Abstract
The photocatalytic autoxidation of S 4O 6 2− and S 2O 3 2− by water-soluble porphyrin complexes Fe(2-TMPyP), Mn(4-TMPyP), and Co(2-TMPyP) were compared under illumination with a 419 nm visible light in oxygen-saturated aqueous solutions at room temperature. The process involves S 2O 3 2− as an intermediate product and SO 4 2− is the final oxidation product. The trend in photocatalytic activity of the porphyrin complexes for S 4O 6 2− oxidation is Co(2-TMPyP)>Mn(4-TMPyP)>Fe(2-TMPyP). For S 2O 3 2− oxidation, the trend is Co(2-TMPyP)>Fe(2-TMPyP)>Mn(4-TMPyP).
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