Temperature-controlled synthesis of MnNb2O6 by an easy sol-gel method and investigation of its photocatalytic properties

IF 3.4 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society Pub Date : 2025-09-26 DOI:10.1016/j.jics.2025.102149

Nivaldo F. Andrade Neto , Willian N. Duarte , Ubiratan C. Silva , Mauricio R.D. Bomio , Fabiana V. Motta

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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.

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溶胶-凝胶法制备MnNb2O6及其光催化性能研究

研究了在650、800和950℃条件下MnNb2O6的快速合成及其在紫外光下降解亚甲基蓝（MB）的光催化活性。XRD和Rietveld细化表明，在较低温度下，Mn2O3和Nb2O5次生相形成，950℃时形成纯MnNb2O6。FESEM显示，较高的煅烧温度产生更密集的棱柱状颗粒。光催化试验显示，在pH 7和pH 3下，由于主要吸附作用，活性较低，但在pH 11下，由于∙OH自由基形成增加，效率显著提高。清除剂实验表明，硝酸银（e−清除剂）和柠檬酸（h+清除剂）的光催化作用增强，特别是硝酸银。EPR分析证实，与纯相（MNO950）相比，异质结构样品（MNO650）中产生的∙OH和∙O2−自由基更多，这表明MNO650中的结构缺陷和异质结减少了电子-空穴复合，从而增强了光催化性能。

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来源期刊

Journal of the Indian Chemical Society 化学-化学综合

CiteScore

3.50

自引率

7.70%

发文量

492

审稿时长

3-8 weeks

期刊介绍： The Journal of the Indian Chemical Society publishes original, fundamental, theorical, experimental research work of highest quality in all areas of chemistry, biochemistry, medicinal chemistry, electrochemistry, agrochemistry, chemical engineering and technology, food chemistry, environmental chemistry, etc.