Improvement of BTEX Adsorption Using Silylated RH-MCM-41 Synthesized from Rice Husk Silica

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 80°C 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.

• Periodical: Materials Science Forum (Volume 700)
• Pages: 231-235
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.700.231
• Online since: September 2011
• Authors: Thanita Areerob, Nurak Grisdanurak, Siriluk Chiarakorn
• Keywords: BTEX Adsorption, RH-MCM-41, Silylation

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DOI: 10.1016/j.micromeso.2005.01.012