Health & Environmental Research Online (HERO)


Print Feedback Export to File
1002959 
Journal Article 
Tailoring the Hydrophobic Character of Mesoporous Silica by Silylation for VOC Removal 
Batonneau-Gener, I; Yonli, A; Trouve, A; Mignard, S; Guidotti, M; Sgobba, M 
2010 
1 
Separation Science and Technology
ISSN: 0149-6395
EISSN: 1520-5754 
45 
6 
768-775 
English 
WOS:000277727800006 
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. 
adsorption; hydrophobicity; MCM-41; mesoporous silica; silylation; CHEMISTRY, MULTIDISCIPLINARY; ENGINEERING, CHEMICAL