Adsorption of Chromate and Arsenate by Amino-Functionalized MCM-41 and SBA-1

Adsorption of Chromate and Arsenate by Amino-Functionalized MCM-41 and SBA-1

We report the characteristics of aminosilane-grafted mesoporous silicas as adsorbents of oxyanions in acidic conditions. Mono-, di-, and triamino-functionalized silicas were prepared to examine the influence of amino group density. The triaminosilane-grafted mesoporous silica adsorbed more chromate...

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Veröffentlicht in:Chemistry of materials 2002-11, Vol.14 (11), p.4603-4610
Hauptverfasser: Yoshitake, Hideaki, Yokoi, Toshiyuki, Tatsumi, Takashi
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Sprache:eng
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Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Porous materials
Solid-liquid interface
Surface physical chemistry
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container_title Chemistry of materials
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creator Yoshitake, Hideaki
Yokoi, Toshiyuki
Tatsumi, Takashi
description We report the characteristics of aminosilane-grafted mesoporous silicas as adsorbents of oxyanions in acidic conditions. Mono-, di-, and triamino-functionalized silicas were prepared to examine the influence of amino group density. The triaminosilane-grafted mesoporous silica adsorbed more chromate and arsenate than expected from the increased number of sites, suggesting stable complex formations. Functionalized SBA-1 showed larger adsorption capacities than MCM-41 derivatives. The adsorption capacity was independent of the average surface density of monoamino groups, demonstrating domain formation of fixed silanes. These structural characteristics on molecular and meso scales may offer insights into understanding the mechanism of heterogeneous oxyanion capture by amino-functionalized solids, which are promising inexpensive reagents for reducing toxic anion pollution.
doi_str_mv 10.1021/cm0202355
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subjects Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Porous materials
Solid-liquid interface
Surface physical chemistry
title Adsorption of Chromate and Arsenate by Amino-Functionalized MCM-41 and SBA-1
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