Metal-Organic-Framework-based nanofiltration membranes for selective multi-cationic recovery from seawater and brines

• DOI: 10.1016/j.memsci.2023.121941
• Publication Date: 2023-07-17T15:40:10Z
• Authors: C. Morgante; X. Ma; X. Chen; D. Wang; V. Boffa; V. Stathopoulos; J. Lopez; J.L. Cortina; A. Cipollina; A. Tamburini; G. Micale
• Keywords: Nanofiltration; Brine; Membrane Technology; Ultrafiltration (renal)

Nanofiltration (NF) is gaining a role of increasing importance in Zero Liquid Discharge (ZLD)/Minimal (MLD) systems, enhancing the efficiency downstream technologies to recover valuable minerals from seawater and brines. However, often purity recovered does not meet market specifications, making ZLD/MLD currently economically unfeasible. To such end, this study, novel positively charged NF membrane was developed enhance magnesium calcium selectivity. The comprised: (i) an ultrafiltration substrate (ii) active layer that incorporated NH2-MIL-101(Al) ZnO nanoparticles chitosan matrix. influence different loadings on structure, selectivity water permeability investigated. Initial filtration tests with single-salt solutions at 1000 ppm (NaCl, Na2SO4, MgCl2, CaCl2) showed 35%wt presented highest rejections MgCl2 (90.10%) CaCl2 (86.49%). Selectivity towards higher than those commercial membranes (NF90 NF270) introduced recent literature. synthesized work also tested synthetic brine trans-membrane pressure 30 bar. Results highlighted intriguing competitiveness terms NF90 NF270 within field both valorization.