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Title: Synthesis and characterization of a novel layered tin(IV) phosphate with ion exchange properties

A novel layered tin(IV) phosphate, Sn(NH{sub 4}PO{sub 4})(HPO{sub 4}){center_dot}2H{sub 2}O ({delta}-SnP-NH{sub 4}), was synthesized under mild hydrothermal conditions (190 C) in the presence of urea. The treatment of this compound with mineral acids gave a new phase of tin(IV) bis(monohydrogenphosphate), Sn(HPO{sub 4}){sub 2}{center_dot}3H{sub 2}O ({delta}-SnP-H). The layered nature of the solid was confirmed from amine intercalation, exfoliation in alkaline media, and the ion exchange behavior towards alkali and alkaline earth ions. High affinity (K{sub d}{sup Cs} {approximately} 5 {times} 10{sup 4} to 2 {times} 10{sup 5} mL g{sup {minus}1}) and capacity (160--200 mg Cs{sup +} per g of exchanger) for Cs{sup +} makes these materials promising for selective radioactive cesium removal from contaminated groundwater and nuclear waste.
Authors:
; ;  [1] ;  [2] ; ;  [3]
  1. Texas A and M Univ., College Station, TX (United States). Dept. of Chemistry
  2. Texas A and M Univ., College Station, TX (United States). Dept. of Chemistry|[Univ. de Oviedo (Spain). Dept. de Quimica Organica e Inorganica
  3. Univ. de Oviedo (Spain). Dept. de Quimica Organica e Inorganica
Publication Date:
OSTI Identifier:
684412
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 34; Journal Issue: 6; Other Information: PBD: Apr 1999
Sponsoring Org:
Comision Interministerial de Ciencia y Tecnologia (Spain);USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 05 NUCLEAR FUELS; PHASE STUDIES; CHEMICAL PREPARATION; TIN PHOSPHATES; RADIOACTIVE WASTE PROCESSING; LAYERS; ION EXCHANGE; GROUND WATER