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Ionothermal Carbonization of Biomass to Construct Fe, N-Doped Biochar with Prominent Activity and Recyclability as Cathodic Catalysts in Heterogeneous Electro-Fenton
ACS ES&T Engineering Pub Date : 2020-10-01 , DOI: 10.1021/acsestengg.0c00001
Hong-Chao Li 1 , Xiang-Yu Ji 1 , Xiao-Qiang Pan 1 , Chang Liu 1 , Wu-Jun Liu 1
Affiliation  

Heterogeneous electro-Fenton is an efficient advanced oxidation process for the degradation of refractory organic contaminants in wastewater, and its efficiency is governed by cathodic catalysts. In this work, the Fe, N doped biochar materials (Fe/N/biochar) were synthesized via a simple ionothermal carbonization of biomass and used as a cathodic catalyst for heterogeneous electro-Fenton. The as-synthesized biochar materials with uniform doping of N and Fe significantly improved the performance of the electro-Fenton process via promoting the two-electron transfer oxygen reduction reaction for H2O2 production and subsequent H2O2 activation for reactive oxygen species (e.g., OH and O2) generation. The Fe, N doped biochar catalyst showed excellent recyclability in the cycle runs of the electro-Fenton process, in which its catalytic activity did not fade but continuously increased. Based on the ex situ high resolution transmission electron microscopy and electron paramagnetic resonance results, more active catalytic site exposure was induced by the interfacial crystalline-phase transformation and contributed to the excellent recyclability of the catalyst. This work will provide new insights into the rational design and synthesis of efficient electro-Fenton catalysts with a prominent activity and recyclability.

中文翻译:

生物质的离子热碳化,以构建具有突出活性和可回收性的Fe,N掺杂生物炭,作为非均相电子Fenton中的阴极催化剂

非均质电芬顿是一种高效的高级氧化工艺,用于降解废水中的难降解有机污染物,其效率由阴极催化剂控制。在这项工作中,Fe,N掺杂的生物炭材料(Fe / N / biochar)是通过生物质的简单离子热碳化合成的,并用作异质电Fenton的阴极催化剂。合成的具有均匀掺杂N和Fe的生物炭材料,通过促进产生H 2 O 2的双电子转移氧还原反应和随后的H 2 O 2活化活性氧,显着提高了Fenton工艺的性能。(例如 OH和O 2 )生成。掺铁,氮的生物炭催化剂在电子芬顿工艺的循环过程中显示出极好的可循环性,其中其催化活性没有下降,而是持续增加。基于异位高分辨率透射电子显微镜和电子顺磁共振结果,界面晶相转变引起更多的活性催化部位暴露,并有助于催化剂的优异可回收性。这项工作将为有效设计具有明显活性和可回收性的高效电子芬顿催化剂的合理设计和合成提供新见解。
更新日期:2020-10-01
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