Removol of C. I. Reactive Red 2 from aquous solutions using Mg-Fe layered double hydroxide

The ability of Mg-Fe layered double hydroxide to remove C. I. Reactive Red 2 from aqueous solution was investigated. The influence of molar ratio of Mg-Fe, solution pH, contact time and initial dye concentration on adsorption capacity of C. I. Reactive Red 2 was studied. Batch isotherm studies were carried out on a laboratory scale to evaluate the adsorption capacity of Mg-Fe layered double hydroxide. The maximum dye removal was observed at Mg-Fe molar ratio of 4. Solution pH ranging from 2-8 had little effect on adsorption rate. The Langmuir and Freundlich isotherm models were used for modeling the adsorption equilibrium. It was obtained that the adsorption equilibrium data were fitted very well to the Langmuir as well as to the Freundlich adsorption model. The maximum dye uptake obtained from the Langmuir model at temperature of 30°C was 161.29 mg/g (R²=0.9965). The results indicate that Mg-Fe layered double hydroxide is a promising sorbent for dye removal from wastewater.