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首页> 外文期刊>Catalysis science & technology >Insight into the enhanced catalytic activity of a red mud based Fe2O3/Zn-Al layered double hydroxide in the photo-Fenton reaction
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Insight into the enhanced catalytic activity of a red mud based Fe2O3/Zn-Al layered double hydroxide in the photo-Fenton reaction

机译：洞察的增强的催化活性基于赤泥的Fe2O3 / Zn-Al分层的两倍photo-Fenton的氢氧化反应

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摘要

In this work, the catalytic activity of an Fe2O3/Zn-Al layered double hydroxide (F/ZA-LDH) in the photo-Fenton reaction has been studied in detail. The F/ZA-LDH composite exhibited significantly enhanced catalytic activity in a photo-Fenton system. The apparent rate constant of F/ZA-LDH in the photo-Fenton reaction was about 4 times higher than that of the pure Zn-Al LDH, and was about 10 times higher than that of the red mud, which was the main material for synthesized F/ZA-LDH. It was found that besides the increased surface area (45.64 m(3) g(-1)) and enhanced pore volume of the F/ZA-LDH composite, the suitable concentration of oxygen vacancies could account for the significantly enhanced catalytic activity of F/ZA-LDH. The oxygen vacancies favor the visible light absorption and the efficient charge separation and transfer of F/ZA-LDH. Moreover, density functional theory (DFT) calculations were used to explore the electronic structures of the as-prepared samples, and the photocatalytic activity of F/ZA-LDH was also analyzed based on the results of electronic structures. The F/ZA-LDH composite exhibited excellent settleability, good reusability and stability in use. Finally, the possible mechanisms involved in the photo-Fenton system catalyzed by F/ZA-LDH have been proposed. This work would provide a systematic understanding of the high catalytic activity of the Fe2O3/Zn-Al layered double hydroxide which has been prepared using bulk waste red mud as the main material via mechanochemical synthesis.
机译：在这部作品中,催化活性的Fe2O3 / Zn-Al层状双氢氧化物(F / ZA-LDH)photo-Fenton反应进行了研究细节。显著提高催化活性photo-Fenton系统。的F / ZA-LDH photo-Fenton反应约4倍的纯Zn-AlLDH,大约10倍的赤泥的主要材料合成F / ZA-LDH。增加的表面积(45.64米(3)g (1))增强的孔隙体积的F / ZA-LDH复合,合适的氧空位的浓度占显著增强吗F / ZA-LDH的催化活性。职位空缺可见光吸收和支持有效电荷分离和转移F / ZA-LDH。被用来探索(DFT)计算的电子结构和样品,和F / ZA-LDH的光催化活性分析了基于电子的结果结构。优秀的沉降性,良好的可重用性和稳定使用。photo-Fenton系统机制提出了F / ZA-LDH催化。工作将提供一个系统的理解高催化活性的Fe2O3 / Zn-Al层状双氢氧化物已准备使用大量废物赤泥为主要原料通过机械化学的合成。

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