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Abstract
Activated carbon (AC) prepared from peanut shell (PS) with microwave treatment was used to remove indigo carmine (IC) from aqueous solution in this study. PS and AC were examined by pore structural analysis, scanning electron microscopy, and elemental analysis. Effect of initial dye concentration, contact time, pH, and temperature on IC removal was investigated by batch experiments. The adsorption capacity increased with the increase of initial concentration, and decreased with increasing pH. Higher temperatures were favorable for the adsorption. The adsorption equilibrium could be reached within 90 min for all studied concentrations. The results showed that the Langmuir isotherm model had a good fit for the equilibrium data. Kinetic studies revealed that the adsorption followed the pseudo-second-order kinetic model. Thermodynamic studies indicated that the adsorption was a spontaneous, endothermic process.
Acknowledgments
The authors are grateful for the financial support by the Nature Science Foundation of Hebei Province (No. B2012408006), the Nature Science Foundation of Langfang Teachers’ college (No. LSZZ201304).