Adsorption of erythrosine and carmosine red dyes from aqueous solutions with nano copper oxide adsorbent: kinetic and thermodynamic study

In this study, copper oxide has been successfully used as a good and inexpensive adsorbent to remove erythrosine and carmosine red dyes from several aqueous solutions. The effect of various parameters such as pH, dye concentration, adsorbent amount, contact time and temperature on the removal process was investigated. The isothermal adsorption data can be interpreted with the Langmuir and Freundlich isotherm models. Values higher than 43.103 K and 10.162 mg / L for erythrosine and red carmosine indicate that copper oxide has a greater affinity for dyes than other adsorbents