Application of MnO<sub>2</sub> Materials to Dye Removal from Aqueous Solution by Adsorption

Abstract

The adsorption capacity was compared for the dye wastewater onto adsorbent MnO 2 . The effects of contact time and dosage of adsorbent were studied. The adsorption kinetics was analyzed. The results showed that MnO 2 possessed higher adsorption capacity to Methylene blue than Methyl orange which the removal efficiency could reached 94.82%and 78.63% respectively under the conditions (the dosage1.2g/L, time 60min, initial dye concentration 50mg/L, pH7). The dynamical data fit well with the pseudo second order kinetic model. The MnO 2 has higher Methylene blue adsorption capacity in short equilibrium times and are good alternative in wastewater treatment.