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Published on: June 28, 2019
A sorption kinetics model for arsenic adsorption to magnetite nanoparticles
Heather J Shipley1, Sujin Yean, Amy T Kan
1University of Texas-San Antonio, One UTSA Circle, San Antonio, TX 78249, USA. heather.shipley@utsa.edu
Introduction:
Arsenic is a well known water contaminant that causes toxicological and carcinogenic effects. In this work magnetite nanoparticles were examined as possible arsenic sorbents. The objective of this work was to develop a sorption kinetics model, which could be used to predict the amount of arsenic adsorbed by magnetite nanoparticles in the presence of naturally occurring species using a first-order rate equation, modified to include adsorption, described by a Langmuir isotherm.
Discussion:
Arsenate and arsenite adsorption to magnetite nanoparticles was studied, including the effect of naturally occurring species (sulfate, silica, calcium magnesium, dissolved organic matter, bicarbonate, iron, and phosphate) on adsorption.
Conclusion:
The model accurately predicts adsorption to magnetite nanoparticles used in a batch process to remove arsenic from spiked Houston, TX tap water, and contaminated Brownsville, TX groundwater.
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