The objective of this study is the removal of chromium from tannery wastewater by electrosorption on carbon prepared from lignocellulosic natural residue "peach stones' thermally treated. The followed steps for obtaining coal in chronological order were: cleaning, drying, crushing and finally its carbonization at 900°C. The characterization of the carbon material resulted in properties comparable to those of many coals industrially manufactured. The study of the dynamic adsorption of chromium on the obtained material resulted in a low removal rate (33.7%) without applied potential. The application of negative potentials of -0.7 V and -1.4 increases the adsorption of chromium up to 90% and 96% respectively. Whereas a positive potential of +1.4V allows desorption of the contaminant of 138%.

• Mounir Ziati(Laboratory of Soft Technologies, Physico-Chemical Valorization of Biological Materials and Biodiversity, Department of Chemistry,Faculty of Sciences, M’hamed Bougara University, Boumerdes 35000, Algeria. Laboratory of Water Treatment and Valorization of Industrial Waste, Department of Chemistry, Faculty of Sciences, Badji Mokhtar University, BP12, Annaba 23000, Algeria) Corresponding Author
• Fariza Khemmari(Food Technology Laboratory, Department of Environmental Engineering, Faculty of Engineering Sciences, M’hamed Bougara University, Boumerdes 35000, Algeria)
• Mohamed Kecir(Mineral and Energy Resources Laboratory, Department of Mining and Oil Deposits, Faculty of Hydrocarbons and Chemistry, M’hamed Bougara University, Boumerdes 35000, Algeria)
• Sabir Hazourli(Laboratory of Water Treatment and Valorization of Industrial Waste, Department of Chemistry, Faculty of Sciences, Badji Mokhtar University, BP12, Annaba 23000, Algeria)