CAREER: Measurement of Photochemical Mechanisms, Rates, and Pathways of Radical Formation in Complex Organic Compounds

职业：测量复杂有机化合物中自由基形成的光化学机制、速率和途径

• 批准号: 2340926
• 负责人: David Podgorski
• 金额: $ 74.78万
• 依托单位: University of New Orleans
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-03-01 至 2029-02-28
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2340926&HistoricalAwards=false
• 关键词: CAREER; Measurement; Photochemical; Mechanisms; Rates

With support from the Environmental Chemical Sciences (ECS) Program in the Division of Chemistry and the Established Program to Stimulate Competitive Research (EPSCoR), David C. Podgorski at the University of New Orleans and his students will study the process, length of time, and compounds that survive when hydrocarbon compounds are exposed to sunlight. Thousands of oil spills occur each year in U.S. waters. There are hundreds of thousands of chemical compounds in oil, and the products of their chemical transformation can have deleterious effects on human health and sensitive aquatic ecosystems. The energy from the sun can chemically break down the components released in such oil spills. There is a plethora of information about the breakdown and removal process of a couple of hundred small-size compounds in oil by the sun. However, knowledge is lacking about the chemical fate of the polyaromatic hydrocarbon (PAH) fraction, an important compound class in the oil. Project data will show how the sun removes these compounds from the environment and how long it takes. In addition, this project will provide training and mentoring to diverse students. High school students will be involved in research in the summer. Experiments will be performed to measure the chemical changes of complex organic compounds when subjected to simulated sunlight. The will be a particular focus on polyaromatic hydrocarbon (PAH) fraction and on the structure and distribution of oxidation products derived from irradiation of fused benzenoid systems. The chemical composition of degradation products will be measured by ultrahigh-resolution mass spectrometry and infrared spectroscopy. Chemical probe, spectroscopic, and laboratory pump-probe methods will be used to study photo-produced reactive transients. The effects of dispersant, solar irradiance, temperature, and chemical structure on the above processes will be determined. The work will inform stakeholders and provide workforce development training opportunities for high school, undergraduate, and graduate students.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.

在化学系环境化学科学（ECS）计划和刺激竞争性研究（EPSCoR）既定计划的支持下，大卫C。新奥尔良大学的Podgorski和他的学生将研究碳氢化合物暴露在阳光下的过程、时间长度和化合物。美国沃茨每年发生数千起石油泄漏事件。石油中含有数十万种化合物，其化学转化产物可能对人类健康和敏感的水生生态系统产生有害影响。来自太阳的能量可以化学分解这些石油泄漏中释放的成分。关于太阳对石油中几百种小分子化合物的分解和去除过程，有太多的信息。然而，知识是缺乏的多环芳烃（PAH）馏分，在石油中的一个重要的化合物类的化学命运。项目数据将显示太阳如何从环境中去除这些化合物以及需要多长时间。此外，该项目将为不同的学生提供培训和指导。高中生将在夏天参与研究。将进行实验，以测量复杂的有机化合物在模拟阳光下的化学变化。这将是一个特别关注的多环芳烃（PAH）馏分和结构和分布的氧化产物来自辐照稠苯系统。将通过超高分辨率质谱法和红外光谱法测量降解产物的化学组成。化学探针，光谱和实验室泵探测方法将用于研究光产生的反应瞬态。将确定分散剂、太阳辐照度、温度和化学结构对上述过程的影响。这项工作将告知利益相关者，并为高中生、本科生和研究生提供劳动力发展培训机会。该奖项反映了NSF的法定使命，并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，被认为值得支持。