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Isotherm, kinetics, and thermodynamics of arsenic(III) adsorption onto
activated carbon

Journal of Environment & Biotechnology Research, Vol. 6, No. 1, Pages 179-185, January 2017

Olushola S. Ayanda, Dosu Malomo, Kehinde O. Sodeinde, Oyebamiji Oyedele Oketayo, Omowumi
Nimat Abdulazeez

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ABSTRACT

Activated carbon was used as adsorbent for the removal of As(III) ions in the present study. The experiment was
carried out as a function of the initial As(III) concentration, adsorbent dose, contact time, solution pH, and
temperature. The optimal percentage removal of As(III) ions achieved by the activated carbon was found to be
approximately 50.0% when 25 mL of 100 mg/L As(III) solution was contacted with 2.5668 g of activated carbon for
120 min at 120 rpm. The kinetic study showed that the experimental data fitted well with the pseudo-second
order kinetic model, while the equilibrium study showed that the adsorption of As(III) onto activated carbon
described well by the Langmuir isotherm. The adsorption of As(III) onto activated carbon was exothermic with ΔS0
and ΔH0 approximately equals -83.04 J/K/mol and -23.29 kJ/mol, respectively.
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Journal of Environment and Biotechnology Research
Volume 6, Number 1, 2017, pp. 179-185
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