Characterization of bioenergy biochar and its utilization for metal/metalloid immobilization in contaminated soil
Abstract
This study is a comparison of the effect of biochar produced by bioenergy systems, via the pyrolysis and gasification processes, on the immobilization of metals/metalloids in soil. Because the processes for these two techniques vary, the feedstocks undergo different heating regimens and, as a result, their respective char products exhibit different physico-chemical properties. Therefore, this study focuses on (1) the characterization of derivative biochar from the bioenergy system to understand their features and (2) an exploration of various biochar impacts on the mobility of As and Pb in contaminated soil. The results showed bioenergy biochars (BBCs) performed well in mitigating Pb extractability (1 M ammonium acetate) with a Pb immobilization >80%, but unfavorably mobilized the bioavailable As, likely because of electrostatic repulsion and ion exchange competition. The BBC surface functional group would chemically bond with the As and remain stable against the pH change. An increment in aromatic carbon would effectively enhance cation-π interaction for Pb immobilization. Nevertheless, an amendment with richer condensed structure and higher inorganic minerals (Ca 2+, K+, Mg 2+, and Na+) can lead to better performance in retaining Pb.
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Biochar has an alkaline nature due to the presence of alkali and alkaline metals in feedstocks that are not volatilized during pyrolysis.
“Biochar has an alkaline nature due to the presence of alkali and alkaline metals in feedstocks that are not volatilized during pyrolysis (Yang et al. 2018).”
From Biochar and its importance on nutrient dynamics in soil and plant (2020) · cites this paper as Yang et al. 2018
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- Authors
- Yang, X., Igalavithana, A. D., Oh, S.-E., Nam, H., Zhang, M., Wang, C.-H., Kwon, E. E., Tsang, D. C. W., & Ok, Y. S.
- Affiliations
- Kangwon National University (KR)
- Korea Institute of Energy Research (KR)
- China Jiliang University (CN)
- National University of Singapore (SG)
- Sejong University (KR)
- Hong Kong Polytechnic University (HK)
- Korea University (KR)
- Corresponding author
- Ok, Yong Sik
- ORCID
- Venue
- Science of The Total Environment
- Publisher
- Elsevier BV
- Published
- 2018-11
- Volume
- 640-641
- Pages
- 704-713
- ISSN
- 0048-9697 (ISSN-L)
- OpenAlex
- W2806852312
- Cited by
- 163
- References
- 54
- Citations by year
- 2026: 8 · 2025: 16 · 2024: 17 · 2023: 30 · 2022: 22 · 2021: 21 · 2020: 22 · 2019: 22 · 2018: 5
- FWCI
- 6.57
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Science of The Total Environment (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
- Korea University
- National Research Foundation of Korea (NRF-2015R1A2A2A11001432)
- Topics
- Physical Sciences › Environmental Science › Pollution › Heavy metals in environment
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Environmental Science › Environmental Chemistry › Arsenic contamination and mitigation
- Keywords
- biochar, bioenergy, pyrolysis, gasification, metal immobilization, metalloids, arsenic, lead, contaminated soil, soil remediation, cation-π interactions, surface functional groups, aromatic carbon, soil amendment, electrostatic repulsion
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