Eur. J. Chem. volume 4, issue 3, P292-296 2013 DOI: 10.5155/eurjchem.4.3.292-296.795

Kinetics of oxidative degradation of Rhodamine-B by N-bromosuccinimide in aqueous alkaline medium

Alaa Eldin Mokhtar Abdel-Hady
Abstract: KEYWORDSThe kinetics of oxidative degradation of Rhodamine-B (RhB) by N-bromosuccinimide (NBS) in aqueous alkaline and H2O-MeOH solvent mixtures were studied spectrophotometrically over the 20-40 °C range, 0.1-0.4 mol/dm 3 ionic strength, 11.3-12.1 pH range and 0-30 wt% MeOH-H2O solvent mixtures for a range of NBS and Rhodamine-B concentrations. The rate of reaction showed first order dependence on both [NBS], [RhB] and inverse first order dependent upon [OH -]. The rate decreased with decreasing the dielectric constant of the medium and was independent on the ionic strength over the range studied. An inner-sphere mechanism in which the protonated Rodamine-B, (RhBH+) was considered as the main reactive species is proposed. Kinetics Oxidation Rhodamine-B N-Bromosuccinimide Oxidative degradation Inner-sphere mechanism
x

Classification

0
1
0

Paper Sections

0
0
0
0
0