Synthesis, characterization and study of thermal changes of Ni/Felayered double hydroxides prepared by coprecipitation and hydrothermal methods

In this article we studied synthesis, characteristic and thermal properties of Ni/FeLDHs by both thermal and hydrothermal coprecipitation methods by nickle(II) nitrate hexahydriate(Ni(NO3)2.6H2O 99%) and iron(III) nitrate nonahydrate (Fe(NO3)3.9H2O 95%) with molar ratios of 2:1 and 3:1 at the temperature range of 150°C (pH=10 for 24h and 48h)and 90,120 (at pH=10), 180 °C (pH=10 and pH=6.5) for 24h and purged with nitrogen gas. Samples obtained were characterized by XRD; FT-IR and SEM. These datas show that the better crystalinities were gained at hydrothermal at alkali conditions and at lower tempretures no good structure is obtained. At higher tempreture and in alkali conditions (pH> 10) there is possiblity to form metal oxides. This study offers a simple method to produce Ni/Fe nitrate LDHs under conitions of deionized water without surfactant.

Keywords:

Ni/Fe LDH Layered double hydroxide , Coprecipitation , Hydrothermal