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Super-hydrophilic self-cleaning oil-water separation membrane as well as preparation method and application thereof

An oil-water separation membrane and oil-water separation technology, applied in the field of polymer materials and environmental engineering, can solve the problems of low efficiency of oil/water emulsion, negative impact on the ecosystem, cumbersome operation, etc., achieve excellent self-cleaning and anti-fouling performance, fast and effective Effect of separation and low energy consumption

Active Publication Date: 2019-06-07
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While these methods are useful, there are many limitations: (1) only able to handle viscous oily water or immiscible oil / water mixtures, with low efficiency for oil / water emulsions; (2) cumbersome to operate and ecologically The system has a large negative impact

Method used

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  • Super-hydrophilic self-cleaning oil-water separation membrane as well as preparation method and application thereof
  • Super-hydrophilic self-cleaning oil-water separation membrane as well as preparation method and application thereof
  • Super-hydrophilic self-cleaning oil-water separation membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Dissolve the weighed equal mass of PLLA and PDLA in an equal volume of chloroform / hexafluoroisopropanol mixed solvent to obtain a mixed solution. The mixed solution is electrospun at a rate of 1mL / h at 10-20kV to form a membrane, and then the membrane is heated at 100 Anneal at ~170°C for 1 hour; mix 5 mg / mL GA Tris solution ((pH=8)) with 1 mg / mL TBT alcohol solution at a volume ratio of 4:1, and anneal the annealed film at 25°C Immerse it in the above solution for 12 hours; then rinse it with distilled water for 1 hour, and dry it at 60° C. to obtain a superhydrophilic stereocomplex polylactic acid film.

[0059] Table 1 shows the modified liquid raw materials and their proportions, reaction time, contact angle of the obtained film to water and hydrophilic and hydrophobic properties of each embodiment and comparative example.

Embodiment 2

[0067] Dissolve the weighed equal mass of PLLA and PDLA in an equal volume of chloroform / hexafluoroisopropanol mixed solvent, electrospin at a rate of 1mL / h at 10-20kV to form a membrane, and then anneal the membrane at 100-170°C 1h; After mixing 5mg / mL GA Tris solution and 5mg / mL TBT alcohol solution at a volume ratio of 4:1, immerse the annealed film in the above solution at 25°C for 12h; then wash it with distilled water After rinsing for 1 hour, dry at 60°C to obtain a superhydrophilic stereocomplex polylactic acid film.

Embodiment 3

[0069] Dissolve the weighed equal mass of PLLA and PDLA in an equal volume of chloroform / hexafluoroisopropanol mixed solvent, electrospin at a rate of 1mL / h at 10-20kV to form a membrane, and then anneal the membrane at 100-170°C 1h; After mixing 5mg / mL GA Tris solution and 1mg / mL TBT alcohol solution at a volume ratio of 4:1, immerse the annealed film in the above solution at 25°C for 24h; then wash it with distilled water After rinsing for 1 hour, dry at 60°C to obtain a superhydrophilic stereocomplex polylactic acid film.

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Abstract

The invention belongs to the field of high polymer materials, and relates to a super-hydrophilic self-cleaning oil-water separation membrane as well as a preparation method and application thereof. The invention provides a super-hydrophilic self-cleaning oil-water separation membrane. The oil-water separation membrane is a modified membrane formed by coating the surface of a base membrane with a super-hydrophilic coating. The super-hydrophilic coating is a super-hydrophilic coating formed by a reaction of plant polyphenol and a titanium dioxide precursor and containing carboxylic acid titaniumcoordination bonds. The base membrane is a polymer membrane or a non-polymer membrane, which can be used for oil-water separation. The oil-water separation membrane obtained by the invention is super-hydrophilic and can be used for rapidly and effectively separating various oil-water layered mixtures and oil-in-water emulsion with stable surface activity. Meanwhile, under UV illumination, due tothe photocatalytic degradation characteristic of titanium dioxide, the membrane has excellent self-cleaning and anti-fouling performance, namely, the membrane has good cyclic separation performance.

Description

technical field [0001] The invention belongs to the field of polymer materials and environmental engineering, and in particular relates to a pure green superhydrophilic self-cleaning antifouling oil-water separation membrane and a preparation method thereof. Background technique [0002] Daily life and industrial production as well as frequent oil spills have caused great pollution to water resources, seriously endangering ecosystems and human health. Oil-water mixtures fall into three categories, oil-water layered solutions (droplet size greater than 150 μm), surfactant-free stabilized (droplet size between 20–150 μm), and surfactant-stabilized water-in-oil and oil-in-water emulsions. Conventional techniques now used for oil-water separation include adsorption, skimming, centrifugation, and in-situ combustion. While these methods are useful, there are many limitations: (1) only able to handle viscous oily water or immiscible oil / water mixtures, with low efficiency for oil / ...

Claims

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Application Information

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IPC IPC(8): B01D71/72B01D69/02B01D67/00B01D17/022
Inventor 包睿莹张正民杨鸣波杨伟
Owner SICHUAN UNIV
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