Kinetic And Thermodynamic Aspects Of
Arsenic (III) Adsorption Onto Iron Oxide
Obtained From Iron Oxalate
Author(s)
A. Negrea, M. Ciopec, L. Lupa, C. Muntean, R. Lazau
& P. Negrea
Abstract
Drinking water has been identified as one of the major sources of arsenic
exposure by the general population. A variety of treatment processes has been
studied for arsenic removal from water. One of the most used methods is
adsorption. The most efficient adsorbent materials are those with iron content
considering the affinity of arsenic towards iron. Relatively limited information is
available regarding the impact of temperature on the arsenic (As) (III) adsorption
kinetic and equilibrium capacities on iron oxide. In this paper we studied the
possibility of using iron oxide as an adsorbent for the removal of As (III) from
aqueous solutions. The iron oxide was obtained through annealing of iron
oxalate at 550°C. The effects of contact time, initial concentration of the
solutions and temperature on the removal of As (III) were investigated in order
to explain the adsorption mechanism. The kinetic of As (III) adsorption can be
described well by the pseudo-second-order models. The equilibrium adsorption
data were fitted using Freundlich and Langmuir isotherm equations and the
corresponding parameters were calculated and discussed in detail. An increase in
temperature increases the values of the overall adsorption reaction rate constant.
An examination of thermodynamic parameters shows that the adsorption of
As (III) by iron oxide is an endothermic process and is spontaneous at the
specific temperature investigated.
Keywords: arsenic, adsorption, iron oxide, kinetic, thermodynamic.
Keywords
arsenic, adsorption, iron oxide, kinetic, thermodynamic
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