title: Chelating adsorption properties of PEI/SiO(2) for plumbum ion.
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.
authors.affiliation: Department of Chemical Engineering, North University of China, Taiyuan 030051, PR China. anfuqiang@nuc.edu.cn
authors.forename: Fuqiang
authors.initials: F
authors.lastname: An
authors.forename: Baojiao
authors.initials: B
authors.lastname: Gao
mesh_terms: D000327:Adsorption; D002614:Chelating Agents / Q000737:chemistry*; D005782:Gels; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000737:chemistry*; D011094:Polyethyleneimine / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet
chemical_list: D002614:Chelating Agents; D005782:Gels; D007854:Lead; D012822:Silicon Dioxide; D011094:Polyethyleneimine