Synthesis and hydrophobic adsorption properties of microporous/mesoporous hybrid materials
Date
2009
Authors
Hu, Q.
Li, J.
Qiao, S.
Hao, Z.
Tian, H.
Ma, C.
He, C.
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Journal article
Citation
Journal of Hazardous Materials, 2009; 164(2-3):1205-1212
Statement of Responsibility
Qin Hu, Jinjun Li, Shizhang Qiao, Zhengping Hao, Hua Tian, Chunyan Ma, Chi He
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Abstract
Hybrid materials of silicalite-1 (Sil-1)-coated SBA-15 particles (MSs) have been successfully synthesized by crystallization process under hydrothermal conditions. These MSs materials were characterized by X-ray diffraction, nitrogen adsorption/desorption and TEM techniques, which illustrated that the silicalite-1-coated SBA-15 particles were successfully prepared and had large pore volume and hierarchical pore size distribution. Further experimental studies indicated that longer crystallization time under basic condition caused the mesostructure of SBA-15 materials to collapse destructively and higher calcination temperature tended to disrupt the long-range mesoscopic order while they had little influence on the phase of microcrystalline silicalite-1 zeolite. The resultant MSs materials were investigated by estimating dynamic adsorption capacity under dry and wet conditions to evaluate their adsorptive and hydrophobic properties. The hydrophobicity index (HI) value followed the sequence of silicalite-1>MSs>SBA-15, which revealed that the SBA-15 particles coated with the silicalite-1 seeds enhanced the surface hydrophobicity, and also were consistent with FTIR results. Our studies show that MSs materials combined the advantages of the ordered mesoporous material (high adsorptive capacity, large pore volume) and silicalite-1 zeolite (super-hydrophobic property, high hydrothermal stability), and the presence of micropores directly led to an increase in the dynamic adsorption capacity of benzene under dry and wet conditions.
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Copyright © 2008 Elsevier B.V. All rights reserved.