Preparation and Characterization of a Nanoparticles Modified Chitosan Sensor and Its Application for the Determination of Heavy Metals from Different Aqueous Media

摘要

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