Preparation of ceramic-based MOF membranes for forward osmosis desalination
The strategic development of innovative forward osmosis membranes holds paramount significance in advancing membrane separation technology,addressing water resource and environmental challenges,and enhancing the efficiency and sustainability of separation processes.In this study,ceramic-supported Zr-fum-MOF crystal seeds were prepared using the hot dip-coating seeding method,with ceramic membranes as the substrates for secondary growth.The subsequent examination focused on evaluating the desalination performance of the ceramic-based Zr-fum-MOF-0.1％membrane in forward osmosis,with a specific emphasis on water-salt separation under diverse operational conditions.Results indicate that the hot dip coating technique effectively facilitated the uniform deposition of MOF crystal seeds on the ceramic membrane's surface.Notably,by employing a 0.1％mass fraction of crystal seed liquid and conducting three dip coating iterations,the secondary growth process yielded polycrystalline membranes characterized by a well inter-grown membrane structure with uniform thickness.In the context of forward osmosis desalination tests,employing deionized water as the feed solution and a draw solution comprising 2 mol/L sodium chloride,the ceramic-based Zr-fum-MOF membranes demonstrated a noteworthy water flux exceeding 9.86 L/(m2·h).Simultaneously,these membranes exhibited a low specific salt flux(0.43 g/L).Its application to real seawater desalination also showed good operational and structural stability.The findings underscore the potential of the ceramic-based Zr-fum-MOF membranes,synthesized in this study,for application in forward osmosis desalination,thereby contributing valuable insights and prospects to membrane desalination process.
water treatmentdesalinationceramic membranemetal-organic framework membranefor-ward osmosis
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