Saber Osama
Egyptian Petroleum Research Institute, El-Zohour District, Nasr City, PO Box 11727, Cairo, Egypt.
J Colloid Interface Sci. 2006 May 1;297(1):182-9. doi: 10.1016/j.jcis.2005.10.010. Epub 2005 Dec 15.
The layered double hydroxides (LDHs) are nano-ordered layered compounds and well known for their ability to intercalate anionic compounds. Most LDH is prepared conventionally only with divalent and trivalent cations. In this study, Co-Zr-Si LDH, consisting of divalent, tetravalent, and tetravalent cations, was prepared and reacted with monocarboxylic acids at room temperature. The Co-Zr-Si LDH and intercalated compounds have been characterized by energy-dispersive X-ray spectrometry, X-ray powder diffraction, IR spectra, thermal analysis, and scanning electron microscopy (SEM). The insertion of cyanate and carbonate anions into LDH was confirmed by IR spectra. XRD patterns of the prepared Co-Zr-Si LDH showed that the interlayer spacing of the LDH is 0.78 nm. The spacing is similar to that of usual LDH in which chloride, carbonate, or bromide anion is the guest. SEM images showed that Co-Zr-Si LDH can exist as plate-like or fibrous structures.
层状双氢氧化物（LDHs）是纳米级有序层状化合物，以其插入阴离子化合物的能力而闻名。大多数LDH传统上仅用二价和三价阳离子制备。在本研究中，制备了由二价、四价和四价阳离子组成的Co-Zr-Si LDH，并在室温下与一元羧酸反应。通过能量色散X射线光谱、X射线粉末衍射、红外光谱、热分析和扫描电子显微镜（SEM）对Co-Zr-Si LDH和插层化合物进行了表征。红外光谱证实了氰酸根和碳酸根阴离子插入到LDH中。制备的Co-Zr-Si LDH的XRD图谱表明，LDH的层间距为0.78nm。该间距与以氯、碳酸或溴阴离子为客体的普通LDH的间距相似。SEM图像显示，Co-Zr-Si LDH可以以板状或纤维状结构存在。
