Kinetic and thermodynamic studies of sorption of lead and cadmium from aqueous solution by Moringa oleifera pod wastes Online publication date: Mon, 06-Jan-2020
by Folahan Adekola; Haleemat Adegoke; Oluwaseun Arowosaiye; Gabreal Olatunji
International Journal of Environment and Waste Management (IJEWM), Vol. 25, No. 1, 2020
Abstract: Equilibrium sorption of Pb(II) and Cd(II) from aqueous solution by Moringa oleifera pods waste was conducted under batch conditions. Effects of operating variables such as initial concentration, contact time, adsorbent dose, pH and temperature on the sorption of these heavy metals have been studied. The optimum pH for the adsorption was found to be 5.0 and the adsorption process was found to be exothermic for both metal ions. The competitive adsorption characteristics of the combinations of binary mixtures of aqueous metal ion species, Pb2+ (aq) and Cd2+ (aq), on the adsorbent were also investigated. The Langmuir, Freundlich, Temkin and Dubinin Radushkevich adsorption isotherm models were used to analyse the equilibrium data. Kinetics data evaluation showed that the adsorption followed a pseudo-second order model. A solution of 0.05 M HCl has been found to be sufficient for the regeneration of spent adsorbent with up to 90% recovery for the two metal ions.
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Environment and Waste Management (IJEWM):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email subs@inderscience.com