A study on the adsorption of As(III) from aqueous solution by activated red mud
Abstract
In the present work, activated red mud was used as low-cost adsorbent of As(III) from aqueous solution. The red mud was characterized by physico-chemical methods including X-ray diffraction (XRD), scanning electron microscopy (SEM) and particle distribution. As(III) adsorption process from aqueous solution onto activated red mud was investigated. With adsorption dosage of 1,5 g.L-1 and at suitable pH of 8, more than 79 % of As(III) was removed from aqueous solution containing 50 mg As(III).L-1. Adsorption isotherm study confirmed Langmuir model well described the experimental data and maximum monolayer adsorption capacity was about 29.4 mg.g-1. The kinetic data were followed pseudo second-order model. The negative value of Gibbs free energies proved that the adsorption was a spontaneous process. The endothermic nature of the adsorption was demonstrated by the positive values of standard enthalpy.
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