Acta Chimica Sinica ›› 2013, Vol. 71 ›› Issue (11): 1553-1562.DOI: 10.6023/A13060634 Previous Articles    



张超a, 王幸a, 宋西亮b, 宋开慧a, 钱萍a, 尹洪宗a   

  1. a 山东农业大学化学与材料科学学院 泰安 271018;
    b 山东省临沂市益民实验中学 临沂 276025
  • 投稿日期:2013-06-17 发布日期:2013-07-24
  • 通讯作者: 钱萍, 尹洪宗;
  • 基金资助:
    项目受国家自然科学基金(No. 20903063)和山东农业大学博士后基金(No. 76335)资助.

Quantum Chemical Study of Intercalation of Hydrazine Hydrate in Kaolinite

Zhang Chaoa, Wang Xinga, Song Xiliangb, Song Kaihuia, Qian Pinga, Yin Hongzonga   

  1. a Chemistry and Material Science Faculty, Shandong Agricultural University, Tai'an 271018, Shandong Province, China;
    b Linyi Yimin Experimental Middle School, Linyi 276025, Shandong Province, China
  • Received:2013-06-17 Published:2013-07-24
  • Supported by:
    Project supported by the National Natural Science Foundation of China (No. 20903063) and the Postdoctoral Foundation of Shandong Agricultural University in China (No. 76335).

Hydrazine hydrate is now drawn more attention with its alkalinity, adsorption and pollution in clay. In this paper, the cluster model of kaolinite Al6Si6O42H42 was constructed, and the B3LYP/6-31G(d,p), MP2/6-31G(d,p)//B3LYP/ 6-31G(d,p) and MP2/6-31++G(d,p)//B3LYP/6-31G(d,p) levels were used to explore the intercalation properties (such as optimal structures, structural parameters, binding energies, charge distributions, vibration spectrum, electrostatic potential, and so on) of hydrazine monohydrate and hydrazine dihydrate in kaolinite. During the optimization, geometries of hydrazine and water molecules and only the innermost part representative of the interaction sites of kaolinite cluster model, including the oxygen atoms on the tetrahedral layer and the hydroxyls on the octahedral layer, have been fully optimized, and the "dangling" valences of the border oxygen atoms were saturated with hydrogen atoms. Results show that the interaction between hydrazine and water molecules after intercalation is different from that before intercalation, when hydrazine monohydrate is intercalated into kaolinite. That is to say, water and hydrazine interact respectively with kaolinite by forming hydrogen bonds, and the interaction between hydrazine molecule and kaolinite is stronger than that between hydrazine and water molecules, and the intercalation points are almost in the active parts of kaolinite. These are the important factors that hydrazine hydrate is easily into the kaolinite layers and difficult to take off. When hydrazine dihydrate is intercalated into kaolinite, the cluster model with different layer spacing was optimized. And the interaction between hydrazine molecule and kaolinite is stronger than that between hydrazine and water molecules with the increase of the layer spacing. When the layer spacing is greater than 1.05 nm, the interaction between hydrazine and water molecules is stronger than that between hydrazine and kaolinite, which also further confirms the feasibility of hydrazine desorption. Specifically, the layer spacing could be increased to weaken the interaction of hydrazine and kaolinite, then the solvent is used to achieve hydrazine desorption.

Key words: hydrazine hydrate, kaolinite, intercalation, hydrogen bond