Postgraduate Seminar Presentation : Thin-Film Nanocomposite (TFN) Membranes Incorporated with Super-Hydrophilic Metal-Organic Framework (MOF) UiO-66: Towards Enhancement of Water Flux and Salt Rejection

Speaker Ma Dangchen (Supervisor: A/Prof Chen Shing Bor)

Host Department of Chemical and Biomolecular Engineering

Date/Time 25 May - 25 May, 2.00pm

Venue E5-02-32 , Faculty of Engineering, National University of Singapore

Synopsis

Zirconiumv (IV)-carboxylate metal-organic framework (MOF) UiO-66 nanoparticles were successfully synthesized and incorporated in the polyamide (PA) selective layer to fabricate novel thin-film nanocomposite (TFN) membranes. Compared to unmodified pure polyamide thin-film composite (TFC) membranes, the incorporation of UiO-66 nanoparticles significantly changes the membrane morphology and chemistry, leading to an improvement of intrinsic separation properties due to the molecular sieving and super-hydrophilic nature of UiO-66 particles. The best performing TFN-U2 (0.1 wt% particle loading) membrane not only shows a 52% increase of water permeability but also maintains salt rejection levels (~95%) similar to the benchmark. The effects of UiO-66 loading on the forward osmosis (FO) performance were also investigated. Incorporation of 0.1 wt.% UiO-66 produced a maximum water flux increase of 40% and 25% over the TFC control under PRO and FO modes, when 1 M NaCl was used as the draw solution against deionized water feed. Meanwhile, solute reverse flux was maintained at a relatively low level. In addition, TFN-U2 membrane displayed a relatively linear increase in FO water flux with increasing NaCl concentration up to 2.0 M, suggesting a slightly reduced internal concentration polarization effect. To our best knowledge, the current study is the first to consider implementation of Zr-MOFs (UiO-66) onto TFN-FO membranes.

Biography