TY - JOUR
T1 - Modeling the primary size effects of citrate-coated silver nanoparticles on their ion release kinetics
AU - Zhang, Wen
AU - Yao, Ying
AU - Sullivan, Nicole
AU - Chen, Yongsheng
PY - 2011/5/15
Y1 - 2011/5/15
N2 - Ion release is an important environmental behavior of silver nanoparticles (AgNPs), and characterization of Ag+ release is critical for understanding the environmental fate, transport, and biological impacts of AgNPs. The ion release kinetics of AgNPs with three primary diameters (20, 40, and 80 nm) were studied by dispersing them in quarter-strength Hoagland medium at two initial concentrations (300 and 600 μg/L). Ag+ release rates were found to depend on primary particle size and concentration, when other environmental factors (e.g., dissolved oxygen and protons) were kept constant. A kinetic model was developed to describe the Ag+ release based on the hard sphere theory using the Arrhenius equation. The model fitted the experimental data well with correlation coefficients of 0.97-0.99, and the model usefully interpreted the dependence of ion release kinetics on the primary particle size and concentration. Moreover, the effects of environmental factors (e.g., dissolved oxygen, pH, temperature, and salinity) potentially can be interpreted as well. This model provides fundamental insight into the ion release kinetics of AgNPs in aqueous environments, allowing us to better understand and predict the nanotoxicity of AgNPs.
AB - Ion release is an important environmental behavior of silver nanoparticles (AgNPs), and characterization of Ag+ release is critical for understanding the environmental fate, transport, and biological impacts of AgNPs. The ion release kinetics of AgNPs with three primary diameters (20, 40, and 80 nm) were studied by dispersing them in quarter-strength Hoagland medium at two initial concentrations (300 and 600 μg/L). Ag+ release rates were found to depend on primary particle size and concentration, when other environmental factors (e.g., dissolved oxygen and protons) were kept constant. A kinetic model was developed to describe the Ag+ release based on the hard sphere theory using the Arrhenius equation. The model fitted the experimental data well with correlation coefficients of 0.97-0.99, and the model usefully interpreted the dependence of ion release kinetics on the primary particle size and concentration. Moreover, the effects of environmental factors (e.g., dissolved oxygen, pH, temperature, and salinity) potentially can be interpreted as well. This model provides fundamental insight into the ion release kinetics of AgNPs in aqueous environments, allowing us to better understand and predict the nanotoxicity of AgNPs.
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U2 - 10.1021/es104205a
DO - 10.1021/es104205a
M3 - Article
C2 - 21513312
AN - SCOPUS:79956004155
VL - 45
SP - 4422
EP - 4428
JO - Environmental Science & Technology
JF - Environmental Science & Technology
SN - 0013-936X
IS - 10
ER -