US-UK Planning Visit: Anti-Zeolites for Anion Exchange

一个非技术性的合作CNIC的这个建议旨在发起一个新的国际合作之间的奥利弗集团在加州大学圣克鲁斯和福格集团在利物浦大学。他们是世界上极少数专注于以阴离子为模板的阳离子无机材料的团队之一。这个项目将联合收割机这些努力的目标？反沸石？：三维纳米多孔金属氧化物，带有阳离子电荷，可以选择性地捕获污染物阴离子，如铬酸盐，高氯酸盐和高锝酸盐。这一新的合作将使两组的所有研究人员受益匪浅。一名研究生和一名高年级本科生将延长前往利物浦，为两个教育水平的学生提供最先进的培训。这位研究生将在利物浦度过四分之一的时间，他是一个代表性不足的少数民族美国公民。Fogg集团还拥有专业知识，并可以在英国牛津郡的Diamond Light Source进行现场粉末X射线衍射。该数据收集将在对Fogg实验室的长期访问期间进行，以了解合成和阴离子交换的动力学和热力学。这样的理解将使我们能够针对感兴趣的阴离子污染物，并建立材料再利用的可逆性。Fogg是世界上少数几个研究时间分辨原位能量分散X射线衍射以探测环境和水热条件下的动力学、机制和中间体形成的PI之一。这种重要的洞察力将使我们能够优化新材料的合成和交换过程。这两个小组都将通过多种技术参与产品的合成和表征。 污染物捕集技术的进步将对饮用水的净化产生更广泛的影响，这是一个在21世纪将继续增长的关键问题。技术说明反沸石显示出比阴离子交换树脂更大的热稳定性和化学稳定性，并且保持异质性，以便可能的再充电和再利用。迄今为止，金属构建块是Cu、Ag、Er、Yb和Th。该项目的主要目标是实现阳离子，纳米多孔3-D金属氧化物，其中孔径/形状可以通过选择阴离子模板剂进行调整。这种结构控制将类似于沸石（其仅为阴离子，因此仅可交换骨架外阳离子）所实现的结构控制，并允许阴离子的尺寸/形状选择性分离。这两个PI的合成专业知识将被耦合到设计一个合适的阴离子模板，金属源和合成条件，以诱导三维纳米多孔结构。对结构-性质关系的理解将允许使用地球上丰富的金属构建块，如镁、铝或过渡金属。此外，可以调整孔隙率和选择性以用于靶向重金属污染物阴离子以及其他应用，包括由合成框架确定的催化和气体储存。每个小组可用的综合技术将为该项目提供一套前所未有的表征工具。

a non-technical explanationThis CNIC proposal seeks to initiate a new international collaboration between the Oliver group at UC Santa Cruz and the Fogg group at the University of Liverpool. They are two of very few groups worldwide which focus on cationic inorganic materials templated by anions. This project will combine these efforts towards the goal of ?anti-zeolites?: 3-D nanoporous metal oxides that bear a cationic charge and can selectively trap pollutant anions such as chromate, perchlorate and pertechnetate. This new collaboration will greatly benefit all researchers of both groups. One graduate and one senior undergraduate will make extended trips to Liverpool, for state-of-the-art training of students at both educational levels. The graduate student will spend one quarter in Liverpool and is an underrepresented minority U.S. citizen. The Fogg group also has expertise and access to in situ powder X-ray diffraction at the Diamond Light Source in Oxfordshire, England. This data collection will be conducted during extended visits to the Fogg lab for understanding the kinetics and thermodynamics of both the synthesis and anion-exchange. Such understanding will allow us to target anionic pollutants of interest and establish reversibility for reuse of the materials. Fogg is one of only a handful of PIs worldwide that studies time resolved in-situ energy dispersive X-ray diffraction to probe the kinetics, mechanism and intermediate formation under both ambient and hydrothermal conditions. This essential insight will allow us to optimize the synthesis and exchange processes of the new materials. Both groups will be involved in the synthesis and characterization of the products by multiple techniques. Advances into pollutant trapping would have broader impact on the purification of potable water, a critical issue that will continue to grow in the 21st century.a technical description Anti-zeolites show greater thermal and chemical stability than anion exchange resins, and remain heterogeneous for possible recharge and reuse. To date, the metal building blocks have been Cu, Ag, Er, Yb and Th. The major goal of this project will be to realize cationic, nanoporous 3-D metal oxides where the pore size/shape can be tuned via choice of anion templating agent. Such control of structure would be analogous to that achieved for zeolites (which are only anionic, so can only exchange extra-framework cations) and allow size/shape selective separation of anions. The synthetic expertise of the two PIs will be coupled to design a suitable anionic template, metal source and synthetic conditions to induce a 3-D nanoporous structure. An understanding of the structure-property relationships would allow the earth abundant metal building blocks to be used such as magnesium, aluminum or transition metals. In addition, the porosity and selectivity could be tuned for targeting heavy metal pollutant anions as well as other applications including catalysis and gas storage as determined by the synthesized frameworks. The combined techniques available to each group will give the project an unprecedented suite of characterization tools.