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Photocatalytic Degradation of Rhodamine B using Aqueous
Free-Base Porphyrin and Metalloporphyrins of Mn, Fe and Sn

The aqueous-porphyrins used in clinical studies for photodynamic therapy (PDT) are exploited as the
photocatalysts for the first time in the photodegradation of rhodamine B in the acetone medium. The
porphyrins such as free-base porphyrin TPPS4 and MnTPPS4Cl, FeTPPS4Cl, a dimer (FeTPPS4)2-O
and SnTPPS4Cl2 were synthesized and characterized by ultraviolet-visible, infrared, 1H NMR ,
fluorescence spectroscopies and elemental analysis. The band-gap energies of the respective porphyrins
were determined using DRS spectroscopy. They have shown 100% degradation of the dye within
25-40 min, which was confirmed by HPLC and ion-chromatography. This has revealed that
semiconductor aqueous-porphyrins may be a good choice as photocatalysts in the photodegradation
of rhodamine B dye.