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首页> 外文期刊>RSC Advances >Comparison of transition metal (Fe, Co, Ni, Cu, and Zn) containing tri-metal layered double hydroxides (LDHs) prepared by urea hydrolysis
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Comparison of transition metal (Fe, Co, Ni, Cu, and Zn) containing tri-metal layered double hydroxides (LDHs) prepared by urea hydrolysis

机译：尿素水解制备的含三金属层状双氢氧化物（LDHs）的过渡金属（Fe，Co，Ni，Cu和Zn）的比较

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This paper details a successful synthesis and comparison of a range of tri-metal hydrotalcite-like layered double hydroxides (LDHs) using urea hydrolysis. Transition-metal-substituted MgMAl-LDHs were synthesized with M = Fe, Co, Ni, Cu or Zn. 5 mol% and 10 mol% substitutions were performed, where Mg was substituted with Co, Ni, Cu and Zn, and Al with Fe. The successful synthesis of crystalline MgMAl-LDHs was confirmed using X-ray powder diffraction (XRD) analysis. Energy-dispersive X-ray (EDX) spectroscopy was used to identify substituted metals and determine changes in composition. Changes in morphology were studied using scanning electron microscopy (SEM). Thermogravimetric analysis was used to determine the effect of Fe-, Co-, Ni-, Cu- or Zn-substitution on the thermal degradation of the MgMAl-LDH phase. The structure, morphology and thermal behavior of the LDHs were shown to be influenced by the substituted transition metals. The observed thermal stability took the order MgNiAl- > MgFeAl- = MgAl- ≥ MgCoAl- > MgCuAl- > MgZnAl-LDH. The urea hydrolysis method was shown to be a simple preparation method for well-defined crystallite structures with large hexagonal platelets and good distribution of transition metal atoms in the substituted LDHs.
机译：本文详细介绍了使用尿素水解法成功合成和比较了一系列类似三金属水滑石的层状双氢氧化物（LDH）。合成了过渡金属取代的MgMAl-LDHs，其中M = Fe，Co，Ni，Cu或Zn。进行5mol％和10mol％的取代，其中Mg被Co，Ni，Cu和Zn取代，而Al被Fe取代。使用X射线粉末衍射（XRD）分析确认了晶体MgMAl-LDHs的成功合成。能量色散X射线（EDX）光谱用于鉴定取代的金属并确定组成的变化。使用扫描电子显微镜（SEM）研究了形态变化。使用热重分析法确定Fe，Co，Ni，Cu或Zn取代对MgMAl-LDH相热降解的影响。 LDHs的结构，形态和热行为受取代的过渡金属影响。观察到的热稳定性按照MgNiAl-> MgFeAl- = MgAl-≥MgCoAl-> MgCuAl-> MgZnAl-LDH的顺序排列。尿素水解法被证明是一种简单的制备方法，用于定义明确的微晶结构，该微晶结构具有大的六边形薄片，并且在取代的LDH中具有良好的过渡金属原子分布。

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