گروه شیمی، دانشگاه پیام نور، ایران
عنوان مقاله [English]
Among the pollutants, chromium coming from industrials sewage is a severe danger to environment and living organisms. Therefore, removal of this harmful cation is very important from viewpoint of environment. In this research, nickel oxide nanoparticles with an average size of 18 nm were prepared by chemical precipitation method and after characterizing by X-ray diffraction (XRD) and scanning electron microscopy (SEM), used as the sorbent for removing of Cr(III) from aqueous solutions. Also, the influences of different factors i.e. contact time, pH, sorbent amount and initial concentration of Cr(III) on removal efficiency were investigated. Evaluation of the obtained data with Langmuir and Freundlich isotherms indicates that the adsorption process is in good accordance with Langmuir model. Under optimal conditions, the maximum adsorption capacity of nickel oxide nanoparticles was found 17.5 mg g-1.