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 to the author of the doctoral dissertation which made the greatest contribution to advancing the field of soil science in a given year.
The first of Dr. Ferreira's current research projects intends to find an effective remediation strategy for radiocesium contaminated soil in Fukushima Prefecture in Japan. The deposition of radiocesium following the Fukushima Daiichi Nuclear Power Plant meltdown in 2011 has created an enormous amount of contaminated soil for which the Japanese government still does not have an effective long term solution. Dr. Ferreira intends to use his knowledge of soil science and chemistry to solve this problem and determine a safe, effective mechanism for extracting radiocesium from the soil in order to facilitate its re-use or disposal. Dr. Ferreira has traveled to Japan twice, once with his graduate student, to conduct research with a colleague at Meiji University, just outside of Tokyo. Below you can see pictures of Dr. Ferreira and his graduate student James Thornhill collecting soil samples in Iitate Village, a farming village in Fukushima Prefecture, and performing a chemical extraction on those soil samples at Meiji University.
Dr. Ferreira's other research project involves determining the impact of soil physical and chemical properties on the retention of microplastics through soil. Dr. Ferreira is part of an interdisciplinary research team that received a $75,000 grant in 2020 to perform research on the fate and transport of microplastics in the environment. While a significant amount of research has been performed on microplastics in the marine environment, much less is known about how microplastics move through the terrestrial environment. Since microplastics are routinely released into the environment from places like wastewater treatment plants, understanding how those microplastics interact with the soil is very important. Dr. Ferreira plans to conduct a series of column studies in the summer of 2021 to better understand how microplastics move through the soil environment.
D.R. Ferreira, B. Baruah, G.D. Phillips, K. Noborio, V. Romero, Y. Sunikawa. 2021. Chemical Extraction of Non-Exchangeable Cs from Fukushima Prefecture Soil Using Ion-Exchange and Selective Precipitation. In Preparation.
B.Baruah, G.D. Phillips, and D.R. Ferreira. 2022. Comparing Cs+ Binding Affinity of Keggin Type Polyoxometalate and Sodium Tetrakis(4-florophenyl)borate in Solution and from Cs-doped Pure Phase Vermiculite. Journal of Environmental Radioactivity. Under review.
D.R. Ferreira, G.D. Phillips, B. Baruah. 2021. A Comparison of the Adsorption of Cesium on Zeolite Minerals Vs. Vermiculite. Clays and Clay Minerals. DOI:10.1007/s42860-021-00150-9
R.S. Walker, D.R. Ferreira, and G. Taasoobshirazi. 2019. The Effect of Statement Biased Popular Media Consumption on Public Perceptions of Nuclear Power. Journal of Emerging Investigators, 2, 1-8
Ferreira, D. R., J. A. Thornhill, E. I. N. Roderick, and Y. Li. 2018. The Impact of pH and Ion Exchange on 133Cs Adsorption on Vermiculite. J. Environ. Qual. 0. doi:10.2134/jeq2018.01.0043
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.