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Modified ultrafiltration membrane capable of jointly inhibiting membrane biological pollution as well as preparation method and application thereof

A technology of combined suppression and ultrafiltration membrane, applied in the field of composite ultrafiltration membrane, can solve the problem of not reducing water flux, and achieve the effect of improving water flux, maintaining modification effect, and stabilizing modification effect.

Active Publication Date: 2021-03-02
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to overcome the antibacterial and algae inhibiting properties of the existing modified ultrafiltration membranes, and at the same time ensure that the water flux is not reduced, and provide a method for preparing a modified ultrafiltration membrane that combines inhibition of membrane biofouling. A modified ultrafiltration membrane with high stability, excellent antibacterial and anti-algae performance and the ability to ensure that the water flux will not be reduced is prepared by compounding specific modified agents

Method used

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  • Modified ultrafiltration membrane capable of jointly inhibiting membrane biological pollution as well as preparation method and application thereof
  • Modified ultrafiltration membrane capable of jointly inhibiting membrane biological pollution as well as preparation method and application thereof
  • Modified ultrafiltration membrane capable of jointly inhibiting membrane biological pollution as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A preparation method of a tannic acid-copper combined inhibition membrane biofouling modified ultrafiltration membrane, specifically comprising the following steps:

[0042] S1. Take out a clean blank PVDF ultrafiltration membrane (9cm in diameter), immerse it in a 500mL beaker filled with distilled water, soak for 30min, and fix the soaked blank PVDF ultrafiltration membrane on a custom modified container to make it The modified side (smooth side) faces up;

[0043]S2. take by weighing 170.12mg tannic acid and dissolve in 10mL deionized water, take by weighing 6.25mg pentahydrate·copper sulfate and dissolve in 10mL deionized water, tannic acid solution and copper sulfate solution are poured in the modification container successively, every When pouring a solution, it needs to be shaken for 30 seconds to make the modifier mix evenly;

[0044] S3. Wrap the modified container completely with aluminum paper to keep it in a dark state, fix the modified container on a water...

Embodiment 2

[0047] A method for preparing a modified ultrafiltration membrane combined with inhibiting membrane biofouling, specifically comprising the following steps:

[0048] S1. Take out a clean blank PVDF ultrafiltration membrane (9cm in diameter), immerse it in a 500mL beaker filled with distilled water, soak for 30min, and fix the soaked blank PVDF ultrafiltration membrane on a custom modified container to make it The modified side (smooth side) faces up;

[0049] S2. take by weighing 170.12mg tannic acid and dissolve in 10mL deionized water, take by weighing 12.50mg pentahydrate·copper sulfate and dissolve in 10mL deionized water, pour tannic acid solution and copper sulfate solution in the modified container successively, every When pouring a solution, it needs to be shaken for 30 seconds to make the modifier mix evenly;

[0050] S3. Wrap the modified container completely with aluminum paper to keep it in a dark state, fix the modified container on a water bath oscillator, and m...

Embodiment 3

[0053] A method for preparing a modified ultrafiltration membrane combined with inhibiting membrane biofouling, specifically comprising the following steps:

[0054] S1. Take out a clean blank PVDF ultrafiltration membrane (9cm in diameter), immerse it in a 500mL beaker filled with distilled water, soak for 30min, and fix the soaked blank PVDF ultrafiltration membrane on a custom modified container to make it The modified side (smooth side) faces up;

[0055] S2. take by weighing 170.12mg tannic acid and dissolve in 10mL deionized water, take by weighing 25.00mg pentahydrate·copper sulfate and dissolve in 10mL deionized water, pour tannic acid solution and copper sulfate solution in the modification container successively, every When pouring a solution, it needs to be shaken for 30 seconds to make the modifier mix evenly;

[0056] S3. Wrap the modified container completely with aluminum paper to keep it in a dark state, fix the modified container on a water bath oscillator, a...

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Abstract

The invention discloses a modified ultrafiltration membrane capable of jointly inhibiting membrane biological pollution as well as a preparation method and an application of the modified ultrafiltration membrane. The preparation method of the modified ultrafiltration membrane capable of jointly inhibiting membrane biological pollution comprises the following steps: S1, preparing a modifying agent;S2, placing the polymer ultrafiltration membrane substrate in a modifying agent solution, and performing surface modification in a dark state; and S3, cleaning to obtain the tannic acid copper-iron surface modified polymer ultrafiltration membrane. The tannic acid copper-iron modified ultrafiltration membrane prepared by the preparation method disclosed by the invention has the advantages that firstly, the tannic acid copper-iron modified ultrafiltration membrane has extremely high biological pollution resistance, and by taking escherichia coli, bacillus subtilis and microcystis aeruginosa asexamples, the sterilization rate is 99.99 percent, the sterilization rate is 98.45 percent, and the algae inhibition rate is 98.43 percent; secondly, the water flux is not reduced, and the water fluxof the modified membrane is increased by 0.52% compared with that before modification; and thirdly, the stability is high, and the stability of copper ions is 84.50%.

Description

technical field [0001] The invention relates to the field of composite ultrafiltration membranes, and more specifically relates to a modified ultrafiltration membrane combined with inhibiting membrane biofouling and its preparation method and application. Background technique [0002] Ultrafiltration technology can effectively remove pathogenic bacteria, turbidity, organic matter and disinfection by-products in water, but membrane fouling is inevitable during the application process. Microorganisms adsorb on the surface of the membrane and use the biodegradable substances intercepted on the surface of the membrane to grow and reproduce, resulting in biofouling of the membrane. At the same time, the acidic substances discharged by microorganisms can lead to the biodegradation of the membrane, especially the degradation of cellulose acetate, resulting in the destruction of the membrane structure. In addition, in the process of treating algae-containing water or high-algae wat...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D67/00C02F1/44
CPCB01D69/02B01D67/0002C02F1/444B01D2325/48Y02W10/10
Inventor 杨恩诺柳君侠王志红邹康兵
Owner GUANGDONG UNIV OF TECH
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