Fast peroxydisulfate oxidation of the antibiotic norfloxacin catalyzed by cyanobacterial biochar
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Fast peroxydisulfate oxidation of the antibiotic norfloxacin catalyzed by cyanobacterial biochar. / Wang, Chen; Hansen, Hans Christian Bruun; Andersen, Mogens Larsen; Strobel, Bjarne W.; Ma, Hui; Dodge, Nadia; Jensen, Poul Erik; Lu, Changyong; Holm, Peter E.
In: Journal of Hazardous Materials, Vol. 439, 129655, 2022.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Fast peroxydisulfate oxidation of the antibiotic norfloxacin catalyzed by cyanobacterial biochar
AU - Wang, Chen
AU - Hansen, Hans Christian Bruun
AU - Andersen, Mogens Larsen
AU - Strobel, Bjarne W.
AU - Ma, Hui
AU - Dodge, Nadia
AU - Jensen, Poul Erik
AU - Lu, Changyong
AU - Holm, Peter E.
N1 - Publisher Copyright: © 2022 The Authors
PY - 2022
Y1 - 2022
N2 - Peroxydisulfate (PDS) is a common oxidant for organic contaminant remediation. PDS is typically activated by metal catalysts to generate reactive radicals. Unfortunately, as radicals are non-selective and metal catalysts may cause secondary contamination, alternative selective non-radical pathways and non-metal catalysts need attention. Here we investigated PDS oxidation of commonly detected antibiotic Norfloxacin (NOR) using cyanobacterial nitrogen rich biochars (CBs) as catalysts. NOR was fully degraded by CB pyrolysed at 950 °C (CB950) within 120 min. CB950 caused threefold faster degradation than low pyrolysis temperature (PT) CBs and achieved a maximum surface area normalized rate constant of 4.38 × 10−2 min−1 m−2 L compared to widely used metal catalysts. CB950 maintained full reactivity after four repeated uses. High defluorination (82%) and mineralization (>82%) were observed for CB950/PDS. CBs were active over a broad pH range (3−10), but with twice as high rates under alkaline compared with neutral conditions. NOR is degraded by organic, •OH and SO4•− radicals in low PT CBs/PDS systems, where the presence of MnII promotes radical generation. Electron transfer reactions with radicals supplemented dominate high PT CBs/PDS systems. This study demonstrates high PT biochars from algal bloom biomass may find use as catalysts for organic contaminant oxidation.
AB - Peroxydisulfate (PDS) is a common oxidant for organic contaminant remediation. PDS is typically activated by metal catalysts to generate reactive radicals. Unfortunately, as radicals are non-selective and metal catalysts may cause secondary contamination, alternative selective non-radical pathways and non-metal catalysts need attention. Here we investigated PDS oxidation of commonly detected antibiotic Norfloxacin (NOR) using cyanobacterial nitrogen rich biochars (CBs) as catalysts. NOR was fully degraded by CB pyrolysed at 950 °C (CB950) within 120 min. CB950 caused threefold faster degradation than low pyrolysis temperature (PT) CBs and achieved a maximum surface area normalized rate constant of 4.38 × 10−2 min−1 m−2 L compared to widely used metal catalysts. CB950 maintained full reactivity after four repeated uses. High defluorination (82%) and mineralization (>82%) were observed for CB950/PDS. CBs were active over a broad pH range (3−10), but with twice as high rates under alkaline compared with neutral conditions. NOR is degraded by organic, •OH and SO4•− radicals in low PT CBs/PDS systems, where the presence of MnII promotes radical generation. Electron transfer reactions with radicals supplemented dominate high PT CBs/PDS systems. This study demonstrates high PT biochars from algal bloom biomass may find use as catalysts for organic contaminant oxidation.
KW - Antibiotic
KW - Biochar
KW - Electron transfer
KW - Persulfate
KW - Radical
U2 - 10.1016/j.jhazmat.2022.129655
DO - 10.1016/j.jhazmat.2022.129655
M3 - Journal article
C2 - 35901634
AN - SCOPUS:85134935461
VL - 439
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
SN - 0304-3894
M1 - 129655
ER -
ID: 315772940