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Modified polyvinylidene fluoride ultrafiltration membrane and preparation method thereof

A polyvinylidene fluoride and ultrafiltration membrane technology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve problems such as limited water resources, and achieve the effect of long durable life and high superabsorption performance

Active Publication Date: 2020-12-04
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the available water resources in our country are very limited, and industrial wastewater must be purified and reused to make up for the shortcomings of insufficient water resources.

Method used

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  • Modified polyvinylidene fluoride ultrafiltration membrane and preparation method thereof
  • Modified polyvinylidene fluoride ultrafiltration membrane and preparation method thereof
  • Modified polyvinylidene fluoride ultrafiltration membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] An embodiment of the modified polyvinylidene fluoride ultrafiltration membrane of the present invention, the preparation method of the modified polyvinylidene fluoride ultrafiltration membrane described in this embodiment comprises the following steps:

[0033] One, prepare polyvinylidene fluoride ultrafiltration membrane, comprise the following steps:

[0034] (a) PVDF was dissolved in triethyl phosphate at 70° C., and stirred under nitrogen at a mechanical stirring speed of 400 rpm for 10 h to obtain a homogeneous solution;

[0035] (b) Carry out vacuum degassing to the homogeneous solution prepared in step (a), remove the microbubbles therein, obtain casting solution, scrape the casting solution onto the non-woven fabric, and quickly soak it in the coagulation bath V 磷酸三乙酯 :V 水 =5:5, soak for 20s to get primary PVDF ultrafiltration membrane;

[0036] (c) solidifying the primary PVDF ultrafiltration membrane obtained in step (b) in deionized water, and drying to obt...

Embodiment 2

[0042] An embodiment of the modified polyvinylidene fluoride ultrafiltration membrane of the present invention, the preparation method of the modified polyvinylidene fluoride ultrafiltration membrane described in this embodiment comprises the following steps:

[0043] One, prepare polyvinylidene fluoride ultrafiltration membrane, comprise the following steps:

[0044] (a) PVDF was dissolved in triethyl phosphate at 80° C., and stirred under nitrogen at a mechanical stirring speed of 500 rpm for 12 hours to obtain a homogeneous solution;

[0045] (b) Carry out vacuum degassing to the homogeneous solution prepared in step (a), remove the microbubbles therein, obtain casting solution, scrape the casting solution onto the non-woven fabric, and quickly soak it in the coagulation bath V 磷酸三乙酯 :V 水 =5:5, soak for 30s to get primary PVDF ultrafiltration membrane;

[0046] (c) solidifying the primary PVDF ultrafiltration membrane obtained in step (b) in deionized water, and drying to...

Embodiment 3

[0052] An embodiment of the modified polyvinylidene fluoride ultrafiltration membrane of the present invention, the preparation method of the modified polyvinylidene fluoride ultrafiltration membrane described in this embodiment comprises the following steps:

[0053] One, prepare polyvinylidene fluoride ultrafiltration membrane, comprise the following steps:

[0054] (a) PVDF was dissolved in triethyl phosphate at 90° C., and stirred under nitrogen at a mechanical stirring speed of 600 rpm for 14 hours to obtain a homogeneous solution;

[0055] (b) Carry out vacuum degassing to the homogeneous solution prepared in step (a), remove the microbubbles therein, obtain casting solution, scrape the casting solution onto the non-woven fabric, and quickly soak it in the coagulation bath V 磷酸三乙酯 :V 水 =5:5, soak for 40s to get primary PVDF ultrafiltration membrane;

[0056] (c) solidifying the primary PVDF ultrafiltration membrane obtained in step (b) in deionized water, and drying to...

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Abstract

The invention discloses a preparation method of a modified polyvinylidene fluoride ultrafiltration membrane, and relates to the technical field of water treatment. The preparation method of the modified polyvinylidene fluoride ultrafiltration membrane comprises the following steps: (1) reversely putting the polyvinylidene fluoride ultrafiltration membrane into an ultrafiltration device, and pouring uniformly dispersed suction filtrate, wherein the suction filtrate comprises nano ferroferric oxide particles and diluted hydrochloric acid; and (2) applying pressure to the polyvinylidene fluorideultrafiltration membrane, carrying out suction filtration, and after the suction filtration is completed, cleaning unfixed nano ferroferric oxide particles on the surface of the polyvinylidene fluoride ultrafiltration membrane, and airing to obtain the modified polyvinylidene fluoride ultrafiltration membrane. The modified polyvinylidene fluoride ultrafiltration membrane prepared by the method hasgood hydrophilicity, super-adsorption performance and high closure effect, the surface of the membrane has anti-pollution performance, and the service life of the membrane is long.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a modified polyvinylidene fluoride ultrafiltration membrane and a preparation method thereof. Background technique [0002] With the rapid development of economy and society and the rapid development of industrial production, the amount of industrial water and wastewater produced in my country has increased rapidly. However, the available water resources in our country are very limited, and industrial wastewater must be purified and reused to make up for the shortage of water resources. [0003] At present, the domestic sewage treatment industry is booming. Membrane separation technology is a method that uses the membrane as the separation medium, applies a certain propulsion force on both sides of the membrane, and selectively measures the original substance through the membrane, so as to achieve the purpose of separation. With the accumulation of basic theoretical res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/02B01D67/00B01D61/14C02F1/28C02F1/44
CPCB01D71/34B01D69/02B01D67/0013B01D61/145C02F1/285C02F1/444B01D2325/36
Inventor 胡春何子俊熊竹
Owner GUANGZHOU UNIVERSITY
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