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Abstract

The aim of the work was to prepare Ni(II)-Ti(IV) layered double hydroxides using coprecipitation at high supersaturation method, which has not been reported yet. The samples were prepared using coprecipitation at high supersaturation, by adding mixed salt (Ni2++Ti4+) solution to NaOH+Na2CO3 solution. The prepared samples were characterized using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Thermogravimetric analysis(TG) and Differential Scanning Calorimetry. The results of XRD analysis has confirmed that prepared samples have hydrotalcite-like structure, isomorphous to a-Ni(OH)2. Separate titanium oxide or hydroxide phase was not observed. The influence of synthesis temperature and hydrothermal treatment on phase composition, morphology, and thermal stability has been studied using TG, DSC, and SEM. It has been established that elevated synthesis temperature and hydrothermal affect crystallinity, thermal stability and morphology, but no effect on phase composition was observed. A formation mechanism of Ni(II)-Ti(IV) layered double hydroxide during coprecipitation at high supersaturation have been proposed.