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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Amine-Assisted Syntheses of Carbonate-Free and Highly Crystalline Nitrate-Containing Zn-Al Layered Double Hydroxides
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Amine-Assisted Syntheses of Carbonate-Free and Highly Crystalline Nitrate-Containing Zn-Al Layered Double Hydroxides

机译：不含碳酸盐和高度结晶硝酸盐的Zn-Al层状双氢氧化物的胺辅助合成

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摘要

Zn-Al layered double hydroxides (LDHs), with nitrate as the charge balancing anion in the interlayer space, were synthesized by precipitation from homogeneous solution containing different amines [e.g., hexamethylenetetraamine (HMTA), diethylenediamine (DEDA), trimethylamine (TMA) and dimethylamine (DMA)]. The applied method does not require nitrogen atmosphere. The solution pH and concentration of different amines were varied in order to identify the controlling parameters and whether nitrate or carbonate are the interlayer anion. Particularly, the addition of amines turns out to be an effective tool for the synthesis of nitrate containing Zn-Al LDHs independent from the nitrogen atmosphere. The structure, textural, composition, and morphological properties were investigated using the powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), FT-IR spectroscopy, and scanning electron microscopy (SEM). The analyses showed that the samples had high crystallinity and purity. The NO_3-ZnAl LDHs samples show that LDH sheets are predominantly smooth textured and the thickness of LDH sheets are found to be around 23 nm. The results also indicate that this method successfully produces a NO_3~– form Zn-Al LDH that is almost identical to the one synthesized by conventional methods.
机译：通过从含有不同胺（例如六亚甲基四胺（HMTA），二亚乙基二胺（DEDA），三甲胺（TMA）和四氢呋喃）的均相溶液中沉淀，合成了具有硝酸盐作为层间空间中的电荷平衡阴离子的锌铝层状双氢氧化物（LDHs）二甲胺（DMA）]。所应用的方法不需要氮气氛。改变溶液的pH值和不同胺的浓度，以便确定控制参数以及硝酸根或碳酸根是层间阴离子。特别地，胺的添加被证明是用于合成独立于氮气氛的含硝酸盐的Zn-Al LDH的有效工具。使用粉末X射线衍射（PXRD），热重分析（TGA），傅立叶变换红外（FT-IR）光谱和扫描电子显微镜（SEM）研究了结构，结构，组成和形态特性。分析表明样品具有高结晶度和纯度。 NO_3-ZnAl LDHs样品显示LDH片主要是光滑的纹理，发现LDH片的厚度约为23 nm。结果还表明，该方法成功产生了NO_3〜-形式的Zn-Al LDH，几乎与常规方法合成的相同。

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