Abstract
The iron/manganese oxides modification biochar (Mn/Fe-biochar) is prepared by pyrolysis of RS impregnated with KMnO4 and Fe(NO3)3 for Pb(II) and Ag(I) removal from wastewater. Pb(II) and Ag(I) adsorption process on Mn/Fe-biochar are exactly analyzed using the Pseudo-second order and Hill model. Pb(II) and Ag(I) adsorption capacity of Mn/Fe-biochar are 88.49 and 134.80 mg/g based on Hill model, respectively. Adsorption thermodynamics analysis indicates the feasible and spontaneous Pb(II) and Ag(I) adsorption on Mn/Fe-biochar. Adsorption mechanism analysis indicates that π-π interaction and surface functional groups contribute to Pb(II) and Ag(I) removal. Density functional theory calculation indicates that binding energies of Pb(II) and Ag(I) interactions with -Mn-O group are the largest than that of the -OH, -COOH, -Fe-O groups, indicating that -Mn-O group plays an important role in Pb(II) and Ag(I) adsorption process. Reusability analysis indicates that Mn/Fe-biochar still has high Pb(II) and Ag(I) adsorption capacity after three cycles. The preliminary economic analysis indicates that the production cost of the Mn/Fe-biochar is estimated as the $4.94/1 kg.
Published Version
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