Issue 11, 2013

Substrate versus oxidant activation in RuIII(edta) catalyzed dye degradation

Abstract

The [RuIII(edta)(H2O)] (edta4− = ethylenediaminetetraacetate) catalyzed oxidative degradation of methylene blue (MB) in the presence of H2O2 has been achieved. Complete degradation of 0.05 mM MB was noticed within 300 s in the presence of 5.0 μM of Ru(edta) catalyst under ambient conditions. Catalytic degradation of the dye was investigated by using rapid-scan spectrophotometry as a function of [Ru(edta)], [H2O2], [MB] and pH at 25 °C. Spectral analyses and kinetic data point towards a catalytic pathway that involves the rapid coordination of MB to the RuIII(edta) complex to yield [RuIII(edta)(MB)] species that react directly with hydrogen peroxide. The catalytic-active intermediate [RuIII(edta)(OOH)]2− was also found to be operative at high H2O2 concentration over the Ru(edta) catalyst in effecting MB degradation under the specified conditions.

Graphical abstract: Substrate versus oxidant activation in RuIII(edta) catalyzed dye degradation

Supplementary files

Article information

Article type
Paper
Submitted
07 Nov 2012
Accepted
03 Jan 2013
First published
04 Feb 2013

RSC Adv., 2013,3, 3606-3610

Substrate versus oxidant activation in RuIII(edta) catalyzed dye degradation

D. Chatterjee, S. Rothbart and R. van Eldik, RSC Adv., 2013, 3, 3606 DOI: 10.1039/C2RA22810F

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