Magnetite impregnation effects on the sorbent properties of activated carbons and biochars
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This paper discusses the sorbent properties of magnetic activated carbons and biochars produced by wet impregnation with iron oxides. The sorbents had magnetic susceptibilities consistent with theoretical predictions for carbon-magnetite composites. The high BET surface areas of the activated carbons were preserved in the synthesis, and enhanced for one low surface area biochar by dissolving carbonates. Magnetization decreased the point of zero charge. Organic compound sorption correlated strongly with BET surface areas for the pristine and magnetized materials, while metal cation sorption did not show such a correlation. Strong sorption of the hydrophobic organic contaminant phenanthrene to the activated carbon or biochar surfaces was maintained following magnetite impregnation, while phenol sorption was diminished, probably due to enhanced carbon oxidation. Copper, zinc and lead sorption to the activated carbons and biochars was unchanged or slightly enhanced by the magnetization, and iron oxides also contributed to the composite metal sorption capacity. While a magnetic biochar with 219 ± 3.7 m(2)/g surface area nearly reached the very strong organic pollutant binding capacity of the two magnetic activated carbons, a magnetic biochar with 68 ± 2.8 m(2)/g surface area was the best metal sorbent. Magnetic biochars thus hold promise as more sustainable alternatives to coal-derived magnetic activated carbons.
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BCZ has magnetic characteristics that benefit copper adsorption.
“BCZ does have magnetic characteristics [52,53] which benefit copper adsorption, but the increased surface area of BCL has more effect on removal efficiency.”
From Application of Biochar in Stormwater Treatment: Experimental and Modeling Investigation (2021) · cites this paper as [52]
Section 3.2.2 (p. 16) says magnetite contributes to some extent to copper sorption by the paper’s MagOrgBio composites. The paper does not identify or test BCZ, so it cannot establish that BCZ’s magnetic characteristics benefit its copper adsorption. (LLM, conf=0.85)
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References 43 · Cited by 206
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- Authors
- Han, Z., Sani, B., Mrozik, W., Obst, M., Beckingham, B., Karapanagioti, H. K., & Werner, D.
- Affiliations
- Chinese Academy of Geological Sciences (CN)
- Newcastle University (GB)
- Gdańsk Medical University (PL)
- University of Tübingen (DE)
- College of Charleston (US)
- University of Patras (GR)
- Corresponding author
- Werner, David
- ORCID
- Venue
- Water Research
- Publisher
- Elsevier BV
- Published
- 2015-03
- Volume
- 70
- Pages
- 394-403
- ISSN
- 0043-1354 (ISSN-L)
- OpenAlex
- W2053587662
- Cited by
- 206
- References
- 43
- Citations by year
- 2026: 17 · 2025: 11 · 2024: 13 · 2023: 19 · 2022: 31 · 2021: 20 · 2020: 22 · 2019: 17 · 2018: 18 · 2017: 17 · 2016: 17 · 2015: 4
- FWCI
- 9.61
- Type
- journal article
- Language
- en
- Open access
- green
- doi.org
- Licence
- Locations
- Water Research (publishedVersion)
- PubMed (publishedVersion)
- ERef Bayreuth (University of Bayreuth) (submittedVersion)
- Newcastle University ePrints (Newcastle Univesity) (cc-by-nc)
- Funders
- China Scholarship Council (2011813066)
- Royal Academy of Engineering (1314RECI002)
- China Geological Survey (12120113102700)
- Nigerian Petroleum Technology Development Fund
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Engineering › Biomedical Engineering › Environmental remediation with nanomaterials
- Physical Sciences › Environmental Science › Water Science and Technology › Coagulation and Flocculation Studies
- Keywords
- magnetic activated carbon, magnetic biochar, sorption, point of zero charge, BET surface area, phenol sorption, metal cation sorption, copper, zinc, lead, carbon oxidation, organic pollutant removal
- MeSH terms
- Adsorption, Charcoal, Waste Disposal, Fluid, Water Pollutants, Chemical, Ferrosoferric Oxide
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