Biosorption of Pb2+, Cr3+, and Cu2+ by peach palm sheath modified colonized by Agaricus Blazei

AbstractIn this study, the behavior of lead (Pb2+), chromium (Cr3+), and copper (Cu2+) ions in several aqueous solutions during biosorption of peach palm sheath colonized with Agaricus blazei (PS + A. blazei) was evaluated. The modifications of the chemical structure of the biosorbent due to fungal growth were verified by scanning electronic microscopy (SEM) which showed the differences on the material surface. Biosorption of Pb2+ and Cr3+ was dependent of solution pH. Although in natura peach palm sheath and peach palm sheath with A. blazei growth have shown different behaviors in pH evaluations for the three metals, it was chosen to use pH 5.0 in all the other experiments due to the high biosorption values for all metal/biosorbent relations when compared to other pH values. The reaction reached equilibrium in 15 min and the pseudo-second-order model presented the best results for all metal/biosorbent interactions. The data for qmax showed that for all metals PS + A. blazei was better to retain ions when...

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