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

S.D. Gokakakar1,* and A.V. Salker2

1Department of Chemistry, P.E.S’s R.S.N. College of Arts and Science, Farmagudi, Ponda-403401, India

2School of Chemical Sciences, Goa University, Goa-403206, India

*Corresponding author: E-mail:


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.


Metalloporphyrins, Trivalent, Tetravalent metal ions, Photodegradation, Ion chromatography, Rhodamine B dye.

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