Rare-Earth–Based Perovskite Photocatalytic Oxides: Fundamentals, Properties and Applications
Abstract
Rare-earth perovskite-type oxides (REBO₃, where RE represents a rare-earth element and B corresponds to a transition metal) have gained increasing attention as multifunctional materials for photocatalytic applications. Their interest stems from the inherent structural adaptability of the perovskite lattice, which confers high chemical stability and allows fine-tuning of electronic properties. The ability to substitute cations at both the A and B crystallographic sites provides an effective route to tailor band gap energies, enhance charge transport, and adjust redox behavior. The introduction of rare-earth ions has been shown to improve visible-light responsiveness and facilitate the separation of photogenerated electron–hole pairs, often through the creation of oxygen vacancies, lattice distortions, and f–d electronic interactions. As a result, these materials have demonstrated strong potential in photocatalytic processes related to environmental remediation, including the degradation of organic dyes, pharmaceutical residues, and antibiotics in aqueous media.
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