Adsorption of chromate and arsenate by amino-functionalized MCM-41 and SBA-1

被引：365

作者：

Yoshitake, H

Yokoi, T

Tatsumi, T

机构：

[1] Yokohama Natl Univ, Grad Sch Environm & Informat Sci, Hodogaya Ku, Yokohama, Kanagawa 2408501, Japan

[2] Yokohama Natl Univ, Grad Sch Engn, Div Sci Mat, Hodogaya Ku, Yokohama, Kanagawa 2408501, Japan

来源：

CHEMISTRY OF MATERIALS | 2002年 / 14卷 / 11期

关键词：

D O I：

10.1021/cm0202355

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：4603 / 4610

页数：8

共 64 条

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