High-performance thin-film composite polyamide membrane upcylcled from biopolymer-fouled substrates and preparation method thereof

US11590455B2 · kind B2 · utility

Assignees

• TONGJI UNIVERSITY · CN
• TIANJIN POLYTECHNIC UNIVERSITY · CN

Inventors

• Zhiwei Wang · Beijing, CN
• Ruobin Dai · Shanghai, CN
• Hongwei Zhang · Tianjin, CN
• Liang Wang · Rochester Hills, US
• Hongyi Han · Shanghai, CN
• Tianlin Wang · Shanghai, CN

Key dates

• Filing date: May 13, 2020
• Grant date: Feb 28, 2023
• Expiry date: May 18, 2040

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D71/08
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A high-performance thin-film composite polyamide membrane upcycled from a substrate fouled with a biopolymer and a preparation method thereof are provided. The method includes fouling the substrate preferably with the biopolymer to obtain a composite of the substrate and a biopolymer foulant layer; then immersing the composite into a first solution formed by dissolving a polyamine monomer in water, followed by taking the composite out of the first solution and removing excess droplets from a surface of the composite; then immersing the composite treated in the previous step into a second solution formed by dissolving an acyl chloride monomer in n-hexane for interfacial polymerization to form a rejection layer on the surface of the composite; and after completion of the reaction, taking the composite out of the second solution, followed by drying and heat treatment, to obtain the target polyamide membrane.