不同组成LDHs薄膜的制备及吸附性能研究  

Preparation of LDHs Thin Films with Different Compositions and Its Adsorption Properties

作　　者：于欢[1] 王卫伟[1] 

机构地区：[1]山东理工大学材料科学与工程学院,淄博255091

出　　处：《硅酸盐通报》2017年第3期1075-1079,1084,共6页Bulletin of the Chinese Ceramic Society

基　　金：山东省自然科学基金资助项目(ZR2015BM022)

摘　　要：以尿素为沉淀剂,M^(2+)/M^(3+)摩尔比为2/1,采用水热法在导电布上制备了三种层状双金属氢氧化物(LDHs)薄膜,并采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱分析(EDS)、傅里叶变换红外光谱(FT-IR)等手段进行表征。研究结果表明:组成LDHs薄膜的二价金属离子和三价金属离子溶度积之间的差异决定了LDHs薄膜的形貌和粒径。M^(2+)和M^(3+)溶度积相差较小时,NiAl-LDHs和MgAl-LDHs薄膜为片状结构,其中MgAl-LDHs片以ab面垂直导电布生长;M^(2+)和M^(3+)溶度积相差较大的NiFe-LDHs薄膜则由球形团聚构成。甲基橙吸附实验表明,形貌良好、孔隙较多的MgAl-LDHs薄膜具有良好的吸附性能。Three kinds of LDHs thin films were prepared by hydrothermal method with molar ratio of M^2＋/M^3＋being 2/1 and urea as the precipitant. The structure,size and morphology of LDHs thin films were characterized by X-ray diffraction（ XRD）,Scanning Electronic Microscopy（ SEM）,energy-dispersive spectroscopy（ EDS） and Fourier transform infrared spectroscopy（ FT-IR）. Experimental results show that the different solubility constants（ Ksp） between M^2＋and M^3＋,the composition of LDHs result in different morphologies and particle sizes. When the solubility constants of M^2＋ and M^3＋ were similar,NiAl-LDHs and MgAl-LDHs films have platelet-like shape. The ab plane of MgAl-LDHs sheets grew perpendicular to the surface of conductive fabric substrate. When the solubility constant of M^2＋and M^3＋ were different,NiFe-LDHs films with spherical aggregation was observed. Compared with that of NiAl-LDHs and NiFeLDHs films,MgAl-LDHs films showed better adsorption property.

关 键 词：LDHS 薄膜 金属离子种类 吸附性能 

分 类 号：O611[理学—无机化学] O614[理学—化学]