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Removal of Trichloroethylene by Activated Carbon in the Presence and Absence of TiO2 Nanoparticles
Citation:
Salih, H. H., G. A. Sorial, C. L. PATTERSON, R. Sinha, AND R. Krishnan. Removal of Trichloroethylene by Activated Carbon in the Presence and Absence of TiO2 Nanoparticles. WATER, AIR, & SOIL POLLUTION. Springer, New York, NY, 223(5):2837-2847, (2012).
Impact/Purpose:
To inform the public
Description:
Nanoparticles (NPs) are emerging as a new type of contaminant in water and wastewater. The fate of titanium dioxide nanoparticles (TiO2NPs) in a granular activated carbon (GAC) adsorber and their impact on the removal of trichloroethylene (TCE) by GAC was investigated. Key parameters governing the TiO2NP-GAC interaction such as specific surface area (SSA); zeta potential and the TiO2NP particle size distribution (PSD) were determined. The impact of TiO2NPs on TCE adsorption on GAC was tested by conducting TCE adsorption isotherms, kinetics and column breakthrough studies in the presence and absence of TiO2NPs. SSA and pore size distribution of the virgin and the spent GAC were obtained. The fate and transport of the TiO2NPs in the GAC fixed bed and their impact on TCE adsorption were found to be a function of their zeta potential, concentration, PSD, and the nature of their aggregation. The TiO2NPs under investigation are not stable in water and rapidly form larger aggregates. Due to the fast adsorption kinetics of TCE, isotherm and the kinetic studies found no effect from simultaneous adsorption with TiO2NPs. However, TiO2NPs preloaded on GAC and led to a reduction in the amount of TCE adsorbed during the breakthrough experiments suggesting a preloading pore blockage phenomenon. The analysis of the spent GAC confirmed the pore blockage and SSA reduction.
