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Preparation method for pH-responsive cross-linked multilayer membrane applied to oil-water separation

An oil-water separation and responsive technology, applied in the field of water treatment, can solve the problems of harsh polymerization conditions, time-consuming, complicated process, etc., achieve high anti-fouling performance, high separation efficiency, and reduce membrane fouling effects

Active Publication Date: 2018-12-18
HAINING GREEN UNIVERSE TEXTILE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polymerization conditions of these grafting methods are harsh, the process is complex and time-consuming

Method used

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  • Preparation method for pH-responsive cross-linked multilayer membrane applied to oil-water separation
  • Preparation method for pH-responsive cross-linked multilayer membrane applied to oil-water separation
  • Preparation method for pH-responsive cross-linked multilayer membrane applied to oil-water separation

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preparation example Construction

[0033] A method for preparing a pH-responsive cross-linked multilayer membrane for oil-water separation, comprising:

[0034] 1) Dissolve the weighed dopamine hydrochloride in tris-hydrochloride buffer solution (pH 7.5-9) to prepare a dopamine hydrochloride solution with a concentration of 2-50 g / L;

[0035] 2) Put the microfiltration membrane soaked with ethanol into the dopamine hydrochloride solution, shake and deposit for 12-72 h;

[0036] 3) Take out the microfiltration membrane, rinse it with ultrapure water first, then immerse it in ethanol, wash it with ultrapure water, and dry it for later use;

[0037] 4) Synthesis of polyacrylic acid-dopamine: prepare PBS buffer with a pH of 6 with dipotassium hydrogen phosphate and potassium dihydrogen phosphate, and add 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride in sequence Salt, N-hydroxysuccinimide and polyacrylic acid were dissolved in PBS buffer, filled with nitrogen and deoxygenated for 20-40 minutes, then ad...

Embodiment 1

[0042] A method for preparing a pH-responsive cross-linked multilayer membrane for oil-water separation, comprising:

[0043] 1) The weighed dopamine hydrochloride was dissolved in tris-hydrochloride buffer solution (pH 8.5) to prepare a dopamine hydrochloride solution with a concentration of 2 g / L;

[0044] 2) The polypropylene microfiltration membrane soaked with ethanol was placed in the dopamine hydrochloride solution and shaken for 12 h;

[0045] 3) Take out the polypropylene microfiltration membrane, rinse it with ultrapure water first, then immerse it in ethanol, wash it with ultrapure water, and dry it for later use;

[0046] 4) Synthesis of polyacrylic acid-dopamine: prepare PBS buffer with a pH of 6 with dipotassium hydrogen phosphate and potassium dihydrogen phosphate, and add 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride in sequence Salt, N-hydroxysuccinimide and polyacrylic acid were dissolved in PBS buffer, filled with nitrogen and deoxygenated for ...

Embodiment 2

[0052] A method for preparing a pH-responsive cross-linked multilayer membrane for oil-water separation, comprising:

[0053] 1) The weighed dopamine hydrochloride was dissolved in tris-hydrochloride buffer solution (pH 7.5) to prepare a dopamine hydrochloride solution with a concentration of 20 g / L;

[0054] 2) Put the polyvinylidene fluoride microfiltration membrane infiltrated with ethanol into the dopamine hydrochloride solution, shake and deposit for 24 h;

[0055] 3) Take out the polyvinylidene fluoride microfiltration membrane, first rinse it with ultrapure water, then immerse it in ethanol, wash it with ultrapure water, and dry it for later use;

[0056] 4) Synthesis of polyacrylic acid-dopamine: prepare PBS buffer with a pH of 6 with dipotassium hydrogen phosphate and potassium dihydrogen phosphate, and add 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride in sequence Salt, N-hydroxysuccinimide and polyacrylic acid were dissolved in PBS buffer, filled with n...

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Abstract

The invention discloses a preparation method for a pH-responsive cross-linked multilayer membrane applied to oil-water separation, belonging to the field of water treatment. The pH-responsive cross-linked multilayer membrane is prepared by subjecting dopamine to self-polymerization on a microfiltration membrane so as to achieve hydrophilic modification and then assembling an anionic polymer and acationic polymer by using a layer-by-layer self-assembling method to obtain a pH-responsive polymer coating. The surface of the obtained polymer coating is positively charged under the condition thata pH value is less than the pKa of the anionic polymer and is negatively charged under the condition that the pH value is more than the pKa of the anionic polymer. In the pH-responsive cross-linked multilayer membrane prepared by using the method, hydrophilic macromolecules and the microfiltration membrane have high bonding fastness, and the membrane has large flux, good oil-water separation effect and good flexibility; the preparation method is simple in process and low in cost; and the prepared membrane has pH responsiveness and can be recycled.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a preparation method of a pH-responsive cross-linked multilayer membrane used for oil-water separation. Background technique [0002] In recent years, the oil pollution damage caused by oil spills and other industrial wastewater has caused serious threats to the ecological environment and human health. Traditional oil-water separation technologies, such as oil cleaners, centrifuges (CN 207581418 U), depth filters, flotation machines, etc., have disadvantages such as low separation efficiency, high operating costs, cumbersome equipment, and easy generation of secondary pollutants. It is suitable for the separation of oil-water mixture, but it cannot separate the stable emulsion containing surfactant. The exploration of the process of separating surfactant-stabilized emulsions with high efficiency and low consumption has attracted widespread attention and heated discussions, but i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12C02F1/40
CPCB01D67/0002B01D69/125C02F1/40
Inventor 吴金丹丁雅杰张先盛郑今欢王际平
Owner HAINING GREEN UNIVERSE TEXTILE TECH CO LTD
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