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Oxidative decolorisation of E riochrome B lack T with C hloramine‐ T : kinetic, mechanistic, and spectrophotometric approaches
Author(s) -
Manjunatha Adalagere S,
Sukhdev Anu
Publication year - 2014
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/cote.12104
Subject(s) - chemistry , eriochrome black t , oxidative phosphorylation , kinetics , nuclear chemistry , medicinal chemistry , biochemistry , organic chemistry , adsorption , physics , quantum mechanics
The kinetics and mechanism of oxidative decolorisation of Eriochrome Black T ( EBT ) with sodium N ‐chloro‐ p ‐toluenesulfonamide or Chloramine‐T ( CAT ), catalysed by osmium tetroxide [Os( VIII )] in alkaline medium and uncatalysed in acid medium, have been spectrophotometrically investigated at 303 K. The reaction exhibited a first‐order dependence of rate on [ CAT ] 0 and [ EBT ] 0 in both media, and also with respect to [H + ]. The order with respect to [ OH ‐ ] and [Os( VIII )] was fractional. Activation parameters were deduced. It was observed that the uncatalysed decolorisation reaction was ca . eightfold faster in acid medium in comparison with alkaline medium, while the Os( VIII )‐catalysed reaction was ca . sevenfold faster than the uncatalysed reaction. Mechanisms and rate laws were determined. The chemical oxygen demand of Eriochrome Black T dye was also determined. Importantly, the developed oxidative decolorisation method is simple, efficient, inexpensive, requires less time, and is environmentally benign. Hence, it can be adapted for treating Eriochrome Black T present in industrial and laboratory wastewater.