反气相色谱法测定锌镁铝类水滑石的表面性能  

Surface properties of ZnMgAl hydrotalcite-like compounds by inverse gas chromatography

作　　者：周良芹[1] 付大友[1] 袁东[2] 范金龙[1] 谭文渊[1] 

机构地区：[1]四川理工学院分析测试中心,四川自贡643000 [2]四川理工学院材料与化学工程学院,四川自贡643000

出　　处：《色谱》2015年第1期96-100,共5页Chinese Journal of Chromatography

基　　金：四川省科技厅基础研究计划项目(2013JY0081);2014年度绿色催化四川省高校重点实验室项目(LYJ1405);四川理工学院2012培养项目(2012PY02)

摘　　要：采用水热合成法制备了锌镁铝类水滑石(ZnMgAl-HTLC),利用X射线衍射仪(XRD)对ZnMgAl-HTLC的晶体结构进行了表征,并以一系列非极性和极性分子为探针分子,采用反气相色谱法(IGC)研究了ZnMgAl-HTLC的表面性能。结果表明:XRD特征衍射峰窄、尖、高,水热合成法能够制得纯度较高的ZnMgAl-HTLC;ZnMgAlHTLC表面吸附自由能小于零,表面色散自由能最大为6.02 mJ/m2,酸碱作用自由能最大为5.33 kJ/mol,吸附焓为43.6 kJ/mol,吸附熵为0.15 kJ/mol。本文的反气相色谱方法对研究锌镁铝类水滑石的表面性能具有重要的指导意义。The structure of ZnMgAl hydrotalcite-like compounds（ ZnMgAl-HTLC）prepared by hydrothermal synthesis was studied by X-ray diffraction（ XRD）. With a series of polar and non-polar molecules as probes,inverse gas chromatography（ IGC）was used to measure the surface properties of ZnMgAl-HTLC. It was found that the XRD pattern of ZnMgAl-HTLC was narrow, sharp and high. The results showed that ZnMgAl-HTLC with a higher purity was obtained by hydrothermal synthesis. The surface adsorption free energy was less than zero. The surface dis-persive free energy was 6. 02mJ/m2. The acid-base interaction free energy was 5. 33 kJ/mol. The adsorption enthalpy was 43. 6 kJ/mol,and the adsorption entropy was 0. 15 kJ/mol. The IGC method is significant in the study of the surface properties of ZnMgAl-HTLC.

关 键 词：反气相色谱 锌镁铝类水滑石 表面性能 

分 类 号：O658[理学—分析化学]