Construction and performance evaluation of TFN-FO membranes incorporated with UiO-66 nanoparticles of different sizes
With zirconiumv(Ⅳ)-carboxylate metal-organic framework(MOF)UiO-66 nanoparticles as representative,UiO-66 nanoparticles with different particle sizes were prepared and incorporated in polyamide(PA)layer of thin-film composite(TFC)membranes to investigate the impact of UiO-66 nanoparticle size on the performance of thin film composite nano-forward osmosis(TFN-FO)membranes.The effects of incorporated UiO-66 nanoparticle on the property of TFN-FO membranes were characterized by scanning electron microscopy(SEM),atomic force microscopy(AFM),water contact angle(WCA)instrument and X-ray photoelectron spectroscopy(XPS).The results showed that reducing the particle size of UiO-66 would not affect the high hydrophilicity of TFN-FO membrane.Meanwhile,as the particle size of UiO-66 decreased,the roughness of TFN-FO membrane decreased and the crosslinking degree increased.Moreover,the performance of TFN-FO membrane was evaluated by a home made forward osmosis system with deionized water and 2 mol/L sodium chloride solution as feed and draw solution.TFN-FO membrane incorporated with small particle size(50 nm)UiO-66 achieved 35%water flux improvement while maintaining a low reverse salt flux.Moreover,organic pollution experiments show that the TFN-FO membrane has good anti-fouling properties.
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