Abstract
A new magnetic nanocomposite chitosan/EDTA/CeZnO (MEC-CeZnO) is synthesized as an efficient and eco-friendly bio-compound for the removal of chromium Cr(VI) metal ions and phenol organic matters from aqueous solutions. Nanocomposites are characterized using field emission scanning electron microscope, energy dispersive X-ray spectroscopy, transmission electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, diffuse reflection spectroscopy, and PL methods. The reduction rate of Cr(VI) ions and phenol degradation is evaluated under various experimental conditions, separately and simultaneously. The average pore diameter and specific surface of MEC-CeZnO nanocomposite are obtained 50 nm and 210 m2·g−1 respectively, which suggest the successful synthesis of the nanocomposite because of the increased surface area and reduced pores in comparison to previous studies. Moreover, the best Cr(VI) and phenol reduction efficiencies are 98% and 92% at 180 min of retention time, both following the Langmuir–Hinshelwood first-order kinetics. The mechanisms of Cr(VI) and phenol removal from aqueous solutions involved Cr(VI) reduction, phenol oxidation, and adsorption. Examining the reusability of MEC-CeZnO showed that both degradation and recovery capacity is stable in 5 cycles.
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