Plant-substrate biochar properties critical for mediating reductive debromination of 1,2-dibromoethane
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Plant-substrate biochar properties critical for mediating reductive debromination of 1,2-dibromoethane. / Lindhardt, Jonathan H.; Holm, Peter E.; Zhu, Yong Guan; Lu, Changyong; Hansen, Hans Chr. Bruun.
I: Journal of Environmental Sciences, Bind 147, 2025.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Plant-substrate biochar properties critical for mediating reductive debromination of 1,2-dibromoethane
AU - Lindhardt, Jonathan H.
AU - Holm, Peter E.
AU - Zhu, Yong Guan
AU - Lu, Changyong
AU - Hansen, Hans Chr. Bruun
N1 - Publisher Copyright: © 2023
PY - 2025
Y1 - 2025
N2 - Dibromoethane is a widespread, persistent organic pollutant. Biochars are known mediators of reductive dehalogenation by layered FeII-FeIII hydroxides (green rust), which can reduce 1,2-dibromoethane to innocuous bromide and ethylene. However, the critical characteristics that determine mediator functionality are lesser known. Fifteen biochar substrates were pyrolyzed at 600 °C and 800 °C, characterized by elemental analysis, X-ray photo spectrometry C and N surface speciation, X-ray powder diffraction, specific surface area analysis, and tested for mediation of reductive debromination of 1,2-dibromoethane by a green rust reductant under anoxic conditions. A statistical analysis was performed to determine the biochar properties, critical for debromination kinetics and total debromination extent. It was shown that selected plant based biochars can mediate debromination of 1,2-dibromoethane, that the highest first order rate constant was 0.082/hr, and the highest debromination extent was 27% in reactivity experiments with 0.1 µmol (20 µmol/L) 1,2-dibromoethane, ≈ 22 mmol/L FeIIGR, and 0.12 g/L soybean meal biochar (7 days). Contents of Ni, Zn, N, and P, and the relative contribution of quinone surface functional groups were significantly (p < 0.05) positively correlated with 1,2-dibromoethane debromination, while adsorption, specific surface area, and the relative contribution of pyridinic N oxide surface groups were significantly negatively correlated with debromination.
AB - Dibromoethane is a widespread, persistent organic pollutant. Biochars are known mediators of reductive dehalogenation by layered FeII-FeIII hydroxides (green rust), which can reduce 1,2-dibromoethane to innocuous bromide and ethylene. However, the critical characteristics that determine mediator functionality are lesser known. Fifteen biochar substrates were pyrolyzed at 600 °C and 800 °C, characterized by elemental analysis, X-ray photo spectrometry C and N surface speciation, X-ray powder diffraction, specific surface area analysis, and tested for mediation of reductive debromination of 1,2-dibromoethane by a green rust reductant under anoxic conditions. A statistical analysis was performed to determine the biochar properties, critical for debromination kinetics and total debromination extent. It was shown that selected plant based biochars can mediate debromination of 1,2-dibromoethane, that the highest first order rate constant was 0.082/hr, and the highest debromination extent was 27% in reactivity experiments with 0.1 µmol (20 µmol/L) 1,2-dibromoethane, ≈ 22 mmol/L FeIIGR, and 0.12 g/L soybean meal biochar (7 days). Contents of Ni, Zn, N, and P, and the relative contribution of quinone surface functional groups were significantly (p < 0.05) positively correlated with 1,2-dibromoethane debromination, while adsorption, specific surface area, and the relative contribution of pyridinic N oxide surface groups were significantly negatively correlated with debromination.
KW - Biochar
KW - Environmental catalysis
KW - Environmental remediation
KW - Green rust
KW - Persistent organic pollutants (POPs)
U2 - 10.1016/j.jes.2023.09.018
DO - 10.1016/j.jes.2023.09.018
M3 - Journal article
AN - SCOPUS:85183461503
VL - 147
JO - Journal of Environmental Sciences
JF - Journal of Environmental Sciences
SN - 1001-0742
ER -
ID: 382753037