Preparation of Pb~(2+) Double-template Imprinted Sorbent for Selective Separation of Pb~(2+) from Environmental Water and Sediment Samples
A double-template imprinted sorbent was prepared by a sol-gel imprinting approach for the selective separation of Pb2 + from environmental water and sediment samples.The adsorption property and selective recognition ability of the sorbents were studied by equilibrium-adsorption method.Results showed that in the presence of Cd2 +,the selectivity coefficient and the relative selectivity coefficient of the double-template imprinted sorbents for Pb2 + was 91 and 228,respectively,which is much higher than those of CTMAB-imp sorbents(0.4 and 9.35).The uptake capacities and the selectivity coefficients of the double-template imprinted sorbent were much higher than those of the sorbent prepared without CTMAB template.The extraction behavior of the matrix was conformed by Langmuir's equation.Theoretical sorption capacity was 0.222 mmol/g.Furthermore,the new imprinted sorbent possessed a fast kinetics for the removal of Pb2 + from aqueous solution with the saturation time less than 5 min and could be repeatedly used.This sorbent has been successfully applied to the separation and determination of the trace Pb2 + in standard reference sediment materials and real water samples.