Synthesis of Nickel Nanoparticles and Application in Malachite Green Dye Colour Removal using Adsorption

Nickel nanoparticles were synthesized by chemical reduction method using hydrazine hydrate as a reducing agent, Sodium hydroxide to speed up the reaction, Nickel chloride as precursor and Polyvinyl pyrrolidone (PVP) as stabilizing agent. The experiments were carried out in a batch process at a temperature 50oC to 60oC. During the process pH was maintained at 12.5. Characterization of Nickel nanoparticles were carried out using UV-Vis spectrophotometer, FT-IR, SEM, XRD and DLS. Nanoparticles were synthesized using PVP and without PVP. Studies showed that addition of PVP reduced the size of the nanoparticles from 13.46 nm for nickel nanoparticles and 11.06 nm for Ni-PVP nanoparticles. The synthesized nickel nanoparticles were used in the application of dye color removal using adsorption technique. It was observed that 92.8% of color was removed with adsorption. Adsorption kinetic studies and adsorption isotherms were fitted to the models. The adsorption kinetics follows pseudo second-order model and the adsorption isotherm best fits by Langmuir isotherm model.