1. Department of Chemical Engineering, Faculty of Engineering and Technology, University of Ilorin, Ilorin, P. M. B. 1515, Nigeria (Corresponding author), e-mail: adeniyi.ag@unilorin.edu.ng, http://orcid.org/0000-0001-6615-5361
2. Department of Chemical Engineering, Nnamdi Azikiwe University, P. M. B. 5025, Awka, Nigeria (Corresponding author), e-mail: oshea.ighalo@yahoo.com, http://orcid.org/0000-0002-8709-100X