Synthesis of ordered mesoporous silica membranes containing iron oxide nanocrystallites

Jiansheng Li, Xiaotong Wei, Jerry Lin, Dong Su

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

This paper reports the first effort in synthesis of iron-containing ordered mesoporous silica membrane on porous α-alumina support by a dip-coating process. A pure silica sol and a series of iron-containing silica sol with Fe/Si molar ratio of 0.1, 0.2 and 0.3 were prepared using Pluronic P123 as template, tetraethylorthosilicate as silica source and hydrated iron nitrite as precursor under acid condition. The unsupported membranes were characterized by Fourier transform infra-red (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM) and nitrogen isothermal adsorption measurement. Characterization revealed that iron species present as highly dispersed γ-Fe2O3 nanocrystals in hexagonal walls for higher iron-containing samples (Fe/Si = 0.2, 0.3). All unsupported membranes maintain ordered mesoporous structure similar to SBA-15 and possess high surface area, large pore volume and uniform pore size. Introduction of iron to silica matrix can decrease pore diameter and increase the wall thickness of mesopores. Scanning electron microscopy (SEM) studies show that the prepared supported membrane is defect-free and energy-dispersive spectroscopy (EDS) analysis further confirm the formation of continuous mesoporous layer on α-alumina porous support. The gas permeance results indicate the supported membranes exhibit Knudsen diffusion behavior confirming the good quality of the membrane.

Original languageEnglish (US)
Pages (from-to)186-192
Number of pages7
JournalJournal of Membrane Science
Volume312
Issue number1-2
DOIs
StatePublished - Apr 1 2008

Keywords

  • Gas permeation
  • Iron oxide
  • Membrane synthesis
  • Ordered mesoporous membranes
  • Silica

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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