Preprint Article Version 1 This version is not peer-reviewed

Preparation [email protected]/Non-Woven Polyester Composite Membrane: Structural Influence of Nanoparticles Addition

Version 1 : Received: 5 July 2018 / Approved: 6 July 2018 / Online: 6 July 2018 (09:03:09 CEST)

A peer-reviewed article of this Preprint also exists.

Terraza, C.A.; Martin, R.; Saldías, C.; González, M.; Leiva, Á.; Tundidor-Camba, A. Preparation of [email protected]/Non-Woven Polyester Composite Membrane: Structural Influence of Nanoparticle Addition. Polymers 2018, 10, 862. Terraza, C.A.; Martin, R.; Saldías, C.; González, M.; Leiva, Á.; Tundidor-Camba, A. Preparation of [email protected]/Non-Woven Polyester Composite Membrane: Structural Influence of Nanoparticle Addition. Polymers 2018, 10, 862.

Journal reference: Polymers 2018, 10, 862
DOI: 10.3390/polym10080862

Abstract

Membrane distillation techniques appear as one of the most promise alternative to guarantee the availability of potable water in time of scarce of this essential resource. For membrane preparation, polyvinylidene fluoride (PVDF) is preferred due to the easier synthesis procedures with respect to other fluorine based polymers. In this work, copper oxide nanoparticles (CuONPs) at different weight percent (wt.%), embedded in PVDF membranes supported on non-woven polyester fabric (NWPET) were prepared by the phase-inversion method, and characterized by spectroscopy (ATR-FTIR, Raman) and electron microscopy techniques (SEM). The PVDF deposited onto the NWPET was highly composed by its polar -phase (F()= 53 %) which was determined from the ATR-FTIR spectrum. The F() value was kept constant, in the whole range of CuONPs studied (2-10 wt.%) as was determined from the ATR-FTIR spectrum. The absence of signals corresponding to CuONPs in the ATR-FTIR spectra and the appearance of peaks at 297, 360 and 630 cm-1 in the Raman spectra of the membranes suggested that the CuONPs are preferably located in the inner of the membrane but not on its surface. The membrane morphologies were characterized by SEM. From the obtained SEM micrographs, a decrease and increase in the amount of micropores and nanopores, respectively, near to the surface and intercalated in the finger-like layer were observed. As result of the CuONPs addition, the nanopores in the sponge-like layer decrease in size. The values of water contact angle (WCA) measurements showed a trend to decrease from 94° to 80° upon the addition of CuONPs (2-10 wt.%) indicating a diminish in the hydrophobicity degree of the membranes. Apparently, the increase in the amount of nanopores near to the surface decreased the membrane roughness becoming less hydrophobic.

Subject Areas

membrane distillation; polyvinylidene fluoride; copper oxide nanoparticles; membrane morphology

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