Removal of Hexavalent Chromium from Aqueous Solution by Adsorption on Palm Oil Fuel Ash (POFA)

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Removal of Hexavalent Chromium from Aqueous Solution by Adsorption on Palm Oil Fuel Ash (POFA)

Abstract

This study investigated the removal of hexavalent chromium, Cr(VI) from aqueous solution by adsorption using palm oil fuel ash (POFA), an agricultural waste from the palm oil industry. POFA adsorbent was characterized by X-ray diffraction (XRD) analysis. Batch adsorption study revealed that the optimum conditions for the removal were as follows: pH 2, adsorbent dosage 80 g/L and contact time of 6 min, which resulted in 92% removal and 0.464 mg/g maximum adsorption capacity. Adsorption isotherm and kinetic studies showed that Freundlich isotherm and pseudo-second-order kinetic models fit-

Published: February 20, 2020 ted best to the experimental data. Column adsorption study at 5 mL/min of

Copyright © 2020 by author(s) and flow rate showed that 90% removal was obtained at 2 min of contact time Scientific Research Publishing Inc. which represented its breakthrough point. The column reached saturation at This work is licensed under the Creative 30 min and the maximum column adsorption capacity recorded was 0.412 Commons Attribution International mg/g. The column adsorption behavior showed good fit with both Thomas License (CC BY 4.0). and Yoon-Nelson kinetic models. These findings suggested that the utilizahttp://creativecommons.org/licenses/by/4.0/

tion of POFA as a low-cost adsorbent to remove Cr(VI) from wastewater, either

in batch or fixed bed adsorption system is not only effective, but concurrently will help to reduce wastes from the palm oil industry.

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