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

Environ Sci Pollut Res Int. 2016 Mar;23(6):5538-48. doi: 10.1007/s11356-015-5768-9. Epub 2015 Nov 14.

Abstract

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.

Keywords: BTEX; Humidity; Passive air sample; Rice husk.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adsorption
  • Air Pollutants / analysis*
  • Benzene / analysis
  • Benzene Derivatives / analysis
  • Environmental Monitoring / methods*
  • Humidity
  • Oryza / chemistry*
  • Silanes
  • Silicon Dioxide / chemistry*
  • Toluene / analysis
  • Xylenes / analysis

Substances

  • Air Pollutants
  • Benzene Derivatives
  • MCM-41
  • Silanes
  • Xylenes
  • Toluene
  • Silicon Dioxide
  • chlorodimethylphenylsilane
  • Benzene
  • ethylbenzene