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

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. Pa...

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Bibliographic Details
Published in:Journal of hazardous materials 2011-10, Vol.193, p.95-101
Main Authors: Salih, Hafiz H, Patterson, Craig L, Sorial, George A, Sinha, Rajib, Krishnan, Radha
Format: Article
Language:English
Subjects:
Activated carbon
Adsorption
Applied sciences
Atmospheric pollution
Attachment
Attraction
Carbon - chemistry
Chemical engineering
Decontamination. Miscellaneous
dispersions
electrostatic interactions
Exact sciences and technology
Isotherms
Microscopy, Electron, Scanning
Nanoparticles
particle size distribution
Pollution
silica
Silicon dioxide
Silicon Dioxide - chemistry
Soil and sediments pollution
sorption isotherms
surface area
Surface chemistry
transmission electron microscopy
trichloroethylene
volatile organic compounds
Volatile Organic Compounds - isolation & purification
Zeta potential
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Summary: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.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2011.07.030