Abstract
Zeolites exchanged with Eu3+ ions were prepared based on three kinds of zeolite hosts: A zeolite, X zeolite, and Y zeolite. The 152Eu Mössbauer effect was used to study the coordination properties of Eu3+ ions in these zeolites. The results showed that EU3+ ions occupy two sites where the electric-field gradient tensors are axially symmetric. The isomer shift and quadrupole splitting of Mössbauer spectra of Eu depend on the electronegativity of the zeolite hosts. With moderate conditions (less than 720°C), the Eu3+ ions in the three kinds of zeolites were reproduced to Eu2+ ions. The coordination property and the stability of the Eu2+ were also studied with 151Eu Mössbauer effect spectroscopy. The results indicated that the symmetry of the electric-field gradient at the Eu site is lowered.
Original language | English (US) |
---|---|
Pages (from-to) | 600-602 |
Number of pages | 3 |
Journal | Zeolites |
Volume | 14 |
Issue number | 7 |
DOIs | |
State | Published - 1994 |
Keywords
- Eu Mössbauer effect
- Eu cation
- Zeolite
ASJC Scopus subject areas
- Environmental Science(all)