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RUI: Adsorption and Surface Mediated Photo-Degradation Rate of Contaminants on Colloidal Natural Organic Matter

RUI：污染物在胶体天然有机物上的吸附和表面介导的光降解率

基本信息

批准号：
1808468
负责人：
Mahamud Subir
金额：
$ 24.84万
依托单位：
Ball State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-07-01 至 2023-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1808468&HistoricalAwards=false
关键词：
RUI Adsorption Surface Mediated Photo

项目摘要

With support from the Environmental Chemical Sciences Program of the Chemistry Division, Dr. Mahamud Subir and his students at Ball State University explore the influence of Natural Organic Matter (NOM) on the transport and fate of emerging contaminants (ECs). ECs, such as pharmaceuticals and endocrine disruptors, are commonly detected in aquatic environments. NOM are particles suspended in environmental waters that consist of carbon-based molecules. NOM plays a role in aquatic pollutant distribution and transformation, but exactly how and to what extent remains unclear. This study focuses on finding the effect of NOM particle size and surface constituents on the uptake and photochemical breakdown of organic contaminants. The projects provide undergraduate students with a unique opportunity to perform hands-on experiments. The study creates information about binding strength of the contaminant molecules and NOM, and the rates of reactions that are mediated by the NOM surfaces. These findings help to explain the impact of ECs on our ecosystem and our health. This study uses both traditional and advanced laser spectroscopic tools in the areas of nano-, surface, and environmental chemistry. Second Harmonic Generation (SHG) and other analysis techniques isolate the surface effect from the bulk solution phase photochemistry of organic pollutants. The project develops model colloidal NOM using humic substances of distinct composition. The binding affinities of various ECs to the model NOM surfaces are measured. The rate of photolysis of both chemi- and physi-sorbed molecules at the NOM-aqueous interface is determined. In addition, the project investigates the influence of NOM size, solution acidity, and presence of reactive hydroxyl radicals on the processes of interest. These results are expected to yield an extensive catalogue of adsorption equilibrium and photo-kinetic parameters. They also provide fundamental insight into the nature of specific EC-NOM surface interactions. This knowledge can potentially assist in developing remediation methodologies.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项目的支持下，Mahamud Subir博士和他在鲍尔州立大学的学生探索了天然有机物（NOM）对新兴污染物（EC）的运输和命运的影响。EC，如药物和内分泌干扰物，通常在水生环境中检测到。NOM是由碳基分子组成的悬浮在环境沃茨中的颗粒。NOM在水污染物分布和转化中起作用，但具体如何以及在多大程度上起作用仍不清楚。本研究的重点是发现NOM颗粒的大小和表面成分对有机污染物的吸收和光化学分解的影响。这些项目为本科生提供了一个独特的机会来进行动手实验。该研究创建了有关污染物分子和NOM的结合强度以及NOM表面介导的反应速率的信息。这些发现有助于解释EC对我们的生态系统和健康的影响。这项研究使用了纳米，表面和环境化学领域的传统和先进的激光光谱工具。二次谐波发生（SHG）和其他分析技术将表面效应与有机污染物的本体溶液相光化学分离开来。该项目使用不同成分的腐殖物质开发模型胶体NOM。测量了各种EC与模型NOM表面的结合亲和力。确定了NOM-水界面处的化学和物理吸附分子的光解速率。此外，该项目还研究了NOM尺寸、溶液酸度和反应性羟基自由基的存在对相关过程的影响。这些结果预计将产生一个广泛的目录的吸附平衡和光动力学参数。它们还提供了对特定EC-NOM表面相互作用性质的基本见解。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。