Construction of SiO2/porous DA-g-C3N4 composite nanofiltration membranes with high Mg2+/Li+ selectivity based on reverse interfacial polymerization
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Le résumé fourni par la source
It is often difficult for thin-film composite (TFC) nanofiltration (NF) membranes to balance high separation selectivity and high permeability, and the contradiction between the two will lead to their overall performance constraints. In this study, a dual-phase regulation strategy is proposed, which adopts the in-situ sol method and the composite strategy of introducing two-dimensional materials for the preparation of organic-inorganic cross-linked polyamide (PA) NF membranes. A trimesoyl chloride (TMC) organic phase solution containing tetraethyl orthosilicate was first introduced onto the polyethersulfone (PES) substrate, followed by contact with a polyethyleneimine (PEI) aqueous phase solution containing dopamine-functionalized carbon nitride (DA-g-C 3 N 4 ), during which silicon dioxide (SiO 2 )/Si–O–Si domains were generated in situ within the PA layer. These domains restricted the free volume of the PA layer, narrowed the effective pore-size distribution, and suppressed nonselective defects, while the embedded DA-g-C 3 N 4 improved the compatibility between the nanofillers and the PA layer, thereby producing P-1Si-0.025CN membranes with an effective pore size of 0.4 nm. Compared with the P-NF membrane prepared by reverse interfacial polymerization of TMC and PEI directly on the PES substrate, Mg 2+ /Li + separation factor (SF) increased to 67.2 (Mg 2+ /Li + mass ratio is 20), salt solution flux was 27.1 LMH, separation and permeation capacity of mixed salt was enhanced, salt solution flux has increased by 4 times, and the SF has increased by 7 times, Mg 2+ /Li + ratio decreased from 20 in feed to 0.71 in permeation process. Moreover, it exhibited excellent separation performance in diluted salt lake brine, with an Mg 2+ rejection rate exceeding 98%, and it also exhibited high fouling resistance and long-term stability.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Construction of SiO2/porous DA-g-C3N4 composite nanofiltration membranes with high Mg2+/Li+ selectivity based on reverse interfacial polymerization
- Date Crossref
- 01/11/2026
- Éditeur
- Elsevier BV
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Qinghai University pays non établi dans la noticeUniversité ou école supérieure
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State Key Laboratory of Chemical Engineering pays non établi dans la noticeStructure de recherche
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Beijing University of Chemical Technology pays non établi dans la noticeUniversité ou école supérieure
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Tsinghua University State Key Laboratory of Chemical Engineering and Low-Carbon Technology pays non établi dans la noticeUniversité ou école supérieure
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Changzhou University pays non établi dans la noticeUniversité ou école supérieure
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Shaoxing University pays non établi dans la noticeUniversité ou école supérieure
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College of chemical engineering Collaborative Innovation Center of Chemistry and Process Engineering for Salt Lake Resource pays non établi dans la noticeUniversité ou école supérieure
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ORDOS Laboratory pays non établi dans la noticeStructure de recherche
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School of Materials Science and Engineering Jiangsu Key Laboratory of Environmentally Friendly Polymer Materials pays non établi dans la noticeUniversité ou école supérieure
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Zhejiang University Shaoxing Institute pays non établi dans la noticeUniversité ou école supérieure
Qinghai University, State Key Laboratory of Chemical Engineering et Beijing University of Chemical Technology, avec 7 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.