<p>The sorption of ¹⁶⁰Tb from aqueous solutions using MnO₂-alginate composite is the main objective of this work. MnO₂-alginate composite was fabricated by immobilizing MnO₂ in alginate, then characterized using many analytical techniques as FT-IR, XRD, SEM, and EDX. The impact of time, pH, initial metal concentrations, ionic strength and temperature on ¹⁶⁰Tb sorption were explored. As well as desorption, and recycling were also investigated. The data showed that the saturation capacity had values of 168.06 and 240.17 mg/g for MnO₂ and MnO₂-alginate composites, respectively. The sorption of ¹⁶⁰Tb was dependent on pH and independence of ionic strength. Isotherms were more pertinent to Langmuir isotherm model and the reaction kinetics followed the pseudo-2^nd-order model. Desorption of ¹⁶⁰Tb from the loaded MnO₂-alginate was done using different eluents and the highest elution 93.39% was attained using 0.1 M HCl. The recycling results indicated that the MnO₂-alginate composite could be reused for repeated sorption-desorption regeneration cycles up to twenty cycles with a low reduction in the uptake percentage. The excellent recycling results reveal the applicability of the MnO₂-alginate composite used as an effective sorbent for sorption of ¹⁶⁰Tb from aqueous media.</p>