Biosorption characteristics of ammonium from aqueous solutions onto Posidonia oceanica (L.) fibers

► P. oceanica have high ammonium adsorption capacity. ► P. oceanica can be considered as a promising material for nitrogen adsorption. ► Ammonium adsorption by P. oceanica is essentially chemical. ► Ammonium adsorption by P. oceanica is done by ion exchange and complexation.