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Super-hydrophobic/super-oleophilic multilevel structure polyether sulfone oil-water separation membrane and preparation method thereof

A technology of oil-water separation membrane and polyethersulfone membrane, which is applied in separation methods, permeation/dialysis water/sewage treatment, liquid separation, etc. It can solve the problems of unsuitable promotion, high cost and low flux, and achieve excellent superhydrophobicity properties, excellent corrosion resistance, effects of high porosity

Active Publication Date: 2019-12-13
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can efficiently separate oil-water mixtures and water-in-oil emulsions, but in the preparation method, a polymer film with a rough structure of silicon dioxide on the surface is used as a solid substrate, and the rough structure of silicon dioxide needs to be fluorinated, resulting in expensive The cost price also causes some pollution to the environment
[0004] Wang et al. (Separation and Purification Technology 212(2019) 597–604) prepared a superhydrophobic mesoporous silica airgel membrane, which can efficiently separate stable water-in-oil emulsions containing emulsifiers, and the separation efficiency It can reach more than 99.9%, but because it is a mesoporous separation membrane, there are problems of low flux and too small particle size range of the emulsion that can be separated, so it is not suitable to promote this method

Method used

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  • Super-hydrophobic/super-oleophilic multilevel structure polyether sulfone oil-water separation membrane and preparation method thereof
  • Super-hydrophobic/super-oleophilic multilevel structure polyether sulfone oil-water separation membrane and preparation method thereof
  • Super-hydrophobic/super-oleophilic multilevel structure polyether sulfone oil-water separation membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 1) Add 2.2g of polyethersulfone (melt index 0.5g / 10min), 0.8g of silica micropowder (particle size 80μm) and 0.4g of polyvinylpyrrolidone into a scale filled with 16.6g of N,N-dimethylformamide In a measuring bottle, heat and stir at 50°C for 1 hour to obtain the casting solution and vacuum degassing, pour the prepared solution on a polytetrafluoroethylene mold with a 1000-mesh filter cloth on the surface, and stand still in the air for 30 seconds Transfer the mold together with the filter cloth to distilled water for exchange for 6 hours, remove the filter cloth from the mold and peel off the membrane from the filter cloth to obtain an asymmetric single-sided silicon dioxide-containing porous polyethersulfone membrane.

[0026] 2) Add 0.727g of hexadecyltrimethoxysilane into a beaker filled with a mixture of 30mL of ammonia water and ethanol at pH=8, immerse the porous polyethersulfone membrane obtained in step 1), and hydrolyze at 60°C After 1h, take it out and rinse ...

Embodiment 2

[0029] 1) Add 2.2g of polyethersulfone (melt index 0.6g / 10min), 1.6g of silica micropowder (particle size 70μm) and 0.8g of polyvinylpyrrolidone into a scale filled with 15.4g of N,N-dimethylformamide In a measuring bottle, heat and stir at 60°C for 0.8h to obtain the casting solution and vacuum degassing, pour the prepared solution on a polytetrafluoroethylene mold with a 1000-mesh filter cloth on the surface, let it rest in the air for 40 seconds The mold and the filter cloth were transferred to distilled water for 7 hours, and the filter cloth was removed from the mold and the membrane was peeled off from the filter cloth to obtain an asymmetric single-sided silicon dioxide-containing porous polyethersulfone membrane.

[0030] 2) Add 0.727g of hexadecyltrimethoxysilane into a beaker containing 30mL of ammonia water and ethanol mixture (pH=8), immerse the porous polyethersulfone membrane obtained in step 1), and hydrolyze at 60°C for 1h, After taking it out, rinse it three t...

Embodiment 3

[0033]1) Add 2.4g of polyethersulfone (melt index 0.7g / 10min), 1.2g of silica micropowder (particle size 60μm) and 0.5g of polyvinylpyrrolidone into a scale filled with 15.9g of N,N-dimethylformamide In a measuring bottle, heat and stir at 70°C for 0.7h to obtain the casting solution and vacuum degassing, pour the prepared solution on a polytetrafluoroethylene mold with a 1000-mesh filter cloth on the surface, let it rest in the air for 30 seconds The mold and the filter surface were transferred to distilled water for 8 hours, and the filter cloth was removed from the mold and the membrane was peeled off from the filter cloth to obtain an asymmetric single-side silicon dioxide-containing porous polyethersulfone membrane.

[0034] 2) Add 1.44g of hexadecyltrimethoxysilane into a beaker containing 60mL of ammonia water and ethanol mixture (pH=8.5), immerse the porous polyethersulfone membrane obtained in step 1), and hydrolyze at 70°C for 1h, After taking it out, rinse it three ...

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Abstract

The invention discloses a super-hydrophobic / super-oleophilic multilevel structure polyether sulfone oil-water separation membrane and a preparation method thereof and belongs to the technical field ofoil-water separation materials. The super-hydrophobic / super-oleophilic multilevel structure polyether sulfone oil-water separation membrane is prepared with two steps of a non-solvent induced phase method and a sol-gel method by taking polyether sulfone, silicon dioxide micro powder, tetraethyl silicate and hexadecyltrimethoxysilane as basic raw materials. The prepared super-hydrophobic / super-oleophilic multilevel structure polyether sulfone oil-water separation membrane has excellent super-hydrophobic property with a contact angle greater than 150 degrees, a rolling angle less than 10 degrees and an oil contact angle less than 10 degrees, has the characteristics of high porosity and high flux with the porosity reaching up to 79.59 percent and the flux reaching up to 2388.53L / h.m2, can effectively separate different kinds of water-in-oil emulsions as well as has the separation efficiency greater than 99 percent as for an emulsifier-free emulsion and greater than 98 percent as for an emulsifier-contained emulsion.

Description

technical field [0001] The invention belongs to the technical field of oil-water separation materials, and in particular relates to a polyethersulfone oil-water separation membrane with a superhydrophobic / superoleophilic multi-level structure and a preparation method thereof. Background technique [0002] With the rapid development of petroleum, chemical industry, machinery manufacturing, metal smelting, textile and other industries, a large amount of emulsion waste oil is produced every day. If it is discharged directly, it will cause harm to human health and ecological well-being. Due to the presence of emulsifiers, the water / oil emulsion system containing water droplets of micron and nanometer sizes can exist very stably, so it is difficult to separate them effectively. Conventional separation methods such as physical sedimentation, chemical demulsification and biological treatment often involve problems of low separation efficiency and secondary pollution, which affect ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/02B01D67/00B01D61/40C02F1/44C02F1/40
CPCB01D61/40B01D67/0079B01D69/02B01D71/68B01D2325/02B01D2325/30B01D2325/38C02F1/40C02F1/44
Inventor 牟建新陈瑞姜振华李澍吴焓
Owner JILIN UNIV
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