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Method for preparation of oil-water separation membrane by filter paper modification and application thereof

A technology of oil-water separation membrane and filter paper, applied in separation methods, liquid separation, semi-permeable membrane separation, etc., can solve the problems of poor reusability of membranes, easy pollution of membranes, etc., achieve good oil-water separation, and solve the problem of easy pollution of membranes Effect

Active Publication Date: 2017-02-22
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the existing problems of the current hydrophobic oil-water separation membranes, such as easy pollution of the membrane, rapid water flux attenuation, and poor reusability of the membrane, the purpose of the present invention is to provide a method and application for preparing an oil-water separation membrane by modifying filter paper

Method used

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  • Method for preparation of oil-water separation membrane by filter paper modification and application thereof
  • Method for preparation of oil-water separation membrane by filter paper modification and application thereof
  • Method for preparation of oil-water separation membrane by filter paper modification and application thereof

Examples

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Embodiment 1

[0033] Example 1 HO-PEG2000-NHS Modified Ordinary Filter Paper to Construct Oil-Water Separation Membrane

[0034] (1) The ordinary qualitative filter paper was dip-coated for 6 h in contact with the dopamine aqueous solution with a pH of 6.9, and a light gray polydopamine-mediated layer was automatically formed on the surface of the filter paper. Placed in 40°C air environment for 8 hours to form a stable polydopamine coating;

[0035] (2) Prepare a solution of polyethylene glycol (molecular weight 2000, HO-PEG2000-NHS for short) containing active ester groups with a buffer solution at pH 7, and the concentration of the polyethylene glycol solution is 2 mg / mL. The structural formula is as follows:

[0036]

[0037] Wherein, n is a natural number of 40 to 50, and the active ester group in the polyethylene glycol molecule is: ;

[0038] (3) Immerse the dopamine-modified filter paper in the polyethylene glycol solution containing active ester groups at 40 °C for 18 h to m...

Embodiment 2

[0041] Example 2 Construction of Oil-Water Separation Membrane by HO-PEG10000-NHS Modified Ordinary Filter Paper

[0042] (1) The ordinary qualitative filter paper was dip-coated for 6 h in contact with the dopamine aqueous solution with a pH of 7.5, and a light gray polydopamine-mediated layer was automatically formed on the surface of the filter paper. Placed in 40°C air environment for 8 hours to form a stable polydopamine coating;

[0043] (2) A solution of polyethylene glycol 10000 (HO-PEG10000-NHS) containing active ester groups was prepared with a buffer solution with a pH of 6.5, and the concentration of the polyethylene glycol solution was 2.5 mg / mL. The structural formula is as follows:

[0044] , where n is a positive integer of 200~220;

[0045] (3) Immerse the dopamine-modified filter paper in the polyethylene glycol solution containing active ester groups at 40 °C for 18 h to make the active ester groups react with the amino groups of the polydopamine coating...

Embodiment 3

[0048] Example 3 Modified filter paper for performance test and oil-water separation experiment

[0049]The modified filter paper prepared in Example 1 was tested for contact angle. The static contact angle of the modified filter paper is 4°, indicating that the filter paper obtained by this preparation method has superhydrophilicity. Comparison of filter paper before and after modification figure 2 shown.

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Abstract

The invention relates to a method for preparation of an oil-water separation membrane by filter paper modification and application thereof. Common qualitative filter paper is used as the base material, a PDA mediated layer is constructed on the filter paper surface through the adhesive action of polydopamine, and then active ester group-carrying polyethylene glycol or a zwitterionic polymer and the amino on the PDA mediated surface layer are subjected to covalent grafting fixation on the surface through amidation, the hydrophilic interaction of a PEG chain segment and its terminal hydroxyl or the zwitterionic polymer is utilized to improve the surface hydrophility of the modified filter paper, so that the modified filter paper can be well used for oil-water separation. The oil-water separation membrane constructed by the method provided by the invention has hydrophilic / oleophobic characteristic and obvious pollution resistance, and can be used for a long time or repeatedly.

Description

technical field [0001] The invention relates to a method for preparing an oil-water separation membrane by modifying filter paper and its application. Background technique [0002] Whether it is environmental governance, oil recovery and sewage treatment and reuse, effective separation of oily sewage is required. The existing forms of oil in oily sewage can be divided into four types: the particle size of oil is larger than 150 μm, which is called oil slick; oil slick easily forms an oil film on the water surface, and the oil can be separated from the sewage by gravity. The particle size of the oil is between 20 μm and 150 μm, which is called dispersed oil; dispersed oil is unstable, and after standing for a period of time, it can aggregate to form larger oil droplets and turn into slick oil, and the treatment method is relatively simple. The particle size of the oil is less than 20 µm, which is called emulsified oil. It is difficult to merge the oil particles in the emulsi...

Claims

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Application Information

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IPC IPC(8): B01D17/022B01D67/00B01D69/02
CPCB01D17/02B01D67/0093B01D69/02B01D2239/0421B01D2325/36
Inventor 宫永宽董景康孟凡宁
Owner NORTHWEST UNIV