Yimeng Shi , Wenmu Feng , Jing Wang , Ziwen Dai , Dongpu Hu , Wuqi Cai , He Wen , Wenbo Yu , Sha Liang , Jiakuan Yang , Shushan Yuan
{"title":"Interfacial polymerization of poly(quaternary ammonium) membranes with extreme acid stability for phosphorus recovery from phosphogypsum leachate","authors":"Yimeng Shi , Wenmu Feng , Jing Wang , Ziwen Dai , Dongpu Hu , Wuqi Cai , He Wen , Wenbo Yu , Sha Liang , Jiakuan Yang , Shushan Yuan","doi":"10.1016/j.memsci.2025.124370","DOIUrl":null,"url":null,"abstract":"<div><div>Phosphogypsum leachate, a phosphorus-rich wastewater, poses significant threats to aquatic ecosystems. Nanofiltration represents a promising approach for phosphorus recovery from such leachate by selectively allowing phosphorus permeation while rejecting multivalent cations. However, the widespread application of conventional polyamide nanofiltration membranes in phosphogypsum leachate treatment is constrained by their poor acid stability. Herein, To address this limitation, an acid-resistant, highly positively charged nanofiltration membrane was fabricated by synthesizing a crosslinked poly(quaternary ammonium) selective layer on a polysulfone support via a temperature-regulated interfacial polymerization between N,N,N′,N″,N″-pentamethyldiethylenetriamine (PMDTA) and 1,3,5-Tris(bromomethyl)benzene (TBB). Remarkably, elevating reaction temperature not only enables the formation of an ultrathin selective layer (30 nm) with dense cross-linking (MWCO = 471 Da) but also achieves rapid synthesis within 2 min. The poly(quaternary ammonium) membranes achieved a high MgCl<sub>2</sub> rejection (97.17 %) and a high P permeation (88.16 %) owing to the exceptionally strong positive charge provided by quaternary ammonium groups. Moreover, the “C–N<sup>+</sup>” bonds within the poly(quaternary ammonium) structure contribute to exceptional acid stability. The membranes remain stable after prolonged immersion in 1.5 M H<sub>2</sub>SO<sub>4</sub> for 40 days (MgCl<sub>2</sub> rejection >95 %). This breakthrough combination of ultrafast reaction, high cation selectivity and outstanding acid stability positions the poly(quaternary ammonium) membrane as a highly viable candidate for phosphogypsum leachate treatment applications.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"733 ","pages":"Article 124370"},"PeriodicalIF":8.4000,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Membrane Science","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0376738825006830","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Phosphogypsum leachate, a phosphorus-rich wastewater, poses significant threats to aquatic ecosystems. Nanofiltration represents a promising approach for phosphorus recovery from such leachate by selectively allowing phosphorus permeation while rejecting multivalent cations. However, the widespread application of conventional polyamide nanofiltration membranes in phosphogypsum leachate treatment is constrained by their poor acid stability. Herein, To address this limitation, an acid-resistant, highly positively charged nanofiltration membrane was fabricated by synthesizing a crosslinked poly(quaternary ammonium) selective layer on a polysulfone support via a temperature-regulated interfacial polymerization between N,N,N′,N″,N″-pentamethyldiethylenetriamine (PMDTA) and 1,3,5-Tris(bromomethyl)benzene (TBB). Remarkably, elevating reaction temperature not only enables the formation of an ultrathin selective layer (30 nm) with dense cross-linking (MWCO = 471 Da) but also achieves rapid synthesis within 2 min. The poly(quaternary ammonium) membranes achieved a high MgCl2 rejection (97.17 %) and a high P permeation (88.16 %) owing to the exceptionally strong positive charge provided by quaternary ammonium groups. Moreover, the “C–N+” bonds within the poly(quaternary ammonium) structure contribute to exceptional acid stability. The membranes remain stable after prolonged immersion in 1.5 M H2SO4 for 40 days (MgCl2 rejection >95 %). This breakthrough combination of ultrafast reaction, high cation selectivity and outstanding acid stability positions the poly(quaternary ammonium) membrane as a highly viable candidate for phosphogypsum leachate treatment applications.
期刊介绍:
The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.