Kinetics of Cd(ii) adsorption and desorption on ferrihydrite: experiments and modeling

Environmental Science. Processes & Impacts
Yuzhen LiangZhenqing Shi

Abstract

The kinetics of Cd(ii) adsorption/desorption on ferrihydrite is an important process affecting the fate, transport, and bioavailability of Cd(ii) in the environment, which was rarely systematically studied and understood at quantitative levels. In this work, a combination of stirred-flow kinetic experiments, batch adsorption equilibrium experiments, high-resolution transmission electron microscopy (HR-TEM), and mechanistic kinetic modeling were used to study the kinetic behaviors of Cd(ii) adsorption/desorption on ferrihydrite. HR-TEM images showed the open, loose, and sponge-like structure of ferrihydrite. The batch adsorption equilibrium experiments revealed that higher pH and initial metal concentration increased Cd(ii) adsorption on ferrihydrite. The stirred-flow kinetic results demonstrated the increased adsorption rate and capacity as a result of the increased pH, influent concentration, and ferrihydrite concentration. The mechanistic kinetic model successfully described the kinetic behaviors of Cd(ii) during the adsorption and desorption stages under various chemistry conditions. The model calculations showed that the adsorption rate coefficients varied as a function of solution chemistry, and the relative contributions ...Continue Reading

References

Nov 10, 1996·Journal of Colloid and Interface Science·P Venema van Riemsdijk WH
Mar 31, 1999·Proceedings of the National Academy of Sciences of the United States of America·G E BrownJ D Ostergren
Apr 12, 2005·Environmental Science & Technology·H ErnstbergerW Davison
Sep 11, 2009·Journal of Colloid and Interface Science·Melinda S SchallerChristopher J Landry
Mar 20, 2016·Journal of Colloid and Interface Science·Charlotta Tiberg, Jon Petter Gustafsson

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