Nanosized Fe3O4–curcumin conjugates for adsorption of heavy metals from seawater samples
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Magnetic nanoparticles (MNPS) functionalized by curcumin (Cur) was synthesized with a simple co-precipitation method and used for removal of Cu(ІІ), Cd(ІІ) and Co(ІІ) in natural water samples. The Cur-coated MNPS were characterized by XRD, EDX, FT-IR, FE-SEM and TEM techniques. TEM result showed the particle size of < 20 nm for the synthesized material. The optimum extraction conditions were obtained as sample pH in the range of 6.5–7.5 and the sorbent mass of about 6 mg for the metals. The fast extraction times (≤ 3 min) were obtained for sorption of Cu (II), Cd(ІІ) and Co(ІІ). The complete elution from the sorbent surface was carried out using 0.5 mL HNO3 solution (0.1 mol L−1). The detection limit of the method was found to be lower than 0.5 ng L−1 for the analytes. The analytical curve was linear from 0.4 to 70 µg L−1 for Cu(ІІ) and Cd(ІІ), and 1.5–50 µg L−1 for Co(ІІ) with an correlation coefficients of > 0.991 and a relative standard deviation of 1.3% (n = 6).
KeywordsHeavy metals Curcumin Magnetic extraction Nanocomposite Removal