Carbonaceous cathode materials for electro-Fenton technology: Mechanism, kinetics, recent advances, opportunities and challenges.
Carbonaceous cathode materials for electro-Fenton technology: Mechanism, kinetics, recent advances, opportunities and challenges.
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DOI：
10.1016/j.chemosphere.2020.129325
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发表时间：
2020-12
期刊：
影响因子：
8.8
通讯作者：
K. M. Nair;V. Kumaravel;S. Pillai
中科院分区：
文献类型：
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作者：
K. M. Nair;V. Kumaravel;S. Pillai
近年来，电芬顿（EF）技术因其在降解有机污染物和新兴污染物（CEC）方面的高效性和环境兼容性而受到广泛关注。 EF反应的效率主要取决于通过2e─氧还原反应(ORR)形成过氧化氢(H2O2)以及羟基自由基(●OH)的产生。这可以通过在较宽的 pH 范围（pH 3-9）下工作的高效阴极材料来实现。本文对目前用于EF反应的碳质正极材料的研究进展进行了全面综述。对活性碳纤维（ACF）、碳/石墨毡（CF/GF）、碳纳米管（CNT）、石墨烯、碳气凝胶（CA）、有序介孔碳（OMC）等各种材料的见解。进行了包容性的讨论。使用过渡金属和杂原子作为掺杂剂来提高均相和非均相 EF 反应的效率。铁功能化阴极拓宽了工作 pH 范围（pH 1-9）并限制了能耗。解释了机理、反应器配置和动力学模型。 EF 反应的技术经济分析表明，阳极和原材料对总体成本的贡献很大。结论是，大多数反应遵循伪一级动力学，旋转阴极在实验室规模下提供最佳的 H2O2 生产效率。还讨论了 EF 反应用于废水处理的挑战、未来前景和商业化。
Electro-Fenton (EF) technique has gained significant attention in recent years owing to its high efficiency and environmental compatibility for the degradation of organic pollutants and contaminants of emerging concern (CECs). The efficiency of an EF reaction relies primarily on the formation of hydrogen peroxide (H2O2)via2e─oxygen reduction reaction (ORR) and the generation of hydroxyl radicals (●OH). This could be achieved through an efficient cathode material which operates over a wide pH range (pH 3–9). Herein, the current progresses on the advancements of carbonaceous cathode materials for EF reactions are comprehensively reviewed. The insights of various materials such as, activated carbon fibres (ACFs), carbon/graphite felt (CF/GF), carbon nanotubes (CNTs), graphene, carbon aerogels (CAs), ordered mesoporous carbon (OMCs),etc. are discussed inclusively. Transition metals and hetero atoms were used as dopants to enhance the efficiency of homogeneous and heterogeneous EF reactions. Iron-functionalized cathodes widened the working pH window (pH 1–9) and limited the energy consumption. The mechanism, reactor configuration, and kinetic models, are explained. Techno economic analysis of the EF reaction revealed that the anode and the raw materials contributed significantly to the overall cost. It is concluded that most reactions follow pseudo-first order kinetics and rotating cathodes provide the best H2O2production efficiency in lab scale. The challenges, future prospects and commercialization of EF reaction for wastewater treatment are also discussed.