Study of the adsorption of methyl orange from aqueous solution using nickel oxide nanoparticles: Equilibrium and Kinetics Studies

Abstract

Methyl orange is one dye resulted from the textile industry. The aim of this study is to test the<br />adsorption capacity of nickel oxide nanoparticles for removing the methyl orange from aqueous<br />solution. The parameters studied were the effect of temperature, contact time and initial pH of<br />solution. Results indicate that the removal efficiency of nickel oxide nanoparticles increases with<br />increasing concentration of methyl orange and temperature. Adsorption isotherms were investigated<br />to complete understanding the adsorption processes. The adsorption behavior was analyzed by<br />Langmuir, Freundlich and Tempkin isotherms. The values of correlation coefficients (R2) showed<br />that the Langmuir isotherm model has a better fitting than Freundlich and Tempkin isotherms.<br />Sorption kinetic data were fitted to the pseudo second-order model.