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 FortnerPlatform纳米级吸附剂用于水中金属和类金属的高级分离和回收该项目将通过提供可以实现饮用水中金属吸附去除新方法的信息来造福社会。该项目的重点是改善三种污染物的处理，砷，铀和铬，这是目前在美国和国际上的利益。关于磁性氧化铁吸附剂的新信息不仅可以将其整合到吸附处理技术中，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。吸附剂再生和残余固体性质的系统评价将有助于使用新吸附剂的工艺的生命周期评估。该研究计划将通过高中，本科和博士的参与来帮助培养未来的科学和技术劳动力。学生在所有的教育活动中，项目将用于促进代表性不足的少数民族的参与。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，用于去除饮用水中的金属和类金属。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，其可以相对于其在基底支撑物上的聚集和沉积进行控制。该项目将推进对砷，铀和铬的金属吸附到一组新的工程纳米颗粒的科学理解，以及控制纳米颗粒特性及其与支持介质相互作用的因素。该项目的目标是：（1）开发具有可控尺寸、组成和水稳定性的工程氧化铁纳米颗粒的模型库;（2）量化新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。项目执行人将通过三项综合任务实现这些目标。 任务1他们将开发一个具有一系列表面涂层和粒度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底介质上的沉积。任务2是一个详细的调查砷，铬，铀的吸附纳米粒子，将结合联合收割机批量吸附实验，光谱表征吸附的金属，和表面络合吸附建模。任务3将评估连续流柱实验中基质支撑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联活动密切相关。