PEI was grafted on silica particles using γ-chloropropyl trimethoxy silane as couplant,and the composite and chelating adsorption material of PEI/SiO2 was prepared.The adsorption properties of PEI/SiO2 for Cu2+ were investigated.PEI/SiO2 possesses strong chelation adsorption ability for Cu2+,and the adsorption rate is fast.The data of isothermal adsorption matched well with Langmuir equation.As the adsorption amount increased with increasing,the chelating adsorption is likely to be an endothermic process.Th...