We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
The Role of the Reactive Species Involved in the Photocatalytic Degradation of HDPE Microplastics Using C,N-TiO2 Powders
AI summary Read the abstract
Researchers used carbon and nitrogen co-doped titanium dioxide photocatalysts to degrade high-density polyethylene microplastics under simulated solar light, identifying hydroxyl radicals and superoxide anions as the primary reactive species responsible for surface oxidation and chain scission of the polymer.
Microplastics (MPs) are distributed in a wide range of aquatic and terrestrial ecosystems throughout the planet. They are known to adsorb hazardous substances and can transfer them across the trophic web. To eliminate MPs pollution in an environmentally friendly process, we propose using a photocatalytic process that can easily be implemented in wastewater treatment plants (WWTPs). As photocatalysis involves the formation of reactive species such as holes (h+), electrons (e-), hydroxyl (OH●), and superoxide ion (O2●-) radicals, it is imperative to determine the role of those species in the degradation process to design an effective photocatalytic system. However, for MPs, this information is limited in the literature. Therefore, we present such reactive species' role in the degradation of high-density polyethylene (HDPE) MPs using C,N-TiO2. Tert-butanol, isopropyl alcohol (IPA), Tiron, and Cu(NO3)2 were confirmed as adequate OH●, h+, O2●- and e- scavengers. These results revealed for the first time that the formation of free OH● through the pathways involving the photogenerated e- plays an essential role in the MPs' degradation. Furthermore, the degradation behaviors observed when h+ and O2●- were removed from the reaction system suggest that these species can also perform the initiating step of degradation.
More Papers Like This
Identification of the reactive species involved in the photocatalytic degradation of PE microplastics
AI summary Read the abstract
Researchers investigated the reactive oxygen species responsible for photocatalytic degradation of polyethylene microplastics using C,N-TiO2, employing tert-butanol, isopropyl alcohol, Tiron, and copper nitrate as scavengers for hydroxyl radicals, holes, superoxide, and electrons respectively. Results revealed that free hydroxyl radicals generated via specific pathways play the primary role in PE microplastic degradation, advancing understanding of photocatalysis as a water treatment strategy for microplastic remediation.
First Insights into Photocatalytic Degradation of HDPE and LDPE Microplastics by a Mesoporous N–TiO2 Coating: Effect of Size and Shape of Microplastics
AI summary Read the abstract
A nitrogen-doped titanium dioxide photocatalyst successfully degraded high-density and low-density polyethylene microplastics under visible light, with smaller particles showing greater degradation than larger ones or film-shaped particles. The study establishes a foundation for visible-light photocatalysis as a potential strategy for removing microplastics from water.
Microplastic pollution reduction by a carbon and nitrogen-doped TiO2: Effect of pH and temperature in the photocatalytic degradation process
AI summary Read the abstract
Scientists tested a carbon and nitrogen-doped TiO2 photocatalyst for degrading microplastics and found that degradation efficiency depended strongly on pH and temperature, with optimal conditions achieving significant surface mineralization of tested polymer types.
Photocatalytic Degradation of Macro—and Microplastics Using Titanium Dioxide (TiO₂)
AI summary Read the abstract
This review assessed titanium dioxide (TiO2) photocatalysis as a method for degrading macro- and microplastics, finding that UV-activated TiO2 can break polymer chains through reactive oxygen species under controlled conditions. Scalable photocatalytic degradation is a compelling remediation strategy because it can destroy microplastics rather than relocate them, potentially reducing the volume of particles available for human ingestion and environmental accumulation.
Photocatalytic degradation of polyethylene microplastics by copper-doped titanium dioxide nanoparticles
AI summary Read the abstract
Researchers investigated photocatalytic degradation of polyethylene microplastics using copper-doped titanium dioxide nanoparticles as an efficient approach to breaking down aquatic plastic pollution, addressing the limitations of conventional removal methods that only achieve surface-level reduction.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.