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

*Corresponding author

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

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.

Original languageEnglish
Article number1368
JournalNanomaterials
Volume9
Issue number10
Number of pages12
ISSN2079-4991
DOIs
Publication statusPublished - 24 Sep 2019

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Nanofiltration membranes
Aluminum Oxide
Surface-Active Agents
Silicon Dioxide
Purification
Surface active agents
Alumina
Silica
Aluminum
Membranes
Fabrication
Water
Caffeine
Organic pollutants
Sol-gel process
Reaction rates
Effluents
Wastewater
Salts
Doping (additives)

Keywords

  • sol-gel
  • selectivity
  • desalination
  • depollution
  • wastewater

Cite this

@article{60da846e63954873bea99ef833531233,
title = "Surfactant-assisted Fabrication of Alumina-doped Amorphous Silica Nanofiltration Membranes with Enhanced Water Purification Performances",
abstract = "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.",
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Surfactant-assisted Fabrication of Alumina-doped Amorphous Silica Nanofiltration Membranes with Enhanced Water Purification Performances. / Ma, Xianzheng; Janowska, Katarzyna Joanna; Boffa, Vittorio; Fabbri, Debora; Magnacca, Giuliana; Calza, Paola; Yue, Yuanzheng.

In: Nanomaterials, Vol. 9, No. 10, 1368, 24.09.2019.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Surfactant-assisted Fabrication of Alumina-doped Amorphous Silica Nanofiltration Membranes with Enhanced Water Purification Performances

AU - Ma, Xianzheng

AU - Janowska, Katarzyna Joanna

AU - Boffa, Vittorio

AU - Fabbri, Debora

AU - Magnacca, Giuliana

AU - Calza, Paola

AU - Yue, Yuanzheng

PY - 2019/9/24

Y1 - 2019/9/24

N2 - 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.

AB - 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.

KW - sol-gel

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