Abstract
Ferric tannate (FT) has capacities on simultaneous adsorption of NH4+-N and NO2--N. So far, no study has been reported on the mechanism of FT in the removal of NH+-N and NO2--N. In this work, FT was prepared for nitrogen removal, and the potential of FT in treating NH+-N and NO2--N from aqueous solution was investigated. The influence parameters e.g. substrate concentration and FT dosage on removing nitrogen from aqueous solution were optimized. The results showed that more N2 generated when FT was added to the oxidation-reduction reaction between NH4+-N and NO2--N. The concentration of NO2--N was higher than that of NH4+-N would be conductive for the N2 generation when adding FT. The Fourier Transform Infrared (FTIR) Spectrometer results showed that the structure of the FT (Fe-O) changed in the redox between NH4+-N and NO2--N. The X-ray photoelectron spectroscopy (XPS) results showed that Fe3+ and Fe2+ coexisted in FT.
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