CAREER: Fundamentals of Nanoparticle Behavior in Water Treatment

Sharon Walker加州大学河滨分校CAREER：水处理中纳米颗粒行为的基础CBET-0954130人类工程纳米材料释放到环境中的命运，运输和毒性，特别是进入废水处理和地表水和地下水系统是一个具有重大社会和科学意义的话题。 该资助项目是对纳米材料与环境之间物理化学相互作用的系统研究。 其目标是评估传统废水处理工艺在捕获和/或去除家庭供水中常见的人类工程纳米颗粒方面的有效性。 这项工作涉及广泛的纳米颗粒表征和环境相关条件下的传输实验。 将研究三类纳米颗粒的行为和相互作用：金属氧化物（赤铁矿，氧化钛，氧化铈，氧化锌），金属（金）和碳基（碳纳米管）。 还将检查常用的各种包衣/封端剂（如右旋糖酐、DMSA和聚苯胺）对这些微粒的影响。 将测试裸纳米颗粒和涂覆/封端的纳米颗粒。 它们的稳定性，反应性和去除效果将在水处理的四个阶段中的每一个阶段进行评估：混凝，絮凝，沉淀和过滤。 纳米材料的行为在广泛的水质参数，从简化的电解质复杂的溶液化学将被检查。过滤机制也将在微观和宏观流动系统中进行研究。 纳米粒子的特性，如电泳迁移率，疏水性，晶体结构，浓度和大小和形状对废水处理过程的效率和效果的影响将使用透射电子显微镜，紫外/维斯，时间分辨动态光散射，荧光标记，磁饱和，和其他方法进行检查。 实验将在填充床柱和微型模型系统中进行。 该研究的更广泛影响包括提高我们对纳米颗粒运输及其从饮用水中捕获和去除的知识。 这项工作支持早期职业PI，其性别在科学和工程领域代表性不足，将吸引当地社区学院的西班牙裔本科生，并将纳入本科课程。 该工作还将通过准备有关如何开发水质科学博览会项目的材料，与滨江联合学区的K12教师和学生以及大学生合作。

Sharon WalkerUniversity of California-RiversideCAREER: Fundamentals of Nanoparticle Behavior in Water TreatmentCBET - 0954130The fate, transport, and toxicity of human engineered nanomaterials released into in the environment, especially into wastewater treatment and surface and groundwater systems is a topic of great societal and scientific importance. The funded project is a systematic investigation of the physicochemical interactions between nanomaterials and the environment. Its goal is to assess the effectiveness of conventional wastewater treatment processes in trapping and/or removing common human-engineered nanoparticles from domestic water supplies. The work involves extensive nanoparticle characterization and transport experiments under environmentally relevant conditions. The behavior and interaction of three categories of nanoparticles will be examined: metal oxides (hematite, titanium oxide, cerium oxide, zinc oxide), metal (gold), and carbon-based (carbon nanotubes). The impact of various coating/capping agents such as Dextran, DMSA, and Polyamiline that are commonly used on these particles will also be examined. Both bare and coated/capped nanoparticles will be tested. Their stability, reactivity, and the effectiveness of removal will be evaluated at each of the four stages of water treatment: coagulation, flocculation, sedimentation, and filtration. Nanomaterial behavior over a wide range of water quality parameters, from simplified electrolytes to complex solution chemistries will be examined. Filtration mechanisms will also be investigated in microscopic and macroscopic flow systems. The impacts of nanoparticle characteristics such as electrophoretic mobility, hydrophobicity, crystalline structure, concentration, and size and shape on the efficiency and effectiveness of wastewater treatment processes will be examined using transmission electron microscopy, UV/Vis, time-resolved dynamic light scattering, fluorescent labeling, magnetic saturation, and other methods. Experiments will take place in packed bed columns and micromodel systems. Broader impacts of the research include improving our knowledge of nanoparticle transport and their trapping and removal from drinking water. The work supports an early career PI whose gender is underrepresented in the sciences and engineering, will engage Hispanic undergraduates from a local community college, and will be incorporated into undergraduate courses. The work will also partner K12 teachers and students at the Riverside Unified School District with university students through the preparation of materials on how to develop science faire projects on water quality.