Abstract
The rapid increase in the use of engineered nanoparticles [ENPs] has resulted in an increasing concern over the potential impacts of ENPs on the environmental and human health. ENPs tend to adsorb a large variety of toxic chemicals when they are emitted into the environment, which may enhance the toxicity of ENPs and/or adsorbed chemicals. The study was aimed to investigate the adsorption and desorption behaviors of arsenic on ceria NPs in aqueous solution using batch technique. Results show that the adsorption behavior of arsenic on ceria NPs was strongly dependent on pH and independent of ionic strength, indicating that the electrostatic effect on the adsorption of these elements was relatively not important compared to surface chemical reactions. The adsorption isotherms fitted very well to both the Langmuir and Freundlich models. The thermodynamic parameters (ΔH0, ΔS0, and ΔG0) for the adsorption of arsenic were determined at three different temperatures of 283, 303, and 323 K. The adsorption reaction was endothermic, and the process of adsorption was favored at high temperature. The desorption data showed that desorption hysteresis occurred at the initial concentration studied. High adsorption capacity of arsenic on ceria NPs suggests that the synergistic effects of ceria NPs and arsenic on the environmental systems may exist when they are released into the environment.
Highlights
With the large-scale production and widespread application, the potential environmental risks of engineered nanoparticles [NPs] have attracted much attention since NPs will be unavoidably released to the environment after their production, use, and disposal
BET analysis demonstrated that the ceria NPs had high specific surface areas which were about 86.85 m2 g-1
The results indicated that the adsorption of arsenic onto ceria NPs was favored at high temperature and was blocked at low temperature
Summary
With the large-scale production and widespread application, the potential environmental risks of engineered nanoparticles [NPs] have attracted much attention since NPs will be unavoidably released to the environment after their production, use, and disposal. Previous studies have demonstrated that ceria NPs have toxic effects on cells [11,12], aquatic organisms [13,14], and plants [15]; other reports show that ceria NPs are able to rescue HT22 cells from oxidative stress-induced cell death [16] and protect against the progression of cardiac dysfunction [17]. These contradictory results suggest the complex behaviors of ceria NPs in the environment
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