The molar ratio to tannic acid is 5 / 2), react for 1 min under stirring, centrifuge, wash with deionized water, and freeze-dry to obtain modified carbon nanotubes.

Example Embodiment

[0055] Example 2

[0056] The modified carbon nanotube provided in this embodiment is prepared according to the following steps:

[0057] First, disperse the carbon nanotubes with a content of 0.2wt% ultrasonically in the aqueous solution, add a tannic acid solution (the weight ratio of tannic acid to carbon nanotubes is 5 / 1) and ultrasonic for 0.5h, add a ferric chloride solution (Fe 3+ The molar ratio to tannic acid is 2 / 1), reacted for 0.5 min under stirring, centrifuged, 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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