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Hollow fiber forward osmosis composite membrane containing oriented carbon nanotubes and preparation method thereof

A technology of carbon nanotubes and composite membranes, applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems that it is difficult to give full play to the transmission function of carbon nanotube molecular channels, and achieve excellent separation characteristics and high density , Improve the effect of salt rejection rate

Active Publication Date: 2020-06-19
中国人民解放军火箭军工程设计研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Whether adding carbon nanotubes to hollow fiber membranes or directly preparing hollow fiber membranes using carbon nanotubes, carbon nanotubes are in a random and disordered state, and it is difficult to give full play to the transport function of carbon nanotube molecular channels.

Method used

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  • Hollow fiber forward osmosis composite membrane containing oriented carbon nanotubes and preparation method thereof
  • Hollow fiber forward osmosis composite membrane containing oriented carbon nanotubes and preparation method thereof
  • Hollow fiber forward osmosis composite membrane containing oriented carbon nanotubes and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] This embodiment provides a kind of preparation method that contains 1% (wt) oriented carbon nanotube hollow fiber membrane, and the operation process is as follows figure 1 As shown, the specific steps are as follows:

[0047] (1) Disperse 0.2g acidified multi-walled carbon nanotubes in 80g N-N dimethylformamide, disperse evenly after ultrasonic 2h, add 1g polyvinylpyrrolidone (weight average molecular weight is 2000) and 18.8g polysulfone (weight-average molecular weight is 30000), after stirring 4h, forms uniform casting solution;

[0048] (2) Pour the casting solution into the still of the spinning machine, seal the still of the spinning machine, heat the still of the spinning machine so that the temperature of the spinning material liquid is at 25° C., and perform vacuum degassing treatment for 30 minutes. After the degassing treatment of the spinning material liquid, open the outlet switch of the kettle, feed nitrogen into the kettle to pressurize, turn on the swi...

Embodiment 2-4

[0052] Only changing the content of modified carbon nanotubes to 0.05g, 0.5g and 1g, the amount of polysulfone correspondingly becomes 18.95g, 18.5g, 18g, other operations are the same as in Example 1, and the densities of the obtained aligned carbon nanotubes are respectively averaged 1, 3.2, and 4.5 per square micron, and the forward osmosis characteristics of the obtained hollow fiber composite membrane were measured, and the results are shown in Table 1.

Embodiment 5

[0054] The implementation is the same as in Example 1, only the type of carbon nanotubes is changed, and the acidified single-walled carbon nanotubes are selected. The density of the obtained oriented carbon nanotubes is respectively averaged at 2.9 per square micron, and the forward osmosis of the obtained hollow fiber composite membrane is measured. properties, and the results are shown in Table 1.

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Abstract

The invention provides a hollow fiber forward osmosis composite membrane containing oriented carbon nanotubes and a preparation method thereof. The composite membrane comprises a bottom membrane and acompact barrier layer, wherein the bottom membrane is composed of a hollow fiber membrane, and the compact barrier layer covers the bottom membrane. The bottom membrane contains modified carbon nanotubes, orientated carbon nanotubes are exposed on the surface in contact with the compact barrier layer through plasma or wet etching, one ends of the orientated carbon nanotubes are buried in the bottom membrane, and the other ends of the orientated carbon nanotubes extend into the compact barrier layer. The density and distribution of the carbon nanotubes in the composite membrane are controllable, the oriented arrangement of the carbon nanotubes in the membrane material can be realized, and the separation performance can be obviously improved.

Description

technical field [0001] The invention relates to the field of nanocomposite material preparation, in particular to a hollow fiber forward osmosis composite membrane containing oriented carbon nanotubes and a preparation method thereof. Background technique [0002] Membrane separation is a separation process based on the principle of sieving and driven by pressure. The process does not involve phase transition, is easy to operate and low in cost, and has attracted much attention in the field of separation in recent years. The separation membrane used in this process can effectively remove particles, colloids, bacteria, heat sources and high-molecular organic substances in water, and is widely used in the separation, concentration and purification of substances. The organic hollow fiber membrane is self-supporting because of its fiber-like shape. Compared with the flat membrane, it has the characteristics of large specific surface area, high separation efficiency, simple stru...

Claims

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Application Information

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IPC IPC(8): B01D71/76B01D69/12B01D69/08B01D69/02B01D67/00B01D61/00
CPCB01D61/002B01D67/0079B01D69/02B01D69/08B01D69/12B01D71/021B01D71/76
Inventor 赵海洋何明清连培聪张林
Owner 中国人民解放军火箭军工程设计研究院
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