Abstract:

A novel magnetic nano-adsorbent was prepared by covalent binding of high-deacetylated-degree carboxymethylated chitosan onto the surface of magnetic Fe₃O₄ nanoparticles，which were fabricated by a chemical coprecipitation method. The adsorbent was characterized by transmission electron microscopy（TEM），Fourier transform infrared spectroscopy（FT-IR），X-ray diffraction patterns（XRD），and vibrating sample magnetometer（VSM）. Moreover，the adsorption property of the magnetic nano-adsorbent for Cu(Ⅱ) ions was also investigated. The results showed that the adsorption capability was significantly affected by pH，and the adsorption capacity was the best at pH=5. The adsorption data obeyed the Langmuir equation with a maximum adsorption capacity of 71.43 mg/g and a Langmuir adsorption equilibrium constant of 0.0543 L/mg.