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Effects of Cu2+ incorporation on ZnAl-layered double hydroxide
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020/03/02 , DOI: 10.1039/d0nj00278j Lanyan Wu 1, 2, 3, 4, 5 , Bing Peng 1, 2, 3, 4, 6 , Qingzhu Li 1, 2, 3, 4, 6 , Qingwei Wang 1, 2, 3, 4, 6 , Xu Yan 1, 2, 3, 4, 6 , Kaizhong Li 1, 2, 3, 4 , Qiuhong Lin 1, 2, 3, 4
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020/03/02 , DOI: 10.1039/d0nj00278j Lanyan Wu 1, 2, 3, 4, 5 , Bing Peng 1, 2, 3, 4, 6 , Qingzhu Li 1, 2, 3, 4, 6 , Qingwei Wang 1, 2, 3, 4, 6 , Xu Yan 1, 2, 3, 4, 6 , Kaizhong Li 1, 2, 3, 4 , Qiuhong Lin 1, 2, 3, 4
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To investigate the structural properties of Cu2+-incorporated ZnAl-layered double hydroxide, a series of CuZnAl-layered double hydroxides with various 
molar ratios was prepared by the constant pH co-precipitation method. The composition, structure and morphology of the synthesized products were analyzed by using XRD, SEM, TEM, FTIR, XPS and 27Al–1H MAS-NMR techniques. The results show that all samples with or without copper present crystalline LDH with a flower-like architecture, and no other impurity was observed. The interesting observation of the study was that the incorporation of copper influences the coordination number of aluminum. Comparing with the ZnAl-LDH layers, which contained only ZnO6 and AlO6 octahedra, in the Cu-containing LDH layers, in addition to CuO6, ZnO6, and AlO6 species, the AlO4 species is clearly observed. A simplified explanation for the formation of AlO4 species is associated with the Jahn–Teller effect of copper. These results suggest that there are structural defects (Al–O–Al connectivities) in the form of AlO4 species in the Cu-containing LDHs.
中文翻译：
铜离子的掺入对ZnAl层状双氢氧化物的影响
为了研究掺有Cu 2+的ZnAl层状双氢氧化物的结构性能，采用恒定pH共沉淀法制备了一系列摩尔比不同的CuZnAl层状双氢氧化物。使用XRD，SEM，TEM，FTIR，XPS和27 Al- 1 H MAS-NMR技术分析了合成产物的组成，结构和形态。结果表明，所有有或没有铜的样品都具有花样结构的结晶LDH，没有观察到其他杂质。这项研究有趣的发现是铜的结合会影响铝的配位数。与仅包含ZnO 6和AlO的ZnAl-LDH层相比在含铜的LDH层中的6个八面体中，除了CuO 6，ZnO 6和AlO 6种类以外，还清楚地观察到AlO 4种类。关于AlO 4物种形成的简化解释与铜的Jahn–Teller效应有关。这些结果表明，含铜的LDHs中存在AlO 4物种形式的结构缺陷（Al–O–Al连接性）。
更新日期：2020-04-06
molar ratios was prepared by the constant pH co-precipitation method. The composition, structure and morphology of the synthesized products were analyzed by using XRD, SEM, TEM, FTIR, XPS and 27Al–1H MAS-NMR techniques. The results show that all samples with or without copper present crystalline LDH with a flower-like architecture, and no other impurity was observed. The interesting observation of the study was that the incorporation of copper influences the coordination number of aluminum. Comparing with the ZnAl-LDH layers, which contained only ZnO6 and AlO6 octahedra, in the Cu-containing LDH layers, in addition to CuO6, ZnO6, and AlO6 species, the AlO4 species is clearly observed. A simplified explanation for the formation of AlO4 species is associated with the Jahn–Teller effect of copper. These results suggest that there are structural defects (Al–O–Al connectivities) in the form of AlO4 species in the Cu-containing LDHs.
中文翻译：
铜离子的掺入对ZnAl层状双氢氧化物的影响
为了研究掺有Cu 2+的ZnAl层状双氢氧化物的结构性能，
采用恒定pH共沉淀法制备了一系列摩尔比不同的CuZnAl层状双氢氧化物。使用XRD，SEM，TEM，FTIR，XPS和27 Al- 1 H MAS-NMR技术分析了合成产物的组成，结构和形态。结果表明，所有有或没有铜的样品都具有花样结构的结晶LDH，没有观察到其他杂质。这项研究有趣的发现是铜的结合会影响铝的配位数。与仅包含ZnO 6和AlO的ZnAl-LDH层相比在含铜的LDH层中的6个八面体中，除了CuO 6，ZnO 6和AlO 6种类以外，还清楚地观察到AlO 4种类。关于AlO 4物种形成的简化解释与铜的Jahn–Teller效应有关。这些结果表明，含铜的LDHs中存在AlO 4物种形式的结构缺陷（Al–O–Al连接性）。
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