Active catalysts of sonoelectrochemically prepared iron metal nanoparticles for the electroreduction of chloroacetates
Saez, V., Gonzalez-Garcia, J. and Marken, F., 2010. Active catalysts of sonoelectrochemically prepared iron metal nanoparticles for the electroreduction of chloroacetates. Physics Procedia, 3 (1), pp. 105-109.
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A new methodology for the sonoelectro-deposition and stripping of highly reactive iron at boron-doped diamond electrodes has been studied. In aqueous 1 M NH4F iron metal readily and reversibly electro-deposits onto boron-doped diamond electrodes. The effects of deposition potential, FeF6 3- concentration, deposition time, and mass transport are investigated and also the influence of power ultrasound (24 kHz, 8 Wcm -2). Scanning electron microscopy images of iron nanoparticles grown to typically 20-30 nm diameters are obtained. It is shown that a strongly and permanently adhering film of iron at boron-doped diamond can be formed and transferred into other solution environments. The catalytic reactivity of iron deposits at boron-doped diamond is investigated for the reductive dehalogenation of chloroacetate. The kinetically limited multi-electron reduction of trichloroacetate is dependent on the FeF63- deposition conditions and the solution composition. It is demonstrated that a stepwise iron-catalysed dechlorination via dichloroacetate and monochloroacetate to acetate is feasible. This sonoelectrochemical methodology offers a novel, clean and very versatile electro-dehalogenation methodology. The role of fluoride in the surface electrochemistry of iron deserves further attention.
|Creators||Saez, V., Gonzalez-Garcia, J. and Marken, F.|
|Departments||Faculty of Science > Chemistry|
|Additional Information||International Congress on Ultrasonics, ICU 2009. 11-17 January 2009. Santiago, Chile.|
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