A reasonably priced and easily available natural bentonite was used to remove Mn(VII) ion from polluted water. The purpose of this research is to investigate the structural and adsorption capacity changes of microwave-treated bentonite following Mn(VII) ion adsorption. The two forms of bentonite (natural and microwave-assisted) were characterized with respect to the chemical composition and structural morphology (XRD, EDX and FTIR) in addition to pore size distribution and surface area. The structure of the microwave-treated bentonite showed partial damage of the framework of silica, and new surface nucleation centers are developed during microwave treatment. Montmorillonite was deemed to be the prevailing phase. The total surface area and the average pore size distribution were changed from (277,624 m