Abstract
The aqueous oxidation of Green S dye by hydrogen peroxide includes two alternative pathways: nucleophilic attack on the central carbon at near-neutral and high pH and the formation of N-oxide in the region of lower pH. This is indicative of a pH switch between nucleophilic and electrophilic reaction mechanisms for H2O2 oxidation. The strong catalytic effect of chloride anion together with methyltrioxorhenium (MTO) on Green S oxidation by hydrogen peroxide has been observed, conforming to the staggered mechanism which involves the formation of free chlorine at a very low steady-state concentration. In terms of the observed first-order rate constants, the catalytic effect is estimated to be at least 2000 compared to the uncatalysed reaction, for an MTO concentration of 3.0 × 10−6 mol dm−3 and Cl− concentration of 0.10 mol dm−3 at pH 1.3.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
