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首页> 外文期刊>CERAMICS INTERNATIONAL >Facile synthesis of morphology and size-controlled alpha-Fe2O3 and Fe3O4 nano-and microstructures by hydrothermal/solvothermal process: The roles of reaction medium and urea dose
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Facile synthesis of morphology and size-controlled alpha-Fe2O3 and Fe3O4 nano-and microstructures by hydrothermal/solvothermal process: The roles of reaction medium and urea dose

机译：水热/溶剂热法容易地合成形貌和尺寸受控的α-Fe2O3和Fe3O4纳米及微观结构：反应介质和尿素用量的作用

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This paper reports a systematic study of the influences on the synthesis of alpha-Fe2O3 and Fe3O4 via a hydro/solvothermal process at 200 degrees C. Both the reaction medium and urea dose have been investigated. The products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM). Results showed that the reaction mediums, such as water and ethylene glycol, played important roles in forming different types of iron oxides. Pure crystalline alpha-Fe2O3 was formed via the hydrothermal process, and Fe3O4 was obtained through a solvothermal route with ethylene glycol as reaction medium. Increasing urea dose tuned the particle sizes of alpha-Fe2O3 and Fe3O4 from a few hundreds to several tens of nanometers. With addition of urea, the morphology of alpha-Fe2O3 evolved from olive-like to rhomb-like, and Fe304 evolved from hollow sphere, to pinecone-like, and finally into cracked nanostructures. The variations of the surface area of products were mainly dependent on the microstructure and intrinsic features of the iron oxide particles. Results of the mechanistic studies indicated that the generation of CO2 and NH3 via in situ thermal decomposition of urea was crucial for the formation of alpha-Fe2O3 and Fe3O4 nano-and microstructures. The as-synthesized alpha-Fe2O3 and Fe3O4 were used as catalysts for methylene blue degradation in the presence of H2O2, and alpha-Fe2O3 showed a higher degradation efficiency. Our findings demonstrated a promising strategy for the developments of rationally designed iron oxides. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
机译：本文报道了在200℃通过水/溶剂热过程对α-Fe2O3和Fe3O4合成的影响的系统研究。已经研究了反应介质和尿素剂量。通过X射线衍射（XRD），傅立叶变换红外光谱（FT-IR），扫描电子显微镜（SEM），透射电子显微镜（TEM）表征产物。结果表明，水和乙二醇等反应介质在形成不同类型的氧化铁中起着重要作用。通过水热法形成纯结晶的α-Fe2O3，并以乙二醇为反应介质，通过溶剂热法得到Fe3O4。尿素剂量的增加将α-Fe2O3和Fe3O4的粒径从数百纳米调整到几十纳米。加入尿素后，α-Fe2O3的形态从橄榄状演变为菱形，Fe304从中空球状演变为松果状，最后发展为破裂的纳米结构。产品表面积的变化主要取决于氧化铁颗粒的微观结构和内在特征。机理研究的结果表明，尿素的原位热分解产生的CO2和NH3对于形成α-Fe2O3和Fe3O4纳米和微观结构至关重要。合成后的α-Fe2O3和Fe3O4用作在H2O2存在下亚甲基蓝降解的催化剂，而α-Fe2O3显示出更高的降解效率。我们的发现证明了合理设计氧化铁发展的一种有前途的策略。 （C）2016 Elsevier Ltd和Techna Group S.r.l.版权所有。

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