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Arsenic (As) and antimony (Sb) are highly toxic, carcinogenic elements from the same group of periodic system. They occur naturally as oxyanions, predicting their affinity to anionactive adsorbents in aqueous environment. The differences in adsorption properties of arsenate (AsO43-) and antimonate (Sb(OH)6-) were tested on natural adsorbents (zeolite, biochar, birnessite, hydrated ferric oxides - HFO) in their original and iron (Fe) or manganese (Mn) - modified forms, using the model solutions of AsO43- and SbO43-...