Efficient Peroxydisulfate Activation Process Not Relying on Sulfate Radical Generation for Water Pollutant Degradation
Open accessAbstract
Peroxydisulfate (PDS) is an appealing oxidant for contaminated groundwater and toxic industrial wastewaters. Activation of PDS is necessary for application because of its low reactivity. Present activation processes always generate sulfate radicals as actual oxidants which unselectively oxidize organics and halide anions reducing oxidation capacity of PDS and producing toxic halogenated products. Here we report that copper oxide (CuO) can efficiently activate PDS under mild conditions without producing sulfate radicals. The PDS/CuO coupled process is most efficient at neutral pH for decomposing a model compound, 2,4-dichlorophenol (2,4-DCP). In a continuous-flow reaction with an empty-bed contact time of 0.55 min, over 90% of 2,4-DCP (initially 20 μM) and 90% of adsorbable organic chlorine (AOCl) can be removed at the PDS/2,4-DCP molar ratio of 1 and 4, respectively. Based on kinetic study and surface characterization, PDS is proposed to be first activated by CuO through outer-sphere interaction, the rate-limiting step, followed by a rapid reaction with 2,4-DCP present in the solution. In the presence of ubiquitous chloride ions in groundwater/industrial wastewater, the PDS/CuO oxidation shows significant advantages over sulfate radical oxidation by achieving much higher 2,4-DCP degradation capacity and avoiding the formation of highly chlorinated degradation products. This work provides a new way of PDS activation for contaminant removal.
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Efficient PMS activation by CuO via a sustainable non-radical route has been discovered, but most researchers found it irreproducible.
“Since the discovery of efficient PMS activation by CuO via an appealing sustainable non-radical route, 136 many researchers have been devoted to exploiting this intriguing feature but most found it irreproducible.”
From Sustainable remediation with an electroactive biochar system: mechanisms and perspectives (2020) · cites this paper as [136]
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- Authors
- Zhang, T., Chen, Y., Wang, Y., Le Roux, J., Yang, Y., & Croué, J.-P.
- Affiliations
- King Abdullah University of Science and Technology (SA)
- Water Desalination and Reuse Center, King Abdullah University of Science and Technology, Thuwal 4700, Makkah, Kingdom of Saudi Arabia
- Curtin University (AU)
- Corresponding author
- Croué, Jean-Philippe
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-05-06
- Volume
- 48
- Issue
- 10
- Pages
- 5868-5875
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W1994402399
- Cited by
- 798
- References
- 37
- Citations by year
- 2026: 45 · 2025: 57 · 2024: 73 · 2023: 92 · 2022: 107 · 2021: 113 · 2020: 93 · 2019: 73 · 2018: 58 · 2017: 44 · 2016: 32 · 2015: 9 · 2014: 2
- FWCI
- 22.06
- Type
- journal article
- Language
- en
- Open access
- green
- enpc.hal.science
- Licence
- other-oa
- Locations
- Environmental Science & Technology (publishedVersion)
- PubMed (publishedVersion)
- HAL (submittedVersion, other-oa)
- eSpace (Curtin University) (submittedVersion)
- King Abdullah University of Science and Technology Repository (King Abdullah University of Science and Technology) (submittedVersion)
- Funders
- King Abdullah University of Science and Technology
- Water Desalination and Reuse Center, King Abdullah University of Science and Technology
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Water Treatment and Disinfection
- Physical Sciences › Environmental Science › Environmental Chemistry › Per- and polyfluoroalkyl substances research
- Keywords
- persulfate activation, copper oxide, 2,4-dichlorophenol, chlorinated organic pollutants, outer-sphere electron transfer, groundwater remediation, industrial wastewater treatment, oxidation kinetics
- MeSH terms
- Ethanol, Aluminum Hydroxide, Chlorides, Chlorophenols, Copper, Hydrogen-Ion Concentration, Kinetics, Osmolar Concentration, Oxidation-Reduction, Rheology, Solutions, Sulfates, Temperature, Water Pollutants
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