Based on a surface initiated graft-polymerization method

a novel surface- molecular imprinting technique is designed and founded.The coupling agent -aminopropyltrimethoxysilane (AMPS) was bond onto the surface of silica gel particles

and amino groups were introduced onto the surfaces of silica gel particles

obtaining the modified particles AMPS-SiO2.In aqueous solution

the molecules of the anionic monomer sodium styrene sulfonate (SSS) were first combined around pirimicarb molecule (a pesticide) as the template molecule by right of strong electrostatic interaction.A redox initiating system was constructed by the amino groups on AMPS-SiO2 and ammonium persulphate in the solution

and free radicals were produced on the surfaces of silica gel particles.These free radicals initiated the monomer SSS and the crosslinker N

N'-methylene bisacrylamide (MBA) to be graft-copolymerized and crosslinked

and the surface-imprinting of pirimicarb molecule was realized.After removing the template molecules

pirimicarb molecule surface-imprinted material MIP-PSSS/SiO2 was obtained.Propoxur

which is another pesticide and its chemical structure is similar to that of pirimicarb to a certain degree

was used as a contrasting substance

and both static and dynamic methods were adopted to study the molecular recognition character and the binding property of MIP-PSSS/SiO2 for pirimicarb molecule.The experiment results show that MIP-PSSS/SiO2 have specific recognition selectivity and excellent binding affinity for pirimicarb molecules

and its selectivity coefficients for pirimicarb molecules with respect of propoxur molecules is 9.373

displaying high molecular recognition selectivity and excellent combination ability for pirimicarb.