报告人：Prof. Virender K. Sharma Texas A&M University
Iron-catalyzed oxidation of organic pollutants has key role in advanced oxidation processes (AOPs) to treat water and wastewater. In recent years, simple high-valent iron oxo compounds in aqueous solution have shown remarkable importance in sustainable green chemistry, in the oxidation of water to evolve oxygen, and in treating emerging pollutants in water. The focus of the present paper is to elucidate the oxidation properties of tetra-oxy-iron(VI) (FeVIO42-, FeVI), -iron(V) (FeVO43-, FeV), and -iron(IV) (FeIVO44-, FeIV) anions in water. These anions are commonly called ferrates and there is increasing interest in their applications in environmental-friendly treatment of contaminants in water (1). The most commonly used ferrate is FeVI, which is relatively stable and can be applied in real water treatment conditions. During FeVI oxidative treatment, the formation of intermediate species, FeV and FeIV, occur (2). For example, when FeVI oxidizes pollutant(X), it can decay by 1-electron transfer to FeV or by 2-electron transfer to FeIV. These intermediate iron species are highly reactive (i.e. more reactive than FeVI) and investigations on roles of FeV and FeIV in degrading pollutants in water are forthcoming. In the presentation, examples of the oxidation of antibiotics and inactivation of bacteria and virus will be given (3-5). The results obtained independently using salts of FeVI, FeV, and FeIV (K2FeO4, K3FeO4, and Na4FeO4) to oxidize a range of pollutants will be discussed. Examples of the reactions will demonstrate how the ferrate treatment can be optimized to achieve enhance performance to remove pollutants including recalcitrant pollutants like perfluoro compounds.
1. Sharma, V.K.; Chen, L.; Zboril, R. ACS Sustainable Chem. Eng. 2016, 4, 18-34.
2. Sharma, V.K.; Zboril, R.; Varma, R.S. Acc. Chem. Res. 2015, 48, 182-191.
3. Machalová Šišková, K.; Jancula, D.; Drahoš, B.; Machala, L.; Babica, P.; Alonso, P.G.; Trávnícek, Z.; Tucek, J.; Maršálek, B.; Sharma, V.K.; Zboril, R. Phys. Chem. Chem. Phys. 2016, 18 (28), 18802-18810.
4. Feng, M.; Cizmas, L.; Wang, Z.; Sharma, V.K. Chem. Eng. J. 2017, 323, 584-591.
5. Li, C.; Dong, F.; Feng, L.; Zhao, J.; Zhang, T.; Cizmas, L.; Sharma, V.K. Environ. Chem. Lett. 2017, 15(3), 525-530.
Dr. Virender K. Sharma received his Ph.D. from Rosenstiel School of Marine and Atmospheric Science, University of Miami, Florida, USA. His postdoctoral work was at Brookhaven National Laboratory and the State University of New York, Buffalo, New York. He is currently a Professor at 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 environment, resulting in an impact on human and ecological health. He is also working on understanding mechanism of the formation of disinfection byproducts in water. His research also includes studying environment fate of environmentally persistent free radicals and antibiotics resistant bacteria and genes. He has published more than 270 peer-reviewed publications. Dr. Sharma has also published 54 book chapters, 36 proceedings, and authored/edited eight 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 by the Environmental Chemistry Division of the American Chemical Society, Excellence in Review by Environmental Science & Technology, and International Fellowship awarded by the Chinese Academy of Sciences.