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The aim of this research work is to investigate sorption characteristic of polypyrrole coated on the sawdust (PPy/SD) for the removal of NO 3− from aqueous solutions and wastewater. The sorption of NO 3− is carried out by batch method. The optimum conditions of sorption were found to be: a sorbent dose of 0.6g in 100ml of NO 3− solution, contact time of 20min...