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Elaboration and characterization of new conductive porous graphite membranes for electrochemical advanced oxidation processes
- Ayadi, Saloua, Jedidi, Ilyes, Rivallin, Matthieu, Gillot, Frédéric, Lacour, Stella, Cerneaux, Sophie, Cretin, Marc, Ben Amar, Raja
- Journal of membrane science 2013 v.446 pp. 42-49
- Raman spectroscopy, additives, artificial membranes, carbonization, decolorization, electrochemistry, graphene, nitrogen, oxidation, particle size, pollutants, porosity, powders, temperature, ultrafiltration
- Three different graphite powders with different particles sizes were tested to synthesize tubular monochannel carbon supports for micro and ultrafiltration membranes using a new process. Carbon graphite powders and organic additives were mixed with an ethanolic solution of Resol® type phenolic resin. The extruded tubes were firstly consolidated by curing the resin at 150°C then carbonized under nitrogen stream (1mLmin⁻¹) for graphitization and pores opening. Supports with optimal properties were obtained using a mixture of Resol® resin and a 44µm particle size graphite powder, carbonized at 1000°C. They showed a porosity value of 37%, an average pore size diameter of 3µm, high mechanical and chemical resistances and an average conductivity of 190Ω⁻¹cm⁻¹. The Raman spectroscopy results show that graphitization degree of the material is closely related to the carbonization temperature, which explains the increase of conductivity with temperature. Acid Orange 7 (AO7), a common dye, was finally used as a model molecule to demonstrate the ability of the graphitic membranes to mineralize organic pollutants by electro-Fenton process. Spectrophotometric measurements were conducted on the treated solutions as a function of chemical and electrochemical conditions to determine the degradation kinetic of AO7. Decolorization rate was also measured as a function of time.