REMOVAL OF Cr (VI) FROM WASTE WATER USING NiO NANOPARTICLES

The synthesis of NiO nanoparticles was done by sol-gel method. Nickel Acetate Tetrahydrate ((CH3COO)2 –Ni·4H2O) was dissolved in ethanol with constant stirring to obtain a clear and light greenish sol. Oxalic acid solution was used to obtain a thick green gel, then dried in an oven to get dried gel and was then grinded into fine powders and calcined for different time periods to obtain nanocrystalline NiO. The final product obtained was fine black powder. Nanoparticle powder formed was characterized using scanning electron microscope, X-ray diffraction spectrometer and Energy Dispersive X-ray diffractometer. Parameters studied were pH, nanoparticle dosage, Chromium ion concentration and contact time. Optimization of the process was done using Response Surface Methodology and ANOVA analysis.