Chromium-substituted GdFeO3 perovskites for efficient visible-light photo-Fenton degradation of rhodamine B


Kenges K. Orazov Z. Torgaeva A. Tugova E.
2026John Wiley and Sons Inc

Journal of the Chinese Chemical Society
2026

Chromium-doped (1-х)GdFeO3 – хGdCrO3 (x = 0.2, 0.4, 0.5, 0.6, 0.8) perovskites were synthesized by high-temperature solid-state reaction and quantitatively correlated structure with photocatalytic performance. X-ray diffraction confirmed single-phase orthorhombic Pbnm solid solutions with lattice contraction upon Cr substitution and a deviation from Vegards law at x = 0.6; octahedral distortion (d) and in-plane strain (s) further showed an anomaly at x = 0.4. Under visible light (λ > 400 nm) with H2O2 (photo-Fenton conditions), Rhodamine B (RhB) degradation after 240 min spanned 32%–77% across the series, with the x = 0.6 composition giving the highest apparent rate constant k = (4.96 ± 0.09) × 10−3 min−1 (vs (2.38 ± 0.09) × 10−3 min−1 at x = 0.5 and (1.09 ± 0.05) × 10−3 min−1 for the blank). Control tests showed negligible conversion without either light or H2O2, whereas combining both with GFCO (x = 0.6) yielded 77% conversion in 240 min. Radical-quenching identified the active species: AgNO3 (e−) and EDTA-2Na (h+) reduced degradation to 34% and 24%, while trapping •OH, •O2− and 1O2 by IPA, TEMPOL, and NaN3 lowered it to 11%, 4%, and 9%, respectively, evidencing a •OH/•O2−/1O2-dominated pathway. The activity maximum at x = 0.6 correlates with the structural anomalies, indicating a defect-assisted visible-light photo-Fenton mechanism and defining the optimal Cr loading for pollutant decomposition.

Fenton-like catalysis , gadolinium ferrites , perovskite , photocatalysis

Text of the article Перейти на текст статьи

Center of Physical-Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Almaty, Kazakhstan
Kazakh National Womens Teacher Training University, Almaty, Kazakhstan
Ioffe Institute, St Petersburg, Russian Federation

Center of Physical-Chemical Methods of Research and Analysis
Kazakh National Womens Teacher Training University
Ioffe Institute

10 лет помогаем публиковать статьи Международный издатель

Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026