Studies on Mg/Fe Hydrotalcite-Like-Compound (HTlc): I. Removal of Inorganic Selenite (SeO32−) from Aqueous Medium

A Mg/Fe hydrotalcite-like-compound (HTlc) was prepared and its affinity toward the removal of SeO32− from an aqueous medium was studied as a function of pH, time, temperature, particle dose, and SeO32− concentration. The fraction of SeO32− removal increases with decrease in both pH and temperature....

Full description

Saved in:
Bibliographic Details
Published in:Journal of colloid and interface science 2002-07, Vol.251 (1), p.26-32
Main Authors: Das, J., Das, D., Dash, G.P., Parida, K.M.
Format: Article
Language:English
Subjects:
Adsorption
Aluminum Hydroxide - chemistry
aqueous selenite
Chemistry
Entropy
Exact sciences and technology
General and physical chemistry
Hydrogen-Ion Concentration
Iron - chemistry
Magnesium - chemistry
Magnesium Hydroxide - chemistry
Mg/Fe HTlc
Sodium Selenite - chemistry
Solid-liquid interface
Surface physical chemistry
Water Pollutants, Chemical - chemistry
Water Purification
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A Mg/Fe hydrotalcite-like-compound (HTlc) was prepared and its affinity toward the removal of SeO32− from an aqueous medium was studied as a function of pH, time, temperature, particle dose, and SeO32− concentration. The fraction of SeO32− removal increases with decrease in both pH and temperature. The adsorption data are fitted to the Langmuir adsorption isotherm in the temperature range 303–333 K, and the thermodynamic parameters viz. standard Gibbs' free energy change (ΔG°), enthalpy change (ΔH°), and entropy change (ΔS°) are calculated. The negative value of ΔH° indicates that the adsorption process is exothermic. The apparent equilibrium constants (Ka) are also calculated and found to decrease with increase in temperature.
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.2002.8319