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Physico-chemical properties of pristine graphene and its performance as electrode material for electro-Fenton treatment of wastewater

Abstract : This paper reports for the first time the performance of pristine graphene − in the form of graphene monolayer (Gmono), graphene multilayer (Gmulti) and graphene foam (Gfoam) − as cathode material in an electrochemical advanced oxidation process known as electro-Fenton (EF) for wastewater treatment. This study led to three major findings: (i) the electrogeneration of H2O2 was proven feasible with the three graphene materials at an optimal cathodic potential (Ecat) (-0.6 V vs Ag/AgCl) comparable to that obtained with other carbon-based cathodes such as graphite and carbon felt (Cfelt); (ii) for all forms of graphene, the Fe2+ regeneration rate and the H2O2 production yield were sufficient to sustain the formation of [radical dot]OH through the Fenton reaction, leading to the degradation and mineralization of phenol, used as a model pollutant and; (iii) over the 3 graphene materials, Gfoam exhibited the highest H2O2 electrogeneration yield (4.25 mg-H2O2 L−1 cm−3), degradation rate (0.0081 min−1) and yield (78% after 3 h), mineralization rate (0.0818 h−1) and yield (50% after 8 h). The superiority of Gfoam was attributed to its high purity (I(2D)/I(G) = 1.58, C1s/O1S = 22), low interfacial charge-transfer resistance (Rct) (1.6 Ω), high electroactive surface area (55.017 cm2) and three-dimensional (3D) porous structure (100–600 μm pore diameter), allowing it to outcompete conventional 3D carbon-based cathode materials in terms of efficiency and energy requirements. These results open up the possibility to use pristine graphene in EF for the treatment of wastewater.
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https://hal.univ-lorraine.fr/hal-01413696
Contributor : Emmanuel Mousset <>
Submitted on : Saturday, December 10, 2016 - 6:48:00 PM
Last modification on : Thursday, February 7, 2019 - 5:50:33 PM

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Emmanuel Mousset, Zuxin Wang, Joshua Hammaker, Olivier Lefebvre. Physico-chemical properties of pristine graphene and its performance as electrode material for electro-Fenton treatment of wastewater. Electrochimica Acta, Elsevier, 2016, 214, pp.217-230. ⟨10.1016/j.electacta.2016.08.002⟩. ⟨hal-01413696⟩

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