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Preparation method of high-flux pH-responsive oil-water separation membrane

An oil-water separation membrane, oil-water separation technology, applied in separation methods, immiscible liquid separation, liquid separation and other directions, can solve the problems of low flux, limited application, environmental pollution in the preparation process, etc., to achieve the effect of high separation efficiency

Inactive Publication Date: 2017-11-07
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the reported stimuli-responsive aqueous superoleophilic or superoleophobic surfaces have substrates, membranes are not self-supporting, or the preparation process is complicated to pollute the environment, poor strength, low flux, and cost. high disadvantage
severely limit their practical application

Method used

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  • Preparation method of high-flux pH-responsive oil-water separation membrane
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  • Preparation method of high-flux pH-responsive oil-water separation membrane

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Embodiment Construction

[0023] The preparation method of the nanofibrous oil-water separation membrane of pH response comprises the following process steps:

[0024] (1) synthesis of PAA;

[0025] Add biphenyltetracarboxylic dianhydride (BPDA) and p-phenylenediamine (PDA) respectively 2.9422g and 1.0814g (molar ratio 1:1) into a dry four-necked flask equipped with a mechanical stirrer, a thermometer, and a nitrogen gas inlet and outlet tube, and mix well ; Under strong mechanical stirring, add 40ml DMAc, react at -15°C-5°C for 24 hours, and then terminate the reaction to obtain PAA.

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Abstract

The invention relates to a preparation method of a high-flux pH-responsive oil-water separation membrane. The preparation method comprises: synthesizing polyamide acid (PAA); electro-spinning a PAA nanometer fiber membrane, and imidizing the PAA nanometer fiber membrane to a polyimide (PI) membrane; preparing pH-responsive silica nanoparticles (SNPs) / DA-TiO2 sol; modifying the PI nanometer fiber membrane with SNPs / DA-TiO2; characterizing pH responsiveness of the SNPs / DA-TiO2 / PI nanometer fiber membrane through a contact angle experiment; and testing the separation flux and efficiency via an oil-water separation experiment. The preparation method has advantages that through surface modification of a high-strength PI fiber membrane, a PI nanometer fiber membrane with biodegradability, low cost, nontoxicity, high flux and pH responsiveness is obtained. The high performance membrane material has bright application prospects in oil-water separation, sewage treatment and deep sea petroleum leakage.

Description

technical field [0001] The invention relates to a method for preparing a high-flux pH-responsive oil-water separation membrane, in particular a method for preparing a high-strength, high-flux, pH-responsive nanofiber oil-water separation membrane for gravity-driven oil-water separation. Background technique [0002] A number of stimuli-responsive filtration membranes have been reported recently. Some external stimuli such as changes in pH, temperature, and light can alter the underwater transition from superoleophilic to superoleophobic. Therefore, a material that can allow oil to pass or water to pass according to changes in external conditions can provide great flexibility in the oil-water separation process. This stimuli-responsive feature allows remote operation or automatic emergency oil-water separation process. However, most of the reported stimuli-responsive aqueous superoleophilic or superoleophobic surfaces have substrates, membranes are not self-supporting, or t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/64B01D17/02C02F1/44C02F1/40
Inventor 黄超伯赵俊涛马文静王芳饶卫东黄申林高步红李月琴吴书天
Owner NANJING FORESTRY UNIV
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