Organosilicas and organo-clay minerals as sorbents for toluene

Moaaz K. Seliem, Sridhar Komarneni, Yunchul Cho, Taesook Lim, M. G. Shahien, A. A. Khalil, I. M. Abd El-Gaid

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17 Scopus citations

Abstract

This study investigated the adsorption of toluene as a non-ionic organic contaminant by organosilicas and organo-clay minerals. Different organic surfactants were used to prepare a variety of MCM-41 molecular sieves at room temperature while cetyltrimethylammonium (CTMA) bromide was used to synthesize MCM-48 mesoporous material under hydrothermal conditions. Organo-clay minerals were synthesized under hydrothermal conditions using synthetic low-charge Na-fluorophlogopite micas with CTMA bromide as organic surfactant. All synthetic organosilicas and organo-clay minerals, the latter including those procured from two commercial sources were characterized by powder X-ray diffraction (XRD) and their toluene sorption properties were investigated. Among organosilicas, MCM-48 exhibited the highest distribution coefficient (Kd) value of toluene (95±9L/kg). An organo-clay mineral, Nanomer® PGW montmorillonite modified with CTMA bromide (Nanomer® 1.28E) showed the maximum Kd value (345±22L/kg) for toluene among all the studied organosilicas and organo-clay minerals. The organo-clay mineral nanocomposites were found to be superior to MCM-41 and MCM-48 organosilicas tested here and the former could find applications in remediating organic contaminants such as toluene from soil and groundwater.

Original languageEnglish (US)
Pages (from-to)184-189
Number of pages6
JournalApplied Clay Science
Volume52
Issue number1-2
DOIs
StatePublished - Apr 2011

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology

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