Niobium Oxide for Microplastics Degradation—the Effect of Crystal Structure and Morphology

Microplastic (MP) pollution is ubiquitous in the environment and there is a significant need for the development of photocatalysts for environmental remediation of microplastic pollution. Herein, the effect of the structure and morphology of Nb 2 O 5 nanostructures on their photocatalytic activity for MP degradation is investigated. Nanostructures with a high fraction of pseudohexagonal TT‐Nb 2 O 5 phase are shown to effectively degrade pure polyethylene, polypropylene, and polyester, as well as MP samples collected from the environment. Efficient photocatalytic degradation of the microplastics is attributed to the unique structure and morphology (TT‐Nb 2 O 5 nanoparticles on monoclinic Nb 2 O 5 rods), which facilitates charge separation and consequently photocatalytic activity. The Nb 2 O 5 nanostructures with optimal composition and morphology lead to efficient degradation of not only pure plastic particles with different compositions (polyethylene, polypropylene, and polyester) in up to 64 h, but also complete degradation of environmental microplastics in 56 h.