Tailoring the Hydrophobic Character of Mesoporous Silica by Silylation for VOC Removal

被引：40

作者：

Batonneau-Gener, Isabelle ^{[1
]}

Yonli, Arsene

Trouve, Adeline

Mignard, Samuel

Guidotti, Matteo ^{[2
]}

Sgobba, Maila ^{[2
]}

机构：

[1] Catalyse Chim Organ Lab, UMR6503, F-86022 Poitiers, France

[2] Univ Milan, CNR, Dept Inorgan Chem, Milan, Italy

来源：

SEPARATION SCIENCE AND TECHNOLOGY | 2010年 / 45卷 / 06期

关键词：

adsorption; hydrophobicity; MCM-41; mesoporous silica; silylation; MOLECULAR-SIEVES; SILAZANE-SILYLATION; SURFACE-CHEMISTRY; WATER SORPTION; MCM-41; ADSORPTION; ZEOLITE; ADSORBENTS; FUNCTIONALIZATION; STABILIZATION;

D O I：

10.1080/01496391003609155

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

MCM-41 and non-ordered mesoporous silica were modified using hexamethyl-disilazane (HMDS). The hydrophobic and hydrophilic properties of grafted materials were studied and compared to a purely all silica BEA zeolite by using competitive and noncompetitive water toluene adsorption. A linear correlation between the silylation degree and the hydrophobicity measurements has been found for MCM-41 materials. Even if highly silylated MCM-41 material have more hydrophilic sites (silanol groups) than all silica zeolite, water molecule condensation is not observed because these sites are isolated. Thus, the highly silylated MCM-41 sample exhibits not only hydrophobicity 2.3 times higher than all silica BEA zeolite but also possesses a storage capacity for toluene and chlorobenzene 3 times higher than this zeolite. In competition with water, the organic molecule (toluene or chlorobenzene) adsorption is always favored even if water adsorption is enhanced by chlorobenzene polarity.

引用

页码：768 / 775

页数：8

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