The fate and transport of the SiO2 nanoparticles in a granular activated carbon bed and their impact on the removal of VOCs

Hafiz H. Salih, Craig L. Patterson, George A. Sorial, Rajib Sinha, Radha Krishnan

Research output: Contribution to journalArticlepeer-review

Abstract

Adsorption isotherm, adsorption kinetics and column breakthrough experiments evaluating trichloroethylene (TCE) adsorption onto granular activated carbon (GAC) were conducted in the presence and absence of silica nanoparticles (SiO2 NPs). Zeta potentials of the SiO2 NPs and the GAC were measured. Particle size distribution (PSD) of SiO2 NPs dispersions was analyzed with time to evaluate the extent of aggregation. TEM analysis was conducted. The specific surface area and the pore size distribution of the virgin and the spent GAC were obtained. The fate and transport of the SiO2 NPs in the GAC fixed bed and their impact on TCE adsorption were found to be a function of their zeta potential, concentration and PSD. The interaction of the SiO2 NPs and the GAC is of an electrokinetic nature. A weak electrostatic attraction was observed between the SiO2 NPs and the GAC. This attraction favors SiO2 NPs attachment on the surface of GAC. SiO2 NPs attachment onto GAC is manifested by a reduction in the amount of TCE adsorbed during the column breakthrough experiments suggesting a preloading pore blockage phenomenon. However, no effect of SiO2 NPs was observed on the isotherm and the kinetic studies, this is mainly due to the fast kinetics of TCE adsorption.

Original languageEnglish (US)
Pages (from-to)95-101
Number of pages7
JournalJournal of Hazardous Materials
Volume193
DOIs
StatePublished - Oct 15 2011
Externally publishedYes

Keywords

  • Activated carbon
  • Adsorption
  • Nanoparticles
  • SiO NPs
  • Trichloroethylene (TCE)

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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