SPECIFIC ADSORPTION OF CESIUM ON SILICA-TITANIA

Authors
VENKATESAN KA SASIDHARAN NS WATTAL PK
Citation
Ka. Venkatesan et al., SPECIFIC ADSORPTION OF CESIUM ON SILICA-TITANIA, Journal of radioanalytical and nuclear chemistry, 222(1-2), 1997, pp. 223-226
Citations number
20
Categorie Soggetti
Chemistry Inorganic & Nuclear","Chemistry Analytical","Nuclear Sciences & Tecnology
Journal title
Journal of radioanalytical and nuclear chemistry → ACNP
ISSN journal
02365731
Volume
222
Issue
1-2
Year of publication
1997
Pages
223 - 226
Database
ISI
SICI code
0236-5731(1997)222:1-2<223:SAOCOS>2.0.ZU;2-L
Abstract
The amphoteric nature of hydrous silica-titania gel and its sorption b ehaviour towards cesium were studied. In NaNO3 solution, the point of zero charge (pH(pzc)) of the gel was found to be 4.22 by pH-titration. The fraction of protonated, deprotonated and neutral surface hydroxyl groups as a function of pH have been computed. Sorption of cesium inc reased with the increase of pH, reached maximum at a pH of 7 followed by a plateau. Significant uptake of cesium was observed even when the pH was less than pH(pzc). Nearly 70% sorption was observed at pH(pzc). The free energy of specific adsorption was found to be -18.7 kJ . mol (-1).