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- W2056599381 abstract "Abstract This investigation was designed to characterize three lead ferrites obtained from the ‘ferrite process’ for lead removal from wastewater. The three different compounds, obtained according to the starting Fe 2+ /Pb 2+ molar ratio (Pb 0.04 Fe II 0.96 Fe III 2 O 4 · n H 2 O; Pb 0.07 Fe II 0.93 Fe III 2 O 4 · n H 2 O and Pb 0.17 Fe II 0.83 Fe III 2 O 4 · n H 2 O for ratios of 15/1, 7/1 or 3/1, respectively) were subjected to XRF and chemical analysis (ICP-AES and potentiometric titrations), and to XRD, DSC and FTIR which indicated Pb x Fe 3− x O 4 ·Fe 3 O 4 ·PbO· n H 2 O as the most probable structure. Electrochemical analysis of the solid lead ferrites was performed using a carbon paste electrode in HClO 4 and HCl medium. In each case, the first cyclic-voltammogram showed the participation of solid species in the electrochemical transformation process since the shape of the spectra could be related to the structure and stoichiometry of the ferrites. In second and successive scans, the voltammograms indicated the redox couples Fe 3+ ads +1e − ⇔Fe 2+ ads and Pb 2+ ads +2e − ⇔Pb° (s) in HClO 4 and FeCl 2 ads + +1e − ⇔FeCl + ads and PbCl 2 (s)+2e − ⇔Pb (s)+2Cl − in HCl. These mechanisms were confirmed by the half-peak potentials and the displacement of the peaks associated with HCl activity." @default.
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- W2056599381 date "1999-12-01" @default.
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- W2056599381 title "Chemical and electrochemical characterization of lead ferrites produced in the purification of lead-bearing wastewater" @default.
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- W2056599381 doi "https://doi.org/10.1016/s0013-4686(99)00308-4" @default.
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