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Multiwalled carbon nanotube hybrid ultrafiltration membrane with anti-pollution, self-cleaning and antibacterial properties

A technology of multi-wall carbon nanotubes and ultrafiltration membranes, applied in the field of membrane separation, can solve the problems of not being able to directly obtain dry powder preparations, and achieve good application prospects, pollution-free operation, and low energy consumption.

Inactive Publication Date: 2017-12-05
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

5. The ultrafiltration method also has certain limitations, it cannot directly obtain dry powder preparations

Method used

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  • Multiwalled carbon nanotube hybrid ultrafiltration membrane with anti-pollution, self-cleaning and antibacterial properties
  • Multiwalled carbon nanotube hybrid ultrafiltration membrane with anti-pollution, self-cleaning and antibacterial properties
  • Multiwalled carbon nanotube hybrid ultrafiltration membrane with anti-pollution, self-cleaning and antibacterial properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0032] Disperse 5 grams of MWNTs in a 0.5 mol / L dilute hydrochloric acid solution, sonicate for 10-30 minutes, let stand for 12 hours, vacuum filter, wash until neutral, and dry to obtain purified MWNTs. Put 1 gram of purified MWNTs into an activation kettle, add 10 ml of concentrated nitric acid, heat at 160°C for 6 hours, vacuum filter, wash until neutral, and dry to obtain O-MWNTs. Mix 0.05 moles of 5,5-dimethylhydantoin, 0.05 moles of NaOH, and 40 ml of water and stir at room temperature for 5 to 10 minutes, then add 0.05 moles of epichlorohydrin and stir at room temperature for 10 hours, remove the solvent water by rotary evaporation, and add acetone for purification. The by-product NaCl was removed by filtration, and the acetone was removed by rotary evaporation to obtain the crude product 3-epoxypropyl-5,5-dimethylhydantoin. 10% aqueous solution of 3-epoxypropyl-5,5-dimethylhydantoin, 1% NaOH, 10% O-MWNTs, stirring at 60°C for 30 minutes, curing at 60°C for 1 hour, curi...

Embodiment 5～8

[0038] The PVDF composite ultrafiltration membranes of Examples 1 to 4 are used as membrane modules in a cross-flow filtration device. After the pure water is pre-pressurized, the bovine serum albumin (BSA) (Mw=67000) solution is filtered until the flux is stable and a certain amount of filtrate is collected. Wash with pure water at low pressure for 30 minutes, measure the pure water flux of the membrane again, and study the interception performance and self-cleaning performance. The calculated flux recovery rate and protein retention rate are shown in Table 2.

[0039] Table 2: Flux recovery rate of PVDF composite ultrafiltration membrane

[0040]

Embodiment 1

[0042] The PVDF composite ultrafiltration membranes of Examples 1-4 were used as antibacterial materials, and their antibacterial effects on Escherichia coli and Staphylococcus aureus were investigated by plate coating method. The calculated antibacterial rate is shown in Table 3. Embodiment 1 and embodiment 4 are to Escherichia coli and Staphylococcus aureus antibacterial effect figure see figure 2 .

[0043] Table 3: Antibacterial rate of PVDF composite ultrafiltration membrane against Escherichia coli and Staphylococcus aureus

[0044]

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Abstract

The invention discloses a preparation method of a multiwalled carbon nanotube hybrid ultrafiltration membrane with anti-pollution, self-cleaning and antibacterial properties. A modified multiwalled carbon nanotube (MWNTs) hybrid modified polyvinylidene fluoride (PVDF) ultrafiltration membrane is prepared mainly through a non-solvent induced phase separation (NIPS) method. Preparation materials mainly comprise polyvinylidene fluoride, polyvinylpyrrolidone (PVP) and functional multiwalled carbon nanotubes; a solvent is 1-methyl-2-pyrrolidones (NMP); and coagulating bath is deionized water. The prepared composite flat ultrafiltration membrane has anti-pollution, self-cleaning and antibacterial properties. The influence of addition of O-MWNTs, N-MWNTs and Si-N-MWNTs on polymer membrane morphology, roughness, hydrophilicity, permeability, anti-pollution property and antibacterial property is investigated. The ultrafiltration membrane of the invention has advantages of low energy consumption, no pollution, simple operation and the like.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a multi-walled carbon nanotube hybrid ultrafiltration membrane with self-cleaning and antibacterial properties. Background technique [0002] Ultrafiltration membrane is a filter membrane with a rated pore size below 0.01 micron, which is widely used in water treatment projects and plays an increasingly important role in reverse osmosis pretreatment, drinking water treatment, reclaimed water reuse and other fields. Compared with traditional separation methods, ultrafiltration technology has the following characteristics: 1. It is carried out at room temperature, with mild conditions and no component damage, and is suitable for the separation, fractionation, concentration and enrichment of heat-sensitive substances, such as drugs, enzymes, fruit juices, etc. . 2. There is no phase change, no heating, low energy consumption, no need to add chemical reagents, and no pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/02B01D69/12B01D67/00B01D61/14C02F1/44
Inventor 郎万中黄袁炜崔慧敏谷一航程鹏左继浩张雨奇
Owner SHANGHAI NORMAL UNIVERSITY
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