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Modified polyvinylidene fluoride (PVDF) hollow fibrous membrane and preparation method thereof

A polyvinylidene fluoride and fiber membrane technology, which is applied in chemical instruments and methods, membrane technology, and semi-permeable membrane separation, can solve problems such as dynamic membrane instability, achieve low membrane fouling growth rate, improve hydrophilicity and The effect of anti-pollution ability

Inactive Publication Date: 2011-08-31
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention provides a modified polyvinylidene fluoride (PVDF) hollow fiber membrane and its preparation method in order to solve the above-mentioned problem of dynamic membrane instability

Method used

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  • Modified polyvinylidene fluoride (PVDF) hollow fibrous membrane and preparation method thereof
  • Modified polyvinylidene fluoride (PVDF) hollow fibrous membrane and preparation method thereof
  • Modified polyvinylidene fluoride (PVDF) hollow fibrous membrane and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0036] A method for preparing a modified polyvinylidene fluoride (PVDF) hollow fiber membrane, comprising the steps of:

[0037] (1), PVDF hollow fiber microfiltration membrane pretreatment

[0038] The PVDF hollow fiber microfiltration membrane with a membrane pore size of 0.05 μm is made into an MBR module, and then the membrane module is soaked in deionized water to wash off the glycerin on the surface of the membrane, and it is pre-pressed at a temperature of 20°C and a pressure of 0.1MPa for 1 hour before use. ;

[0039] Figure 1a It is the SEM picture of the surface of the unmodified PVDF hollow fiber microfiltration membrane after pretreatment;

[0040] (2), TiO 2 Dynamically modified membrane preparation

[0041] Place the pretreated hollow fiber microfiltration membrane module in TiO with an average particle size of 50nm and a concentration of 0.1%. 2 Ultrasonic treatment at room temperature for 2 minutes in the water suspension, then standing in the air, after n...

Embodiment 2

[0049] A method for preparing a modified polyvinylidene fluoride (PVDF) hollow fiber membrane, comprising the steps of:

[0050] (1) PVDF hollow fiber microfiltration membrane pretreatment

[0051] The PVDF hollow fiber microfiltration membrane with a membrane pore size of 0.10 μm is made into an MBR module, and the membrane module is soaked in deionized water to wash off the glycerin on the surface of the membrane, and it is pre-pressed at a temperature of 25 ° C and a pressure of 0.05 MPa for 1.5 hours before use. ;

[0052] (2) TiO 2 Dynamically modified membrane preparation

[0053] Put the pretreated hollow fiber microfiltration membrane module in 1.0%TiO 2 (TiO 2 The water suspension of nanoparticles with an average particle size of 100nm) is first subjected to ultrasound for 10 minutes, then left to stand in the air and dried, and then press-filtered. During the press-filtering process, the pressure is controlled at 0.50Mpa and the time is 1.0h to form an irreversib...

Embodiment 3

[0060] A method for preparing a modified polyvinylidene fluoride (PVDF) hollow fiber membrane, comprising the steps of:

[0061] (1), PVDF hollow fiber microfiltration membrane pretreatment

[0062] The PVDF hollow fiber microfiltration membrane with a membrane pore size of 0.2 μm is made into an MBR module, and the membrane module is soaked in deionized water to wash away the glycerol on the surface of the hollow fiber microfiltration membrane, and pre-pressed at a temperature of 30°C and a pressure of 0.5MPa Standby after 1.0h;

[0063] (2) TiO 2 Dynamically modified membrane preparation

[0064] Put the pretreated hollow fiber microfiltration membrane module in 0.8%TiO 2 (TiO 2 Nanoparticles with an average particle size of 200nm) were first subjected to ultrasonication for 15 minutes, then left to stand in the air, and after being dried, the pressure was controlled at 0.20Mpa, and the pressure was filtered for 4 hours to form an irreversible dynamic deposition layer; ...

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Abstract

The invention discloses a modified polyvinylidene fluoride (PVDF) hollow fibrous membrane and a preparation method thereof. The modified PVDF hollow fibrous membrane comprises a PVDF hollow fibrous micro filter membrane and a new dynamic secondary TiO2 nano particles perfillmimg layer on the surface of the filter membrane. The preparation method of the fibrous membrane comprises the steps of preprocessing the PVDF hollow fibrous micro filter membrane and preparing a TiO2 dynamic modified membrane. In the invention, TiO2 nano particles are physically coated on the surface of the PVDF hollow fibrous micro filter membrane to modify a dynamic membrane, so that the hydrophilism and the contamination resistance of the PVDF hollow fibrous micro filter membrane are improved; and the dynamic membrane is used in a membrane bioreactor, and a result shows that the dynamic membrane is lower in the growth ratio of membrane contamination. Furthermore, the preparation method of the modified PVDF hollow fibrous micro filter membrane is simple, effective and practical.

Description

technical field [0001] The invention relates to a modified polyvinylidene fluoride (PVDF) hollow fiber membrane and a preparation method thereof. That is, the use of nanoparticle titanium dioxide (TiO 2 ) coated on the surface of polyvinylidene fluoride (PVDF) hollow fiber membrane to form a new dynamic modified membrane that resists membrane fouling. Background technique [0002] As a new separation technology, membrane technology has attracted more and more attention in the process of sewage treatment and reclaimed water reuse [Xu Zhenliang. Membrane Water Treatment Technology [M]. Beijing: Chemical Industry Press, 2001]. Polyvinylidene fluoride (PVDF) has the advantages of excellent chemical stability, thermal stability, mechanical stability, etc. It is an excellent new polymer membrane material, and has attracted extensive attention in membrane separation technology in recent years. However, the membranes made of it have disadvantages such as strong hydrophobicity, eas...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/08C02F3/00
Inventor 陈桂娥卢琼许振良周颖
Owner SHANGHAI INST OF TECH
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