The current work reports adsorption of Ni(II) using Brassica botrytis leaves (BBL), leaves-activated carbon (BBL-AC), Lycopersicon esculentum peel (LEP) and peel-activated (LEP-AC). was tested in batch experiments by varying different parameters such as pH, initial metal ion concentration, temperature, adsorbent dosage, contact time. Thermodynamics kinetics investigations were performed for Ni ...