Improvement of BTEX adsorption using silylated RH-MCM-41 synthesized from rice husk silica

Conference proceedings article

Authors/Editors

SIRILUK CHIARAKORN

Strategic Research Themes

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Publication Details

Author list: Areerob T., Grisdanurak N., Chiarakorn S.

Publisher: Trans Tech Publications

Publication year: 2012

Volume number: 700

Start page: 231

End page: 235

Number of pages: 5

ISBN: 9783037852637

ISSN: 0255-5476

eISSN: 1662-9752

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-80054003641&doi=10.4028%2fwww.scientific.net%2fMSF.700.231&partnerID=40&md5=53e2fc68fcb1298677680ac7959f3414

Languages: English-Great Britain (EN-GB)

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Abstract

RH-MCM-41, a mesoporous molecular sieve, was successfully synthesized from silica extracted from rice husk. The presence of silanol functional group (Si-OH) on its surface causes adverse effects on the adsorption of some non-polar compounds, especially benzene, toluene, ethylbenzene and xylene (BTEX). Thus, this work aims to enhance the adsorbability of RH-MCM-41 on BTEX adsorption by in-situ and ex-situ silylation. Trimethylchlorosilane (TMCS) was used as a silylating reagent to reduce silanol groups. The ex-situ silylation was carried out by adding as-synthesized RH-MCM-41 into 5% v/v of TMCS solution at 30?C and stirring for 24 h. While the in-situ silylated sample was prepared by mixing 5% v/v of TMCS solution and RH-MCM-41 precursor solution at 80ฐC and stirring for 120 h. The adsorption capacity of gaseous BTEX using the silylated RH-MCM-41 was determined by gas chromatography equipped with a flame ionization detector (GC-FID) with a thermal desorption unit (TDU). The adsorption capacities of the ex-situ samples were 0.617 mg g -1 for benzene, 1.271 mg g -1 for toluene, 1.902 mg g -1 for ethylbenzene and 0.036 mg g -1 of xylene, higher than that of the in-situ and the unsilylated samples. Thus, the ex-situ silylation is suitable for enhancement of hydrophobicity of RH-MCM-41. The ex-situ silylated RH-MCM-41 has the potential to be applied in gaseous BTEX treatment. ฉ (2012) Trans Tech Publications, Switzerland.

Keywords

BTEX adsorption, RH-MCM-41, Silylation