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Antipollution self-cleaning GO/ZnO-PVDF film and preparation method thereof

A self-cleaning and anti-pollution technology, applied in the field of membrane separation, can solve the problems of porous membrane without self-cleaning ability, membrane without self-cleaning ability, film without self-cleaning ability, etc., to improve self-cleaning performance, good photocatalytic self-cleaning Ability, the effect of structural stability

Active Publication Date: 2018-11-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This characteristic is of great significance for the preparation of membranes with good oil-water separation performance, but there are basically no cases in China that use this characteristic of ZnO to prepare self-cleaning membranes that resist oil pollution.
[0006] CN102814124A provides the method and application of metal hydroxide nanowires and graphene oxide to prepare graphene oxide-based porous films. The method also adopts the method of vacuum suction to filter the mixed suspension of graphene oxide and metal hydroxide nanowires Fixed on polycarbonate porous membrane, but the porous membrane prepared by this invention has no self-cleaning ability
[0007] CN106563362A provides a kind of preparation method and application of low oxidation degree graphene-zinc oxide nanocomposite film, this method needs to prepare the graphene of low oxidation degree, and preparation method is more complicated, and it is to process dye waste water, to water flux The requirements are not high, and the prepared membrane has no self-cleaning ability
This preparation method uses clay minerals, the cost is low, but it needs to scrape the film by itself, the operation is complicated, and the prepared film has no self-cleaning ability

Method used

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  • Antipollution self-cleaning GO/ZnO-PVDF film and preparation method thereof
  • Antipollution self-cleaning GO/ZnO-PVDF film and preparation method thereof
  • Antipollution self-cleaning GO/ZnO-PVDF film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Both the GO solid powder and the ZnO nanowires were dried at 40° C. for 12 hours before use. The ZnO nanowires selected in this example had a diameter of 30-50 nm and a length of 200-400 nm. according to figure 1 In the schematic diagram of the process shown, 20 μg of GO nanosheet solid powder was added to 50 mL of deionized water, and treated in an ultrasonic machine for half an hour to form a uniform graphene oxide dispersion solution. Then, according to the ratio of GO:ZnO=1:6, the nanomaterials were respectively added to the graphene oxide dispersion, and then ultrasonically treated for half an hour, so that the nanomaterials were completely dispersed and evenly mixed with the GO nanosheets. Using a vacuum filtration device, the PVDF filter membrane with a membrane pore size of 0.05-0.07 μm and a hydrophilic angle of 83.2° is used as the base membrane layer, and the solution is suction-filtered on the membrane, and the filtered membrane is placed in a vacuum oven at...

Embodiment 2

[0044] Both the GO solid powder and the nano solid powder were dried at 40°C for 12 hours before use. The ZnO nanowires selected in this example had a diameter of 150-200 nm and a length of 800-1000 nm. Add 10 μg of GO nanosheet solid powder into 50 mL of deionized water, and process it in an ultrasonic machine for half an hour to form a uniform graphene oxide dispersion solution. Then, according to the ratio of GO:ZnO=1:15, the nanomaterials were respectively added to the graphene oxide dispersion, and then ultrasonically treated for half an hour, so that the nanomaterials were completely dispersed and evenly mixed with the GO nanosheets. Using a vacuum filtration device, the PVDF filter membrane with a membrane pore size of 0.12-0.15 μm and a hydrophilic angle of 43° is used as the base membrane layer, and the solution is suction-filtered on the membrane, and the filtered membrane is placed in a vacuum drying oven at 40°C 24h for subsequent analysis and testing. After testi...

Embodiment 3

[0046] Both the GO solid powder and the nano solid powder were dried at 40° C. for 12 hours before use. The ZnO nanowires selected in this example had a diameter of 10-20 nm and a length of 10-50 nm. Add 40 μg of GO nanosheet solid powder into 50 mL of deionized water, and process it in an ultrasonic machine for half an hour to form a uniform graphene oxide dispersion solution. Then, according to the ratio of GO:ZnO=1:3, the nanomaterials were respectively added to the graphene oxide dispersion, and then ultrasonically treated for half an hour, so that the nanomaterials were completely dispersed and evenly mixed with the GO nanosheets. Using a vacuum filtration device, the PVDF filter membrane with a membrane pore size of 0.43-0.5 μm and a hydrophilic angle of 61.5° is used as the base membrane layer, and the solution is suction-filtered on the membrane, and the filtered membrane is placed in a vacuum oven at 40°C 24h for subsequent analysis and testing. The GO / ZnO-PVDF film ...

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Abstract

The invention discloses a preparation method of an antipollution self-cleaning GO / ZnO-PVDF film. The method comprises the following steps: adding graphene oxide nanosheet layer solid powder into deionized water, ultrasonically dispersing to form a homogenous graphene oxide dispersion solution; adding zinc oxide nanowire into the graphene oxide dispersion solution, performing ultrasonic treatment,so that the nano material is completely dispersed and uniformly mixed with the GO nanosheet layer; and suction filtering the nano material suspension onto a diaphragm by utilizing a vacuum suction filtering apparatus and adopting a PVDF filter film as a substrate film layer, and vacuum drying, thus obtaining the GO / ZnO-PVDF film. The prepared GO / ZnO-PVDF film has efficient self-cleaning performance, can rapidly degrade surface oily pollutants under the illumination of the ultraviolet rays, and is simple in operation and easy in industrialized production.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a preparation method of a self-cleaning PVDF membrane. Background technique [0002] In recent years, it has been reported in the literature that metal oxide nanomaterials have extremely strong photochemical properties, and their photocatalytic properties can be used for the degradation of organic matter. Under the stimulation of ultraviolet light, electrons in the valence band of nanomaterials absorb enough light energy to be excited to the conduction band, thereby generating hole-electron pairs. Positively charged hole electrons and freely moving electrons generated by light excitation react with oxygen in air or water respectively to generate highly oxidizing active oxygen. Under the oxidation of active oxygen, the molecular structure of organic matter is destroyed and thus degraded. [0003] Zhang et al. successfully prepared superhydrophobic / superlipophilic pol...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02B01D69/10B01D67/00B01D65/02B01D61/38C02F1/40C02F1/44C08J7/06C08L27/16
CPCB01D61/38B01D65/02B01D67/0079B01D69/02B01D69/10B01D71/34B01D2321/343B01D2325/24C02F1/40C02F1/44C08J7/06C08J2327/16
Inventor 王巧英顾景景章畅李艳丽蒋玲燕裘湛姚杰王志伟吴志超
Owner TONGJI UNIV
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