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Novel hydrophilic anti-pollution polyvinylidene fluoride flat membrane, and preparation method and application thereof

A technology of polyvinylidene fluoride film and polyvinylidene fluoride, applied in the field of preparation of new hydrophilic anti-pollution polyvinylidene fluoride flat film, can solve the problem of poor antibacterial effect, poor mechanical strength, and unstable MBR reactor To achieve excellent antibacterial effect, improve antibacterial performance, and delay membrane fouling

Inactive Publication Date: 2019-04-02
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Aiming at the problems of poor mechanical strength, poor antibacterial effect, and inability to operate stably in MBR reactors in the prior art, the present invention provides a novel hydrophilic anti-pollution polysegregation film that can operate stably in MBR reactors. Vinyl fluoride flat film

Method used

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  • Novel hydrophilic anti-pollution polyvinylidene fluoride flat membrane, and preparation method and application thereof
  • Novel hydrophilic anti-pollution polyvinylidene fluoride flat membrane, and preparation method and application thereof
  • Novel hydrophilic anti-pollution polyvinylidene fluoride flat membrane, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] The GO / TiO of this embodiment 2 / PVDF flat membrane preparation method, its steps are as follows:

[0052] (1) Preparation of graphene oxide (GO): GO is prepared using the Improved Hummers method. The specific steps are as follows: prepare a mixed acid solution (90% concentrated sulfuric acid and 10% concentrated phosphoric acid), and measure 46.0mL of the mixed acid solution into a three-necked flask medium (500 mL), put the three-necked flask in an ice-water bath, add 2.0 g flake graphite powder, 1.0 g sodium nitrate, stir for 30 min, then stir in a 35°C water bath for 60 min. Then the temperature of the water bath was raised to 60°C, and 98.0 mL of deionized water was continuously added dropwise with a separatory funnel, and then the temperature was adjusted to 98°C, and the stirring reaction was continued for 30 minutes. The reaction mixture was diluted and rinsed with deionized water, then 15mL of 5% hydrogen peroxide and 20mL of 5% HCl were added dropwise until t...

Embodiment 2

[0056] In this embodiment PVDF / GO / TiO 2 Flat membrane preparation method, its implementation steps are basically the same as in Example 1, the difference is: the GO and nano-scale TiO 2 The mass ratio of the casting solution is 1:2; the mass ratio of the components of the casting solution is PVDF: DMAC: GO: TiO 2 =10:80:1:1; the scraping film speed in the step (2) is 3 cm / s; the scraping film thickness is 200 μm. The flat film obtained in this example is GO / TiO 2 (1.0 / 2.0 wt%) / PVDF.

Embodiment 3

[0058] In this embodiment PVDF / GO / TiO 2 Flat membrane preparation method, its implementation steps are basically the same as in Example 1, the difference is: the GO and nano-scale TiO 2 The mass ratio of the casting solution is 1:3; the mass ratio of each component of the casting solution is PVDF:DMAC:GO:TiO 2 =15:84:1:3; the scraping film speed in the step (2) is 6 cm / s; the scraping film thickness is 250 μm. The flat film obtained in this example is GO / TiO 2 (1.0 / 3.0 wt%) / PVDF.

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Abstract

The invention discloses a novel hydrophilic anti-pollution polyvinylidene fluoride flat membrane, and a preparation method and application thereof, and belongs to the fields of water treatment and environmental functional materials. A matrix of the flat membrane comprises nano titanium dioxide and graphene oxide, and the mass ratio of the graphene oxide to the nano titanium dioxide is 1:(1-5). Thepreparation method of the flat membrane comprises the following steps: 1) preparing a membrane casting solution, concretely adding graphene oxide powder and nano silicon dioxide into a dimethylacetamide solvent, carrying out ultrasonic dispersion to obtain a dispersion liquid, then adding polyvinylidene fluoride and a pore-foaming agent polyvinylpyrrolidone into the dispersion liquid, and carrying out heating and stirring for a reaction to prepare the membrane casting solution; and 2) preparing a finished product film. Filtration performance, hydrophilicity, mechanical strength and bacteriostasis performance of the flat membrane provided by the invnetion are excellent, the microbial population structure in a membrane bioreactor (MBR) cannot be influenced, growth of microorganisms cannot be inhibited, and popularization is facilitated.

Description

technical field [0001] The invention belongs to the field of water treatment and environmental functional materials, and more specifically relates to a novel hydrophilic anti-pollution polyvinylidene fluoride flat film, a preparation method and application. Background technique [0002] Membrane bioreactor (MBR) technology has the advantages of high volume load, good effluent quality, small footprint, and less sludge generation. It is widely used in the advanced treatment and reuse of urban domestic sewage and industrial wastewater. However, in the actual application process, microorganisms and their extracellular polymers (Extracellular Polymeric Substances, EPS), soluble microbial products (soluble microbial products, SMP), suspended particles in water and other pollutants in the membrane bioreactor will adsorb , Deposited on the surface of the membrane, causing membrane pore blockage and forming a mud cake layer, leading to a decrease in membrane flux, which is the so-cal...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D69/06B01D71/34B01D67/00C02F3/34
CPCB01D67/0079B01D69/02B01D69/06B01D71/34C02F3/34C02F2203/006B01D2325/24B01D2325/48B01D2325/36
Inventor 王津南林耀华周嘉丽
Owner NANJING UNIV
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