Simultaneous identification and determination of toxic metals in real samples using ion imprinted polymer based magnetic multi-walled carbon nanotube

انگليسي

In this study, ion-imprinted polymer (IIP) based magnetic multiwalled carbon nanotube [1,2] was utilized for the sensitive and selective detection of some toxic metal ions [3] simoultionusly before introduced them to Inductively coupled plasma atomic emission spectroscopy ICP-OES [4]. Suspension polymerization technique [5] was applied for the synthesis of the polymer using azobisisobutyronitrile (AIBN) as a initiator, 1,5-diphenyl carbazone as a chelating agent and methacrylic acid (MAA) and ethylene glycol dimethacryalte (EGDMA) as functional monomer and cross linker respectively. X-ray diffraction, field emission scanning electron microscopy (FE-SEM) and Fourier transform infrared spectroscopy (FT-IR) was utilized to characterize the synthesized composite. Different parameters such as extraction and desorption time, eluent type and concentration and pH was evaluated . The result demonstrated that the proposed method was acceptable for preconcentration of toxic metals and the IIP offerd imprinting properties for Cu (II), Ni (II), Pb (II), Cd (II), Zn (II) and Mn (II) with analytical recoveries close to 100% for all elements. Under optimal conditions, the method displayed a linear response and detection limit at the low amount of μg L-1 range for whole ions. Finally, the proposed analytical procedure was successfully applied to monitoring that metal ions in food and water samples with satisfactory results for the spiked samples.