

Kinetics of oxidative degradation of Rhodamine-B by N-bromosuccinimide in aqueous alkaline medium
Alaa Eldin Mokhtar Abdel-Hady (1,*)

(1) Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Sinai University, Arish City, 45518, Cairo, Egypt
(*) Corresponding Author
Received: 11 Apr 2013 | Revised: 21 Jun 2013 | Accepted: 15 Jun 2013 | Published: 30 Sep 2013 | Issue Date: September 2013
Abstract
The 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/dm3 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.

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DOI: 10.5155/eurjchem.4.3.292-296.795
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Citations
[1]. Faouzia Khili, Amel Dakhlaoui Omrani
Synthesis of nanocellulose/cobalt oxide composite for efficient degradation of Rhodamine B by activation of peroxymonosulfate
European Journal of Chemistry 10(1), 19, 2019
DOI: 10.5155/eurjchem.10.1.19-25.1789

[2]. Alaa Eldin Mokhtar Abdel-Hady
Kinetics and mechanism of the electron transfer in [N,N′-bis(salicylidene)-1,2-ethanediamine]chromium(III) complex by N-bromosuccinimide: evidence for the catalytic effect of iron(II) ions
Monatshefte für Chemie - Chemical Monthly 146(1), 7, 2015
DOI: 10.1007/s00706-014-1307-5

[3]. Alaa Eldin Mokhtar Abdel-Hady, Ashraf M. Taha
Kinetics and mechanism of the oxidative degradation of sofosbuvir by N-bromosuccinimide in aqueous medium
SN Applied Sciences 1(9), , 2019
DOI: 10.1007/s42452-019-1021-3

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