A biosensor electrode based on the incorporation of super nanoparticles paramagnetic iron oxide (α-Fe3O4) in chitosan (CS) film coated on platinum electrode, was developed for the determination and removal of heavy metals. The morphological properties of the homogenous α-Fe3O4/CS nanocomposite were studied with scanning electron microscopy (SEM), Energy Dispersive X-ray analysis (EDX), and thermal gravimetric analysis (TGA). The morphological results indicate the successful formation of α-Fe3O4/CS nanocomposite and high stability of the film. The α-Fe3O4/CS nanocomposite showed a great efficiency for the determination of As, Pb, and Ni ions from aqueous solution using various electrochemical techniques. The presence of α-Fe3O4 nanoparticles results in increased active surface area and enhanced electron transfer. Results showed that this novel α-Fe3O4/CS nanocomposite was successfully applied for sewage water and human urine samples with very low detection limit.
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Ahmed et al. (2013) studied this question.
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