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Clay-Mediated Phototransformation
Alters the Molecular
Composition and Toxicity of Microplastic-Derived Dissolved Organic
Matter
Kaiyuan Ma (19440582)
Jiayan Wu (204411)
Quanyun Ye (25153785)
Leiye Sun (18272835)
Bo Li (112195)
Linqing Liu (236797)
Jieyu Liu (4951864)
Sheng Liu (279488)
Wencheng Wu (6953222)
Pingxiao Wu (2889998)
Xuetao Guo (5485454)
Zhi Dang (683027)
Biochemistry
Cell Biology
Genetics
Environmental Sciences not elsewhere classified
Chemical Sciences not elsewhere classified
Biological Sciences not elsewhere classified
Developmental Biology
Cancer
Inorganic Chemistry
Computational Biology
reactive oxygen species
oxygenated compositional regions
modulating radical generation
mediated phototransformation alters
decreased [< sup
6 %, respectively
1 </ sup
ss </ sub
extractable molecular formulas
7 %, respectively
molecular transformation
molecular composition
• oh
synergistic interaction
relative contribution
related candidates
quantitative analysis
potentially amplifying
mp pollution
maximum release
important contributor
icr ms
free systems
fluorescence intensity
findings demonstrate
features within
environmental weathering
environmental fate
detectable additive
broader profile
Microplastics (MPs) release complex dissolved organic
matter (MPs-DOM)
during environmental weathering, yet how clay minerals regulate MPs-DOM
release, molecular composition, and associated biological effects
remains unclear. Our study showed that montmorillonite (Mt) accelerated
the photodegradation of PS and PLA microplastics, increasing the maximum
release of MPs-DOM by 50.3% and 27.6%, respectively, while shifting
its composition toward greater molecular complexity, fluorescence
intensity, and aromaticity. Fourier transform ion cyclotron resonance
mass spectrometry (FT-ICR MS) revealed that Mt altered the distribution
of extractable molecular formulas, increasing the relative contribution
of features within more unsaturated and oxygenated compositional regions.
Quantitative analysis of reactive oxygen species (ROS) showed that
the synergistic interaction between MPs-DOM and Mt influenced ROS
production. Specifically, Mt increased [•OH]<sub>ss</sub> in
PS- and PLA-DOM by 136.8% and 88.7%, respectively, but decreased [<sup>1</sup>O<sub>2</sub>]<sub>ss</sub> by 32.7% and 13.6%, respectively,
indicating that •OH was an important contributor to molecular
transformation. The Mt-amended MPs-DOM exhibited a broader profile
of detectable additive-related candidates and induced greater bacterial
effects than Mt-free systems. These findings demonstrate that clay
minerals critically regulate the environmental fate of MPs-DOM by
modulating radical generation, potentially amplifying the persistence
and risks of MP pollution.
2026-10-01T00:00:00Z
Text
Journal contribution
10.1021/acs.est.6c04309.s001
https://figshare.com/articles/journal_contribution/Clay-Mediated_Phototransformation_Alters_the_Molecular_Composition_and_Toxicity_of_Microplastic-Derived_Dissolved_Organic_Matter/34040622
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