PVDF Composite Membranes with Hydrophobically-Capped CuONPs for Direct-Contact Membrane Distillation

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dc.contributor.authorSaldias, Cesar
dc.contributor.authorTerraza, Claudio A.
dc.contributor.authorLeiva, Angel
dc.contributor.authorKoschikowski, Joachim
dc.contributor.authorWinter, Daniel
dc.contributor.authorTundidor-Camba, Alain
dc.contributor.authorMartin-Trasanco, Rudy
dc.date.accessioned2025-01-20T22:16:22Z
dc.date.available2025-01-20T22:16:22Z
dc.date.issued2021
dc.description.abstractWater scarcity is an imminent problem that humanity is beginning to attempt to solve. Among the several technologies that have been developed to mitigate water scarcity, membrane distillation is of particular note. In the present work, CuO nanoparticles capped with 1-octanethiol (CuONPs@CH) or 1H,1H,2H,2H-perfluorodecanethiol (CuONPs@CF) are prepared. The nanoparticles are characterized by FT-IR and TGA methods. Two weight losses are observed in both cases, with the decomposition of the organic fragments beginning at 158 degrees C and 230 degrees C for CuONPs@CF and CuONPs@CH, respectively. Flat sheet PVDF composite membranes containing nanoparticles are prepared by the casting solution method using nanoparticle concentrations that ranged between 2-20% with a non-woven polyester fabric as support. The obtained membranes showed a thickness of 240 +/- 40 mu m. According to water contact angle (87 degrees for CuONPs@CH and 95 degrees for CuONPs@CF, both at 10% w.t) and roughness (12 pixel for CuONPs@CH and 14 pixels for CuONPs@CF, both at 10% w.t) determinations, the hydrophobicity of membranes changed due to a decrease in surface energy, while, for naked CuONPs, the roughness factor represents the main role. Membranes prepared with capped nanoparticles showed similar porosity (60-64%). SEM micrographs show asymmetric porous membranes with a 200-nm surface pore diameter. The largest finger-like pores in the membranes prepared with CuONPs, CuONPs@CH and CuONPs@CF had values of 63 +/- 10 mu m, 32 +/- 8 mu m, and 45 +/- 10 mu m, respectively. These membranes were submitted to a direct contact membrane distillation module and flux values of 1.8, 2.7, and 3.9 kg(m(2)center dot h)(-1) at Delta T = 30 degrees C were obtained for the CuONPs, CuONPs@CH, and CuONPs@CF, respectively. The membranes showed 100% salt rejection during the testing time (240 min).
dc.fuente.origenWOS
dc.identifier.doi10.3390/nano11061497
dc.identifier.eissn2079-4991
dc.identifier.urihttps://doi.org/10.3390/nano11061497
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94528
dc.identifier.wosidWOS:000667880300001
dc.issue.numero6
dc.language.isoen
dc.revistaNanomaterials
dc.rightsacceso restringido
dc.subjectcomposite membranes
dc.subjecthydrophobically-capped CuONPs
dc.subjectmembrane distillation
dc.subjectfluorinated alkylthiol capping agents
dc.subject.ods06 Clean Water and Sanitation
dc.subject.odspa06 Agua limpia y saneamiento
dc.titlePVDF Composite Membranes with Hydrophobically-Capped CuONPs for Direct-Contact Membrane Distillation
dc.typeartículo
dc.volumen11
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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