Abstract In this work, the Layered Double Hydroxide (LDH) containing magnesium (Mg) and iron (Fe) was modified with Mn to investigate the effect of the addition from the structural and catalytic point of view. These materials were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption-desorption isotherms, X-ray photoelectron spectroscopy (XPS), thermogravimetric analyses, and evaluated as heterogeneous catalysts in Fenton-like reaction. The results showed that the Mn was incorporated in the LDH, promoting structural changes such as reduction of crystallographic parameters, decrease of crystallite size, and increase of surface area. The removal of methylene blue (MB) in aqueous solutions by LDH with and without Mn showed better results with increasing catalyst dosage, H2O2 volume, and temperature; and that under the best reaction conditions, the MnMgFe-LDH was the catalyst more efficient in removing MB, being reused for 5 reaction cycles with more than 80% removal.

中文翻译：

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使用 Mg/Fe 和 MnMg/Fe 层状双氢氧化物作为可重复使用的催化剂对亚甲蓝进行类芬顿降解

摘要 在这项工作中，含有镁 (Mg) 和铁 (Fe) 的层状双氢氧化物 (LDH) 用 Mn 改性，从结构和催化的角度研究了添加的影响。这些材料通过 X 射线粉末衍射 (XRD)、扫描电子显微镜 (SEM)、N2 吸附-解吸等温线、X 射线光电子能谱 (XPS)、热重分析进行表征，并评估为类芬顿反应中的非均相催化剂。结果表明，Mn 掺入 LDH 中，促进了结构变化，如晶体参数的降低、微晶尺寸的减小和表面积的增加。随着催化剂用量、H2O2 体积和温度的增加，含有和不含 Mn 的 LDH 对水溶液中亚甲蓝 (MB) 的去除效果更好；