NER: Nanoscale Size Effects on the Biogeochemical Reactivity of Iron Oxides in Active Environmental Nanosystems

0608749 Giammar该项目将研究活性环境纳米系统中关键生物化学过程的尺寸依赖性。由氧化铁纳米颗粒和铁还原微生物组成的活性纳米系统影响自然生态地球化学循环，可以为改进环境修复技术提供基础。它将包括一个定量动力学分析和吸附物种的表面配位建模。该项目将侧重于纳米颗粒反应性研究的基本方面，将在三个相关主题上进行：（1）U（VI）和Fe（II）在纳米赤铁矿上的吸附，（2）表面结合的Fe（II）还原U（VI）的速率，以及（3）赤铁矿的生物和化学还原速率。 拟议的研究将有助于各种领域，包括化学，地球化学和材料科学。PI进行了一些初步实验，表明该项目很有可能成功。这三位PI在专业领域互补，并在表面化学领域具有良好的资格。该项目有一个强大的教育和推广组成部分，包括通过现有的REU计划和外展到高中通过NSF-STARS计划的本科生的参与。

0608749GiammarThis project will study the size-dependence of on critical biogeochemical processes in active environmental nanosystems. Active nanosystems comprised of iron oxide nanoparticles and iron-reducing microorganisms influence natural biogeochemical cycles and can provide the basis for improved environmental remediation technologies. It will include a quantitative kinetic analysis and modeling of surface coordination of adsorbed species. The project will focus on fundamental aspects of nanoparticle reactivity research will be conducted on three related topics: (1) adsorption of U(VI) and Fe(II) onto nano-hematite, (2) rates of U(VI) reduction by surface-bonded Fe(II), and (3) rates of biological and chemical reduction of hematite. The proposed research will contribute to a variety of fields, including chemistry, geochemistry, and material science. The PIs have conducted some preliminary experiments that indicate a high likelihood that the project will be successful. The three PIs have complementary areas of expertise and are well qualified in the area of surface chemistry. The project has a strong educational and outreach component, including participation of undergraduates through an existing REU program and outreach to high schools through the NSF-STARS program.