Electro Coagulation Removal of As from Water: the Role of Phases Formation
2015
Maldonado-Reyes, A. | Montero-Ocampo, C. | Medina-Garcia, J. | Bolado-Rodríguez, S. | Alvárez-Benedí, J. | Herrera-Vazquez, A. | Castaño, V. M.
The adsorbents (such as hydrous ferric oxides, HFO) generated in the electrocoagulation (EC) processing with iron electrodes are able to remove effectively inorganic arsenic (As) present in underground water. A characterization of the HFO phases produced during the arsenic removal by the EC process from low and high arsenic concentration, by using X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, energy dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM), is presented. The main HFO phase produced by this process is lepidocrocite (γ-FeOOH), and that the sorption of arsenic by this solid-state phase formed as part of the EC process was effective in removing arsenic from aqueous solution.
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