nickel oxide nanoparticles application as an efficient adsorbent for dye removal from synthetic wastewater treatment

background: in this study, adsorbentn process performance was assessed using nickel oxide nanoparticles for wastewater treatment containing mono azo orange ii dye in a laboratory scale. methods: the effects of various factors such as adsorbent dosage, contact time, ph and initial dye concentration were investigated. findings: based on the obtained results, the optimum ph range to dye removal is acidic ph and under these conditions, complete removal of the 50 mg/l dye can be achieved by using 0.6 g/l of nickel oxide.  this concentration of nickel oxide was determined as the optimum concentration. although increasing dye concentration caused a decrease in the efficiency process, but a considerable efficiency was obtained in 100 mg/l dye concentration. conclusion: the data showed that the nickel oxide nanoparticles could be used as an efficient adsorbent for the decolorization of azo dyes.