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Overcoming biochar limitations to remediate pentachlorophenol in soil by modifying its electrochemical properties

Chacón, Francisco J. and Cayuela, Maria L. and Cederlund, Harald and Sánchez-Monedero, Miguel A. (2022). Overcoming biochar limitations to remediate pentachlorophenol in soil by modifying its electrochemical properties. Journal of Hazardous Materials. 426 , 127805
[Research article]

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Abstract

In this study, we produced modified biochars with enhanced electrochemical properties to increase PCP remediation in soil. Although all biochars enhanced PCP remediation in aerobic conditions, only a few did in anaerobic soil. The most successful modifications were (i) the preloading of biomass with 10% w/w FeCl3, to obtain a biochar rich in redox-active metals (B-Fe); (ii) the oxidation of a conductive biochar pyrolyzed at 1000 ºC with 0.025 M KMnO4, to produce a biochar with both moderate conductivity and redox capacity (B-1000-KMnO4); and (iii) KMnO4 oxidation of an amorphous biochar pyrolyzed at 400 ºC to obtain a biochar with very high redox capacity (B-KMnO4). B-Fe reduced extractable PCP to almost zero after 50 days in both incubations, but showed slow kinetics of remediation in aerobic soil. B-1000-KMnO4 had the highest rate of remediation under aerobic conditions, but no significant effect under anaerobic conditions. B-KMnO4, however, presented high rates of remediation and high removal of extractable PCP under both conditions, which made it the recommended modification strategy for increased PCP remediation. We found that the degree of remediation primarily depends on the redox capacity, while the rate of remediation was determined by both the conductivity and redox capacity of biochar.

Authors/Creators:Chacón, Francisco J. and Cayuela, Maria L. and Cederlund, Harald and Sánchez-Monedero, Miguel A.
Title:Overcoming biochar limitations to remediate pentachlorophenol in soil by modifying its electrochemical properties
Series Name/Journal:Journal of Hazardous Materials
Year of publishing :2022
Volume:426
Article number:127805
Number of Pages:9
ISSN:0304-3894
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Keywords:Designer biochar, Pentachlorophenol, Soil remediation, Redox properties, Conductivity
URN:NBN:urn:nbn:se:slu:epsilon-p-114621
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-114621
Additional ID:
Type of IDID
DOI10.1016/j.jhazmat.2021.127805
Web of Science (WoS)000752501900004
ID Code:27250
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Molecular Sciences
Deposited By: SLUpub Connector
Deposited On:04 Mar 2022 06:25
Metadata Last Modified:04 Mar 2022 06:31

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