Conductive Cu/PDA/PVDF composite ultrafiltration membrane and preparation method thereof

An ultrafiltration membrane, self-polymerization technology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., to achieve the effect of low Cu loss rate, good hydrophilicity, and excellent anti-pollution performance

Active Publication Date: 2018-07-31
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the formation of functionalized CuNPs layer by in situ electroless plating

Method used

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  • Conductive Cu/PDA/PVDF composite ultrafiltration membrane and preparation method thereof
  • Conductive Cu/PDA/PVDF composite ultrafiltration membrane and preparation method thereof
  • Conductive Cu/PDA/PVDF composite ultrafiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A preparation method of conductive Cu / PDA / PVDF composite ultrafiltration membrane, the preparation method includes the following steps:

[0045] S1: Cleaning the PVDF ultrafiltration membrane; the cleaning is first cleaning with deionized water and ultrasonic cleaning in ethanol;

[0046] S2: The PVDF ultrafiltration membrane is modified by dopamine (PDA), specifically, the cleaned PVDF ultrafiltration membrane is immersed in a dopamine (PDA) solution and tris-HCl buffer solution In the container, the container is then placed in a shaking water bath to make dopamine self-polymerize on the surface of the ultrafiltration membrane; wherein the concentration of dopamine is 2.0 mg / mL, the pH value is 8.5, and the tris The concentration of HCl) buffer is 50 mM; the self-polymerization time in a shaking water bath is 24 hours.

[0047] S3: cleaning the PVDF ultrafiltration membrane modified in step S2, and the cleaning is 12 hours with deionized water and ethanol to obtain a PDA / PVD...

Embodiment 2

[0052] A preparation method of conductive Cu / PDA / PVDF composite ultrafiltration membrane, the preparation method includes the following steps:

[0053] S1: Cleaning the PVDF ultrafiltration membrane; the cleaning is first cleaning with deionized water and ultrasonic cleaning in ethanol;

[0054] S2: The PVDF ultrafiltration membrane is modified by dopamine (PDA), specifically, the cleaned PVDF ultrafiltration membrane is immersed in a dopamine (PDA) solution and tris-HCl buffer solution In the container, the container is then placed in a shaking water bath to make dopamine self-polymerize on the surface of the ultrafiltration membrane; wherein the concentration of dopamine is 2.0 mg / mL, the pH value is 8.5, and the tris -HCl) The concentration of the buffer is 50mM; the self-polymerization time in the shaking water bath is 24 hours;

[0055] S3: cleaning the PVDF ultrafiltration membrane modified in step S2, and the cleaning is 12 hours with deionized water and ethanol to obtain a P...

Embodiment 3

[0060] A preparation method of conductive Cu / PDA / PVDF composite ultrafiltration membrane, the preparation method includes the following steps:

[0061] S1: Cleaning the PVDF ultrafiltration membrane; the cleaning is first cleaning with deionized water and ultrasonic cleaning in ethanol;

[0062] S2: The PVDF ultrafiltration membrane is modified by dopamine (PDA), specifically, the cleaned PVDF ultrafiltration membrane is immersed in a dopamine (PDA) solution and tris-HCl buffer solution In the container, the container is then placed in a shaking water bath to make dopamine self-polymerize on the surface of the ultrafiltration membrane; wherein the concentration of dopamine is 2.0 mg / mL, the pH value is 8.5, and the tris -HCl) The concentration of the buffer is 50mM; the self-polymerization time in the shaking water bath is 24 hours;

[0063] S3: cleaning the PVDF ultrafiltration membrane modified in step S2, and the cleaning is 12 hours with deionized water and ethanol to obtain a P...

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Abstract

The invention relates to a conductive Cu/PDA/PVDF composite ultrafiltration membrane and a preparation method thereof. The preparation method comprises the following steps: a PVDF ultrafiltration membrane is subjected to PDA modification treatment by use of Tris-HCl as a buffer solution; immersing the modified PDA/PVDF composite ultrafiltration membrane in a silver nitrate solution for catalytic activation treatment; and then placing the modified PDA/PVDF composite ultrafiltration membrane in a plating solution containing 4 mM-12 mM CuCl2, 45-55 mM disodium edetate (EDTA.2Na), 0.08 to 0.12 M boric acid and 0.08 to 0.12 M dimethylamino borane (DMAB) for electroless plating. The conductive Cu/PDA/PVDF composite ultrafiltration membrane has good hydrophilicity, negative charge density, bovineserum albumin (BSA) rejection rate, antibacterial property, electrical conductivity, and excellent anti-pollution performance when an external electric field is applied.

Description

Technical field [0001] The invention belongs to the technical field of separation membrane filtration, and particularly relates to a copper-loaded polyvinylidene fluoride composite separation membrane and a preparation method thereof. Background technique [0002] Membrane fouling, especially irreversible membrane fouling, will reduce separation performance, shorten the service life of the membrane and increase its operating cost. Therefore, membrane fouling is one of the main factors hindering the development of separation membrane technology. Due to its excellent mechanical strength, chemical resistance and thermal stability, polyvinylidene fluoride (PVDF) has become one of the most common and promising materials for the preparation of ultrafiltration membranes for industrial applications. However, prior art studies have shown that the hydrophobicity between the dirt and the PVDF ultrafiltration membrane is the main cause of irreversible membrane fouling. Therefore, for the p...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D61/14B01D67/00
CPCB01D65/02B01D67/00B01D67/0081B01D67/0093B01D67/0097B01D69/12B01D69/125B01D2325/26
Inventor 林红军李仁杰申利国洪华嫦
Owner ZHEJIANG NORMAL UNIVERSITY
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