The Degradation of Organics by Electro-Fenton System Using Graphite and Graphene Electrode as Cathode

Graphene was prepared by reduction of graphite oxide (GO), which was obtained from oxidation of graphite powder by Hummers′ method. The graphite and graphene were detected preliminary by X-ray diffraction(XRD)、transmission electron microscopy(TEM) and scanning electron microscopy(SEM). The graphene electrode was prapared by graphene and Polytetrafluoroethylene (PTFE). The electro-catalytic characteristics of electro-Fenton system which graphene or graphite worked as cathode and platinum net as anode at pH = 3.0 were studied by degrading organic dye rhodamine B (RhB) and toxic organic colorless micromolecule 2,4-dichlorophenol (2,4-DCP). The results showed that graphene cathode/Pt net electro-Fenton system had higher catalytic activity than graphite cathode/Pt net in the degradation and mineralization of RhB and 2,4-DCP. The deep degradation process of RhB was studied by UV-visible spectrum (UV-vis), IR and total organic carbon (TOC). Meanwhile, horseradish peroxidase (POD) and benzoic acid fluorescence analysis method were used to detect the concentration of hydrogen peroxide (H2O2) and hydrogen radicals (·OH). The experiment results indicated that electro-catalysis degradation of organic materials referred to ·OH radical mechanism.