Study of tempreture changes in hydrothermal and coprecipitation methods on properties of Ni/Al layered double hydroxides (LDH) |
Paper ID : 1407-UFGNSM-FULL |
Authors: |
Abstract: |
In this study we worked on Ni/Al nitrate layered double hydroxides. Ni/Al LDHs were prepared with Nickle(II) nitrate hexahydriate( N2NiO6.6H2O 99%) and Aluminium nitrate nonahydrate (Al(NO3)3. 9H2O 95%) with molar ratios of 2:1 and 3:1 by both coprecipitation and hydrothermal methods with nitrogen gas purged into the solutions at time ranges of 90-120°C (pH=9.5) for 24h and 180°C(pH= 6 and pH=9.5) for 24h. Samples obtained were characterized by XRD ; FT-IR and SEM. These datas show that the tempraeture increase in both methods ,enhanced the crystality and size of product and the better crystalinities were gained at hydrothermal conditions (180°C) at pH=6.00. this study offers a simple method to produce Ni/Al nitrate form LDHs under conitions of deionized water without surfactant.however when the reaction is conducted at 220°C another phase with boehemit structure emerges. At higher tempreture and in alkali conditions (pH≥10) there is possiblity to form metal oxides. |
Keywords: |
Ni/Al LDH ;Layered double hydroxide ; Coprecipitation ;Hydrothermal |
Status : Paper Accepted (Poster Presentation) |