材料期刊网

以尿素为沉淀剂,M2+/M3+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.M2+和M3+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;M2+和M3+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 M2+/M3+ 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 M2+ and M3+, the composition of LDHs result in different morphologies and particle sizes.When the solubility constants of M2+ and M3+ 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 M2+ and M3+ were different, NiFe-LDHs films with spherical aggregation was observed.Compared with that of NiAl-LDHs and NiFe-LDHs films, MgAl-LDHs films showed better adsorption property.