Communications

¹²¹Sb Mössbauer spectroscopic insight into the puzzling persistence of photocatalytic activity exhibited by Sb-doped anatase TiO₂

M. V. Korolenko, D. A. Pankratov, I. M. Buntseva, P. B. Fabrichnyi

Department of Chemistry, M. V. Lomonosov Moscow State University, 119991 Moscow, Russian Federation

Аннотация: The unexpected behavior of Sb-doped anatase TiO₂ photocatalysts can be accounted for by their synthesis procedure involving thermal decomposition of a coprecipitated hydroxide precursor. This treatment results in the formation of titanium vacancies V_Ti which balance the excessive positive charge of Sb^V atoms in a way not affecting the wide-gap nature of anatase TiO₂ semiconductor. Nevertheless, V_Ti vacancies can also reduce its photocatalytic efficiency acting along with the oxygen ones V_O as supplementary recombination centers of photogenerated electrons and holes.

Ключевые слова: Sb-doped TiO₂, photocatalytic bleaching, methyl orange, ¹²¹Sb Mössbauer spectroscopy, Sb^v charge balance mechanism.

Поступила в редакцию: 01.04.2025
Принята в печать: 15.05.2025

Язык публикации: английский

DOI: 10.71267/mencom.7784

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