Temperature-controlled synthesis of MnNb2O6 by an easy sol-gel method and investigation of its photocatalytic properties.
| Author | Motta, Fabiana Villela da; Andrade Neto, Nivaldo Freire de; Duarte, Willian Nascimento; Silva, Ubiratan Correia; Delmonte, Maurício Roberto Bomio | |
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| Publisher | Journal of the Indian Chemical Society | |
| Date | 2025-11 | |
| Keywords | Sol-gel synthesis Heterostructures MnNb2O6 Photocatalysis | |
| Citation | ||
| Abstract | This study explores a facile synthesis of MnNb2O6 at 650, 800, and 950 °C and its photocatalytic activity in methylene blue (MB) degradation under UV light. XRD and Rietveld refinement showed secondary Mn2O3 and Nb2O5 phases at lower temperatures, with pure MnNb2O6 forming at 950 °C. FESEM revealed that higher calcination temperatures produced denser, prismatic particles. Photocatalytic tests showed low activity at pH 7 and pH 3 due to dominant adsorption, but significantly improved efficiency at pH 11, attributed to increased ∙OH radical formation. Scavenger experiments indicated enhanced photocatalysis with silver nitrate (e− scavenger) and citric acid (h+ scavenger), especially with silver nitrate. EPR analysis confirmed greater ∙OH and ∙O2− radical generation in the heterostructured sample (MNO650) than in the pure phase (MNO950), suggesting that structural defects and heterojunctions in MNO650 reduce electron-hole recombination, thus enhancing photocatalytic performance | |
| URI | https://repositorio.ufrn.br/handle/123456789/66136 | |
| Collections | CT - DEMAT - Artigos publicados em periódicos |
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