Adsorption properties of nickel oxide nanoparticles for removal of Congo Red from aqueous solution

Document Type : Research Paper




The effective removal of dyes from aqueous wastewaters is among the most important issues for
many industrialized countries. Removal of Congo Red (CR) dye from aqueous solutions was studied
using nickel oxide nanoparticles. The operating variables studied were initial pH of solution,
adsorbents dosage, temperature and contact time. The morphological information of nickel oxide
nanoparticles were characterized using scanning electron microscopy (SEM) and X-ray
diffractometer (XRD). The adsorbent exhibits high efficiency for CR adsorption and equilibrium can
be achieved in 25 min. In order to investigate the efficiency of CR adsorption on nickel oxide
nanoparticles, pseudo-first-order, pseudo-second-order kinetic models were studied. It was observed
that the pseudo-second-order kinetic model fits better than other kinetic model with good correlation
coefficient. Equilibrium data were fitted to the Langmuir model.