Adsorption studies of caesium on zirconium molybdoarsenate (ZrMAs)

The applicability of zirconium molybdoarsenate (ZrMAs) for efficient remova l of Cs from aqueous solution by adsorption has been investigated. The kine tics of adsorption of caesium ions has been studied by using radioanalytica l procedure over a concentration range (10(-4)-10(-2) mol dm(-3)) and in th e temperature range (303-318 K). The results showed that the uptake follows the first order rate law with respect to caesium concentration and obeys L angmuir and Modified Freundlich adsorption isotherms in the concentration s tudied. The effect of temperature on adsorption equilibrium has been studie d and the thermodynamic quantities (Delta H degrees, Delta G degrees and De lta S degrees) has been evaluated. They showed that the process is exotherm ic in nature. (C) 1999 Elsevier Science Ltd. All rights reserved.