IIARD International Institute of Academic Research and Development

INTERNATIONAL JOURNAL OF CHEMISTRY AND CHEMICAL PROCESSES (IJCCP )

E-I SSN 2545-5265
P- ISSN 2695-1916
VOL. 9 NO. 3 2023

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Investigation of the Adsorption of Arsenic by Acid Modified Cassava Peels (Manihot esculenta)

N. J. Maduelosi, F. Chuku and O. P. Godfrey-Maate

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Abstract

Removal of heavy metal ions present in water has been a challenge owing to the high cost of existing technologies. In this study, natural material (cassava peel) modified with acid was used to determine the feasibility of the removal of arsenic. Cassava peel (Manihot esculenta) is considered as a waste which in turn is seen as a form of environmental nuisance in many countries of the world. Arsenic is a naturally occurring heavy metal considered to be very toxic and poisonous to man and his environment. In this study, the adsorption of arsenic by acid modified cassava peel was carried out using the batch adsorption method. The effects of pH, contact time, adsorbent dosage and concentration on the adsorption of arsenic from an aqueous solution were investigated. The results showed that the highest adsorption efficiency was obtained at pH 4.0 with 0.2 g adsorbent dosage at 10ppm initial concentration with a contact time of 60 minutes. Adsorption of arsenic from the solution by the acid modified cassava peels decreased with increase in pH and adsorbent dosage, but it increased with increase in contact time. The results also showed that as the adsorbate concentration increased, the rate of adsorption of the arsenic metal ion decreased. These observations are attributed to the presence of active binding sites or functional groups in the cassava peel. The isotherm data were fitted into the Langmuir model. It can therefore be said that acid modified cassava peels can be used as an adsorbent for the removal of arsenic compounds in an aqueous solution

keywords:

Adsorption, Arsenic, pH, dosage, cassava peels, adsorbent, isotherm

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