反相气相色谱法探究铜镁铝水滑石的表面性质  

Surface Characterization of Copper-Aluminum-Magnesium Hydrotalcites Investigated by Inverse Gas Chromatography

作　　者：付晓微[1] 倪哲明[1] 刘娇[1] 

机构地区：[1]浙江工业大学化学工程与材料学院,杭州310032

出　　处：《化学学报》2012年第8期968-972,共5页Acta Chimica Sinica

摘　　要：采用共沉淀法合成了CuxMg3-xAl-LDHs(x=0～3),利用FTIR及IGC法(反相气相色谱法)对合成的样品进行测试和表征,并结合计算机模拟的结果来探讨铜镁铝水滑石的表面性质.结果表明,随Cu2+含量的增加,铜镁铝水滑石表面吸附自由能及表面能色散组分增加,稳定性下降,这可能由于Cu2+本身具有的Jahn-Teller畸变会很大程度地影响层板的稳定性,导致含铜水滑石体系的稳定性降低;随着Cu2+含量的增加,水滑石表面碱性先减小后增大.CuxMg3-xAl-LDHs have been synthesized by coprecipitation,then characterized by FTIR and inverse gas chromatography（IGC）.Surface characterization of CuMgAl hydrotalcites has been investigated,link up with outcome of computer simulation.With increasing amounts of Cu2＋,surface free energy and the dispersive component of the surface energy increase,then the chemical stability of the system become worse,this may attribute to Jahn-Teller distortion of Cu2＋ which affect stability of brucite-like layers,to a large extent;the alkalescence of hydrotalcites decrease originally,then increase with increasing amounts of Cu2＋.

关 键 词：反相气相色谱法 铜镁铝水滑石 表面性质 

分 类 号：TQ424.21[化学工程] O657.72[理学—分析化学]