Cation Separations Using New Swelling Micas

ABSTRACTProposal没有。项目编号：csts -9911580项目类型：研究员发起-续签主要研究员：Sridhar komareni机构：宾夕法尼亚州立大学本项目的目的是经济有效地合成理论交换容量分别为230和345 meq/100g的na -2-云母和na -3-云母，通过包括27Al和29Si MASNMR光谱的一系列技术来表征它们的相，并研究它们的实际阳离子交换容量和平衡（选择性）。在合成云母上测定了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来确定，以便将它们的结构与它们的性质（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和温度稳定性，以及通过改变温度、pH等和络合来可逆回收选定的金属，如Cu。研究结果将有助于对新型膨胀云母离子交换行为的基本认识。这种材料具有潜在的重要废物处理用途，例如对分离和固定放射性离子和其他危险离子具有高离子选择性。在这里获得的基本知识也可能导致从溶解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，这里开发的材料可以用作可渗透的反应壁，它可以捕获放射性和其他有害离子，但可以传输干净的水。

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.