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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/14316

Title: Electrochemical oxidation of ionic liquids at highly boron doped diamond electrodes
Authors: Fabianska, Aleksandra
Ossowski, Tadeusz
Bogdanowicz, Robert
Czupryniak, Justyna
Gnyba, Marcin
Odzga, Tomasz
Janssens, Stoffel D.
Haenen, Ken
Siedlecka, Ewa M.
Issue Date: 2012
Abstract: An electrochemical oxidation using a highly boron-doped diamond (BDD) electrode has been tested for the treatment of solutions containing ionic liquids (ILs). The double-sided Si/highly BDD electrodes were synthesized by microwave plasma enhanced chemical vapour deposition (MW PE CVD). Investigation of the electrode surface with scanning electron microscopy (SEM) confirmed that the synthesized layers were continuous and formed densely packed grain structure. The structure of BDD was confirmed by Raman spectra analysis. The effect of IL structure as the kind of electrolyte (Na2SO4 and NaCl) has been investigated. Electrolyses were conducted in an undivided electrolytic cell under galvanostatic conditions. The efficiency of the process has been evaluated in terms of variations of IL concentrations and chemical oxygen demand (COD) removal. Results show that pyridinium ILs were easier removed than imidazolium salts. The intermediates of electrochemical degradation of 1-butyl-3-methylimidazolium salt were detected, and IL degradation pathway was proposed based on the analytical results. It was suggested that center dot OH radicals produced by water electrolysis attacked IL to form its derivatives with keto groups substituted to imidazolium ring. These compounds underwent ring breakage, which led to the formation of aliphatic acids that were eventually mineralized by electrolysis to CO2. Other by-products were obtained by cutting one of the side chains substituted to N atoms in imidazolium ring. Additionally in NaCl electrolyte chloroorganic by-products were identified.
Notes: [Bogdanowicz, Robert; Gnyba, Marcin] Gdansk Univ Technol, Dept Metrol & Optoelect, PL-80233 Gdansk, Poland. [Fabianska, Aleksandra; Ossowski, Tadeusz; Czupryniak, Justyna; Gnyba, Marcin; Siedlecka, Ewa M.] Univ Gdansk, Fac Chem, PL-80952 Gdansk, Poland. [Odzga, Tomasz] Gdansk Univ Technol, Dept Electrochem Corros & Mat Engn, PL-80233 Gdansk, Poland. [Janssens, Stoffel D.; Haenen, Ken] Hasselt Univ, Inst Mat Res IMO, B-3590 Diepenbeek, Belgium. [Janssens, Stoffel D.; Haenen, Ken] IMEC VZW, IMOMEC, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/14316
DOI: 10.1002/pssa.201200056
ISI #: 000308942100029
ISSN: 1862-6300
Category: A1
Type: Journal Contribution
Validation: ecoom, 2013
Appears in Collections: Materials Physics
Institute for Materials Research

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