Photoreduction of Cr(VI) in Fe(III)-lactate System

摘要

The photochemical reduction of Cr(VI) in aqueous solutions containing Fe(III)-lactate complex was preliminarily investigated. The effects of initial pH, initial concentrations of Fe (III), lactate and Cr(VI) were studied in detail and the photoreduction mechanism of Cr(VI) was discussed preliminarily. The results indicate that Cr(VI) can be effectively photochemically reduced by Fe(III)-lactate complex, and the optimum pH for photoreduction of Cr(VI) is 3.0. The reduction efficiency of Cr(VI) decreases with increase of the initial concentrations of Cr(VI) over the range of 12.0～48.0 μM. The initial rate of Cr (VI) photoreduction increases with increase of the initial concentrations of Fe (III) or lactate. The photoreduction reaction is accordance with the law of apparent first-order dynamics reaction.