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ARSENATE AND ANTIMONATE ADSORPTION ON NATURAL MATERIALS
Abstract
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-. Arsenate (AsO43-) and antimonate (Sb(OH)6-) showed a significantly higher adsorption affinity to the adsorbents with a higher pH of zero charge (pHZPC), specifically HFO, birnessite, and Fe/Mn modified adsorbents. The adsorption yield reached maximum values (99%) for the adsorbents with a high natural content of Fe/Mn (HFO, birnessite), and about 70-95% for Fe/Mn modified materials (zeolite and biochar). In any event, arsenate (AsO43-) was more intensively adsorbed compared to antimonate (Sb(OH)6-), with an increase of 3-15%.
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