An iron oxide/iron electrode was prepared from thermal oxidation of an iron plate under air-atmosphere in an electric furnace. The electrode, heat-treated at 600°C with mainly Fe
3O
4 structure, showed a photoelectrochemical response to visible light. The removal of Pb
2+ in HNO
3 solution was performed by the cell of this photoanode and graphite cathode in the presence of Ce
4+.
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