Question

Reaction of nickel ii nitrate with oxalic acid to get nio

Answer 1

Nickel oxide nanoparticles were prepared by thermal decomposition of precursor of nickel oxalate (NiC 2 O 4 .2H 2 O) obtained via a chemical reaction between nickel nitrate hydrate (Ni(NO 3) 2 .6H 2 O) and oxalic acid (H 2 C 2 O 4. 2H 2 O) solutons. Aafter drying at 80°C for 24 hours, the precursor was decomposed in air at various temparatures to obtain nickel oxide particles. It was found that the dehydration phase of reaction was not completed. Remaining water occluded in the pores of nickel oxalate was not liberated until the decomposition of oxalate ions started. The products were characterized using X-ray diffraction, TG-DTA analysis, FESEM and TEM. The crystallit sizes of the as-calcined NiO increased with increase in temperature. FESEM images show that the as-calcined NiO at 400°C for 2 h was of narrow distribution, weak agglomeration and nanometric size. Excess concentration of oxalic acid caused achieving metallic nickel with nickel oxide and the crystallite sizes of NiO decreased with oxalic acid concentration increasing