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Preparation method of modified ultrafiltration membrane co-coated by utilizing dopamine and functional CNTs (Carbon Nanotubes)

A technology of carbon nanotubes and ultrafiltration membranes, applied in chemical instruments and methods, ultrafiltration, membranes, etc., can solve the problems of increased membrane resistance, poor antibacterial performance, and low flux, so as to prolong service life and improve flux , the effect of reducing pollution

Active Publication Date: 2018-11-23
HAINAN LITREE PURIFYING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Compared with organic polymer coatings, organic polymer coatings are generally used for surface coating modification, and there are some problems in polymer coatings. Nanomaterials are different from polymer organic materials. The present invention adopts hydrophilic Nanomaterial coating can solve the existing problems. The present invention can provide water passage through hydrophilic nanomaterials, and has greater freedom in membrane performance regulation; at the same time, nanomaterial surface coating can maximize carbon The adsorption and antibacterial properties of nanotubes greatly reduce ultrafiltration membrane fouling, thereby improving the flux of the membrane in long-term operation
[0006] The invention aims to solve the technical problems of membrane fouling and low flux existing in the operation of the ultrafiltration membrane, aiming at the poor antibacterial performance of the membrane in the existing carbon nanotube blend modification, the significant increase of the membrane resistance by the coating of the polymer organic layer and the single The shedding problem of carbon nanotubes in the preparation method of carbon nanotubes coating modified ultrafiltration membrane, providing a kind of Fe 2+ / Persulfate quickly catalyzes the polymerization of dopamine, realizes the co-coating of dopamine and functionalized carbon nanotubes on the modified ultrafiltration membrane, effectively improves the problem of shedding when the surface is coated with carbon nanotubes, and strengthens the anti-pollution and antibacterial properties of the membrane can

Method used

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  • Preparation method of modified ultrafiltration membrane co-coated by utilizing dopamine and functional CNTs (Carbon Nanotubes)
  • Preparation method of modified ultrafiltration membrane co-coated by utilizing dopamine and functional CNTs (Carbon Nanotubes)
  • Preparation method of modified ultrafiltration membrane co-coated by utilizing dopamine and functional CNTs (Carbon Nanotubes)

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Embodiment 1

[0033] Embodiment 1. In this embodiment, the preparation method of the modified ultrafiltration membrane co-coated with dopamine and functionalized carbon nanotubes is carried out according to the following steps:

[0034] Step 1. Put 12g polysulfone, 4g PEG200 and 84g N,N-dimethylformamide into a 250mL Erlenmeyer flask. Seal the mouth of the flask with plastic wrap. Place the Erlenmeyer flask on a magnetic heating stirrer at 60℃. , Magnetic stirring for 8h at 400r / min, and degassing at room temperature for 24h to form a homogeneous casting solution;

[0035] Step 2. Stick a PET non-woven fabric with a thickness of 40 μm on a smooth glass plate with adhesive tape, adjust the height of the doctor blade to 80 μm, and use the doctor blade to evenly coat the casting liquid formed in step 1 on the non-woven fabric. Stay at room temperature for 1 min, then place the entire glass plate in N-methylpyrrolidone deionized water with a concentration of 3wt% at 25°C to complete the gel process;...

Embodiment 2

[0040] Embodiment 2. In this embodiment, the preparation method of co-coating modified ultrafiltration membrane with dopamine and functionalized carbon nanotubes is carried out according to the following steps:

[0041] Step 1. Add 12g polyethersulfone, 4g PVPk30 and 84g N-methylpyrrolidone into a 250mL Erlenmeyer flask, seal the mouth of the flask with plastic wrap, and place the Erlenmeyer flask on a magnetic heating stirrer at 60°C, 400r / Magnetic stirring for 8 hours under the condition of min, and degassing at room temperature for 24 hours to form a homogeneous casting solution;

[0042] Step 2. Stick a PET non-woven fabric with a thickness of 80 μm on a smooth glass plate with adhesive tape, adjust the height of the doctor blade to 120 μm, and use a doctor blade to uniformly coat the casting liquid formed in step 1 on the non-woven fabric. Stay at room temperature for 1 min, then place the entire glass plate in N-methylpyrrolidone deionized water with a concentration of 3wt% ...

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Abstract

The invention discloses a preparation method of a modified ultrafiltration membrane co-coated by utilizing dopamine and functional CNTs (Carbon Nanotubes), belongs to the field of preparation of membrane materials and aims to solve the problems of membrane pollution, low flux and the like existing in ultrafiltration membrane running. The preparation method comprises the following steps: firstly adding an additive and a polymeric membrane material into an organic solvent, heating and uniformly stirring, and carrying out vacuum defoamation, thus obtaining a membrane casting solution; uniformly scraping the membrane casting solution to non-woven cloth, and entering a coagulation bath, thus obtaining an ultrafiltration membrane; carboxylating CNTs, ultrasonically dispersing the CNTs in deionized water, and coating the surface of the ultrafiltration membrane with a dispersion solution by utilizing a vacuum filtration way; then promoting dopamine polymerization by utilizing a Fe<2+> / persulfate oxidation system, and firmly fixing the modified CNTs to the surface of the ultrafiltration membrane, thus realizing preparation of the modified ultrafiltration membrane co-coated by the dopamine and modified CNTs. According to the preparation method disclosed by the invention, the adsorptivity, the hydrophily and the antibacterial performance of the CNTs are well utilized, and the anti-pollution property of the ultrafiltration membrane is greatly increased.

Description

Technical field [0001] The invention belongs to the field of membrane material preparation; in particular, it relates to a preparation method for co-coating modified ultrafiltration membranes with dopamine and functionalized carbon nanotubes. Background technique [0002] With the intensification of drinking water source pollution and increasingly strict drinking water indicators, traditional water treatment processes can no longer cope with the increasingly prominent water pollution problems. The upgrading and transformation of traditional water plants has become one of the reform directions of drinking water treatment processes. Ultrafiltration technology can effectively trap particles, colloids, macromolecular organic pollutants and microorganisms in the water body. Therefore, it has become a research hotspot in the field of drinking water treatment and has been successfully applied in large-scale water plants. In the actual operation process, some problems of ultrafiltration ...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D69/02B01D67/00B01D61/14
CPCB01D61/145B01D67/0079B01D69/02B01D71/68B01D2325/48
Inventor 梁恒白朗明朱学武李圭白陈忱陈清陈良刚
Owner HAINAN LITREE PURIFYING TECH CO LTD
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