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
复制标题
DOI：
10.1021/cm0202355
复制
发表时间：
2002-11-01
影响因子：
8.6
通讯作者：
Tatsumi, T
中科院分区：
文献类型：
--
作者：
Yoshitake, H;Yokoi, T;Tatsumi, T
我们报道了氨基硅烷接枝介孔二氧化硅在酸性条件下作为氧阴离子吸附剂的特性。制备了单、二、三氨基功能化二氧化硅，考察了氨基密度的影响。三胺硅烷接枝介孔二氧化硅吸附的铬酸盐和砷酸盐比预期的多，表明络合物形成稳定。功能化SBA-1比MCM-41衍生物具有更大的吸附能力。吸附量与单胺基的平均表面密度无关，表明固定硅烷的结构域形成。这些分子和介观尺度上的结构特征可能为理解氨基功能化固体捕获非均相氧阴离子的机制提供了新的思路，氨基功能化固体是减少有毒阴离子污染的有前途的廉价试剂。
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.