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化学学报
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化学学报 ›› 2003, Vol. 61 ›› Issue (1): 78-83. 上一篇    下一篇

研究论文

Cu-Ni-Mg-Al-CO3四元水滑石的合成及结构分析

冯拥军;李殿卿;李春喜;王子镐   

  1. 北京化工大学.北京(100029);北京化工大学.北京(100029可控化学反应科学 与技术基础教育部重点实验室);北京化工大学化学工程学院.北京(100029)
  • 发布日期:2003-01-15

Synthesis and Structural Analysis of Cu-Ni-Mg-Al-CO_3 Hydrotalcite- like Materials

Feng YongJun;Li DianQing;Li Chun;Wang ZiHao;Evans D G;Duan Xue   

  1. Key Laboratory of Science and Technology of Controllable Chemical Reactions, Ministry of Education, Beijing University of Chemical Technology.Beijing(100029);Chemical Enginessring Department, Beijing University of Chemical Technology.Bejing(100029);Chemical Enginessring Department, Beijing University of Chemical Technology, Bejing(100029)
  • Published:2003-01-15

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698

被引次数

70 | 16

以Cu(NO3)2·2H2O,Ni(NO3)2·6H2O,Mg(NO3)2·6H2O和Al(NO3)3·9H2O为原料 ，以NaOH和Na2CO3为沉淀剂，采用成核／晶化隔离法合成了Cu-Ni-Mg-Al-CO3四元 水滑石，通过XRD，FT－IR，TG－DTA，ICP等手段对样品进行测试和表征，并且对 水滑石结构的层板和层间阴离子相互作用进行分析和讨论。结果表明，控制Cu^2+ 离子与其它二价金属离子的配比，可制备晶体结构规整的M(Ⅱ）4M(Ⅲ)2(OH) 12CO3·4H2O型水滑石；Cu^2+离子的引入导致了明显的Jahn-Teller效应；且随 Mg^2+量的增加，使得这种效应更加显著，另一方面Mg^2+量的增加有利于Cu-Ni- Mg-Al-CO3四元水滑石晶体在a方向上生长，增强其热稳定性。

关键词: 镁, 铝, 四元系, 水滑石, 铜, 镍, 合成, 结构分析, 电感耦合等离子体光谱, Ｘ-射线衍射

Cu-Ni-Mg-Al-CO_3 hydrotalcite-like materials have been synthesized at high supersaturation using a new method developed in our laboratory by combining a mixed solution of Cu(NO_3)_2·6H_2O, Mg(NO_3)_2·6H_2O and Al(NO_3)_3·9H_2O with a second solution containing NaOH and Na_2CO_3. The materials obtained have been characterized by XRD, FT-IR, TG-DTA and ICP. The influence of different molar ratios of divalent metal ions on the crystal structure, selectivity of crystal growth in different directions and host-guest interactions in the Cu-Ni-Mg-Al- CO_3 hydrotalcite-like materials has been investigated. It is shown that Cu-Ni-Mg-Al-CO_3 hydrotalcite-like nanomaterials can be obtained using this method, and the influence of the Jahn-Teller effect on the crystal structure, thermal stability and host-guest interactions because of the presence of Cu~(2+) is quite marked. Furthermore, with increasing amounts of Mg~(2+), the thermal stabilities of Cu-Ni-Mg-Al- CO_3 hydrotalcite-like materials become better.

Key words: MAGNESIUM, ALUMINIUM, QUATERNARY, HYDROTALCITE, COPPER, NICKEL, SYNTHESIS, STRUCTURAL ANALYSIS, ICP-ATOMIC EMISSION SPECTROMETRY, X-RAY DIFFRACTION

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