11月5日美国奥本大学Dongye Zhao教授讲座预告

　　讲座主题：稳定化纳米颗粒用于土壤和地下水中重金属的固定化
　　　　　　　Development and Applications of Stabilized Nanoparticles for in situ Immobilization of

　　　　　　　Metals/Metalloids in Soil and Groundwater
    
　　讲座人：赵东叶教授 美国奥本大学
　　时间：11月5日下午3:30
　　地点：生物楼二楼报告厅
    
　　内容简介：
　　Remediation of soils and groundwater contaminated with toxic metals and metalloids has been a major environmental challenge for decades. Yet, cost-effective and sustainable in situ remediation technologies remain lacking. Through bbin电子 than a decade of intensive research, the Auburn University research team has developed a strategy to synthesize highly stable, soil-dispersible nanoparticles using low-cost and “green” polysaccharides, such as starch and carboxymethyl cellulose (CMC), as a stabilizer. The stabilizers can facilitate controlling the size, delivery and transport of the nanoparticles.
    
　　This presentation will introduce the concept of in situ immobilization of metals/metalloids in soil and groundwater using various stabilized nanoparticles, and overview the effectiveness of the stabilized nanoparticles, including zero-valent iron (ZVI) for reductive immobilization of U(VI), Tc(VII), and Cr(VI), FeS for sorption of Hg(II), Pb(II) and Cd(II), and Fe-Mn binary oxides for As(V) and As(III). Lab and field-scale experiments demonstrated that these nanoparticles offer some unprecedented advantages over traditional aggregated particles, including: 1) they can be delivered and dispersed in various soils and attack contaminant plumes deep in aquifers, and 2) they offer strong affinity and high sorption capacity toward the target metals/metalloids. We also characterized the environmental fate and transport of these stabilized nanoparticles in the subsurface. While the application of the stabilizers facilitated the soil deliverability and dispersion of the nanoparticles, once delivered, the nanoparticles will remain in the targeted domain under typical natural soil and groundwater conditions, serving as a long-term sink for the contaminants. The in situ immobilization technology holds the potential to greatly advance the conventional practices in remediation of contaminated soil and groundwater.
    
　　主讲人简介：
　　赵东叶教授是美国奥本大学的Huff Professor，是美国环境纳米科学与技术研究领域知名科学家，于1998年毕业于美国Lehigh大学，获博士学位。主要研究方向包括纳米材料及技术在环境清理和修复中的应用；工程纳米粒子在环境中的归宿、迁移及影响等。共发表了90余篇SCI论文（引用>3200， H因子32），拥有6个美国授权专利，并出版1本环境纳米技术的教科书。他的课题组首次使用淀粉和改性纤维素合成了具有土壤流动性的零价纳米铁和其它纳米颗粒，工作被广泛引用并在全球多个场地得到中试测试。