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