Platform Nanoscale Sorbents for Advanced Separation and Recovery of Metals and Metalloids in Water

用于高级分离和回收水中金属和类金属的纳米级吸附剂平台

• 批准号: 1437820
• 负责人: John Fortner
• 金额: $ 32.98万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1437820&HistoricalAwards=false
• 关键词: Platform; Nanoscale; Sorbents; Advanced; Separation

1437820FortnerPlatform Nanoscale Sorbents for Advanced Separation and Recovery of Metals and Metalloids in WaterThis project will benefit society by providing information that can enable a new approach to adsorptive removal of metals in drinking water. The project is focused on improved treatment of three contaminants, arsenic, uranium and chromium, which are of current interest both within the United States and internationally. Newly created information on magnetic iron oxide sorbents will not only enable their integration into sorption treatment technologies, but it will also benefit other particle-based environmental technologies related to sensing, imaging, and remediation. Systematic evaluation of sorbent regeneration and the properties of the residual solids will contribute to the life cycle assessments of processes that use new sorbents. The research plan will help train the future science and technology workforce through the involvement of high school, undergraduate, and Ph.D. students. In all educational activities, programs will be used to promote increased participation of underrepresented minorities.The project will investigate a potentially transformative new approach to preparing tailored sorbent media for removal of metal and metalloids from drinking water. The platform approach uses engineered iron oxide nanoparticles with high surface areas and affinities for metal adsorption that can be controlled with respect to their aggregation and deposition on substrate supports. The project will advance scientific understanding of metal adsorption of arsenic, uranium and chromium to a novel set of engineered nanoparticles and the factors that control the properties of the nanoparticles and their interactions with supporting media. The project objectives are to: (1) develop model libraries of engineered iron oxide nanoparticles with controlled size, composition, and aqueous stabilities; (2) quantify the adsorption affinity and capacity of the new sorbents and elucidate adsorption mechanisms; (3) evaluate the performance and regeneration potential of sorbent media in realistic treatment configurations. The PIs will pursue these objectives through three integrated tasks. Task 1 they will develop a library of iron oxide nanoparticles with a range of surface coatings and particle sizes, and then characterize the stability of particle suspensions and their deposition to substrate media. Task 2 is a detailed investigation of the adsorption of arsenic, chromium, and uranium to the nanoparticles that will combine batch adsorption experiments, spectroscopic characterization of adsorbed metals, and surface complexation modeling of adsorption. Task 3 will evaluate the performance and regeneration of substrate-supported sorbent materials in continuous-flow column experiments. The research approach will be closely linked with education and outreach activities at their university and in their community.

1437820用于高级分离和回收水中金属和类金属的FortnerPlatform纳米吸附剂该项目将通过提供信息来实现饮用水中金属吸附去除的新方法，从而造福社会。该项目的重点是改善砷、铀和铬三种污染物的处理，这三种污染物目前在美国和国际上都引起了关注。关于磁性氧化铁吸附剂的新信息不仅使其能够集成到吸附处理技术中，而且还将有利于与传感、成像和修复相关的其他基于颗粒的环境技术。吸附剂再生和残留固体特性的系统评估将有助于对使用新吸附剂的工艺进行生命周期评估。该研究计划将通过高中生、本科生和博士生的参与，帮助培训未来的科技人才。学生。在所有教育活动中，项目将用于促进代表性不足的少数群体的更多参与。该项目将研究一种潜在的变革性新方法，以制备定制的吸附剂介质，以去除饮用水中的金属和类金属。该平台方法使用具有高表面积和金属吸附亲和力的工程氧化铁纳米颗粒，可以控制它们在基材支架上的聚集和沉积。该项目将促进对一组新型工程纳米粒子对砷、铀和铬的金属吸附以及控制纳米粒子特性及其与支持介质相互作用的因素的科学理解。该项目的目标是：（1）开发具有受控尺寸、组成和水稳定性的工程氧化铁纳米颗粒模型库； (2)量化新型吸附剂的吸附亲和力和容量并阐明吸附机制； (3) 评估实际处理配置中吸附剂介质的性能和再生潜力。 PI 将通过三项综合任务来实现这些目标。 任务 1 他们将开发一个具有一系列表面涂层和粒径的氧化铁纳米颗粒库，然后表征颗粒悬浮液的稳定性及其在基材介质上的沉积。任务 2 详细研究了砷、铬和铀对纳米粒子的吸附，其中结合了批量吸附实验、吸附金属的光谱表征和吸附的表面络合建模。任务 3 将评估连续流动柱实验中基质支撑的吸附剂材料的性能和再生。研究方法将与大学和社区的教育和外展活动密切相关。