Synthesis Study of Ethylenediamine Grafted on Silica Gel

The ethylenediamine-grafted silica gel(EDA/SiO2) was prepared by CPTCS as surface anchor and ethylenediamine as surface modification agent.The effects of temperature,time and ethylenediamine concentration on the substitution reaction of ethylenediamine with CPTCS-SiO2 were investigated in detail.And it was obtained that the optimal conditions were reaction temperature 333K,reaction time 16h,and n(ethylenediamine): n(chlorine on the surface of CPTCS-SiO2) more than 9.The substitution reaction kinetics of ethylenediamine with CPTCS-SiO2 was also investigated.It was obtained that the parameters of the apparent kinetic model were reaction order 4.37,activation energy 55.44KJ/mol and frequency factor 5.06×107h-1 by the kinetics data fitted with the differentiation and minimum variance linear regression.Infrared spectroscopy and its performance show that ethylenediamine was grafted on silica gel by substitution reaction.