Pre-oxidative catalytic treatment of toluidine blue with potassium permanganate in acidic solution |
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Authors: | Rafia Azmat Faryal Vali Mohammed Tehseen Ahmed Qurat-ul-Ain Tanwir |
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Institution: | 1. Department of Chemistry, University of Karachi, Karachi, 75270, Pakistan 2. International Chemical and Biological Sciences Center, H.E.J Reaseach Institute of Chemistry, University of Karachi, Karachi, 75270, Pakistan 3. Department of Chemistry, Jinnah University for Women, Karachi, 74600, Pakistan
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Abstract: | This article describes the potential of KMnO4 for oxidation of the thiazine dye (Toluidine blue TB) in an acidic medium. The effect of different operational parameters
like initial concentration of dye, potassium permanganate, pH, ionic strength, catalyst, acids and temperature were investigated
spectrophotometrically at λ
max = 613 nm. The results showed a complete removal of the TB with mineralization of the dye solution. Smooth and complete decoloration
was observed in the presence of monobasic acid (HCl) as compared to the H2SO4 where little color removal was observed. Pb was found to be an effective catalyst in oxidation for complete and fast decolorization
with mineralization. No significant change at elevated temperatures showed that an intermediate complex degraded with slight
change in the temperature. UV/visible spectrophotometry and GC mass analysis showed an intermediate activated complex demethylated
sulophooxide of TB which later on degraded into smaller fragments. |
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Keywords: | |
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