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Utilization of rice husk silica as adsorbent for BTEX passive air sampler under high humidity condition

Areerob, Thanita, Grisdanurak, Nurak, Chiarakorn, Siriluk
Environmental science and pollution research international 2016 v.23 no.6 pp. 5538-5548
BTEX (benzene, toluene, ethylbenzene, xylene), Fourier transform infrared spectroscopy, X-ray diffraction, adsorbents, adsorption, air, benzene, ethylbenzene, porous media, relative humidity, rice hulls, silica, soot, surface area, toluene, xylene
Selective adsorbent of benzene, toluene, ethylbenzene, and xylenes (BTEX) was developed based on mesoporous silica materials, RH-MCM-41. It was synthesized from rice husk silica and modified by silane reagents. The silane reagents used in this study were trimethylchlorosilane (TMS), triisopropylchlorosilane (TIPS), and phenyldimethylchlorosilane (PDMS). Physiochemical properties of synthesized materials were characterized by small-angle X-ray diffraction (XRD), Fourier-transformed infrared spectroscopy (FTIR), and surface area analysis. Materials packed in passive air sampler were tested for BTEX uptake capacity. The tests were carried out under an influence of relative humidity (25 to 99 %). Overall, RH-MCM-41 modified by TMS outperformed compared to those modified by other silane agents. The comparative BTEX adsorption on this material and commercial graphitized carbon black was reported.