Concurrent adsorption and micro-electrolysis of Cr(VI) by nanoscale zerovalent iron/biochar/Ca-alginate composite
Open accessAbstract
This study introduced a new approach for simultaneously enhancing Cr(VI) removal performance and mitigating release of dissolved Fe during nanoscale zero-valent iron (nZVI)-mediated reactions. After entrapping nZVI-impregnated biochar (BC) in the matrix of calcium-alginate (CA) bead, the physicochemical characterization of nZVI/BC/CA composites revealed that nZVI/BC particles were embedded inside CA having a spherical shape and several cracks on its outer layer. The multi-functionality of nZVI/BC/CA composites consisting of reductant (nZVI), porous adsorbent (BC), and external screening layer (CA) enhanced the removal of Cr(VI) with the maximum adsorption capacity of 86.4 mg/g (based on the Langmuir isotherm) and little release of dissolved Fe. With the XPS analysis and fitting results of kinetics (pseudo second order) and isotherms (Redlich-Peterson model), plausible removal mechanisms of Cr(VI) were simultaneous adsorption and micro-electrolysis reactions by nZVI/BC/CA composites. The practical applicability of nZVI/BC/CA composites was further demonstrated through the fixed-bed column experiments. These results provide new insights into the design of high-performance engineered biochar for wastewater treatment.
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Owing to the inherent redox potential difference between Fe0 and Cr(VI), free electrons entrapped within the hierarchical structure could be excited to transfer outwards along conjugated carbon units.
“the free electrons entrapped within the hierarchical structure could be excited to transfer outwards along the conjugated carbon units.23”
From Sustainable remediation with an electroactive biochar system: mechanisms and perspectives (2020) · cites this paper as [23]
Wan et al. found that biochar structure appeared to conduct free-flowing electrons from entrapped ZVI to an exterior electron acceptor, Cr(VI), via a micro-electrolysis process.
“Wan et al. found that the biochar structure appeared to conduct the free-flowing electrons from the entrapped ZVI to exterior electron acceptor (i.e., Cr(Ⅵ)) via micro-electrolysis process.”
From Sustainable remediation with an electroactive biochar system: mechanisms and perspectives (2020) · cites this paper as [23]
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Self-citation
- Authors
- Wan, Z., Cho, D.-W., Tsang, D. C. W., Li, M., Sun, T., & Verpoort, F.
- Affiliations
- Hong Kong Polytechnic University (HK)
- Wuhan University of Technology (CN)
- Tongji University (CN)
- Corresponding author
- Tsang, Daniel C.W.
- Venue
- Environmental Pollution
- Publisher
- Elsevier BV
- Published
- 2019-04
- Volume
- 247
- Pages
- 410-420
- ISSN
- 0269-7491 (ISSN-L)
- OpenAlex
- W2908816201
- Cited by
- 192
- References
- 47
- Citations by year
- 2026: 8 · 2025: 17 · 2024: 23 · 2023: 14 · 2022: 54 · 2021: 27 · 2020: 36 · 2019: 12 · 2016: 1
- FWCI
- 11.35
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Licence
- cc-by-nc-nd
- www.elsevier.com/tdm/userlicense/1.0/ (tdm)
- Locations
- Environmental Pollution (publishedVersion)
- PubMed (publishedVersion)
- PolyU Institutional Research Archive (Hong Kong Polytechnic University) (submittedVersion, cc-by-nc-nd)
- Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
- Funders
- National Natural Science Foundation of China (51208397)
- Central Universities (2017II29GX)
- Key Technology R&D Program of Hubei Province (2015BCA304)
- Hong Kong Research Grants Council (PolyU 15217818, E-PolyU503/17)
- Tongji University
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Environmental remediation with nanomaterials
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Chemistry › Organic Chemistry › Nanomaterials for catalytic reactions
- Keywords
- hexavalent chromium removal, nanoscale zero-valent iron, biochar, calcium alginate beads, micro-electrolysis, adsorption, engineered biochar, heavy metal removal, fixed-bed column, wastewater treatment
- MeSH terms
- Adsorption, Alginates, Calcium, Charcoal, Chromium, Electrolysis, Iron, Kinetics, Models, Chemical, Water Pollutants, Chemical
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