NDLI: The Implications of Fe$_{2}$O$_{3}$ and TiO$_{2}$ Nanoparticles on the Removal of Trichloroethylene by Activated Carbon in the Presence and Absence of Humic Acid

Content Provider	Springer Nature Link
Author	Salih, Hafiz H. Sorial, George A. Patterson, Craig L. Speth, Thomas F.
Copyright Year	2015
Abstract	The impact of Fe$_{2}$O$_{3}$ and TiO$_{2}$ nanoparticles (NPs) on the removal of trichloroethylene (TCE) in a granular activated carbon (GAC)-fixed bed adsorber was investigated in the presence of humic acid (HA). The surface charges of GAC and NPs were obtained in the presence and absence of HA with the NPs behaving similarly. Isotherm and column studies were conducted in the presence and absence of the NPs and HA. NPs had no effect on TCE adsorption during isotherm studies. However, in the column studies conducted with organic-free water, the presence of NPs resulted in a reduction in TCE capacity most likely due to pore blockage by aggregating NPs. This effect was completely mitigated in the presence of HAs that prevented an association between the GAC and the NPs, and between NPs. The presence of HA provided a high negative charge on the GAC and on the nanoparticles resulting in repulsive forces between the GAC and the NPs, and between NPs, thereby preventing pore blockage. Both Fe$_{2}$O$_{3}$ and TiO$_{2}$ NPs demonstrated that charge characteristics are more important than chemical characteristics. Pore-size distribution of the fresh and the spent GAC confirmed the adsorption data but points to some HA and NP interaction with the carbon.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	226
Issue Number	2
e-ISSN	15732932
Language	English
Publisher	Springer International Publishing
Publisher Date	2015-02-01
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Adsorption Granular activated carbon (GAC) Humic acid Nanoparticles Trichloroethylene Environment Water Quality/Water Pollution Atmospheric Protection/Air Quality Control/Air Pollution Soil Science & Conservation Hydrogeology Climate Change/Climate Change Impacts
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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