Due to the high cost of activated carbon as an adsorbent, there is a growing interest in a search of alternative sustainable adsorbents. The objective of this study is to investigate the potential use of fuller’s earth (a solid waste from vegetable oils industry) as an adsorbent for chromium and nickel ions. The adsorption is investigated under different experimental conditions referring to the initial concentration (2 - 12 mg/L), the adsorbent dose (0.15 - 1.8 g/L), and the contact time (0 - 360 min). The adsorption kinetics is examined using the pseudo first order, the pseudo second order, the Elovich, the intraparticle diffusion, and the Boyd models. The equilibrium is attained within 240 min. The adsorption of chromium and nickel ions is found to have a chemical nature as revealed by... the Elovich and the pseudo second order models. The results obtained show that the adsorption mechanism of chromium ions refers predominantly to intraparticle diffusion, while both intraparticle diffusion and film diffusion are found to control the adsorption of nickel ions.