Table · dataset · 2026
Molecular Fingerprint-Dependent Retention and Fractionation of Combustion-Derived Dissolved Organic Matter on Kaolinite and Montmorillonite
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The environmental fate of combustion-derived dissolved organic matter (CDOM) at clay mineral interfaces remains poorly understood.
Description
We applied FT-ICR-MS, XPS, and other techniques to investigate the interfacial behavior of CDOM from coal, charcoal, pinewood, and maize straw on kaolinite and montmorillonite. Two distinct mechanisms were identified: ligand exchange on kaolinite (increasing binding energies by 1.2 ∼ 1.7 eV) and Ca<sup>2+</sup>/Mg<sup>2+</sup>-mediated cation bridging on montmorillonite (decreasing binding energies by 0.3 ∼ 1.8 eV).
Maize straw-CDOM and charcoal-CDOM exhibited the highest adsorption on both clays, while pinewood-CDOM showed mineral-selective retention (montmorillonite only) and coal-CDOM showed negligible adsorption. Coal-CDOM (−SO<sub>3</sub>H-rich) with negligible adsorption was due to electrostatic repulsion and hydration steric hindrance. Pinewood-CDOM (phenolic) was retained only on montmorillonite via cation bridging, as its phenolic groups cannot undergo ligand exchange with kaolinite.
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Charcoal-CDOM (−NH<sub>2</sub>-rich) was retained on both clays primarily through electrostatic attraction of –NH<sub>3</sub><sup>+</sup>, with additional contributions from Ca<sup>2+</sup>/Mg<sup>2+</sup>-mediated cation bridging and cation–π interactions on montmorillonite. Maize straw-CDOM (mixed –COOH, –NH<sub>2</sub>, –SO<sub>3</sub>H) was retained through synergistic ligand exchange, cation bridging, and electrostatic/H-bonding.
Concentration-dependent fractionation shifted from H-bonding/electrostatic attraction (small polar molecules) to hydrophobic/cation–π interactions (large aromatic molecules) with increasing concentration. This framework provides mechanistic context for pyrogenic carbon sequestration and contaminant mobility in clay-rich environmental matrices.
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Where it is published
- DOI doi.org/10.1021/acs.est.6c07762.s001 ↗
DOI / persistent id · from zivahub uct ac za
Catalogue records · 1
- OAI-PMH record api.figshare.com/v2/oai?verb=GetRecord&metadataPrefix=oai_dc&identifier=oai%3Af… ↗
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Topics
- From keywords
- Astronomy & Astrophysics · Chemistry · Earth & Environmental Science · Ecology · Energy · Life Sciences · Plant biology
Provenance · 1 source records, 12 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| ZivaHub | oai:figshare.com:article/34028743 | 11 d ago | JSON v1 |
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|---|---|---|---|
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| concepts[field].anzsrc:group:3108 | mapping · zivahub uct ac za | vocabulary-mapper@1.0.0 | keywords['Plant Biology'] |
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| description | source · zivahub uct ac za | connector:zivahub_uct_ac_za@1.0.0 | /metadata/dc/description |
| license | source · zivahub uct ac za | connector:zivahub_uct_ac_za@1.0.0 | /metadata/dc/rights |
| publication_date | source · zivahub uct ac za | connector:zivahub_uct_ac_za@1.0.0 | |
| title | source · zivahub uct ac za | connector:zivahub_uct_ac_za@1.0.0 | /metadata/dc/title |