Surfactant-assisted Fabrication of Alumina-doped Amorphous Silica Nanofiltration Membranes with Enhanced Water Purification Performances

Xianzheng Ma, Katarzyna Joanna Janowska, Vittorio Boffa*, Debora Fabbri, Giuliana Magnacca, Paola Calza, Yuanzheng Yue

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Abstrakt

Surfactant-templated 5 mol% Al 2O 3-doped silica membranes nanofiltration membranes were synthesized via the sol-gel method, and afterward, were optimized, and tested with respect to the permeability and rejection rate. The disordered silica network was stabilized by doping 5 mol% alumina. Tetraethyl orthosilicate and aluminum isopropoxide were used as the silica and alumina precursors, respectively. Cetyltrimethylammonium bromide (CTAB) was used not only as a pore-forming agent, but also to control the reaction rate of the aluminum isopropoxide, thus obtaining highly homogeneous materials. The results about filtration of model solutions showed that the optimized membranes are featured by both a relatively high water permeability (1.1-2.3 L·m -2·h -1 ·bar -1) and a high rejection for salts (74% for NaCl, and >95% for MgSO 4 and Na 2SO 4) and organic pollutants (e.g., about 98% for caffeine). High rejection of divalent ions and organic molecules was also observed when a real wastewater effluent was filtered. The influence of the synthesis conditions on the membrane performance is discussed.

OriginalsprogEngelsk
Artikelnummer1368
TidsskriftNanomaterials
Vol/bind9
Udgave nummer10
Antal sider12
ISSN2079-4991
DOI
StatusUdgivet - 24 sep. 2019

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