水合肼在高岭石层间插层行为的量子化学研究  

Quantum Chemical Study of Intercalation of Hydrazine Hydrate in Kaolinite

作　　者：张超[1] 王幸[1] 宋西亮 宋开慧[1] 钱萍[1] 尹洪宗[1] 

机构地区：[1]山东农业大学化学与材料科学学院,泰安271018 [2]山东省临沂市益民实验中学,临沂276025

出　　处：《化学学报》2013年第11期1553-1562,共10页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20903063);山东农业大学博士后基金(No.76335)资助~~

摘　　要：水合肼以其碱性及吸附性受到越来越多的关注,同时它在粘土中的污染问题也越来越受到重视.本工作构建了高岭石团簇模型为Al6Si6O42H42并在B3LYP/6-31G(d,p),MP2/6-31G(d,p)//B3LYP/6-31G(d,p)和MP2/6-31++G(d,p)//B3LYP/6-31G(d,p)水平下对一水合肼以及二水合肼在高岭石层间的插层性质(如:优化构型、结构参数、结合能、电荷分布、振动光谱、静电势等)进行探究.计算表明,当一水合肼进入层间后,水分子和肼分子之间的相互作用发生了改变.即水与肼分子分别以氢键的形式插层于高岭石层间,且肼与高岭石之间的相互作用要强于肼与水之间的相互作用,同时插层位点多位于高岭石四面体层和八面体层的重叠区域内,这些都是水合肼易进入高岭石层间而难以脱去的重要因素.当二水合肼进入层间后,随着层间距的不断扩大,肼分子与高岭石铝氧层之间的相互作用仍强于肼分子与水分子间的作用.但当层间距超过1.05 nm时,水分子与肼分子之间的作用则强于肼分子与高岭石的作用,这也印证了若要将肼脱附,需将层间距增大以减弱肼分子与高岭石的作用,再用溶剂将其脱附的可行性.Hydrazine hydrate is now drawn more attention with its alkalinity, adsorption and pollution in clay. In this paper, the cluster model of kaolinite A16Si6042H42 was constructed, and the B3LYP/6-31G（d,p）, MP2/6-31G（d,p）//B3LYP/ 6-31G（d,p） and MP2/6-31 d-＋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 m61ecules 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 0n the octahedral layer, have been fully optimized, and the ＂dan- gling＂ 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 o

关 键 词：水合肼 高岭石 插层 氢键 

分 类 号：O611.3[理学—无机化学]