权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

The Reactivity of Green Rust Towards Redox-Stable Trace Metals in Reducing Environments

还原环境中绿锈对氧化还原稳定的痕量金属的反应性

基本信息

批准号：
1904981
负责人：
Evert Elzinga
金额：
$ 22.9万
依托单位：
Rutgers University Newark
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-06-15 至 2024-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1904981&HistoricalAwards=false
关键词：
Reactivity Green Rust Towards Redox

项目摘要

This award from the Environmental Chemical Sciences Program in the Division of Chemistry supports Professor Evert Elzinga and his students to study green rust (GR). GR is an iron-hydroxide mineral that forms in certain natural and engineered environments such soils along river banks, aquifers, drinking water lines, and barriers used for groundwater remediation. These minerals are very reactive and are known to degrade both organic and inorganic pollutants through reduction/oxidation (redox) reactions. Little is known about the reactions involved. The goal of this project is to study the chemical reactivity of GR with a series of environmentally relevant trace metals. The work aims to improve knowledge of the mobility of metal pollutants in reducing environments and provide basic insights into the surface chemistry of green rust minerals. The project provides scientific training for graduate students. Underrepresented minority undergraduate students from the Louis Stokes Alliances for Minority Participation (LSAMP) program at Rutgers-Newark are involved in the research.Trace metals of different sizes and valences (Mn(II), Ni(II), Zn(II), Cd(II), Pb(II) and Cr(III)) are reacted with GR in pre-equilibrated anoxic suspensions over a range of environmentally relevant geochemical conditions. Metal sorption is being monitored over time, and operative mechanisms are determined using synchrotron-based X-ray absorption spectroscopy. The team studies Fe atom cycling between the aqueous phase and the GR solid with Fe-55 radiotracers, and monitors the structure and morphology of GR using X-ray diffraction and transmission electron microscopy analyses. The research provides educational opportunities and exposure to research to graduate and undergraduate students, including members of underrepresented groups.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

化学系环境化学科学项目的这一奖项支持Evert Elzinga教授和他的学生研究绿色锈病（GR）。GR是一种氢氧化铁矿物，在某些自然和工程环境中形成，例如沿着河岸的土壤、含水层、饮用水管线和用于地下水修复的屏障。这些矿物质具有很强的反应性，并且已知通过还原/氧化（氧化还原）反应降解有机和无机污染物。对所涉及的反应知之甚少。该项目的目标是研究GR与一系列环境相关的痕量金属的化学反应性。这项工作旨在提高金属污染物在还原环境中的流动性的知识，并提供绿色锈矿物表面化学的基本见解。该项目为研究生提供科学培训。代表性不足的少数民族本科生从路易斯·斯托克斯少数民族参与联盟（LSAMP）计划在罗格斯大学纽瓦克分校参与了这项研究。不同大小和价态的微量金属（Mn（II），Ni（II），Zn（II），Cd（II），Pb（II）和Cr（III））与GR在预平衡缺氧悬浮液在一系列环境相关的地球化学条件。随着时间的推移，金属吸附被监测，并使用同步加速器为基础的X射线吸收光谱确定的运作机制。该团队使用Fe-55放射性示踪剂研究了水相和GR固体之间的Fe原子循环，并使用X射线衍射和透射电子显微镜分析来监测GR的结构和形态。该研究为研究生和本科生提供了教育机会和接触研究的机会，包括代表性不足的群体的成员。该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估来支持。