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Iron-DopedCarbon Nanotubes Facilitate ZnO InterfacialCharge Accumulation for Selective Singlet Oxygen Generation in Piezo-PhotocatalyticMicroplastics Upcycling
Summary
Scientists developed a new material that can break down real microplastic particles, pulled directly from facial cleansers, without needing to pre-treat them first, using light, vibration, and a special catalyst to trigger a targeted chemical reaction. This matters because microplastics from everyday products like exfoliating scrubs end up polluting waterways and, potentially, our bodies, and this method offers a more efficient way to break them down into less harmful byproducts rather than just letting them persist in the environment. While this is early-stage lab research, it points toward better future technologies for cleaning up plastic pollution before it accumulates in ecosystems and
Abstract Efficient catalytic upcycling of microplastics (MPs) remains challenging due to uncontrolled reactive oxygen species (ROS) evolution pathways and the reliance on predepolymerization of MPs prior to catalytic conversion. Here, we demonstrate that interfacial band engineering in an iron-doped carbon nanotube (CNFe)-mediated zinc oxide/carbon nitride (ZnO/DCN-Cg, ZCN) heterojunction enables selective ROS steering toward a dominant nonradical pathway. The ZCNCNFe nanocomposite, featuring N–Zn bonding, C–O–Zn coordination, and C–C conjugation, provides a structurally integrated platform that dynamically regulates interfacial charge transfer during peroxymonosulfate activation, resulting in singlet oxygen (1O2) as the dominant ROS with a high yield (67.71 μmol/L). Notably, real-world HDPE MPs (∼700 mg), directly extracted from commercial facial cleansers via a novel dual-density separation method, were selectively oxidized into oxygenated intermediates (e.g., carboxylic acids and esters) without any predepolymerization, rather than being fully mineralized (∼39.2 wt % weight loss, TOC = 14.06 mg/L), accompanied by pronounced surface erosion and fragmentation under piezo-photocatalysis. The introduction of CNFe triggers Fermi-level realignment to accelerate interfacial charge flux toward ZnO adsorption sites, promoting peroxo bond polarization and cleavage, driving the self-disproportionation of HSO5– to generate 1O2. This study establishes a charge-transfer-regulated framework for steering ROS pathways in piezo-photocatalytic systems, challenging conventional radical-dominated approaches for microplastics upcycling.