pH Dependence of Arsenic Oxidation by Rice-Husk-Derived Biochar: Roles of Redox-Active Moieties
Open accessAbstract
Biochars have demonstrated great potential for water decontamination and soil remediation; however, their redox reactivity toward trace contaminants and the corresponding redox-active moieties (RAMs, i.e., phenolic −OH, semiquinone-type persistent free radicals (PFRs), and quinoid C═O) remain poorly understood. Here we investigated the roles of the RAMs on biochar in oxidation of As(III) under varying pH and O 2 conditions. The results showed that the promoted oxidation of As(III) by the RAMs is strongly pH dependent. Under acidic and neutral conditions, only the oxidation of As(III) by •OH and H 2 O 2 produced from activation of O 2 by phenolic −OH and semiquinone-type PFRs occurred. In contrast, the oxidation by semiquinone-type PFRs, quinoid C═O, and H 2 O 2 (if O 2 was introduced) appeared under alkaline conditions. This pH-dependent oxidation behavior was attributed to the varying redox activities of RAMs, as confirmed by multiple characterization and validation experiments using biochar with tuned RAMs compositions, as well as thermodynamics evaluation. Our findings provide new insights into the roles of the RAMs on biochar in the promoted oxidation of trace As(III) over a broader pH range under both anoxic and oxic conditions. This study also paves a promising way to oxidize As(III) with biochar.
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Some typical RAMs, amino -NHx and phenolic -OH, with abundant unconfined electrons can contribute to degradation of pollutants.
“It is recognized that some typical RAMs, i.e., amino -NHx and phenolic -OH, with abundant unconfined electrons can contribute to the degradation of pollutants, 54”
From Sustainable remediation with an electroactive biochar system: mechanisms and perspectives (2020) · cites this paper as [54]
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Self-citationSustainable remediation with an electroactive biochar system: mechanisms and perspectives
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- Authors
- Zhong, D., Jiang, Y., Zhao, Z., Wang, L., Chen, J., Ren, S., Liu, Z., Zhang, Y., Tsang, D. C. W., & Crittenden, J. C.
- Affiliations
- Hong Kong Polytechnic University (HK)
- Huazhong University of Science and Technology (CN)
- Georgia Institute of Technology (US)
- Corresponding author
- Wang, Linling
- Zhang, Yanrong
- ORCID
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2019-07-02
- Volume
- 53
- Issue
- 15
- Pages
- 9034-9044
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2954391063
- Cited by
- 288
- References
- 49
- Citations by year
- 2026: 27 · 2025: 39 · 2024: 64 · 2023: 42 · 2022: 33 · 2021: 48 · 2020: 30 · 2019: 4
- FWCI
- 12.51
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Licence
- Locations
- Environmental Science & Technology (publishedVersion)
- PubMed (publishedVersion)
- PolyU Institutional Research Archive (Hong Kong Polytechnic University) (submittedVersion)
- Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
- Funders
- Ministry of Science and Technology of the People's Republic of China (2012AA06A304)
- Huazhong University of Science and Technology (2018QYTD05)
- China Scholarship Council (201806165010)
- National Natural Science Foundation of China (41671311)
- State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University (PCRRF18027)
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Arsenic contamination and mitigation
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Engineering › Biomedical Engineering › Environmental remediation with nanomaterials
- Keywords
- arsenic oxidation, arsenite, biochar, rice husk, pH dependence, phenolic hydroxyl groups, hydroxyl radicals, hydrogen peroxide, oxygen activation, trace contaminant removal, oxic and anoxic conditions
- MeSH terms
- Arsenic, Charcoal, Hydrogen Peroxide, Hydrogen-Ion Concentration, Oxidation-Reduction, Oryza
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