Removal of Cu (II) from wastewater of metal coating process by borax sludge

Abstract

The aim of this study is to determine the adsorption behavior of borax sludge for removal of copper from industrialwastewater. The borax sludge was generated during borax production and used for treatment of wastewater of metalcoating process. The parameters of pH, concentration and contact time were investigated in batch experiments todetermine the efficiency of adsorption. Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES) wasused to calculate the reduced amount of Cu (II). The results were applied to various kinetic models and adsorptionisotherms. The pseudo second order model was successful to fit the adsorption process in the kinetic study becausethe regression coefficient values ($R^2$) were changed between 0.9995 and 0.9978. Langmuir ($R^2$=0.9985) and Temkin($R^2$=0.9985) isotherms models were the best to explain the process.