讲座题目: Redox Chemistry of Iron, Iron Oxides, and Iron Sulfides
主讲人: Prof. Paul Tratnyek
Abstract: Granular zerovalent iron (ZVI) has become the favorite model systems used in fundamental and applied studies of a wide variety of environmental redox processes. This has resulted in notable advances in many areas, including the kinetics and mechanisms of contaminant reduction reactions, theory of filtration and transport of colloids in porous media, and modeling of complex reactive-transport scenarios. Recently, studies of nano-sized ZVI have advanced the understanding of how coatings of organic polyelectrolytes—like natural organic matter (NOM)—influence the reactivity of environmental surfaces. Even more recently, ZVI-based systems have advanced our understanding of how incorporation of sulfur (i.e., sulfidation) alters the redox properties of iron and iron oxides. While many new studies still emphasize environmental engineering applications of ZVI, most of their long-term impact will come from the model system effect
Biographical Sketch: Dr. Paul G. Tratnyek is currently Professor in the School of Public Health at the Oregon Health & Science University (OHSU). Prof. Tratnyek’s research concerns the physico-chemical processes that control the fate and effects of environmental substances, including minerals, metals (for remediation), organics (as contaminants), and nanoparticles (for remediation, as contaminants, and in biomedical applications). His recent work on the structure and reactivity of Fe(0)-containing nanoparticles has helped to clarify the potential benefits and drawbacks of using reactive nanoparticles for environmental remediation. He currently serves as an Associate Editor of the journal of Environmental Sciences: Process and Impacts and an Editorial Advisory Board member for Environmental Science &Technology.
讲座题目: Renewable fuel and chemical production from waste organics and biomass: hydrothermal conversion pathways
主讲人: Prof. Timothy J. Strathmann
Abstract – With increasing global demands for low-cost and sustainable sources of clean water, energy, food, and materials, we are in the midst of a revolution in the way we approach wastewater treatment. The traditional risk mitigation-centric paradigm for wastewater management is being replaced by resource recovery-centric approaches that view wastewater as a valuable source of water, energy, and chemicals (so-called wastewater biorefineries or water resource recovery facilities). Meeting treatment goals while optimizing valorization of wastewater streams necessitates the integration of biological, physical, (thermo)chemical, and catalytic technologies, following approaches being developed for the nascent bio-economy. In this presentation, I will discuss recent collaborative work focusing on the application of integrated hydrothermal-catalytic technologies to recover energy, fertilizer, and high value chemical products from wet biosolids and waste materials (algal biomass from wastewater treatment, waste fats and grease, waste lignin streams). Opportunities and challenges for widespread adoption of these technologies will be discussed.
Biographical Sketch: Timothy Strathmann is currently a Professor in the Department Civil and Environmental Engineering at the Colorado School of Mines, and holds a collaborative research appointment at the National Renewable Energy Laboratory (NREL). From 2003 to 2014 he was on the faculty at the University of Illinois at Urbana-Champaign. His research focuses on the development sustainable catalytic technologies for water treatment and waste valorization, and the study of redox transformation mechanisms for contaminants of emerging concern (CEC). Dr. Strathmann is the recipient of a National Science Foundation CAREER Award, and currently serves as an Associate Editor for Environmental Science & Technology. Dr. Strathmann’s formal training includes a PhD in environmental engineering from Johns Hopkins, BS and MS degrees from Purdue, and postdoctoral training at Princeton.
讲座题目: The importance of polyfluorinated substances as contaminants at aqueous film-forming foam (AFFF) impacted sites
主讲人: Dr. Christopher P. Higgins
Biographical Sketch: Christopher P. Higgins is an environmental chemist at the Colorado School of Mines (CSM). Dr. Higgins’ received his A.B. in Chemistry from Harvard University, and graduate degrees in Civil and Environmental Engineering from Stanford University. He joined faculty at the CSM in 2009, and was promoted to Associate Professor in 2014. His research focuses on the movement of contaminants in the environment. In particular, he studies chemical fate and transport in natural and engineered systems as well as bioaccumulation in plants and animals, with a focus on poly- and perfluoroalkyl substances. Dr. Higgins has authored more than 60 peer-reviewed publications to date and his research has been supported by the National Science Foundation, the National Institutes of Health, the U.S. Environmental Protection Agency, the U.S. Department of Agriculture, the U.S. Air Force, and the U.S. Department of Defense’s Strategic Environmental Research and Development Program (SERDP) and Environmental Security Technology Certification Program (ESTCP).