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Improved visible photocatalytic CO oxidation of CoTiO3 nanotubes by surface engineering and Au nanoparticle loading
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DOI：10.3389/fchem.2026.1884025.png)
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Abstract
En 中文
The tubular structure photocatalyst; known for its excellent light absorption and mass diffusion properties; represents an attractive class of photocatalytic materials for the removal of toxic gaseous pollutants. However; the availability of adsorption activation sites and the separation of photogenerated charges remain insufficient; making improvements in these aspects meaningful. In this study; CoTiO3 nanotubes (denoted as CTO) are fabricated by a coaxial electrospinning technique followed by molten salt treatment. Subsequently; oxygen vacancies (Ovs) are created within the CTO by a vacuum-assisted hydrogen reduction strategy using NaBH4. Meanwhile; ultrafine Au nanoparticles (NPs) are uniformly anchored onto the surface of CTOvs by an in situ frozen photodeposition strategy; producing Au-CTOvs. The optimized Au-CTOv photocatalyst exhibits 2.7-fold enhancement in CO photooxidation compared to pristine CTO and is superior to N-doped TiO2. The experimental results confirm that the exceptional photoactivity can be attributed to three synergistic factors: the construction of the void and tubular structure accelerates mass transfer; the creation of Ovs on the nanotubes facilitates CO adsorption; and the anchoring of Au NPs improves charge separation and O2 activation.
Keywords:
Au loading
CoTiO3 nanotube
electrospinning synthesis
oxygen vacancy
photocatalytic CO oxidation
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4.2
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8.3K
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3.2W
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