A series of Fe–Mn binary oxides with different Fe:Mn ratios (1:1, 3:1, 6:1, 9:1) were synthesized to investigate the optimal Fe:Mn ratio for the removal of As(III) and As(V). Batch experiments were performed to determine the rate of adsorption and equilibrium isotherms. Adsorption kinetics were well described by the pseudo-second-order kinetic model for both As(III) and As(V). The adsorption equilibrium data fitted well to Langmuir and Freundlich isotherms. The maximum As(V) sorption capacity was observed at an Fe:Mn ratio of 6:1 (65.0 mg/g), whereas maximum As(III) uptake was at Fe:Mn ratio 3:1 (46.9 mg/g). Arsenic levels in real water samples were reduced from 37 μg/l to below the EU Water Framework Directive limit (10 μg/L) after treatment with Fe–Mn adsorbents.
Adsorption mechanism of As(V) and As(III) on Fe–Mn binary oxides in synthetic and real water matrices
Jasmina Nikić, Jasmina Agbaba, Malcolm Watson, Snežana Maletić, Jelena Molnar Jazić, Božo Dalmacija; Adsorption mechanism of As(V) and As(III) on Fe–Mn binary oxides in synthetic and real water matrices. Water Science and Technology: Water Supply 1 August 2016; 16 (4): 992–1001. doi: https://doi.org/10.2166/ws.2016.015
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