CHROMIUM REMOVAL FROM AQUEOUS SOLUTION USING NANOCOMPOSITE TiO2/Al2O3

Abstract

Chromium (VI) compounds are toxic-due to their oxidizing power and carcinogenic. The wide industrial use of Chromium (VI) genarates huge amounts of polluted sewage. One of Chromium (VI) removal techniques is using nanomaterials. In this study, nanocomposite TiO₂ and Al₂O₃ were synthesized by co-precipitation method and investigated for Chromium (VI) ions adsorption. The structure and properties of synthesized material (TiO₂/Al₂O₃) were characterized by Energy-Dispersive X-ray Spectroscopy (EDX), X-ray diffraction (XRD), Fourier-transformed Infrared Spectroscopy (FTIR), Dynamic light scattering (DLS) and Transmission electron microscopy (TEM) methods. The synthesized material haved a nano size. The adsorption of Chromium (VI) from aqueous solution by TiO₂/Al₂O₃ well fitted to the Langmuir isotherm model, with a maximum capacity of 15,4 mg.g^-1. The results show that TiO₂/Al₂O₃ is more efficient adsorbent for Chromium (VI) ions in compare with Al₂O₃ and TiO₂ (TiO₂/Al₂O₃ > Al₂O₃> TiO₂).