Impact of Redox-driven Recrystallization on the Stability and Reactivity of Uranium and Lead Oxides

氧化还原驱动的重结晶对铀和铅氧化物的稳定性和反应性的影响

• 批准号: 1709484
• 负责人: Daniel Giammar
• 金额: $ 40万
• 依托单位: Washington 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: 2017-08-01 至 2021-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1709484&HistoricalAwards=false
• 关键词: Impact; Redox; driven; Recrystallization; Stability

This award is supported by the Chemistry Division's Environmental Chemical Sciences Program. Professors Daniel Giammar and Jeffrey Catalano and their groups at Washington University in St. Louis study uranium and lead, which are naturally-occurring, toxic elements and important environmental contaminants. Uranium and lead often exist in nature as oxides (bonded to oxygen). Uranium and iron oxide reactivity in the environment depend on their oxidation-reduction ("redox") chemistry. The recrystallization of these species can impact their toxicity. This study extends our understanding of the occurrence and environmental impacts of redox-driven recrystallization of uranium and lead oxides. The work builds on related studies of recrystallization of other metal oxides, notably iron oxides ("rust") and manganese oxides. The scientific knowledge gained by this project can be used to reduce exposure to uranium in contaminated groundwater and to lead in contaminated drinking water. The research is integrated with educational activities that involve curriculum enrichment, graduate student training, and outreach to K-12 students and other members of the public. The project explores redox-driven recrystallization as a general phenomenon of environmental significance common to many semiconducting metal oxides. Specific targets include measurements of the rates and the extent of isotope exchange between aqueous uranium (VI) and solid uranium (IV) oxides and between aqueous lead (II) and solid lead (IV) oxides. The impacts of recrystallization on the composition, structure and size of the resulting particles is being characterized. Isotope exchange and recrystallization under conditions relevant to remediation of uranium-contaminated groundwater and the control of lead in drinking water distribution systems are being used to quantify the impacts of recrystallization on contaminant mobility.

该奖项由化学部的环境化学科学项目支持。圣路易斯华盛顿大学的Daniel Giammar和Jeffrey Catalano教授和他们的团队研究铀和铅，它们是自然存在的有毒元素和重要的环境污染物。铀和铅在自然界中通常以氧化物(与氧结合)的形式存在。铀和氧化铁在环境中的反应性取决于它们的氧化还原(“氧化还原”)化学。这些物种的重结晶会影响它们的毒性。这项研究扩大了我们对氧化还原驱动的铀和铅氧化物重结晶的发生和环境影响的理解。这项工作建立在对其他金属氧化物，特别是铁氧化物(“铁锈”)和锰氧化物再结晶的相关研究的基础上。通过该项目获得的科学知识可用于减少受污染地下水中的铀暴露和受污染饮用水中的铅。这项研究与教育活动相结合，涉及课程充实、研究生培训以及对K-12学生和其他公众的推广。该项目探索氧化还原驱动的再结晶是许多半导体金属氧化物普遍存在的具有环境意义的普遍现象。具体目标包括测量水中铀(VI)和固体铀(IV)氧化物之间以及水中铅(II)和固体铅(IV)氧化物之间的同位素交换速率和程度。重结晶对所得颗粒的成分、结构和尺寸的影响正在表征中。正在使用与修复受铀污染的地下水和控制饮用水分配系统中的铅有关的条件下的同位素交换和再结晶，以量化再结晶对污染物流动的影响。

项目成果

Effect of Cu(II) on Mn(II) Oxidation by Free Chlorine To Form Mn Oxides at Drinking Water Conditions

饮用水条件下 Cu(II) 对游离氯氧化 Mn(II) 形成氧化锰的影响

• DOI: 10.1021/acs.est.9b06497
• 发表时间: 2020
• 期刊: Environmental Science & Technology
• 影响因子: 11.4
• 作者: Li Guiwei;Pan Weiyi;Zhang Lili;Wang Ziqiao;Shi Baoyou;Giammar Daniel E.
• 通讯作者: Giammar Daniel E.

Accumulation on and extraction of lead from point-of-use filters for evaluating lead exposure from drinking water

• DOI: 10.1039/d0ew00496k
• 发表时间: 2020-10
• 作者: Weiyi Pan;E. Johnson;D. Giammar

Lead Phosphate Particles in Tap Water: Challenges for Point-of-Use Filters

自来水中的磷酸铅颗粒：使用点过滤器面临的挑战

• DOI: 10.1021/acs.estlett.1c00055
• 发表时间: 2021
• 期刊: Environmental Science & Technology Letters
• 影响因子: 10.9
• 作者: Pan, Weiyi;Johnson, Elizabeth R.;Giammar, Daniel E.
• 通讯作者: Giammar, Daniel E.

Impact of Cu(II) and Zn(II) on the Reductive Dissolution of Pb(IV) Oxide

Cu(II) 和 Zn(II) 对 Pb(IV) 氧化物还原溶解的影响

• DOI: 10.1021/acs.estlett.9b00612
• 发表时间: 2019
• 期刊: Environmental Science & Technology Letters
• 影响因子: 10.9
• 作者: Pan, Weiyi;Schattner, Lia;Guilak, Justin;Giammar, Daniel
• 通讯作者: Giammar, Daniel

Effect of Aluminum on Lead Release to Drinking Water from Scales of Corrosion Products

• DOI: 10.1021/acs.est.0c00738
• 发表时间: 2020-05-19
• 期刊: ENVIRONMENTAL SCIENCE & TECHNOLOGY
• 影响因子: 11.4
• 作者: Li, Guiwei;Bae, Yeunook;Giammar, Daniel E.
• 通讯作者: Giammar, Daniel E.