Cation Separations Using New Swelling Micas

使用新型膨胀云母分离阳离子

• 批准号: 9911580
• 负责人: Sridhar Komarneni
• 金额: $ 12万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-04-01 至 2003-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9911580&HistoricalAwards=false
• 关键词: Cation; Separations; Using; New; Swelling

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.

摘要提案编号： CTS-9911580提案类型：研究者发起-更新主要研究者：Sridhar Komarneni机构： 宾夕法尼亚州立大学 本项目的目标是合成具有成本效益的Na-2-云母和Na-3-云母，其理论交换容量分别为约230和345 meq/100 g，通过一组技术（包括27 Al和29 Si MASNMR光谱）来表征相，并研究它们的实际阳离子交换容量和平衡（选择性）。 将在合成云母上测定Sr 2+、Ra 2+、Ba 2+、Cs+、Cu 2+和Pb 2+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魔角旋转核磁共振光谱来确定，以将它们的结构与它们的性质（选择性）相关联。 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值等可逆回收所选金属，如Cu，和络合作用。 本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。 这些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和其他有害离子的高离子选择性。 在这里获得的基础知识也可能导致在金属回收溶解的矿石或废水中的应用，在催化，以及在废物修复过程。 例如，这里开发的材料可以用作可渗透的反应墙，捕获放射性和其他有害离子，但传输清洁水。