Biochar cathode: Reinforcing electro-Fenton pathway against four-electron reduction by controlled carbonization and surface chemistry
文献类型：期刊论文
| 作者 | Sun, Chen; Chen, Tong; Huang, Qunxing; Duan, Xiaoguang; Zhan, Mingxiu; Ji, Longjie; Li, Xiaodong; Wang, Shaobin; Yan, Jianhua |
| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2021-02-01 |
| 卷号 | 754页码:- |
| 关键词 | Porous biochar Electro-Fenton oxidation H2O2 Hydroxyl radical, advanced oxidation processes |
| ISSN号 | 0048-9697 |
| 英文摘要 | Porous biochars have attracted tremendous interests in electrochemical applications. In this study, a family of biochars were prepared from cellulose subject to different carbonization temperatures ranging from 400 to 700 degrees C, and the biochars were in-situ activated by a molten salt (ZnCl2) to construct a hierarchically porous architecture. The activated porous biochars (ZnBC) were used as a carbocatalyst for electro-Fenton (EF) oxidation of organic contaminants. Results showed that high-temperature carbonization improved the activity of biochar for four-electron oxygen reduction reaction (ORR) due to the rich carbon defects, while the mild-temperature treatment regulated the species and distribution of oxygen functional groups to increase the production of hydrogen peroxide (H2O2) via a selective two-electron ORR pathway. ZnBC-550 was the best cathode material with a high ORR activity without compromise in H2O2 selectivity; a high production rate of H2O2 (796.1 mg/g/h) was attained at -0.25 V vs RHE at pH of 1. Furthermore, Fe(II) addition induced an electro-Fenton system to attain fast decomposition of various organic pollutants at -0.25 V vs RHE (reversible hydrogen electrode) and pH of 3 with a satisfactory mineralization efficiency toward phenolic pollutants. The EF system maintains its excellent stability for 10 cycles. Hydroxyl radicals were identified as the dominant reactive oxygen species based on in situ electron paramagnetic resonance (EPR) analysis and radical quenching tests. This study gains new insights into electrocatalytic H2O2 production over porous biochars and provides a low-cost, robust and high-performance electro-Fenton cathode for wastewater purification. (C) 2020 Published by Elsevier B.V. |
| WOS研究方向 | Environmental Sciences |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/45428]  |
| 专题 | 生态环境研究中心_城市与区域生态国家重点实验室 |
| 作者单位 | 1.Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Peoples R China 2.Univ Adelaide, Sch Chem Engn & Adv Mat, Adelaide, SA 5005, Australia 3.China Jiliang Univ, Coll Metrol & Measurement Engn, Hangzhou 310018, Peoples R China 4.Beijing Construct Engn Grp Environm Remediat Co L, Natl Engn Lab Site Remediat Technol, Beijing 100015, Peoples R Chin 5.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sun, Chen,Chen, Tong,Huang, Qunxing,et al. Biochar cathode: Reinforcing electro-Fenton pathway against four-electron reduction by controlled carbonization and surface chemistry[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,754:-. |
| APA | Sun, Chen.,Chen, Tong.,Huang, Qunxing.,Duan, Xiaoguang.,Zhan, Mingxiu.,...&Yan, Jianhua.(2021).Biochar cathode: Reinforcing electro-Fenton pathway against four-electron reduction by controlled carbonization and surface chemistry.SCIENCE OF THE TOTAL ENVIRONMENT,754,-. |
| MLA | Sun, Chen,et al."Biochar cathode: Reinforcing electro-Fenton pathway against four-electron reduction by controlled carbonization and surface chemistry".SCIENCE OF THE TOTAL ENVIRONMENT 754(2021):-. |
入库方式： OAI收割
来源：生态环境研究中心
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