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Visible-Light-Driven Photocatalytic Hydrogen Production from Polystyrene Nanoplastics Using Pd/TiO2 Nanoparticles
Summary
Researchers developed a light-driven photocatalyst using palladium on titanium dioxide nanoparticles that can simultaneously break down polystyrene nanoplastics and produce hydrogen gas. The best-performing catalyst generated significant hydrogen output while also reducing the size of the plastic particles. The study demonstrates a dual-benefit approach that could address nanoplastic water pollution while generating clean energy.
The accumulation of microplastics and nanoplastics in aquatic environments has raised significant concerns in recent years, given the potential health risks to both aquatic ecosystems and humans; due to their nanometer size, they enter the food chain of aquatic species and consequently that of humans too. This study presents an efficient plasmonic photocatalyst for degrading polystyrene nanoplastics (PS NPs), while simultaneously generating green hydrogen in the process. Blank controls show that the presence of PS NPs is necessary for H2 evolution, since under identical conditions, it does not occur in their absence. A series of visible light-responsive plasmonic photocatalysts consisting of TiO2 nanoparticles (NPs) supporting Pd, Au, Pt, and Ag NPs were prepared via the impregnation method. Among the synthesized nanoparticle photocatalysts, the 3 wt % Pd/TiO2 NP photocatalyst exhibited superior hydrogen generation, producing 1329.76 μmolH2 gcat -1 after 2 h of irradiation, while also achieving a reduction in the average PS NP diameter. This study illustrates the potential of solar NP photocatalysis for environmental remediation and simultaneous hydrogen evolution.