Nitrogen-Doped Graphitized Carbon Electrodes for Biorefractory Pollutant Removal
Résumé
A novel material was fabricated by deposition of graphitized Nitrogen-doped Porous
Carbon layer (NPC) on commercial Carbon Felt (CF). The NPC was obtained via Atomic Layer
Deposition of zinc oxide (ZnO) and its subsequent solvothermal conversion to Zeolitic
Imidazolate Framework (ZIF-8) followed by its carbonization under controlled atmosphere. Both
physical and electrochemical properties have been evaluated by Scanning Electron Microscopy,
X-Ray Diffraction, Energy-Dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy,
Raman spectroscopy, nitrogen sorption, contact angle and cyclic voltammetry measurements.
The parameters affecting the growth of NPC, such as the amount of ZnO/ZIF-8 material before
calcination and thermal treatment temperature have been investigated in details. The versatility
of the as-prepared NPC/CF material was assessed by studying: i) its adsorption ability and/or ii)
its behavior as cathode in Electro-Fenton process (EF) for the elimination of a model refractory
pollutant (acid orange 7 (AO7)). Once used as adsorbent, the NPC/CF proved good adsorption 2
capacity with 97 % color removal of initial 0.02 mM dye concentration after 30min. Moreover,
the application of such novel cathode could also reduce the cost for EF technology by using
lower energy consumption at 0.54 kWh g−1 TOC. The apparent rate constant (kapp~0.8 min-1
)
obtained for NPC/CF was more than 7 times higher compared to pristine CF commercial
electrode, thus leading to more than 90% TOC removal in 8 h. In addition, high reaction
efficiency and system durability were attributed to continuous regeneration of the NPC/CF
sorption capacity upon total mineralization of the pollutants accumulated at the electrode surface.
Results confirmed that the new NPC/CF material behaves as a highly active electrode with
attractive adsorption efficiency and at the same time it possess an excellent electrochemical
activity in Electro-Fenton (EF) oxidation process for the removal of persistent water pollutants.
Domaines
Chimie
Fichier principal
Journal of Physical Chemistry C, 2017, 121, 15188–15197.pdf (1.28 Mo)
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