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Modification method of PVDF filter membrane, the modified PVDF filter membrane, and application thereof

A modified and membrane-filtering technology, applied in the field of water treatment, to achieve the effects of good anti-pollution performance, small flux decay rate, and simple operation

Inactive Publication Date: 2018-12-04
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are certain limitations in practical applications, so it is of great research significance to seek a simple and effective method for amphoteric ionization modification of the membrane surface.

Method used

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  • Modification method of PVDF filter membrane, the modified PVDF filter membrane, and application thereof
  • Modification method of PVDF filter membrane, the modified PVDF filter membrane, and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The PVDF filter membrane was ultrasonically cleaned with absolute ethanol and deionized water for 10 minutes, and dried at 25°C for 24 hours to remove the chemical substances on the surface of the PVDF filter membrane;

[0038] Treat the PVDF filter membrane under 15W plasma conditions for 90s to activate the surface of the PVDF filter membrane;

[0039] The DMAA is passed into the vacuum chamber in a gaseous state through a bubbler, and the plasma-induced gaseous DMAA is grafted on the surface of the PVDF filter membrane under 15W plasma conditions, and the reaction is 90s to obtain a PVDF-g-PDMAA membrane;

[0040] The grafted polymer PDMAA on the PVDF-g-PDMAA membrane and 30% 4-bromobutyric acid were quaternized at 55°C for 12 hours to generate a zwitterionic polymer, and a zwitterionic modified PVDF filter membrane was obtained;

[0041] The amphoteric ionization modified PVDF filter membrane was ultrasonically cleaned with absolute ethanol and deionized water for 3...

Embodiment 2

[0043] The difference from Example 1 is that after the activation of the PVDF filter membrane treated under the 20W plasma condition, the plasma-induced gaseous DMAA is grafted on the surface of the PVDF filter membrane under the 20W plasma condition for 60 s.

Embodiment 3

[0045] The difference from Example 1 is that after the activation of the PVDF filter membrane treated under the 10W plasma condition, the plasma-induced gaseous DMAA is grafted on the surface of the PVDF filter membrane under the 10W plasma condition for 120 s.

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Abstract

The invention provides a modification method of a PVDF filter membrane, the modified PVDF filter membrane, and an application thereof, and belongs to the technical field of water treatment. The method, capable of solving the technical problems of poor hydrophilicity and antifouling effect of the PVDF filter membranes in the prior art, includes: processing the PVDF filter membrane in a short time under the condition of low-power plasma to activate the surface of the PVDF filter membrane; in gas state, feeding DMAA (dimethylallylamine) into a vacuum chamber, so that a grafting reaction between the gas-state DMAA and the surface of the PVDF filter membrane is initiated by plasma, thus forming plasma-modified membrane PVDF-g-PDMAA; and performing a quaterisation reaction to the grafted polymerPDMAA on the PVDF-g-PDMAA membrane and 4-bromobutyric acid to generate a zwitterionic polymer, thus obtaining zwitterionically modified PVDF filter membrane. The product is applied to the field of water pollution control.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for modifying a PVDF filter membrane, the obtained modified PVDF filter membrane and an application thereof. Background technique [0002] Membrane bioreactor is a new water treatment process with the most development potential and application prospect developed at the end of the 20th century. Among them, the filter membrane module is the main component of the membrane bioreactor, and the hydrophilicity, hydrophobicity and mechanical strength of the filter membrane affect the membrane fouling status and thus affect its application. Commonly used membrane materials are organic membranes, such as polyethylene (PE), polypropylene (PP), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polysulfone (PS) and the like. According to the principle of similar miscibility, general organic membranes have the characteristics of non-polarity or weak ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/78C02F3/10
CPCB01D67/0006B01D69/02B01D71/78B01D2323/38B01D2325/36C02F3/102Y02W10/10
Inventor 李之鹏尤宏柳锋贾玉红
Owner HARBIN INST OF TECH AT WEIHAI
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