Chelating adsorption properties of PEI/SiO(2) for plumbum ion
1Department of Chemical Engineering, North University of China, Taiyuan 030051, PR China. anfuqiang@nuc.edu.cn
Abstract:
In this paper, a novel adsorption material PEI/SiO(2) with strong adsorption ability towards heavy-metal ions was prepared. In preparation of PEI/SiO(2), functional macromolecule polyethyleneimine (PEI) was grafted onto the surfaces of silica gel particles via the coupling effect of gamma-chloropropyl trimethoxysilane (CP). The adsorption properties of PEI/SiO(2) for Pb(2+) ion were studied by both static and dynamic methods. The experimental results show that PEI/SiO(2) possesses very strong adsorption ability for Pb(2+) ion, the saturated adsorption amount could reach to 17.5mgg(-1), and the empirical Langmuir isotherm was found to describe well the equilibrium adsorption data. The pH and grafting amount of PEI have great influence on the adsorption amount. The Pb(2+) ions adsorbed on PEI/SiO(2) are eluted easily by diluted hydrochloric acid solution.
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