Synthesis of a magnetic SBA-15-NH2@Dual-Template Imprinted Polymer for solid phase extraction and determination of Pb and Cd in vegetables; Box Behnken design

In this study, a simple one-step method was applied for extraction and determination of lead and cadmium. The significant variables in extraction and pre-concentration were identified using analysis of variance and their behavior was modeled. Dual-template imprinted polymer was synthesized on modified Mesoporous silica structures coated with Fe3O4 magnetic nanoparticles. The optimum condition was 6.12 for pH, 40.62 mg for the polymer amount and 17.38 for the ultrasonic time. Concentration range, correlation coefficient, limit of detection and relative standard deviation for lead were reported to be 0.5–950, 0.9988, 0.35 μg L−1 and 3.5%, respectively. For cadmium the above mentioned figure of merits were 0.3–980, 0.9969, 0.15 μg L−1 and 2.4%, respectively. The adsorption capacities for lead and cadmium were reported to be 10.28 and 10.38, while their imprinting factors were 5.89 and 6.36, respectively. [Display omitted] •A new ligand was synthesized and applied to complex with lead and cadmium.•Silicate structures can accelerate surface adsorption and facilitate analyte access to specific polymer cavities.•Dual-template imprinted polymer was synthesized on modified Mesoporous silica structures coated with Fe3O4 nanoparticles.•Significant parameters and interactions were identified and modeled using ANOVA.•The behavior of the parameters on the metals recovery was investigated using RSM.