Abstract
The iron oxide electrode was prepared from thermal oxidation of iron at 600 °C for 3 h in air atmosphere. This electrode with the structure of Fe 3O 4 and α-Fe 2O 3 showed the response of photoanodic current to the light with wavelength shorter than 600 nm. The band gap energy of this electrode was 1.99 eV. The onset potential of distinct steady photocurrent and also the flatband potential were 0.80 and 0.09 V vs. Ag/AgCl, respectively, in 0.1 M HNO 3 aqueous solution. The cell consisting of the iron oxide photoanode in HNO 3–Pb(NO 3) 2 and the graphite cathode in H 2SO 4–Ce(SO 4) 2 caused the PbO 2 deposit on the surface of the former electrode due to visible light irradiation without application of voltage. By holding the potential of this electrode at more positive value than 0.90 V, the photoanodic removal rate of Pb 2+ in HNO 3–Pb(NO 3) 2 solution was higher than that observed when Ce 4+ was used as electron acceptor.
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