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Impact of Deashing Treatment on Biochar Structural Properties and Potential Sorption Mechanisms of Phenanthrene

Sun, Ke, Kang, Mingjie, Zhang, Zheyun, Jin, Jie, Wang, Ziying, Pan, Zezhen, Xu, Dongyu, Wu, Fengchang, Xing, Baoshan·2013·Environmental Science & Technology

Abstract

Knowledge of the mineral effects of biochars on their sorption of hydrophobic organic contaminants (HOCs) is limited. Sorption of phenanthrene (PHE) by plant-residue derived biochars (PLABs) and animal waste-derived biochars (ANIBs) obtained at two heating treatment temperatures (HTTs) (450 and 600 °C) and their corresponding deashed biochars was investigated. The decreased surface polarity and increased bulk polarity of biochars after deashing treatment indicated that abundant minerals of biochars benefit external exposure of polar groups associated organic matter (OM). Organic carbon (OC)-normalized distribution coefficients (K(oc)) of PHE by biochars generally increased after deashing, likely due to enhancement of favorable and hydrophobic sorption sites caused by mineral removal. Positive correlation between PHE log K(oc) by PLABs and bulk polarity combined with negative correlation between PHE log K(oc) values by ANIBs and surface polarity suggested PLABs and ANIBs have different sorption mechanisms, probably attributed to their large variation of ash content because minerals influenced OM spatial arrangement within biochars. Results of this work could help us better understand the impact of minerals, bulk/surface polarity, and sorption domain arrangement of biochars on their HOCs sorption and predict the fate of HOCs in soils after biochar application.

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Metadata

Authors
Sun, K., Kang, M., Zhang, Z., Jin, J., Wang, Z., Pan, Z., Xu, D., Wu, F., & Xing, B.
Venue
Environmental Science & Technology
Published
2013-09-25
Volume
47
Issue
20
Pages
11473-11481
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W2318880614
Cited by
271
References
8
FWCI
9.59
Type
journal article
Language
en
Open access
closed

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