Preparation method for super-hydrophilic carbon nanotube nano-porous membrane

A carbon nanotube and nanoporous technology, which is applied in the field of preparation of superhydrophilic carbon nanotube nanoporous films, can solve the problems of nanomaterial agglomeration and poor interfacial compatibility, complex synthesis process, limited application and the like, and achieves improved distribution, The process is simple and the effect of avoiding the generation of structural defects in the film

Active Publication Date: 2019-07-23
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0004] However, by summarizing the current work on the preparation of superhydrophilic carbon nanotube nanoporous membranes by using hydrophilic inorganic nanomaterials, we found that the synthesis process of carbon nanotubes surface-modified by hydrophilic inorganic nanomaterials is usually complicated, which limits Its application in the preparation of superhydrophilic carbon nanotube nanoporous membranes; the modification method of directly depositing hydrophilic inorganic nanomaterials on the surface of carbon nanotube nanoporous membranes is difficult to avoid the problems of nanomaterial agglomeration and poor interfacial compatibility. ; Introducing mineralized precursors into carbon nanotube nanoporous membranes to generate hydrophilic inorganic nanomaterials in situ. The controllable distribution and interface stability problems in the interior limit the applicability of this method

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  • Preparation method for super-hydrophilic carbon nanotube nano-porous membrane

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Embodiment 1

[0033] In this embodiment, a method for preparing a superhydrophilic carbon nanotube nanoporous membrane comprises the following steps:

[0034] (1) Taking carbon nanotubes, tannic acid, and chitosan as raw materials, adding the raw materials and water into a beaker, adjusting the pH of the dispersion to 3, and ultrasonically dispersing for 30 minutes to obtain a carbon nanotube dispersion; Carbon nanotubes are carboxylated carbon nanotubes, and the concentration of the carbon nanotubes in the dispersion is 0.1 mg / mL; the mass ratio of the tannic acid to chitosan is 1:1; the carbon nanotubes and tannin The acid mass ratio is 1:4;

[0035] (2) After standing the carbon nanotube dispersion obtained in step (1) for 12 hours, centrifuge at a speed of 8000r / min for 20 minutes, take the supernatant, and then dilute it 25 times;

[0036] (3) The carbon nanotube dispersion liquid after the step (2) gained dilution is filtered on the microfiltration bottom membrane under the vacuum co...

Embodiment 2

[0041] In the present embodiment, the processing steps of a preparation method of a superhydrophilic carbon nanotube nanoporous membrane are the same as in Example 1, the difference is only that the mass ratio of carbon nanotubes and tannic acid described in step (1) is 1:16, in step (4), immerse the carbon nanotube film in a titanium lactate solution with a volume of 20mL and a concentration of 15mg / mL, and soak at 20°C for 2h.

[0042] CNT@CS / TA-TiO prepared by the above examples 2 The surface of the nanoporous membrane is a porous structure, and the titanium dioxide nanoparticles are evenly distributed on the surface of the membrane; the hydrophilicity of the membrane is expressed by the data of the water contact angle on the surface of the membrane and the infiltration time. For the data, see Figure 7 , Figure 8 , the initial water contact angle value on the film surface is 65.7°, and the water droplet is completely infiltrated within 10s, showing that CNT@CS / TA-TiO 2 ...

Embodiment 3

[0044] In this embodiment, the process steps of a preparation method of a superhydrophilic carbon nanotube nanoporous membrane are the same as in Example 1, except that the carbon nanotube membrane is soaked in a volume of 30mL, 1wt % ZrOCl 2 .8H 2 Soak in a mixed solution of O and 0.1mol / L hydrochloric acid for 6 hours at 80°C.

[0045] CNT@CS / TA-ZrO prepared by the above examples 2 The surface of the nanoporous membrane is a porous structure, and the zirconia nanoparticles are evenly distributed on the surface of the membrane; the hydrophilicity of the membrane is expressed by the water contact angle data on the surface of the membrane and the infiltration time. For the data, see Figure 7 , Figure 8 , the initial water contact angle value on the film surface is 16.1°, and the water droplet is completely infiltrated within 1s, showing that CNT@CS / TA-ZrO 2 Nanoporous membranes exhibit superhydrophilic properties.

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Abstract

The invention relates to a preparation method for a super-hydrophilic carbon nanotube nano-porous membrane. The method comprises the following steps: adding a carbon nanotube, tannic acid and chitosaninto water, regulating pH (Potential of Hydrogen), and carrying out ultrasonic dispersion to form dispersion liquid; after standing, carrying out vacuum filtering on the diluted dispersion liquid toa mixed cellulose membrane to obtain a carbon nanotube self-assembled membrane; after the carbon nanotube self-assembled membrane is subjected to vacuum drying, dipping into a metal ion solution, taking out the membrane after a period of time, and washing and drying to obtain the super-hydrophilic carbon nanotube nano-porous membrane. The preparation method has the advantages of simple process, easy operation and low cost, and the obtained carbon nanotube nano-porous membrane has a super-hydrophilicity characteristic.

Description

technical field [0001] The invention relates to a preparation method of a superhydrophilic carbon nanotube nanoporous film. Background technique [0002] Nanoporous membrane is a membrane material with a porous structure assembled from nanomaterials. The structural characteristics of nanoporous membranes lie in their porous surface with high nanopore density and highly connected porous network inside. The outstanding advantage of this type of membrane is that it has high water flux. At present, the nanomaterials used to prepare nanoporous membranes mainly include carbon nanotubes, graphene, nanofibers, metal-organic frameworks (MOFs), etc. Among them, carbon nanotubes with a specific one-dimensional structure show excellent performance in the preparation of nanoporous membranes. Unique advantages, its outstanding features are: ultra-thin self-supporting structure with adjustable thickness, nano-scale pore structure and high specific surface area to achieve high flux; networ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/02B01D67/00
CPCB01D71/021B01D69/02B01D67/0079B01D2325/36
Inventor 赵雪婷成丽娟贾宁王若希
Owner ZHEJIANG UNIV OF TECH
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