RII Track-4: Molecular understanding of salt-induced selective aggregation and selective sorption of dissolved organic matter to natural particles

RII Track-4：盐诱导选择性聚集和溶解有机物选择性吸附到天然颗粒的分子理解

• 批准号: 1738340
• 负责人: Mohammed Baalousha
• 金额: $ 28.64万
• 依托单位: University of South Carolina at Columbia
• 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: 2017-09-15 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1738340&HistoricalAwards=false
• 关键词: RII; Track; Molecular; understanding; salt

Non-technical DescriptionDissolved organic matter (DOM) is ubiquitous in natural soils, sediments, and waters, and is a complex mixture of several thousands of organic compounds that were produced primarily from the decay of plant matter. The amount and composition of DOM affects a range of critical ecosystem functions, and plays important roles in regulating the chemistry of environments as diverse as soils, surface waters, and marine systems. DOM can selectively combine with salts and attach to natural particles, which would change their chemical properties in complex ways. This project aims to determine the molecular-level composition and properties of DOM compounds using advanced analytical techniques available at the Environmental Molecular Sciences Laboratory (EMSL) of the Pacific Northwest National Laboratory. Obtaining molecular-level properties for individual molecules will enable more specific identification of the DOM molecules and improve our understanding of their behaviors, fate, and transport in the environment. The outcome of the proposed research has direct implications for environmental and human health as it may be used by water and wastewater treatment facilities to develop novel approaches to achieve more effective approaches for DOM removal. In addition to providing access to the facilities at EMSL and expanding the PI's research capacity, this project will provide training, mentorship, and continued collaborations for the PI and a post-doctoral fellow at the University of South Carolina at Columbia.Technical DescriptionSelective aggregation and sorption of DOM to natural particles is highly relevant to a wide variety of environmental processes, yet they are poorly understood. Such understanding is currently hampered by the high diversity and complexity of DOM and the limited resolution of available mass spectrometers. The intellectual merit of this proposal lies in the application of ultrahigh resolution mass spectroscopy techniques to identify DOM molecules that selectively aggregate or selectively sorb to natural particles and the characterization of their structural properties at the individual molecular level. The overall aim of this proposed research is to characterize the molecular composition and properties of DOM compounds susceptible to aggregation or sorption to natural particles as a function of DOM composition, salt type and natural particle properties. This aim will be achieved by characterizing the molecular composition and properties of DOM molecules in solution (that is 10 kDa) before and after mixing with salts of Ca2+, Mg2+, Al3+, and Fe3+, and natural clay and metal (Fe, Mn, Al, and Si) oxide particles using 21 T Electrospray ionization ultrahigh resolution-Fourier transform-ion cyclotron resonance-mass spectrometry (ESI-FT-ICR-MS). Molecular-level characterization of DOM will be performed at the Environmental Molecular Sciences Laboratory (EMSL). The EMSL personnel will: facilitate the EPSCoR-NSF fellow access to the molecular analysis facilities; provide hands-on training for sample analysis, data collection, analysis, and interpretation; and provide overall mentorship. This EPSCoR-NSF fellowship will provide a unique training opportunity for the PI and a postdoctoral fellow by spending time at the EMSL.

非技术描述滴定有机物（DOM）在天然土壤，沉积物和水域中无处不在，并且是数千种有机化合物的复杂混合物，这些混合物主要是由植物物质衰减产生的。 DOM的数量和组成影响一系列关键生态系统功能，并在调节土壤，地表水和海洋系统等多样性的环境中起着重要作用。 DOM可以选择性地与盐结合并附着于天然颗粒上，这将以复杂的方式改变其化学性质。该项目旨在使用在太平洋西北国家实验室的环境分子科学实验室（EMSL）上使用的先进分析技术来确定DOM化合物的分子水平组成和性能。获得单个分子的分子级特性将使DOM分子更具体地识别，并提高我们对环境中其行为，命运和运输的理解。拟议的研究的结果直接对环境和人类健康产生了影响，因为水和废水处理设施可以使用它来开发新的方法，以实现更有效的DOM去除方法。除了提供EMSL的设施并扩大PI的研究能力外，该项目还将为PI提供培训，指导，并继续为PI和南卡罗来纳大学哥伦比亚大学的博士后研究员提供培训，指导性的描述性启动和索取DOM对自然粒子的索取和索取的差异很差，它们是一个较大的环境过程，它们是各种各样的环境的，他们是他们的各种各样的过程，它们是他们的各种各样的过程，它们是他们的各种各样的过程，它们是他们的各种各样的粒子。目前，DOM的高度多样性和复杂性以及可用质谱仪的有限分辨率受到阻碍。该提案的智力优点在于应用超高分辨率质谱技术来鉴定选择性地汇总或选择性地汇总或选择性地将其与自然颗粒进行的分子及其在单个分子水平上的结构特性的表征。这项提出的研究的总体目的是表征易受聚集或吸附自然颗粒的分子组成和特性，这是DOM成分，盐类型和自然颗粒特性的函数。通过表征与Ca2+，Mg2+，Mg2+，Al3+和Fe3+的盐混合之前和之后，将通过表征溶液（即10 kDa）中DOM分子的分子组成和特性来实现此目标（ESI-FT-ICR-MS）。 DOM的分子级表征将在环境分子科学实验室（EMSL）上进行。 EMSL人员将：促进EPSCOR-NSF访问分子分析设施的访问；提供动手培训，以进行样本分析，数据收集，分析和解释；并提供整体指导。这项EPSCOR-NSF奖学金将通过在EMSL上度过时间为PI和博士后研究员提供独特的培训机会。

项目成果

Natural organic matter composition and nanomaterial surface coating determine the nature of platinum nanomaterial-natural organic matter corona

• DOI: 10.1016/j.scitotenv.2021.150477
• 发表时间: 2021-09-23
• 期刊: SCIENCE OF THE TOTAL ENVIRONMENT
• 影响因子: 9.8
• 作者: Baalousha, Mohammed;Sikder, Mithun;Hess, Nancy J.
• 通讯作者: Hess, Nancy J.

Nanoparticle size and natural organic matter composition determine aggregation behavior of polyvinylpyrrolidone coated platinum nanoparticles

• DOI: 10.1039/d0en00659a
• 发表时间: 2020-11
• 期刊: Environmental science. Nano
• 作者: M. Sikder;Jingjing Wang;Brett A. Poulin;M. Tfaily;Mohammed Baalousha

Natural organic matter composition determines the molecular nature of silver nanomaterial-NOM corona

• DOI: 10.1039/c8en00018b
• 发表时间: 2018-04-01
• 期刊: ENVIRONMENTAL SCIENCE-NANO
• 影响因子: 7.3
• 作者: Baalousha, Mohammed;Afshinnia, Kamelia;Guo, Laodong
• 通讯作者: Guo, Laodong