The objectives of this study are the thermal remediation of bentonite waste to convert non-hazardous material, and the use of the obtained thermal recycling bentonite waste (TRBW) as ‎a novel low-cost adsorbent for the removal of heavy metals from aqueous solution using the ‎batch system. The origin of bentonite waste is a by-product from plants of spent engine oil ‎recycling [PSEOR]. It was remediated in two stages, directly burning and in the electrical ‎furnace at 700 Cᵒ for 100 minutes to eliminate oil residues and impurities. The tests of XRD, ‎BET, FTIR, EDX, and SEM were accomplished to identify the chemical and physical ‎characteristics of TRBW. After then, the examination of the ability of TRBW to adsorption ‎of the five heavy metals (Zn, Ni, Cd, Cr, and Pb) with different experimental parameters such ‎as initial concentration, adsorbent dose, temperature, pH, and contact time. Different models ‎of isotherm, kinetic, and thermodynamic were utilized and the results indicate that the nature ‎of heavy metals adsorption onto TRBW was homogeneous. According to the maximum ‎adsorption capacities, the metals ranked as Pb> Cd> Zn> Cr> Ni, and adsorption capacities ‎were 94.97, 73.85, 39.56, 38.34, and 36.33 mg/g, respectively.‎