This work explores the potential of Antigonon leptopus leaf powder for the biosorption of manganese ions from aqueous solutions. The biosorption of metal ions by Antigonon leptopus leaf powder was found to be pH-dependent, with optimum sorption occurring at pH≈ 6 for Mn. The biosorption mechanism by Antigonon leptopus leaf powder was identified as the biosorption of metal ions onto the surface of biosorbent particles, which was confirmed by...