| 报告题目 | Black Carbon: a Reactive Sorbent for the Destruction of Hazardous Organic Contaminants (HOCs) |
| 报告人 | Dr. XU Wenqing |
| 报告人单位 | Villanova University |
| 报告时间 | 2015-05-18 |
| 报告地点 | 合肥微尺度物质科学国家实验室一楼科技展厅 |
| 主办单位 | 合肥微尺度物质科学国家实验室、中国科学技术大学化学与材料科学学院 |
| 报告介绍 | 报告摘要：
Sediments are important sinks for hydrophobic compounds discharged to surface waters. Hydrophobic compounds tend to associate strongly with black carbon, which is thought to comprise 10 to 30 % of total organic carbon in aquatic sediments. Sorption to black carbon has been assumed to hinder degradation by pathways that occur in the aqueous phase. However, recent studies indicate that black carbon can mediate abiotic reduction and nucleophilic substitution reactions of nitrated organic compounds with hydrogen sulfide. In this study, we extended the applicability of black carbon-mediated reactions to a wider variety of contaminant structures, including nitrated and halogenated aromatic compounds, heterocyclic aromatic compounds, and halogenated alkanes. While both nitro- and halonitroaromatic compounds underwent black carbon mediate reaction with hydrogen sulfide, product analysis indicated that the nitro group was the primary site of attack. We have also demonstrated that the reactivity of nitrated aromatics correlated with the calculated energy of the lowest unoccupied molecular orbital.
报告人简介：
Dr. Wenqing Xu received a B.S. in Environmental Engineering in 2007 from Nankai University and a M.S. in Environmental Engineering in 2009 from Johns Hopkins University. After completing her Ph.D. in Environmental Engineering at Yale University in 2014, she joined the department of Civil and Environmental Engineering at Villanova University. Her research interest builds upon the fundamental understanding of environmental interfacial chemistry, with the goal of applying them to both natural and engineered systems to address today’s environmental challenges. Dr. Xu is actively engaged in both research and teaching, with the ultimate goal of transforming fundamental environmental interfacial chemistry knowledge into providing solutions for safe drinking water, nutrientrecovery, and mitigating climate change. |
