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PES microfiltration membrane co-modified with Ag and TiO2 through dopamine and preparation method and application thereof

A technology of microfiltration membrane and dopamine, which is applied in the field of PES microfiltration membrane, can solve the problems that Ag nanoparticles cannot be effectively supplemented, insufficient membrane pollution recovery performance, uneven structure and purity, etc., so that it is not easy to de-embed , save the cost of use, and the effect of simple preparation method

Inactive Publication Date: 2018-11-27
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the existing membrane modification technology, such as the Chinese patent document CN201710769750.9 discloses an Ag-TiO 2 The PES ultrafiltration membrane, the ultrafiltration membrane uses tetrabutyl titanate as TiO 2 Precursor, to which silver nitrate is added to obtain Ag-TiO 2 Composite sol, PES ultrafiltration membrane immersed in Ag-TiO 2 In the composite sol, let it stand for a period of time, take out the PES ultrafiltration membrane, and obtain the Ag-TiO loaded on the surface of the membrane after drying. 2 The PES ultrafiltration membrane; the operation method is relatively complicated, and due to the limitation of the temperature tolerance of the polymer film, TiO 2 It cannot be treated at high temperature during the generation process, and the prepared TiO 2 Often the structure and purity are uneven, its photocatalytic efficiency is relatively limited, and the pollution recovery performance of the membrane is insufficient
In addition, since the Ag + Released during the operation of filtration applications, the Ag nanoparticles in the invention cannot be effectively replenished, which limits the anti-fouling ability of the membrane in long-term use

Method used

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  • PES microfiltration membrane co-modified with Ag and TiO2 through dopamine and preparation method and application thereof
  • PES microfiltration membrane co-modified with Ag and TiO2 through dopamine and preparation method and application thereof
  • PES microfiltration membrane co-modified with Ag and TiO2 through dopamine and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of Ag and TiO 2 The preparation method of the PES microfiltration membrane co-modified by dopamine, the steps are as follows:

[0036] (1) Use a 0.22 μm polyethersulfone (PES) microfiltration membrane as the substrate, soak in isopropanol for 30 minutes to remove impurities on the surface of the membrane, and then soak in deionized water for 3-5 times to remove the membrane pore surface and membrane pores The isopropanol adsorbed inside can be used to obtain the basement membrane after cleaning;

[0037] (2) 100mg dopamine hydrochloride is dissolved in 50mL pH and be 8.5, in the Tris-HCl buffer solution of the 10mM of concentration, obtain dopamine hydrochloride solution, the active layer surface of the PES microfiltration membrane after step (1) cleaning is placed in hydrochloric acid In the dopamine solution, shake at a constant temperature of 30°C for 6 hours in the dark, and the oscillation frequency is 50rpm, so that a PDA layer with rich functional groups ...

experiment example 1

[0051] Membrane hydrophilicity and hydrophobicity are an important part of membrane characteristics, and the size of the water contact angle on the membrane surface can intuitively show the size of membrane hydrophilicity and hydrophobicity. Generally speaking, the more hydrophilic the membrane, the smaller its contact angle and the stronger its hydrophilicity. The contact angle was measured by the pendant drop method. After the membrane sample was vacuum-dried at 50°C, 2 μL of water droplets were placed on the membrane, and after standing for 3 seconds, the pictures of the droplets formed on the surface of the membrane were recorded, which were obtained by the angle measurement method. Its contact angle size; the basement membrane that step (1) obtains in embodiment 1, the PES microfiltration membrane that step (2) obtains is loaded with polydopamine (PDA) active layer, the Ag and TiO that step (4) obtains 2 Through the dopamine co-modified PES microfiltration membrane, and t...

experiment example 2

[0053] With the basement membrane that step (1) obtains in embodiment 1, the PES microfiltration membrane that step (2) obtains is loaded with polydopamine (PDA) active layer, the Ag and TiO that step (4) obtains 2 Through the dopamine co-modified PES microfiltration membrane, and the Ag-PDA modified PES microfiltration membrane of Comparative Example 1, the TiO 2 The PES microfiltration membranes co-modified by dopamine were cut into 1×1cm membranes respectively, and the Escherichia coli cultured for 14 hours was used as the model bacteria in the experiment, and the culture medium was removed by centrifugation. about 10 5 After sterilizing the membrane for 30 minutes by UV, paste it on LB solid medium (tryptone of 10g / L, sodium chloride of 10g / L, yeast extract of 5g / L, agar of 15g / L, sterilized by high pressure steam at 121℃ After 20 minutes, pour it into the flat plate) to avoid the impact of the death of the cells on the determination of the membrane antibacterial property...

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Abstract

The invention relates to a PES microfiltration membrane co-modified with Ag and TiO2 through dopamine and a preparation method and an application thereof. The method comprises the following steps: forming a polydopamine intermediate layer on the membrane surface by means of auto-agglutination action of dopamine after PES is cleaned; reducing Ag<+> to Ag anoparticles in situ by means of a o-benzoquinone group of the polydopamine intermediate layer; and then loading TiO2 with high photocatalytic activity to the membrane surface to obtain the PES microfiltration membrane co-modified with Ag and TiO2 through dopamine. By modifying Ag and TiO2 naoparticles to the membrane surface, the PES membrane has anti-pollution ability with a filter process and a light energy self-cleaning ability after pollution. The modified membrane not only has a relatively high water flux, but also can resist membrane pollution effectively. The loss of Ag<+> in the sterilizing process can be generated by means ofsimple secondary soaking. Ag and TiO2 co-doped by polydopamine can enhance the service performance of the membrane effectively.

Description

technical field [0001] The present invention relates to a kind of Ag and TiO 2 A PES microfiltration membrane co-modified by dopamine, a preparation method and application thereof, belong to the field of membrane technology. Background technique [0002] Membrane fouling is one of the main factors restricting the development of membrane technology. At present, there are three main ways to inhibit membrane fouling: (1) Increase the pretreatment process, change the characteristics of pollutants in the influent or reduce the amount of pollutants in the influent. For example, the coagulation pretreatment process is added before the ultrafiltration system to reduce the concentration of pollutants in the water body, thereby reducing membrane fouling. (2) Enhance the resistance of the membrane itself to fouling by modifying the membrane. (3) Establish a reactive membrane system to degrade and remove pollutants on the membrane surface, thereby inhibiting membrane fouling. For exa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/82B01D67/00B01D69/02B01D71/02B01D71/62
CPCB01D67/0079B01D67/0093B01D69/02B01D71/022B01D71/024B01D71/62B01D71/68B01D71/82B01D2325/10B01D2325/30B01D2325/48
Inventor 王允坤任少杰马小芳王曙光
Owner SHANDONG UNIV
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