Optimizing Cs-exchange in titanosilicate with the mineral pharmacosiderite topology: framework substitution of Nb and Ge |
| |
Authors: | Akhilesh Tripathi Jose Delgado |
| |
Affiliation: | a Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, TX 77842-3012, USAb Department of Nuclear Engineering, Texas A&M University, College Station, TX 77843-3133, USA |
| |
Abstract: | Titanosilicates with complete or partial substitution of Ge or Nb in the framework and having the mineral pharmacosiderite topology were hydrothermally prepared and their ion-exchange properties towards Cs were studied for Ti/Ge/Si, Ti/Si, Nb/Ti/Si and pure Ge phases. The basis for the differences in the ion exchange properties measured as distribution coefficients (Kd) for these materials are detailed via structural characterization using the Rietveld refinement technique on the X-ray powder diffraction data. The differences in affinity towards Cs+ result either from the degree of hydration of the exchanger resulting in different coordination environments or the position of cesium ion in the eight-ring channel. |
| |
Keywords: | Pharmacosiderite Titanosilicate Germanium Niobium Structure Rietveld analysis Ion exchange Selectivity Distribution constant Cesium ion |
本文献已被 ScienceDirect 等数据库收录! |
|