Cation Separations Using New Swelling Micas

建议类型：CTS-9911580建议类型：调查者发起-更新主要研究人员：Sridhar KomarneniInstitution：宾夕法尼亚州立大学标题：阳离子分离使用新的膨胀胶团本项目的目标是经济高效地合成理论交换容量分别约为230和345meq/100g的Na-2-云母和Na-3-云母，通过包括27Al和29Si MASNMR在内的一系列技术表征物相，并研究它们的实际阳离子交换能力和平衡(选择性)。将在合成云母上确定Sr2+、Ra2+、Ba2+、Cs+、Cu2+和Pb2+等离子的交换平衡。新型Na-2-云母和Na-3-云母交换剂的结构将通过27Al和29Si魔角旋转核磁共振波谱确定，以便将它们的结构与它们的性能(选择性)联系起来。我们还将研究这些材料在实际应用中的酸稳定性和温度稳定性，以及通过改变温度、pH等和络合作用对铜等选定金属的可逆回收。研究结果将有助于对新型溶胀云母离子交换行为的基本理解。这类材料提供了潜在的重要废物处理应用，例如用于分离和固定放射性离子和其他危险离子的高离子选择性。在这里获得的基础知识还可能导致在从溶解的矿石或废水中回收金属、催化以及废物修复过程中的应用。例如，这里开发的材料可能被用作可渗透的反应性墙，用于捕获放射性离子和其他危险离子，但传输清洁的水。

ABSTRACTProposal No.: CTS-9911580Proposal Type: Investigator Initiated - RenewalPrincipal Investigators: Sridhar KomarneniInstitution: Penn State UniversityTitle: Cation Separations Using New Swelling MicasThe objective of this project is to synthesize cost-effectively Na-2-mica and Na-3-mica with theoretical exchange capacities of about 230 and 345 meq/100g, respectively, to characterize the phases by a battery of techniques including 27Al and 29Si MASNMR spectroscopy, and to investigate their actual cation exchange capacities and equilibria (selectivity). Exchange equilibria will be determined on synthetic micas for ions such as Sr2+, Ra2+, Ba2+, Cs+, Cu2+ and Pb2+. The structures of the novel Na-2-mica and Na-3-mica exchangers will be determined by 27Al and 29Si magic-angle spinning nuclear magnetic resonance spectroscopy in order to relate their structures to their properties (selectivities). We will also investigate the acid and temperature stability of these materials for practical applications and the reversible recovery of selected metals such as Cu by changing temperature, pH, etc., and by complexation. The results of the study should contribute much to basic understanding of the ion-exchange behavior of novel swelling micas. Such materials offer potentially important waste-disposal applications, such as high ion selectivity for separation and fixation of radioactive and other hazardous ions. The fundamental knowledge gained here may also lead to applications in metals recovery from solubilized ores or waste water, in catalysis, as well as in waste remediation processes. For example, the materials developed here might be used as permeable reactive walls that trap radioactive and other hazardous ions but transmit clean water.