Hematite, as an extensive natural mineral with multiple crystal facets, profoundly affects the migration and transformation of pollutants in the natural environment. However, little is known about the photochemical behavior of microplastics on different facets of hematite in the aquatic environment. In this work, the photoaging of polystyrene microplastics (PS-MPs) on different crystal planes ({001}, {100}, and {012} facets) and related mechanisms were studied. Two-dimensional correlation spectroscopy analysis illustrated that the reaction pathways of PS-MPs photoaging on hematite tended to preferential chemical oxidization. The stronger performance of PS-MPs photoaging, expressed by particle size reduction and surface oxidation, was observed on the {012} crystal facet. Under irradiation, {012} facet-dominated hematite with a narrower bandgap (1.93 eV) reinforced the photogenerated charge carrier separation, and the lower activation energy barrier (1.41 eV calculated from density functional theory) led to effective •OH formation from water oxidation. These findings elucidate the underlying photoaging mechanism of MPs on hematite with different mineralogical phases.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10245329 | PMC |
| http://dx.doi.org/10.1016/j.wroa.2023.100185 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Natural Organic Matter Stabilizes Pristine Nanoplastics but Destabilizes Photochemical Weathered Nanoplastics in Monovalent Electrolyte Solutions.
Environ Sci Technol
January 2025
Section of Sanitary Engineering, Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands.
Photochemical weathering and eco-corona formation through natural organic matter (NOM) adsorption play vital roles in the aggregation tendencies of nanoplastics (NPs) in aquatic environments. However, it remains unclear how photochemical weathering alters the adsorption patterns of NOM and the conformation of the eco-corona, subsequently affecting the aggregation tendencies of NPs. This study examined the effect of Suwannee River NOM adsorption on the aggregation kinetics of pristine and photoaged polystyrene (PS) NPs in monovalent electrolyte solutions.
View Article and Find Full Text PDFInsights into the photoaging behavior of biodegradable and nondegradable microplastics: Spectroscopic and molecular characteristics of dissolved organic matter release.
J Hazard Mater
November 2024
Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China; International Joint Research Centre of Shaanxi Province for Pollutants Exposure and Eco-environmental Health, Xi'an 710119, China. Electronic address:
Article Synopsis
- - Biodegradable plastics, like polylactic acid (PLA), are being explored as alternatives to nondegradable plastics, but concerns about the ecological risks of biodegradable microplastics (MPs) are growing, especially regarding the dissolved organic matter (DOM) they release.
- - A study compared the photoaging behavior of PLA MPs and polystyrene (PS) MPs, finding that both types underwent significant changes when exposed to UV light, resulting in different color alterations due to changes in surface functional groups.
- - The research indicated that PLA MPs released a higher percentage of protein-like low molecular weight DOM, which is more readily used by microorganisms, potentially affecting microbial activity and the carbon cycle more than PS MPs.
Photoaging-induced variations in heteroaggregation of nanoplastics and suspended sediments in aquatic environments: A case study on nanopolystyrene.
Water Res
January 2025
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, PR China.
Photoaging of nanoplastics (NPs) and heteroaggregate with suspended sediments (SS) determines transport processes and ecological risks of NPs in aquatic environments. This study investigated the disruption of photoaging on the heteroaggregation behavior of polystyrene NPs (PSNPs) and SS in different valence electrolyte solutions and deduced the interaction mechanisms by integrating aggregation kinetics and molecular dynamics (MD) simulation. Increasing the electrolyte concentration significantly enhanced the heteroaggregation between PSNPs and SS, and the divalent electrolytes induced the heteroaggregation more efficiently.
View Article and Find Full Text PDFZinc-halide/phenylbutyrate co-passivation of CsPbX nanocrystals toward efficient and robust luminescence.
J Colloid Interface Sci
February 2025
School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300401, China. Electronic address:
Cesium lead halide perovskite nanocrystals (IPNCs) exhibit excellent optoelectronic properties but are susceptible to degradation in practical environments due to their ionic surface and unstable ligand capping. Here, we propose a post-synthesis surface passivation strategy for CsPbX (X = Br, I) IPNCs by employing combined zinc halide and zinc phenylbutyrate (Zn(PA)) as surface ligands. ZnBr fills surface halide vacancies on IPNCs, resulting in high photoluminescence efficiency, whereas Zn(PA) stabilizes IPNCs by substituting surface ammonium ligands.
View Article and Find Full Text PDFPolystyrene microplastics enhanced the photo-degradation and -ammonification of algae-derived dissolved organic matters.
J Hazard Mater
December 2024
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, PR China.
Article Synopsis
- Algae-derived organic matter (ADOM) is an important contributor to chromophoric dissolved organic matter (CDOM) in water, and its degradation when exposed to sunlight influences aquatic ecosystems.
- The study examines how the presence of microplastics (MPs), specifically polystyrene, affects the photodegradation of ADOM sourced from common algal species, revealing that MPs significantly accelerate this process.
- Findings indicate that the presence of PS microplastics increases the breakdown of amino acid-like substances and ammonia production, illuminating their role as environmental photosensitizers and their implications for aquatic carbon and nitrogen cycles.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!