Nanoparticless in Environment:Formation, Fate, and Toxicity
报告题目：Nanoparticless in Environment:Formation, Fate, and Toxicity
系列：“生态与环境讲坛”系列第 175 讲
报告人：Prof. Virender K. Sharma
摘要：Nanoparticles (NPs) are present in almost all spheres of environment (river, wastewater effluents, hydrothermal vents, rocks, ores, and atmosphere). The presentation will demonstrate the examples of natural existence of metal nanoparticles and their oxides/sulfides forms in atmosphere, waters, wastewaters, ore deposits, mining regions, and hydrothermal vents. The formation of silver and gold nanoparticles (AgNPs and AuNPs), pyrite (FeS2), and Ag2S, under environmental conditions (temperature, pH, oxic/anoxic, light, and concentration and characteristics of natural organic matter, fulvic acid, and humic acid) will be discussed din detail. The presentation will give pathways of mechanisms that contribute to the natural existence of AgNPs and AuNPs. Reactive oxygen species and redox properties of natural organic matter are involved in formation of AgNPs and AuNPs. Effect of pH, temperature, and light as well as concentrations of redox metals (e.g., Fe(II)/Fe(III)) on the formation of AgNPs and AuNPs will be summarized.
简介：Virender K. Sharma received his Ph.D. from Rosenstiel School of Marine and Atmospheric Science, University of Miami, Florida. His postdoctoral work was at Brookhaven National Laboratory and the State University of New York, Buffalo, New York. He is currently a Professor in the Department of Environmental and Occupational Health, School of Public Health (SPH), Texas A&M University. He is also serving as the Director of the Program of Environment and Sustainability of the SPH. Dr. Sharma has made seminal contributions in the areas of chemistry and environmental applications of ferrates. Dr. Sharma has also made key contributions in understanding the fate and toxicity of natural nanoparticles in an aquatic environments, resulting in an impact on human and ecological health. His research has produced more than 260 peer-reviewed publications (journals include Environmental Science & Technology, Water Research, Geochim Cosmochim Acta, Accounts of Chemical Research, and Chemical Society Reviews) with more than 13,000- citations with an h-index of 55 (Source: Google Scholar). Dr. Sharma has also published 52 book chapters, 36 proceedings, and authored and edited seven books. His distinguish awards include Faculty Excellence in Research by Florida Tech, Outstanding Chemist by the American Chemical Society (Orlando Section), Certificate of Merit Award for Ferrate and Nanoparticle Research presentations by the Environmental Chemistry Division of the American Chemical Society, and Excellence in Review by Environmental Science & Technology.