Yu Tian, Breslin Carmel B
Department of Chemistry, Maynooth University, Maynooth, Co. Kildare, Ireland.
Materials (Basel). 2020 May 14;13(10):2254. doi: 10.3390/ma13102254.
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 HO 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.
近年来，基于石墨烯的材料已被认定为电芬顿领域一种新兴且前景广阔的新材料，它有潜力形成高效的无金属催化剂，可用于去除水中的污染物，从而节约宝贵的水资源。在这篇综述中，将描述和讨论基于石墨烯的材料在电芬顿中的最新应用。首先，简要介绍均相和异相电芬顿方法，强调通过溶解氧的双电子还原生成羟基自由基（HO）及其催化分解以产生活性氧化羟基自由基的重要性。接下来，考虑基于石墨烯的电极在促进这种双电子氧还原反应方面的应用前景，随后介绍各种已成功用于制备电芬顿中高效基于石墨烯的阴极的基于石墨烯的材料。特别是，与其他含碳材料复合、氮掺杂、形成高孔隙率气凝胶、三维材料和多孔气体扩散电极、用作氧化铁载体并经二茂铁功能化且用于更有效的异相电芬顿的基于石墨烯的复合材料，都在综述范围内。很明显，基于石墨烯的材料有潜力降解和矿化染料、药物化合物、抗生素、酚类化合物，并且在电芬顿和其他高级氧化过程中显示出巨大潜力。
