Characterization of Mesoporous Silica and its Application as an Adsorbent for Benzene Sensing

Bralee Chayasombat; Pitchaya Muensri; Yoothapong Klinthongchai; Kroekchai Inpor; Onuma Santawitee; Helene Debeda; Chanchana Thanachayanont; Seeroong Prichanont

doi:10.4028/www.scientific.net/SSP.302.107

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HomeSolid State PhenomenaSolid State Phenomena Vol. 302Characterization of Mesoporous Silica and its...

Characterization of Mesoporous Silica and its Application as an Adsorbent for Benzene Sensing

Abstract:

Mesoporous silica (MPS) is a porous silica material with various pore structures. In this study, mesocellular foam silica (MCF) was synthesized and functionalized by hexamethyldisilazane (HMDS) to study effects of surface chemistry on benzene adsorption capability. Physical and chemical properties of pristine and functionalized MCFs were characterized and compared. Scanning and transmission electron microscopy showed that the complex pore structures of the MCFs were retained after the functionalization at relatively high temperature (573K). TGA and FTIR results showed that the functionalization led to a reduction of water adsorbed on the surfaces of the MCF. The functionalization improved adsorption of benzene compared to the pristine MCF and the optimum HMDS:SiO₂ molar ratio was 1.5. The amount of benzene adsorbed has a linear relationship with the concentration of benzene in the environment. This relationship enables quantitative benzene detection by using the functionalized MCF as sensing materials in resistive-type or gravimetric-type benzene gas sensors.

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Solid State Phenomena (Volume 302)

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107-113

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https://doi.org/10.4028/www.scientific.net/SSP.302.107

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April 2020

Authors:

Bralee Chayasombat*, Pitchaya Muensri, Yoothapong Klinthongchai, Kroekchai Inpor, Onuma Santawitee, Helene Debeda, Chanchana Thanachayanont, Seeroong Prichanont

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Benzene, Functionalization, Mesocellular Silica Foam, Sensing Material

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