مشخصات پژوهش

In this research, aluminium doped ZnO@Fe3O4 nanoparticles were synthesized by a simple co-precipitation method with controlled pH. The size, morphology and surface coating of the obtained material were characterized by powder X-ray diffraction, scanning electron microscopy and Fourier transform infrared spectroscopy. The feasibility of using aluminium doped ZnO@Fe3O4 as a magnetic solid phase extraction sorbent was explored for the separation of Cd(II) ions from aqueous solutions. The important parameters influencing the removal efficiency were studied and optimized. To study of the removal efficiency, the extracted Cd(II) ions were eluted and determined by flame atomic absorption spectrometric detection. Under the optimum removal conditions (mass of nano-sorbent; 200 mg, pH 7.0, sample solution; 100 mL and eluent; 2.0 mL of 2.0 mol L–1 acetic acid), a linear range between 0.1 and 60 ng mL−1 (R2= 0.9866) with detection limit of 0.02 ng mL−1 for Cd(II) ions were observed. The accuracy of the method was confirmed by analyzing a standard reference material (NIST SRM 1643e). The method was applied for the determination of Cd(II) ions in natural waters.