Adolphe, K.S.P.-M. et al. 2015. Kinetics and equilibrium studies of the adsorption of nickel (II) ions from aqueous solution onto modified natural and synthetic iron oxide. International Journal of Basic and Applied Sciences. 4, 3 (Jun. 2015), 277–287. DOI:https://doi.org/10.14419/ijbas.v4i3.4721.