Year-end Sale % OFF 
Abstract
In recent years, graphene-based materials have been identified as an emerging and promising new material in electro-Fenton, with the potential to form highly efficient metal-free catalysts that can be employed in the removal of contaminants from water, conserving precious water resources. In this review, the recent applications of graphene-based materials in electro-Fenton are described and discussed. Initially, homogenous and heterogenous electro-Fenton methods are briefly introduced, highlighting the importance of the generation of H2O2 from the two-electron reduction of dissolved oxygen and its catalysed decomposition to produce reactive and oxidising hydroxy radicals. Next, the promising applications of graphene-based electrodes in promoting this two-electron oxygen reduction reaction are considered and this is followed by an account of the various graphene-based materials that have been used successfully to give highly efficient graphene-based cathodes in electro-Fenton. In particular, graphene-based composites that have been combined with other carbonaceous materials, doped with nitrogen, formed as highly porous aerogels, three-dimensional materials and porous gas diffusion electrodes, used as supports for iron oxides and functionalised with ferrocene and employed in the more effective heterogeneous electro-Fenton, are all reviewed. It is perfectly clear that graphene-based materials have the potential to degrade and mineralise dyes, pharmaceutical compounds, antibiotics, phenolic compounds and show tremendous potential in electro-Fenton and other advanced oxidation processes.
Highlights
As the quality of water continues to decrease, there has been an ever-increasing interest in advanced oxidation processes (AOPs) that are capable of mineralising organic pollutants to CO2, H2 O and inorganic ions, or at least to harmless products [1]
In most of these approaches, the graphene-modified electrode is compared to the conducting carbon or graphite felt or carbon cloth substrate electrodes and the addition of reduced GO (rGO) clearly enhances the rate of H2 O2 generation to give a more efficient removal of the contaminants
It was found that the highest H2O2 production and current efficiency were achieved with the CNTgas diffusion electrode modified with 2% TBAQ, giving 2.15 mg h−1 cm−2 compared to 1.97 mg cm−2 h−1 of H2O2 for the corresponding graphene-based material
Summary
As the quality of water continues to decrease, there has been an ever-increasing interest in advanced oxidation processes (AOPs) that are capable of mineralising organic pollutants to CO2 , H2 O and inorganic ions, or at least to harmless products [1]. The main principle of the E-Fenton process is summarised in Equation (1), where the oxidation of Fe2+ to Fe3+ facilitates the conversion of H2O2 to the highly oxidising OH, with a standard reduction potential of 2.56 V vs SCE (saturated calomel electrode). These OH radicals radicals can can be be potential employed to to mineralise mineralise a large number of organic contaminants. High and sustainable amounts of H2O2 are required to provide efficient levels of OH and this can be difficult as the two-electron oxygen reduction reaction. For Fenton (grey), E-Fenton (blue) and E-Fenton coupled with graphene-based materials (black)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
