Divyapriya Govindaraj, Nidheesh Puthiya Veetil
Indian Institute of Technology Madras, Chennai, Tamil Nadu 600036, India.
Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, United States.
ACS Omega. 2020 Mar 6;5(10):4725-4732. doi: 10.1021/acsomega.9b04201. eCollection 2020 Mar 17.
Graphene-based nanomaterials have attracted researchers from various fields due to their extraordinary physical, chemical, and electrochemical properties. An emerging class of graphene-based nanostructures and nanocomposites is considered to be a promising solution to various types of environmental pollution. The electro-Fenton process is one of the easy and effective approaches to treating a wide range of organic pollutants in a liquid medium. The usage of graphene-based electrodes in the electro-Fenton process is considered to be a promising and cleaner way to produce reactive oxygen species to mineralize organic contaminants rapidly. Graphene derivatives are used to immobilize various heterogeneous Fenton catalysts for improved catalytic activity, stability, and reusability. In this review, the importance of graphene-based materials in improving the performance efficiency in the electro-Fenton process is presented along with an enhancement mechanism through the following discussions: (i) the significance of oxygen functional groups and nitrogen doping on graphene layers to enhance the two-electron oxygen reduction reactions; (ii) the advantages of iron-loaded graphene-based materials as catalysts and composite electrodes for the enhanced production of reactive oxygen species; (iii) a summary of various forms of graphene-based materials, modifications in their chemical structure, properties, and applications in the electro-Fenton process to remove organic contaminants.
基于石墨烯的纳米材料因其非凡的物理、化学和电化学性质吸引了各个领域的研究人员。一类新兴的基于石墨烯的纳米结构和纳米复合材料被认为是解决各类环境污染问题的一个有前景的方案。电芬顿工艺是在液体介质中处理多种有机污染物的简便且有效的方法之一。在电芬顿工艺中使用基于石墨烯的电极被认为是一种有前景且更清洁的方式，用于产生活性氧以快速矿化有机污染物。石墨烯衍生物用于固定各种非均相芬顿催化剂，以提高催化活性、稳定性和可重复使用性。在本综述中，通过以下讨论阐述了基于石墨烯的材料在提高电芬顿工艺性能效率方面的重要性以及增强机制：(i) 石墨烯层上的氧官能团和氮掺杂对增强双电子氧还原反应的重要性；(ii) 负载铁的基于石墨烯的材料作为催化剂和复合电极在增强产生活性氧方面的优势；(iii) 基于石墨烯的材料的各种形式、其化学结构的改性、性质以及在电芬顿工艺中去除有机污染物的应用总结。
