Arsenic(III) removal performances in the absence/presence of groundwater occurring ions of agglomerated Fe(III)-Al(III) mixed oxide nanoparticles

Performances of As(III) adsorption by agglomerated nanoparticles of calcined (250 degrees C) hydrous Fe(III)-Al(III) mixed oxide (NHIAO-250 degrees C) were investigated at 30 degrees C and pH 7.0 in the absence/presence of background ions occurring in groundwater. Kinetics and equilibrium data described, respectively, the pseudo-second order and the Langmuir isotherm equations well. Higher (15-35%) monolayer capacity (58.30 +/- 3.15 mg g(-1)) of As(III) system in absence of any background ions implied the adverse influence of the incorporated ions over As(III) sorption. Increased entropy (positive Delta S degrees) was responsible for the endothermic reactions (positive Delta H degrees) and spontaneous nature (Delta G degrees = negative). Thomas model described the fixed-bed breakthrough curves of As(III) removal from spiked groundwater well. (C) 2011 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.