Photochemical Reactions of Particulate Mercury Species at the Water-Particle Interface in Aquatic Environments

水生环境中水颗粒界面处颗粒汞物质的光化学反应

• 批准号: 1905239
• 负责人: Yong Cai
• 金额: $ 42.42万
• 依托单位: Florida International University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-08-01 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1905239&HistoricalAwards=false
• 关键词: Photochemical; Reactions; Particulate; Mercury; Species

In this project, Drs. Yong Cai, Guangliang Liu, and Kevin O'Shea at the Florida International University are funded by the Environmental Chemical Sciences Program of the NSF Division of Chemistry to study the reactions of mercury (Hg) that is associated with particles in aquatic environments. These particulate Hg species (pHg) are very common in natural waters, and they are often thought of as unreactive and not very mobile. However, they do react under the influence of sunlight (photochemical reactions) and need to be considered for an accurate description of Hg cycling, especially the air-water exchange of Hg. This project aims to provide a basic understanding of these photochemical reactions and explore the role of pHg in the air-water Hg exchange. The project has a broad range of benefits to research, education, and outreach at a Hispanic Serving Institution. It provides training for PhD and undergraduate students. Underrepresented minority students gain research experience. The curriculum development of the unique Environmental Chemistry-focused PhD track program is being enhanced. The project also promotes public awareness on Hg contamination and health risks. Since the aquatic particles are semiconducting and photosensitizing in nature, the investigators focus on the photochemical reactions of pHg involving electron-hole pairs and reactive oxygen species. They define the reaction pathways of pHg phototransformations and quantify the kinetics of photochemical reduction of oxidized Hg species and the oxidation of elemental pHg. They also study the mechanisms related to the pHg photoreactions. Experiments using model iron, titanium, and manganese oxide particles of different band gap energies and field-collected particles are combined with quantum chemistry calculations. The bandgap energies analysis uses spectrometric measurements. Particle chemical composition and optical properties are determined using inductively coupled plasma mass spectrometry (ICP-MS) and scanning electron microscopy (SEM). The analysis of elemental and oxidized Hg in the dissolved and particulate phases is based on an isotope dilution, purge and trap, thermal desorption, and ICP-MS method. The research is expected to clarify the involvement of pHg species in Hg photochemical transformation and the role in air-water Hg exchange.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.

在这个项目中，博士。佛罗里达国际大学的Yong Cai，Guangliang Liu和Kevin O'Shea由NSF化学司的环境化学科学计划资助，以研究与水生环境中粒子有关的汞反应（HG）。这些颗粒状HG物种（PHG）在天然水中非常普遍，通常被认为是无反应性的，不是很可移动。但是，它们确实在阳光（光化学反应）的影响下做出反应，并且需要考虑对HG循环的准确描述，尤其是HG的空气水交换。该项目旨在提供对这些光化学反应的基本理解，并探讨PHG在空气水汞交换中的作用。该项目在西班牙裔服务机构的研究，教育和外展方面具有广泛的好处。它为博士和本科生提供培训。代表性不足的少数民族学生获得研究经验。独特的以环境化学为重点的博士轨道计划的课程开发正在增强。该项目还促进了公众对HG污染和健康风险的认识。由于水生颗粒在自然界中是半导体和光敏的，因此研究人员专注于涉及电子孔对和活性氧的PHG的光化学反应。他们定义了PHG光转化的反应途径，并量化了氧化HG物种的光化学还原和元素PHG的氧化的动力学。他们还研究了与PHG光反应有关的机制。使用不同带隙能和场收集颗粒的模型铁，钛和锰氧化物颗粒进行实验与量子化学计算结合。带隙能量分析使用光谱测量值。使用电感耦合等离子体质谱法（ICP-MS）和扫描电子显微镜（SEM）确定颗粒化学成分和光学性能。溶解和颗粒相中元素和氧化的Hg的分析基于同位素稀释，清除和陷阱，热解吸和ICP-MS方法。预计该研究将阐明PHG物种参与HG光化学转化以及在空气水HG交换中的作用。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子和更广泛影响的评估评估来获得支持的。

项目成果

Speciation of thioarsenicals through application of coffee ring effect on gold nanofilm and surface-enhanced Raman spectroscopy

• DOI: 10.1016/j.aca.2020.01.042
• 发表时间: 2020-04-15
• 期刊: ANALYTICA CHIMICA ACTA
• 影响因子: 6.2
• 作者: Liamtsau, Valery;Fan, Changjun;Cai, Yong
• 通讯作者: Cai, Yong

Removal of As(III) from Water Using the Adsorptive and Photocatalytic Properties of Humic Acid-Coated Magnetite Nanoparticles

• DOI: 10.3390/nano10081604
• 发表时间: 2020-08-01
• 期刊: NANOMATERIALS
• 影响因子: 5.3
• 作者: Phuong Pham;Rashid, Mamun;O'Shea, Kevin
• 通讯作者: O'Shea, Kevin

Application of dimensional analysis in sorption modeling of the styryl pyridinium cationic dyes on reusable iron based humic acid coated magnetic nanoparticles

量纲分析在苯乙烯基吡啶鎓阳离子染料在可重复使用的铁基腐殖酸包覆磁性纳米粒子吸附建模中的应用

• DOI: 10.1016/j.chemosphere.2021.131699
• 发表时间: 2022
• 期刊: Chemosphere
• 影响因子: 8.8
• 作者: Esmaeilian, Anahita;O'Shea, Kevin E.
• 通讯作者: O'Shea, Kevin E.