High-flux and high-selectivity acid-resistant nanofiltration membrane based on special base and preparation method of acid-resistant nanofiltration membrane

Abstract

The invention discloses a high-flux and high-selectivity acid-resistant nanofiltration membrane based on a Rule base and a preparation method thereof.The preparation method comprises the steps that firstly, a Rule base amine monomer is prepared, and the Rule base amine monomer containing a twisted and rigid structure and a piperazine monomer are dissolved in a polar solvent together; the preparation method comprises the following steps: preparing a membrane casting solution from polyethersulfone, blade-coating the membrane casting solution on a non-woven fabric, soaking the non-woven fabric in a multi-acyl chloride organic phase solution, and introducing a special base amine monomer with a rigid twisted structure into a polyamide separation layer by a method of combining an immersion precipitation phase inversion method and an interfacial polymerization method. The high-flux and high-selectivity acid-resistant nanofiltration membrane based on the special base is prepared. Compared with a traditional nanofiltration membrane, the prepared nanofiltration membrane has the advantages that the flux is greatly improved, the nanofiltration membrane has better selectivity and acid resistance, meanwhile, the preparation process of the nanofiltration membrane is simplified by selecting a phase separation and interfacial polymerization combined method, and the nanofiltration membrane has a good industrial application prospect.

Description

technical field [0001] The invention relates to a high-throughput and high-selectivity acid-resistant nanofiltration membrane based on Telleg base and a preparation method thereof. Background technique [0002] The shortage of fresh water resources is one of the most serious problems facing the world. Clean water only accounts for 0.8% of the global fresh water resources. In response to this situation, many polluted water sources are used after proper treatment. As one of the most advanced water treatment technologies, nanofiltration technology has attracted extensive attention in the field of modern membrane separation. Nanofiltration is a new pressure-driven membrane separation technology between ultrafiltration and reverse osmosis. It can effectively separate monovalent and multivalent salts, and intercept organic compounds with a molecular weight of 200-1000Da. It has high efficiency, energy saving, and separation accuracy. With the advantages of high efficiency, wide r...

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Problems solved by technology

However, the miscibility of nanomaterials and polymer selective layer is poor, it is easy to cause some non-selective defects, and then affect the separation performance of nanofiltration membrane, and the acid resistance of the prepared nanofiltration membrane is generally

At the same time, most nanomaterials are complex to synthesize and cost high, and the industrialization of their nano-modified membranes faces severe challenges.

In addition, researchers have also tried to introduce some new monomers into the field of acid-resistant nanofiltration membranes, such as sulfonyl chloride, melamine, etc. (J. 496), the introduction of such monomers into nanofiltration membranes has improved the acid resistance of nanofiltration membranes to a certain extent, but the disadvantages are that the water flux, salt rejection rate and ion selectivity of the membranes are different. The degree of decline, which limits the application of nanofiltration membranes

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