| A simple, mild and low-cost hydrothermal method with alterationo of FeCl3·6H2O was used to prepared high efficient Fe-TiO2 with special microstructure by optimizing the material growth conditions. The photocatalytic activity of catalysts was tested with nitrogen fixation. The properties of the samples are characterized by means of XRD, TEM, XRF and UV-Vis.After 3h UV irradiation photocatalytic activity of Fe-TiO2 is higher 2.5 times than that of pure TiO2. The effects of Fe3+ concent, hole scavengers (such as ethanol, sodium acetate, sodium formate, sodium oxalate), concentration of ethanol on nitrogen fixation were systematically investigated. The experimental results showed that titanium treated at 500℃and doped 0.01% had the best photocatalytic activity, the production NH4-N increased by increasing concentration of ethanol.Investigate the electrochemical properties of Fe-TiO2 by cyclic voltammetric and AC impedance spectra. For Fe-TiO2 catalyst, the electrode reaction shows an irreversible response. The electronic transfer number of nitrogen is 2 with 0.01% Fe-TiO2 as work electrode.The electrochemical impedance spectra showed that the electron transformation resistance Rct of Fe-doped TiO2 was less 70%-80% than the Rct of pure TiO2,this presented that the electrical conductivity of Fe-TiO2 was much improved than TiO2. Mott-Schottky equation results obtained, Fe-TiO2 electrode flat-band negative shift and electron density is growing with the increased amount of doped iron, and the optimum content of Fe3+ is 0.01%, consistent with nitrogen fixation efficiency.0.01% Electron density with Fe-TiO2 as work electrode is 1.5 times than that of undoped TiO2 electrode.
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