Cited by 509Adsorption and biosorption for pollutant removalToxic Organic Pollutants ImpactSoil Carbon and Nitrogen Dynamics

Catechol and Humic Acid Sorption onto a Range of Laboratory-Produced Black Carbons (Biochars)

Kasozi, Gabriel N., Zimmerman, Andrew R., Nkedi-Kizza, Peter, Gao, Bin·2010·Environmental Science & Technology

Abstract

Although the major influence of black carbon (BC) on soil and sediment organic contaminant sorption is widely accepted, an understanding of the mechanisms and natural variation in pyrogenic carbon interaction with natural organic matter (NOM) is lacking. The sorption of a phenolic NOM monomer (catechol) and humic acids (HA) onto BC was examined using biochars made from oak, pine, and grass at 250, 400, and 650 degrees C. Catechol sorption equilibrium occurred after 14 d and was described by a diffusion kinetic model, while HA required only 1 d and followed pseudo-second-order kinetics. Catechol sorption capacity increased with increasing biochar combustion temperature, from pine < oak < grass and from coarse < fine particle size. At lower catechol concentrations, sorption affinity (Freundlich constant, K(f)) was directly related to micropore surface area (measured via CO(2) sorptometry) indicating the predominance of specific adsorption. In contrast, HA exhibited an order of magnitude less sorption (0.1% versus 1%, by weight) due to its exclusion from micropores. Greater sorption of both catechol and HA occurred on biochars with nanopores, i.e. biochars made at higher temperatures. These findings suggest that addition of BC to soil, via natural fires or biochar amendments, will sequester abundant native OM through sorption.

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Crossref · 10.1021/es1014423

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  • Biochars with higher specific surface area (obtained at temperatures above 600 °C) have greater surface microporosity and increased CEC.

    “other studies have found that biochars with higher specific surface area (obtained at temperatures above 600 °C) have greater surface microporosity and increased CEC”

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Authors
Kasozi, G. N., Zimmerman, A. R., Nkedi-Kizza, P., & Gao, B.
Affiliations
  • University of Florida (US)
  • Department of Geological Sciences, University of Florida, 241 Williamson Hall, Gainesville, Florida 32611-2120, Department of Soil and Water Science, University of Florida, Gainesville, Florida, and Department of Agricultural and Biological Engineering, University of Florida, Gainesville, Florida
Corresponding author
Zimmerman, Andrew R.
Venue
Environmental Science & Technology
Published
2010-07-29
Volume
44
Issue
16
Pages
6189-6195
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W2081147875
Cited by
509
References
51
Citations by year
2026: 21 · 2025: 25 · 2024: 29 · 2023: 49 · 2022: 40 · 2021: 52 · 2020: 48 · 2019: 26 · 2018: 30 · 2017: 43 · 2016: 31 · 2015: 38 · 2014: 32 · 2013: 23 · 2012: 11
FWCI
14.61
Type
journal article
Language
en
Open access
closed
Locations
  • Environmental Science & Technology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Toxic Organic Pollutants Impact
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
Keywords
black carbon, biochar, catechol, humic acid, organic matter adsorption, pyrogenic carbon, natural organic matter, combustion temperature, micropore surface area, nanopores, diffusion kinetics, pseudo-second-order kinetics, Freundlich isotherm, biochar amendment
MeSH terms
Adsorption, Catechols, Charcoal, Environment, Poaceae, Humic Substances, Kinetics, Laboratories, Models, Chemical, Temperature, Pinus, Quercus, Soot

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