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化学学报
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化学学报 ›› 2004, Vol. 62 ›› Issue (1): 16-21. 上一篇    下一篇

研究论文

层板Ni2+的引入对CuCr类水滑石晶体结构的影响研究

姜晓瑞, 李峰, Evans D.G., 段雪   

  1. 北京化工大学可控化学反应科学与技术基础教育部重点实验室, 北京, 100029
  • 投稿日期:2003-06-02 修回日期:2003-09-04 发布日期:2014-01-26
  • 通讯作者: 段雪 E-mail::E-mail:duanx@mail.buct.edu.cn
  • 基金资助:
    国家自然科学基金(No.20076003)资助项目.

Investigation of Effects of Incorporated Ni2+ on Crystal Structure of Layered Double Hydroxides Containing Cu(Ⅱ) and Cr(Ⅲ)

JIANG Xiao-Rui, LI Feng, EVANS D. G., DUAN Xue   

  1. Key Laboratory of Science and Technology of Controllable Reactions, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029
  • Received:2003-06-02 Revised:2003-09-04 Published:2014-01-26

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采用自行创制的成核晶化隔离法将Ni2+引入层状双金属复合氢氧化物(LDHs)的层板,首次合成得到了层板含Ni2+的三元金属铜镍铬的碳酸根型LDHs (CuNiCr-LDHs).通过X射线衍射(XRD)、红外光谱(FT-IR)、透射电镜(TEM)、热重及微商热重分析(TG-DTG)、等离子电感偶合元素分析(ICP)和激光粒度分析等手段对产物的晶体结构特征进行了研究,结果表明:当反应Cu2+/Ni2+/Cr3+投料摩尔比介于1:2:1～1:3:1之间,晶化温度为180℃和晶化时间大于4 h时,利用成核晶化隔离法可以合成得到晶型规整的CuNiCr-LDHs;研究同时发现,层板引入Ni2+后可以削弱Cu2+的Jahn-Teller效应对层板对称性的影响,提高了LDHs的晶型完整性和结构稳定性.

关键词: 类水滑石, 制备, 层状结构, 结构稳定性

This paper reports systematic investigation about the preparation of Cu(Ⅱ)-Ni(Ⅱ)-Cr(Ⅲ) layered double hydroxides (LDHs) with different Cu2+/Ni2+/Cr3+ ratio obtained by the new method developed in our laboratory in which nucleation and aging steps were separated. It was shown that when Cu2+/Ni2+/Cr3+ atomic ratio is between 1:2:1～1:3:1 in the reaction mixture under the hydrothermal aging conditions that aging temperature is 180℃, and aging time is above 4 h, fine crystallized LDH can be obtained. The LDHs were characterized by X-ray diffraction (XRD), FT-IR spectroscopy, chemical analysis, transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and particle size distribution analysis to describe their structure, constitution and thermal behavior. The results showed that the incorporation of Ni2+ in the layer improved the crystalline perfection and structural stability of LDH.

Key words: layered double hydroxide, preparation, layered structure, structural stability