Preparation and characterization of nickel oxide nanoparticles and its adsorption optimization for parachlorophenol

This study used the precipitation method for preparing the nickel oxide nanoparticles (NiONPs). Scanning Electron Microscopy (SEM), Infrared spectroscopy (FT-IR), X-ray Diffraction (XRD), and X-ray dispersion spectroscopy (EDS) were employed for the characterization of the microstructures morphology and particle size which is produced by this method. We calculated the N2absorptiondesorption isotherm, the pore structures, and specific NiONPsurface areas by Barrett-Joyner-Halenda (BJH) Langmuir and Brunauer-Emmett-Teller (BET) academic models. The sample showed flake fibers or sticks that set the diameter ranges (10-20) nm by SEM and XRD verifies. Therefore, the specific surface area was 98.794 m2g-1, pore volumes were 0.3105 cm3g-1, and the mean pore diameters were 1.85 nm. The study examined the impact of adsorption factors like adsorbent masses, initial concentrations, contact times, temperatures, ionic strengths, and pHs. The highest adsorbed para-chlorophenol could be adsorbent 0.05 g. The phenol adsorption increased by the rise of the initial concentrations and the system achieved an equilibrium state at 120 min. The adsorption capacity reduced when temperature decreased indicating the endothermic natures of system. The findings show that the adsorption ability of studied phenol increased when ionic strengths rose in a natural medium with the greatest values.