Degradation of Chlorinated Contaminants at Mineral - Water Interface: The Engineered vs. Natural Surfaces of Sulfide Materials

氯化污染物在矿泉水界面的降解：硫化物材料的工程表面与天然表面

• 批准号: 1611465
• 负责人: Weile Yan
• 金额: $ 32.5万
• 依托单位: Texas Tech University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1611465&HistoricalAwards=false
• 关键词: Degradation; Chlorinated; Contaminants; Mineral; Water

In this project funded by the Environmental Chemical Sciences Program in the Chemistry Division at the National Science Foundation, Professors Weile Yan and Kayleigh Millerick from Texas Tech University (TTU) investigate a class of surface sulfided iron materials, which may have potential to degrade chlorinated molecules (specifically ethenes) in the sub-surface environment. It is hypothesized that controlled sulfidation of iron metal (Fe(0)) through chemical or biological means creates surfaces that have significantly enhanced reactivity towards chlorinated ethenes. This study explores the use of environmentally-compatible reactive surfaces for in situ abatement of persistent groundwater contaminants. This research provides a training ground for undergraduate and graduate researchers to engage in multidisciplinary investigations in environmental biogeochemistry and remediation. The findings are incorporated into a new course on Environmental Interfacial Chemistry. In addition, the investigators develop experiment kits and introduce the subject of groundwater contamination to K-12 students through science enrichment programs at TTU. The investigators take an integrated experimental approach to probe the relationship between the chemistry of the sulfided materials prepared under different conditions and the reactions of perchloroethene (PCE) and trichloroethene (TCE) on these reactive surfaces. Key factors controlling the rates and pathways of PCE and TCE degradation on these surfaces are elucidated through kinetic and isotopic investigations. The interface between a sulfided overlayer and an Fe(0) phase provides a sustained driving force against oxidative passivation in the environmental media. The transformation of surface sulfided iron and natural iron sulfides in groundwater environment, particularly under the influence of pertinent biogeochemical processes, are studied. This study advances the fundamental understanding of interactions between chlorinated ethenes and reactive surfaces that are either introduced by engineering intervention or naturally present in the subsurface environment. This study explores in situ abatement of persistent groundwater contaminants and trains undergraduate and graduate researchers to engage in multidisciplinary investigations in environmental biogeochemistry and remediation.

在这个由美国国家科学基金会化学部环境化学科学计划资助的项目中，德克萨斯理工大学（TTU）的Weile Yan和Kayleigh Millerick教授研究了一类表面硫化铁材料，这些材料可能具有降解次表面环境中氯化分子（特别是乙烯）的潜力。据推测，通过化学或生物手段对铁金属（Fe（0））的受控硫化产生了对氯化乙烯具有显著增强的反应性的表面。 本研究探讨了使用环境相容的反应表面原位减排持久性地下水污染物。这项研究为本科生和研究生研究人员提供了一个培训基地，从事环境地球化学和修复的多学科调查。研究结果被纳入一个新的课程环境界面化学。此外，研究人员开发实验工具包，并通过TTU的科学富集计划向K-12学生介绍地下水污染的主题。 研究人员采取综合实验方法来探索在不同条件下制备的硫化材料的化学性质与全氯乙烯（PCE）和三氯乙烯（TCE）在这些反应性表面上的反应之间的关系。通过动力学和同位素研究阐明了控制PCE和TCE在这些表面上降解速率和途径的关键因素。硫化覆盖层和Fe（0）相之间的界面提供了对抗环境介质中的氧化钝化的持续驱动力。 研究了地表硫化铁和天然铁硫化物在地下水环境中的转化，特别是在相关地球化学过程的影响下。 这项研究推进了氯化乙烯和反应性表面之间的相互作用，无论是工程干预或自然存在于地下环境中的基本理解。 这项研究探讨了在原地减少持久性地下水污染物和培训本科生和研究生的研究人员从事环境地球化学和修复的多学科调查。