engleski

Adsorption Characteristics of Different Adsorbents and Iron(III) Salt for Removing As(V) from Water

The aim of this study was to determine adsorption performance of two adsorbents for removal of As(V) from water: Bayoxide® E33 (granular ferric oxide), Titansorb® (granular titanium oxide) and a suspension of precipitated iron(III) hydroxide. Results on As(V) adsorption stoichiometry for two adsorbents and precipitated iron(III) hydroxide in tap and demineralized water were fitted to Freundlich and Langmuir adsorption isotherm equations, from which adsorption constants and adsorption capacity were calculated. The separation factor RL for the three adsorbents ranged from 0.04 to 0.61, indicating effective adsorption. Precipitated iron(III) hydroxide showed the greatest capacity for adsorbing As(V), while Titansorb showed the lowest. Comparison of adsorption from tap or demineralized water showed that Bayoxide and precipitated iron(III) hydroxide had higher adsorption capacity in demineralized water, whereas Titansorb showed a slightly higher capacity in tap water. These results provide mechanistic insights into how commonly used adsorbents remove As(V) from water.

Arsenic removal ; drinking water ; adsorption

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