Green Synthesis of Nickle Oxide Nanoparticles for Adsorption of Dyes

The green synthesis of nickel oxide nanoparticles (MO-NP) was investigated using Ni(NO3)(2) as a precursor, olive tree leaves as a reducing agent, and D-sorbitol as a capping agent. The structural, optical, and morphology of the synthesized NiO-NP have been characterized using ultraviolet-visible spectroscopy (UV-Vis), X-ray aystallography (XRD) pattern, Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM) analysis. The SEW analysis showed that the nanoparticles have a spherical shape and highly crystalline as well as highly agglomerated and appear as cluster of nanoparticles with a size range of (30 to 65 nm). The Scherrer relation has been used to estimate the crystallite size of NiO-NP which has been found about 42 nm. The NiO-NPs have subsequently used as adsorbents for adsorption of two types of dyes; methylene blue (AB) as cation dye and methyl orange (MO) as anion dye. The removal efficiency ofdyesfrom contaminated water was investigated during various key parameters at room temperature; initial dye concentration (Co), pH, contact time (t), agitation speed, and adsorbent dosage. The maximum removal of MB dye was found to be 96% (Co=25 mg/l, pH=10, contact time=100 min, agitation speed=300 rpm and adsorbent dosage=6 g/l), while for MO the maximum removal reached 88% at (Co=20 mg/L, pH=2, t=160 min, agitation speed=300 rpm and adsorbent dosage=6 g/L). The experimental adsorption data were found to well obey Freundlich isotherm. The kinetic investigation showed that the adsorption process for both dyes followed a pseudo-second-order model with rate constants 0.0109 and 0.0079 (mg/g min) for MB and MO, respectively.

Automated summary

In this study, green synthesis of nickel oxide nanoparticles was investigated using various agents and the nanoparticles were characterized for their structural and morphological properties. The synthesized nanoparticles showed high crystallinity and agglomeration, and they were able to effectively remove dye pollutants.