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DOI: https://doi.org/10.4491/eer.2020.250
Conversion of coconut waste into cost effective adsorbent for Cu(II) and Ni(II) removal from aqueous solutions
Abdul Rahman Abdul Rahim1, Iswarya 1, Khairiraihanna Johari1,2, Nasir Shehzad1,3, Norasikin Saman4, and Hanapi Mat4
1Department of Chemical Engineering, Faculty of Engineering, Universiti Teknologi PETRONAS, 32610 Bandar Seri Iskandar, Perak, Malaysia
2Center of Contaminant Control and Utilization (CenCoU), Chemical Engineering Department, Universiti Teknologi PETRONAS, 32610 Bandar Seri Iskandar, Perak, Malaysia
3Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, Lahore, 54000, Pakistan
4Advanced Materials and Process Engineering Laboratory, Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
Corresponding Author: Khairiraihanna Johari ,Tel: +6053687684, Email: khairiraihana.j@utp.edu.my
Received: May 20, 2020;  Accepted: September 8, 2020.
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ABSTRACT
Desiccated coconut waste (DCW) is an agricultural waste that originates from the coconut milk processing industry. In this study, it was utilized for the removal of copper (Cu(II)) and nickel (Ni(II)) via adsorption process. The physicochemical characterization of the DCW adsorbent shows that the adsorbent have a surface area of 6.63 m2/g, have high elemental carbon content and existences of important functional groups on its surface. The adsorptive capability of DCW adsorbent in removing the heavy metal were conducted in batch studies. DCW adsorbent performed highest Ni(II) and Cu(II) adsorption capacity at pH 6, where equilibrium is achieved at 450 minutes. The kinetic analysis showed the adsorption agreed with pseudo-second order kinetic model, indicating the Cu(II) and Ni(II) adsorption were a chemical adsorption, limited by the film diffusion. The DCW adsorbent still retained its effective adsorption capacity after 2 adsorption-desorption cycles, which is one of the excellent criteria of a good adsorbent for an adsorption process.
Keywords: Adsorbent | Adsorption | Coconut waste | Copper | Nickel | Regeneration
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