Preparation method of ultrafiltration membrane with enhanced antibacterial property by using modified carbon nanotubes

A technology of carbon nanotube modification and ultrafiltration membrane, which is applied in the direction of chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of enhancing membrane antibacterial property, pollution, microbial contamination, etc., and achieve good antibacterial property, The effect of inhibiting biological contamination and simple preparation method

Active Publication Date: 2013-03-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no matter what kind of ultrafiltration membrane it is, the pollution problem during its use has always been the main problem that plagues its wide application, among which microbial pollution is the most serious.
[0011] Carbon nanotubes have good antibacterial properties, and related research began in 2004. The research group of Elimelech Menachem of Yale University and Pedro J.J.Alvarez of Rice University conducted detailed explorations on the antibacterial properties and bacterial toxicity of carbon nanotubes (1. Kang, Seoktae, Herzberg, Moshe, Rodrigues, Debora F., Elimelech, Menachem. Antibacterial Effects of Carbon Nanotubes: Size Does Matter. Langmuir, 2008, 24(13): 6409-6413.2. Li, Qilin, Mahendra, Shaily, Lyon, Delina Y, Brunet, Lena, Liga, Michael V, Li, Dong, Alvarez, Pedro J.J.. Antimicrobial nanoparticles for water disinfection and microbial control: Potential applications and implications. Water Research, 2008, 42(18): 4591-4602.), However, there are no studies and reports on the use of carbon nanotubes to enhance the antibacterial properties of membranes.

Method used

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  • Preparation method of ultrafiltration membrane with enhanced antibacterial property by using modified carbon nanotubes
  • Preparation method of ultrafiltration membrane with enhanced antibacterial property by using modified carbon nanotubes
  • Preparation method of ultrafiltration membrane with enhanced antibacterial property by using modified carbon nanotubes

Examples

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Embodiment 1

[0042] This example provides a method for preparing a polysulfone membrane containing 0.4% modified carbon nanotubes, the specific steps are as follows:

[0043] (1) The original multi-walled carbon nanotubes were placed in an oxidizing solution (potassium permanganate: concentrated sulfuric acid: concentrated nitric acid = 1:3:1) for ultrasonic reaction at 80°C for 6 hours, then diluted with a large amount of deionized water, and then used The microfiltration membrane with a pore size of 0.2 μm was subjected to vacuum filtration to remove carbon residue and some impurities, and the product was washed with deionized water several times until neutral, and finally dried in a vacuum oven at 70°C for 24 hours to obtain the oxidized multi-walled carbon nanotubes;

[0044] (2) disperse 0.4g oxidized multi-walled carbon nanotubes in 80.6g N-N dimethylacetamide under ultrasonic conditions, disperse evenly after ultrasonic 2h, add 1g polyvinylpyrrolidone and 18g polysulfone, after sti...

Embodiment 2～3

[0055] Only change the content of modified carbon nanotubes to 0.04% and 0.1%, and other operations are the same as in Example 1. The obtained modified carbon nanotube polysulfone membranes have different antibacterial effects, and the antibacterial effects are all good. See Figure 5 .

Embodiment 4

[0057] The oxidation treatment was replaced by isocyanation treatment, and other operations were the same as in Example 1. The antibacterial effect of the obtained modified carbon nanotube polysulfone membrane was more significant, and the 3-hour lethality rate of Escherichia coli could reach 95%.

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Abstract

The invention discloses a preparation method of an ultrafiltration membrane with enhanced antibacterial property by using modified carbon nanotubes. The preparation method comprises the following steps of: modifying carbon nanotubes; drying; adding an organic solvent into the modified carbon nanotubes; dispersing the modified carbon nanotubes in the organic solvent uniformly; adding a membrane additive and membrane materials; blending uniformly to obtain a membrane casting solution; pouring the membrane casting solution to the surface of a flat plate after vacuum defoaming; scraping stably and rapidly with a scraper; and placing the flat plate in a gel phase to obtain the ultrafiltration membrane. The addition of the modified carbon nanotubes can be used for improving the antibacterial property of the ultrafiltration membrane, and improving the resistance of the ultrafiltration membrane to other pollutants to a certain extent, so that the ultrafiltration membrane has wide application value. The preparation method provided by the invention is simple and easy to apply in industrial production.

Description

technical field [0001] The invention relates to the technical field of preparation of ultrafiltration membranes, in particular to a preparation method of an ultrafiltration membrane using modified carbon nanotubes to enhance antibacterial properties. Background technique [0002] Separation membrane technology is widely used in industry and has become one of the new chemical unit operations. Among them, ultrafiltration membrane technology has been widely used in the separation, concentration and purification of biological products, pharmaceutical products and food industry products, and can also be used for terminal treatment in blood treatment, wastewater treatment and ultrapure water preparation. In my country, ultrafiltration membranes have been successfully used for the concentration and purification of Chinese herbal medicines, fruit juice concentration, waste water recovery, and pretreatment of pure water preparation. With the development of ultrafiltration membrane t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/02B01D67/00
Inventor 张林赵海洋周志军陈欢林
Owner ZHEJIANG UNIV
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