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Porous carbon monoliths for electrochemical removal of aqueous herbicides by “one-stop” catalysis of oxygen reduction and H₂O₂ activation

Yu, Menglin and Dong, Heng and Liu, Kai and Zheng, Yingdie and Hoffmann, Michael R. and Liu, Weiping (2021) Porous carbon monoliths for electrochemical removal of aqueous herbicides by “one-stop” catalysis of oxygen reduction and H₂O₂ activation. Journal of Hazardous Materials, 414 . Art. No. 125592. ISSN 0304-3894. https://resolver.caltech.edu/CaltechAUTHORS:20210308-143227657

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Abstract

The overuse of herbicides has posed a threat to human health and the aquatic environment via DNA mutations and antibiotic gene resistance. Carbon-based cathodic electrochemical advanced oxidation has evolved as a promising technology for herbicide degradation by generating hydroxyl radicals (•OH). However, conventional electro-Fenton process relies on interaction of multiple species that adds to the system complexity and cost and narrows the working pH range. Herein, a series of porous carbon monoliths (PCMs) were developed as a “one-stop” platform for catalysis of the 2-electron ORR coupled with further catalytic reductive cleavage of H₂O₂ to produce •OH. A PCM prepared using 1,6-hexamethylene diamine (denoted as PCM-HDA) produced H₂O₂ at a level that was 374% higher than that obtained using commercially available carbon black at circum-neutral pH. Meanwhile, the generated H₂O₂ was catalytically decomposed to produce •OH. Based on these results, the PCM-HDA electrode achieved an 80 ± 2% degradation of napropamide in 60 min over the pH range of 4–10 at a mildly reducing potential, with a 69 ± 2% TOC reduction at circum-neutral condition in 2 h. This simplified system overcomes the system complexity and pH limitation of the conventional electron-Fenton processes.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.jhazmat.2021.125592DOIArticle
ORCID:
AuthorORCID
Dong, Heng0000-0002-4168-7297
Liu, Kai0000-0002-2109-8196
Hoffmann, Michael R.0000-0001-6495-1946
Liu, Weiping0000-0002-1173-892X
Alternate Title:Porous carbon monoliths for electrochemical removal of aqueous herbicides by “one-stop” catalysis of oxygen reduction and H2O2 activation
Additional Information:© 2021 Elsevier B.V. Received 8 December 2020, Revised 12 February 2021, Accepted 3 March 2021, Available online 5 March 2021. This work was supported by National Natural Science Foundation of China (Grant No. 21777137, 21621005) and the Bill and Melinda Gates Foundation (Grant No. INV003227). The authors would also like to thank China Scholarship Council for the support. CRediT authorship contribution statement: Menglin Yu: Conceptualization, Methodology, Investigation, Data curation, Formal analysis, Writing - review & editing. Heng Dong: Investigation, Formal analysis, Writing - original draft and Validation. Kai Liu: Conceptualization, Methodology. Yingdie Zheng: Investigation. Michael R. Hoffmann: Writing - review & editing. Weiping Liu: Funding acquisition, Resources, Project administration, Supervision. Writing - review & editing. The authors declare that they have no known competing financial interests.
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China21777137
National Natural Science Foundation of China21621005
Bill and Melinda Gates FoundationINV003227
China Scholarship CouncilUNSPECIFIED
Subject Keywords:Water treatment; 2-electron ORR; Advanced oxidation process; Carbon-based catalyst
Record Number:CaltechAUTHORS:20210308-143227657
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210308-143227657
Official Citation:Menglin Yu, Heng Dong, Kai Liu, Yingdie Zheng, Michael R. Hoffmann, Weiping Liu, Porous carbon monoliths for electrochemical removal of aqueous herbicides by “one-stop” catalysis of oxygen reduction and H2O2 activation, Journal of Hazardous Materials, Volume 414, 2021, 125592, ISSN 0304-3894, https://doi.org/10.1016/j.jhazmat.2021.125592. (https://www.sciencedirect.com/science/article/pii/S0304389421005550)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108349
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 Mar 2021 22:43
Last Modified:24 Mar 2021 14:12

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