Dr. Ferreira is a soil chemist and investigates the behavior of ions at the mineral / water interface, especially in ion-exchange reactions. Ion exchange processes play a role in many important environmental soil functions such as the retention of nutrients and the fate and transport of pollutants in soil and ground water. By studying the competition between ions for adsorption sites on soil minerals, particularly clay minerals, Dr. Ferreira is better able to understand the nuances of the behavior of these ions in natural environments. Techniques used in this research may include adsorption envelopes, adsorption isotherms, calorimetry, x-ray diffraction, nuclear magnetic resonance spectroscopy, or electron paramagnetic resonance spectroscopy.
Dr. Ferreira's doctoral dissertation, The Nanopore Inner-Sphere (NISE) Effect and Its Role in Sodium Retention was selected for the 2013 Emil Truog Award. This award is given by the Soil Science Society of America for the doctoral dissertation which made the greatest contribution to advancing the field of soil science in a given year.
Dr. Ferreira's current research project intends to better understand the retention mechanisms of non-exchangeable cesium cations in clay minerals such as vermiculite and illite in order to potentially facilitate the remediation of radiocesium contaminated soils around the site of the Fukushima Daiichi nuclear disaster in Japan.
Ferreira, D.R., C.P. Schulthess, and N.J. Kabengi. 2013. Calorimetric Evidence in Support of the Nanopore Inner-Sphere Enhancement (NISE) Theory on Cation Adsorption. Soil Sci. Soc. Am. J., 77:94-99.
Ferreira, D.R., C.P. Schulthess, J.E. Amonette, and E.D. Walter. 2012. An Electron Paramagnetic Resonance Spectroscopy Investigation on the Retention Mechanisms of Divalent Cations in Zeolite Nanopores. Clay Clay Miner. 60 (6): 588-598.
Ferreira, D.R., C.P. Schulthess, and M.V. Giotto. 2012. An Investigation of Strong Sodium Retention Mechanisms in Nanopore Environments Using Nuclear Magnetic Resonance Spectroscopy. Environ. Sci. Technol., 46: 300-306.
Ferreira, D.R., and C.P. Schulthess. 2011. The Nanopore Inner-Sphere Enhancement (NISE) Effect: Sodium, Potassium, and Calcium. Soil Sci. Soc. Am. J. 75 (2): 389-396.
Schulthess, C.P., R.W. Taylor, and D.R. Ferreira. 2011. The Nanopore Inner-Sphere Enhancement (NISE) Effect: Sodium and Nickel. Soil Sci. Soc. Am. J. 75 (2): 378-388.
Chrysochoou, M., D.R. Ferreira, and C. Johnston. 2010. Calcium Polysulfide Treatment of Cr(VI)-Contaminated Soil. J. Hazard. Mater. 179: 650-657.