Palm shell activated carbon was modified via surface impregnation with polyethyleneimine (PEI) to enhance removal of Cu2 + from aqueous solution in this study. The effect of PEI modification on batch adsorption of Cu2 + as well as the equilibrium behavior of adsorption of metal ions on activated carbon were investigated. PEI modification clearly increased the Cu2 + adsorption capacities by 68% and 75.86% for initial solution pH of 3 and 5 respectively. The adsorption data of Cu2 + on both virgin and PEI-modified AC for both initial solution pH of 3 and 5 fitted the Langmuir and Redlich–Peterson isotherms considerably better than the Freundlich isotherm.
Yin, C-Y., Aroua, M. K., & Daud, W. M. A. W. (2007). Modification of granular activated carbon using low molecular weight polymer for enhanced removal of Cu2 + from aqueous solution. Water Science and Technology, 56(9), 95-101. https://doi.org/10.2166/wst.2007.682