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Atomically Dispersed Cobalt Sites on Graphene as Efficient Periodate Activators for Selective Organic Pollutant Degradation
Abstract
Abstract Pollutant degradation via periodate (IO4–)-based advanced oxidation processes (AOPs) provides an economical, energy-efficient way for sustainable pollution control. Although single-atomic metal activation (SMA) can be exploited to optimize the pollution degradation process and understand the associated mechanisms governing IO4–-based AOPs, studies on this topic are rare. Herein, we demonstrated the first instance of using SMA for IO4– analysis by employing atomically dispersed Co active sites supported by N-doped graphene (N-rGO-CoSA) activators. N-rGO-CoSA efficiently activated IO4– for organic pollutant degradation over a wide pH range without producing radical species. The IO4– species underwent stoichiometric decomposition to generate the iodate (IO3–) species. Whereas Co2+ and Co3O4 could not drive IO4– activation; the Co–N coordination sites exhibited high activation efficiency. The conductive graphene matrix reduced the contaminants/electron transport distance/resistance for these oxidation reactions and boosted the activation capacity by working in conjunction with metal centers. The N-rGO-CoSA/IO4– system exhibited a substrate-dependent reactivity that was not caused by iodyl (IO3·) radicals. Electrochemical experiments demonstrated that the N-rGO-CoSA/IO4– system decomposed organic pollutants via electron-transfer-mediated nonradical processes, where N-rGO-CoSA/periodate* metastable complexes were the predominant oxidants, thereby opening a new avenue for designing efficient IO4– activators for the selective oxidation of organic pollutants.
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Cited by
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Metadata
- Authors
- Long, Y., Dai, J., Zhao, S., Su, Y., Wang, Z., & Zhang, Z.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2021-03-17
- Volume
- 55
- Issue
- 8
- Pages
- 5357-5370
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W3136538949
- Cited by
- 304
- References
- 54
- FWCI
- 13.86
- Type
- journal article
- Language
- en
- Open access
- closed
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