NDLI: Effects of Humic Acid and Solution Chemistry on the Retention and Transport of Cerium Dioxide Nanoparticles in Saturated Porous Media

Content Provider	Springer Nature Link
Author	Lv, Xueyan Gao, Bin Sun, Yuanyuan Shi, Xiaoqing Xu, Hongxia Wu, Jichun
Copyright Year	2014
Abstract	When released into natural aquatic systems, cerium oxide (CeO$_{2}$) nanoparticles (NPs) may have toxic effects to the ecosystems and public health; it is thus important to understand their environmental fate and transport. This work studied the effects of humic acid (HA) concentrations (0–10 mg L$^{−1}$) and solution chemistry (ionic strength (IS) and pH) on the retention and transport of CeO$_{2}$ NPs in water-saturated porous media under environmental relevant conditions. HA and IS showed remarkable effect on the retention and transport of CeO$_{2}$ NPs in the porous media. Even at low concentrations (i.e., 5 and 10 mg L$^{−1}$), HA stabilized CeO$_{2}$ NPs in the suspensions by introducing both negative surface charge and steric repulsion and thus enhanced their mobility in the porous media. When solution HA concentration increased or ionic strength decreased, mobility of CeO$_{2}$ NPs in the porous media enhanced dramatically. Solution pH, however, had little influence on the mobility of the CeO$_{2}$ NPs under the tested experimental conditions, and increasing solution pH only slightly increased the transport of the NPs. Mathematical models were applied to describe the experimental data. Predictions from the extended Derjaguin–Landau–Verwey–Overbeek (XDLVO) theory and advection–dispersion–reaction (ADR) model matched the experimental data well.
Starting Page	1
Ending Page	9
Page Count	9
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	225
Issue Number	10
e-ISSN	15732932
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-09-26
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cerium oxide Engineered nanoparticles Solution chemistry Humic acid Transport Model 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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