Fouling resistant, freestanding zwitterionic polysulfones for osmotically driven membrane processes

用于渗透驱动膜工艺的防垢、独立式两性离子聚砜

• 批准号: 1836719
• 负责人: Matthew Green
• 金额: $ 31.12万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1836719&HistoricalAwards=false
• 关键词: Fouling; resistant; freestanding; zwitterionic; polysulfones; Fouling; resistant; freestanding; zwitterionic; polysulfones

Providing sustainable and secure access to potable water is a critical challenge facing this generation. Natural water sources are treated to remove salt, organic matter, and biological organisms. As water demand increases, water sources that require more rigorous pretreatment must be utilized. Polymer membranes are a promising technology for these more rigorous water purification demands, as they selectively transport purified water while rejecting contaminants. Although promising, current membranes face two profound limitations: adhesion and growth of biological films on the membrane, and membrane degradation by chlorine. Both effects reduce membrane performance and increase cost due to the need to clean or replace the membrane. This project will design and test new polymeric membrane materials that retain the performance of commercial membranes, with molecular-level modification of the polymer for increased resistance to fouling by biofilms and decreased degradation by chlorine. Through an integration of macromolecular and process engineering, this project will investigate how molecular level polymeric design impacts processing, microstructure, and separation performance. Poly(arylene ether sulfone) precursors will be modified using post-polymerization modifications to introduce sulfobetaine zwitterions and a series of crosslinkers. The charge and crosslink densities will be optimized to balance hydrophilicity and water sorption versus swelling that leads to a loss of mechanical stability. Then, (anti)fouling mechanisms for the new membranes will be probed, including the role of surface roughness, hydrophilicity, and charge content on protein adhesion. Also, the influence of systematic changes in charge content on physical membrane characteristics will be studied, including water permeability, salt rejection at various salt concentrations and pressure drops, membrane porosity, free volume, morphology, and separation/process costs. Finally, the charge content and processing conditions will be correlated to membrane longevity, specifically structural integrity at various transmembrane pressure drops for asymmetric membranes, resistance to chlorine-mediated oxidative degradation, and long-term fouling studies. One graduate student will be trained in this project and undergraduate students will be involved in the laboratory work. An educational outreach plan is included that will engage the diverse student body of Arizona State University and the surrounding metropolitan community.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.

提供可持续和安全的饮用水是这一代人面临的挑战。对天然水源进行处理以去除盐，有机物和生物生物体。随着水需求的增加，必须使用需要更严格预处理的水源。对于这些更严格的水净化需求，聚合物膜是一项有前途的技术，因为它们在拒绝污染物的同时选择性地运输纯净水。尽管很有希望，但当前的膜面临两个深刻的局限性：生物膜在膜上的粘附和生长，以及氯的膜降解。两种效果都会降低膜性能，并增加由于需要清洁或替换膜而增加的成本。该项目将设计和测试新的聚合物膜材料，以保留商业膜的性能，并通过分子级修饰聚合物，以提高生物膜对结垢的抗性并降低氯的降解。通过将大分子和过程工程的整合，该项目将研究分子水平的聚合物设计如何影响处理，微观结构和分离性能。聚（芳基醚磺基）的前体将使用后聚合修饰进行修饰，以引入硫蛋白酶的s骨和一系列交联。电荷和交联密度将被优化，以平衡亲水性和吸附性与导致机械稳定性损失的肿胀。然后，将探测新膜的（抗）结垢机制，包括表面粗糙度，亲水性和电荷含量在蛋白质粘附上的作用。此外，还将研究系统变化对物理膜特性的影响，包括水的渗透性，各种盐浓度和压降下的盐排斥，膜孔隙率，自由体积，形态和分离/过程成本。最后，电荷含量和加工条件将与膜的寿命相关，特别是在各种跨膜压降下的结构完整性，用于非对称膜，对氯介导的氧化降解的耐药性和长期犯规研究。一名研究生将接受该项目的培训，本科生将参与实验室工作。包括一项教育外展计划，该计划将吸引亚利桑那州立大学的多元化学生团体和周围的大都会社区。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标准来通过评估来获得支持的。