Cited by 286Phosphorus and nutrient managementAdsorption and biosorption for pollutant removalSoil Carbon and Nitrogen Dynamics

Aging induced changes in biochar's functionality and adsorption behavior for phosphate and ammonium

Mia, Shamim, Dijkstra, Feike A., Singh, Balwant·2017·Environmental Science & Technology

Abstract

Biochar, a form of pyrogenic carbon, can contribute to agricultural and environmental sustainability by increasing soil reactivity. In soils, biochar could change its role over time through alterations in its surface chemistry. However, a mechanistic understanding of the aging process and its role in ionic nutrient adsorption and supply remain unclear. Here, we aged a wood biochar (550 °C) by chemical oxidation with 5–15% H 2 O 2 and investigated the changes in surface chemistry and the adsorption behavior of ammonium and phosphate. Oxidation changed the functionality of biochar with the introduction of carboxylic and phenolic groups, a reduction of oxonium groups and the transformation of pyridine to pyridone. After oxidation, the adsorption of ammonium increased while phosphate adsorption decreased. Ammonium adsorption capacity was nonlinearly related to the biochar’s surface charge density ( r 2 = 0.94) while electrostatic repulsion and loss of positive charge due to destruction of oxonium and pyridine, possibly caused the reduced phosphate adsorption. However, the oxidized biochar substantially adsorbed both ammonium and phosphate when biochar derived organic matter (BDOM) was included. Our results suggest that aging of biochar could reverse its capacity for the adsorption of cationic and anionic species but the inclusion of BDOM could increase ionic nutrient and contaminant retention.

Integrity signals

Registry

Crossref · 10.1021/acs.est.7b00647

Cites

73 of 73 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Mia, S., Dijkstra, F. A., & Singh, B.
Affiliations
The University of Sydney (AU)
Corresponding author
Mia, Shamim
Venue
Environmental Science & Technology
Published
2017-07-11
Volume
51
Issue
15
Pages
8359-8367
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W2686070291
Cited by
286
References
73
Citations by year
2026: 33 · 2025: 32 · 2024: 31 · 2023: 33 · 2022: 37 · 2021: 47 · 2020: 30 · 2019: 31 · 2018: 11 · 2017: 1
FWCI
20.65
Type
journal article
Language
en
Open access
closed
Locations
  • Environmental Science & Technology (publishedVersion)
  • PubMed (publishedVersion)
  • RUNE (Research UNE) (submittedVersion)
Topics
  • Physical Sciences › Environmental Science › Waste Management and Disposal › Phosphorus and nutrient management
  • Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
Keywords
biochar aging, wood biochar, hydrogen peroxide oxidation, phosphate adsorption, ammonium adsorption, surface chemistry, surface charge density, electrostatic repulsion, soil nutrient retention, pollutant retention
MeSH terms
Adsorption, Charcoal, Hydrogen Peroxide, Phosphates, Soil, Ammonium Compounds

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review