Effect of leaching time on phytotoxicity of dissolved organic matter derived from black carbon based on spectroscopy

Zhang, Ruju; Deng, Ze; Li, Jiulong; Zhang, Yunxian; Wei, Zimin; Cao, Hongtao

doi:10.1016/j.envpol.2022.119595

Cited by 4 publications

(2 citation statements)

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“…41,86 The ROS excited from DBC under radiation can not only degrade pollutants attached it 85 but may also lead to the degradation of DBC itself thereby releasing loaded pollutants back into the water column. 103 Therefore, the environmental behavior and fate of DBC and the pollutants it carried in aquatic ecosystems can be quite complex, which deserves more attention. The Hamaker constant derived in this study and its decay models are of particular importance for developing predictive models to quantitatively describe the fate and transport of DBC in aquatic environments.…”

Section: Environmental Implicationsmentioning

confidence: 99%

“…This means that in estuaries contaminants would be deposited with DBC, posing potential risks to sediment ecology. It is noteworthy that photoaging can alter the surface properties of DBC to affect its affinity and thus the amount and type of contaminants loaded. , The ROS excited from DBC under radiation can not only degrade pollutants attached it but may also lead to the degradation of DBC itself thereby releasing loaded pollutants back into the water column . Therefore, the environmental behavior and fate of DBC and the pollutants it carried in aquatic ecosystems can be quite complex, which deserves more attention.…”

Section: Environmental Implicationsmentioning

confidence: 99%

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New Insights into Aggregation Behaviors of the UV-Irradiated Dissolved Biochars (DBioCs) in Aqueous Environments: Effects of Water Chemistries and Variation in the Hamaker Constant

Tang,

Guo,

Zhu

et al. 2024

Environ. Sci. Technol.

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The aggregation behavior of ubiquitous dissolved black carbon (DBC) largely affects the fate and transport of its own contaminants and the attached contaminants. However, the photoaging processes and resulting effects on its colloidal stability remain yet unknown. Herein, dissolved biochars (DBioCs) were extracted from common wheat straw biochar as a proxy for an anthropogenic DBC. The influences of UV radiation on their aggregation kinetics were systematically investigated under various water chemistries (pH, electrolytes, and protein). The environmental stability of the DBioCs before and after radiation was further verified in two natural water samples. Hamaker constants of pristine and photoaged DBioCs were derived according to Derjaguin−Landau−Verwey−Overbeek (DLVO) prediction, and its attenuation (3.19 ± 0.15 × 10 −21 J to 1.55 ± 0.07 × 10 −21 J after 7 days of radiation) was described with decay kinetic models. Pearson correlation analysis revealed that the surface properties and aggregation behaviors of DBioCs were significantly correlated with radiation time (p < 0.05), indicating its profound effects. Based on characterization and experimental results, we proposed a three-stage mechanism (contended by photodecarboxylation, photooxidation, and mineral exposure) that DBioCs might experience under UV radiation. These findings would provide an important reference for potential phototransformation processes and relevant behavioral changes that DBC may encounter.

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