Abstract
Functional macromolecule polyethyleneimine (PEI) is grafted onto the surface of silica gel particles with the “graft to” method using γ-chloropropyl trimethoxy silane as coupling agent, and the grafted composite adsorption material PEI/SiO2 is prepared. The adsorption abilities and mechanism of PEI/SiO2 towards p-nitrophenol are also studied. The results show that PEI/SiO2 possesses very strong adsorption ability for p-nitrophenol by hydrogen bond interaction. The adsorption amount can reach to 78.6mg•g−1. The adsorption is physical adsorption of a monomolecular layer and conforms to the Freundlich adsorption model. The pH and temperature have great influence on the adsorption capacity. As sodium hydroxide solution is used as eluent, and the adsorbed phenol is eluted easily from PEI/SiO2.
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