Fe3O4@MCM-41-(SO3−)[ZrO2] Magnetic Mesoporous Nanocomposite: Dispersive Solid-Liquid Micro Extraction of Pb2+ Ions

Abstract

In the present study, Fe3O4@MCM-41-(SO3−)[ZrO2] magnetic nano-particles (MNPs) as a new, effective and selective solid phase is reported for the preconcentration of lead ions by using of dispersive solid-liquid micro extraction (DSLME) as a rapid method. The Fe3O4@MCM-41 nanocomposite with charged sulfonate groups can be synthesized by the formation of sulfonic functionalized organic-inorganic MCM-41 mesoporous structure on the surface of magnetite nanoparticles. The encapsulated ZrO2 nanoparticles into network of Fe3O4@MCM-41─SO3H MNPs fabricated by covalently bound with implanted of charged sulfonate groups (-SO3−). The structure and morphology of the prepared sorbent were characterized by FT-IR, XRD, VSM, BET and TEM techniques in order to show that they comprised of both magnetite silica mesoporous structures with incorporated sulfonate groups and encapsulated ZrO2 nanoparticles. The synthesized solid phase was utilized for the preconcentration of lead ions prior to determination by atomic absorption spectrophotometry. The calibration graph was obtained under the optimized conditions with linear dynamic range of 1.0–300 μg L−1 and correlation coefficient (r2) of 0.998. The detection limits of this method was 0.03 ng mL−1. The obtained results showed that, the method can be successfully applied to the selective extraction and determination of the lead ionsin different samples of water.