Collaborative Research: Adsorption and Photochemical Transformations of Arsenic and Selenium Species by Natural Organic Matter-Coated Magnetic Nano-sized Iron Oxide Particles

合作研究：天然有机物包覆磁性纳米氧化铁颗粒对砷和硒的吸附和光化学转化

基本信息

批准号：
1710111
负责人：
Kevin O'Shea
金额：
$ 25.84万
依托单位：
Florida International University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-08-15 至 2021-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1710111&HistoricalAwards=false
关键词：
Collaborative Research Adsorption Photochemical Transformations

项目摘要

This award is supported jointly by the Chemistry Division's Environmental Chemical Sciences Program and the Environmental Engineering Program in the Division of Chemical, Bioengineering, Environmental, and Transport Systems. The collaborative study involves Professors Kevin E. O'Shea and Yong Cai from Florida International University and Professor Dionysios D. Dionysiou from University of Cincinnati. Together with their students, the faculty members seek to develop an environmentally-friendly approach to purifying water. Water contamination by highly toxic arsenic (As) and selenium (Se) is a serious threat to the environment. This has affected the health of hundreds of millions of humans globally. The approach is to coat magnetic iron oxide nanoparticles with natural organic matter (NOM). The coated nanoparticles can strongly bind arsenic and selenium and can convert them to less toxic forms upon solar irradiation. The magnetic nanoparticles carrying the arsenic and selenium are later removed from the contaminated water with a magnet. Overall, the research activities are expected to strengthen co-operation among the local community, educational institutes, and investigators. Thebroader societal impacts of this research include enhancing sustainable development. The knowledge obtained from these studies guides the development of new water treatment methodologies using environmentally-friendly materials. Application of these insights may accelerate the implementation of related technologies in addressing environmental problems, as well as advance the understanding of the interaction of natural organic matter and metals to determine their fate, transport and bioavailability. The research plan emphasizes participation of persons from underrepresented groups. It also includes a high school outreach program with local schools to educate the students on water quality and water contamination issues.The project seeks to develop a fundamental understanding of the molecular interactions of As and Se species with fractionated NOM and the subsequent NOM-photosensitized redox transformations of As and Se. Specific trapping or quenching agents are used to study the roles of individual reactive oxygen species, electron transfer and energy transfer processes in the NOM photosensitized transformations. These fundamental studies guide the selection of the most promising NOM fractions for grafting onto the surface of different sized magnetic iron oxide nanoparticles for the process of interest. The research is expected to aid in the development of strategies for optimizing removal and conversion of toxic metals. Such a process is is critical to water reuse and treatment.

该奖项由化学系的环境化学科学计划和化学、生物工程、环境和运输系统系的环境工程计划联合支持。这项合作研究涉及佛罗里达国际大学的 Kevin E. O'Shea 教授和 Yong Cai 教授以及辛辛那提大学的 Dionysios D. Dionysiou 教授。教职员工与学生一起寻求开发一种环保的水净化方法。剧毒砷 (As) 和硒 (Se) 造成的水污染对环境造成严重威胁。这影响了全球数亿人的健康。该方法是用天然有机物（NOM）涂覆磁性氧化铁纳米颗粒。涂覆的纳米粒子可以牢固地结合砷和硒，并可以在太阳照射下将它们转化为毒性较小的形式。随后用磁铁从受污染的水中去除携带砷和硒的磁性纳米颗粒。总体而言，研究活动预计将加强当地社区、教育机构和研究人员之间的合作。这项研究的更广泛的社会影响包括加强可持续发展。从这些研究中获得的知识指导使用环保材料开发新的水处理方法。这些见解的应用可以加速解决环境问题的相关技术的实施，并促进对天然有机物和金属相互作用的理解，以确定它们的命运、运输和生物利用度。该研究计划强调代表性不足群体的参与。它还包括与当地学校一起开展的高中外展计划，以教育学生有关水质和水污染问题的知识。该项目旨在对 As 和 Se 物质与分馏 NOM 以及随后的 NOM 光敏氧化还原的分子相互作用有基本的了解As 和 Se 的转化。特定的捕获剂或猝灭剂用于研究 NOM 光敏转化中各个活性氧、电子转移和能量转移过程的作用。这些基础研究指导选择最有前途的 NOM 组分，用于接枝到不同尺寸的磁性氧化铁纳米颗粒的表面，以实现感兴趣的过程。该研究预计将有助于制定优化有毒金属去除和转化的策略。这样的过程对于水的再利用和处理至关重要。