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Powder XRD Study of Changes of Cd 2+ Modified Clinoptilolite at Different Stages of the Ion Exchange Process.

Authors :
Dimowa, Louiza
Tzvetanova, Yana
Source :
Minerals (2075-163X). Oct2021, Vol. 11 Issue 10, p1130-1130. 1p.
Publication Year :
2021

Abstract

Cadmium exchange on clinoptilolite is performed and structurally studied for different durations of the ion exchange process (2 h, 24 h, 72 h, 168 h, 12 days, 22 days) at room temperature and 90 °C. The distribution of Cd2+ ions in all samples is elucidated after exchange on clinoptilolite using powder XRD data processed by Rietveld structural software. Clinoptilolite is not selective for cadmium cations, but at 90 °C the exchange is ~2.5 cations per unit cell. At RT it reaches ~1.25 cations per unit cell being twice as low. The obtained maximum exchanged sample for 22 days 90 °C was structurally refined in order to find the cadmium positions in the clinoptilolite voids. The structural refinements of the occupations of the incoming and outgoing cations give an idea of how the intracrystalline diffusion is processed. A good correlation between results obtained by structural refinement of the Cd-exchanged samples and the data of the EDS measurements was achieved. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
2075163X
Volume :
11
Issue :
10
Database :
Academic Search Index
Journal :
Minerals (2075-163X)
Publication Type :
Academic Journal
Accession number :
153341033
Full Text :
https://doi.org/10.3390/min11101130