Removal of Direct Red ۲۳ Dye Using CeO۲/NiO/NiAl۲O۴ Nanocomposite: Mechanism, Kinetic, Thermodynamic, and Equilibrium Studies

We designed a facial and novel CeO۲/NiO/NiAl۲O۴ nanocomposite prepared by recalcination of the cerium impregnated product of the primary calcined production of NiAl-NO۳ layered double hydroxide (LDH) through the structural memory effect. The materialization of as-prepared nanocomposite was confirmed by Fourier-transform infrared (FT-IR) spectroscopy, powder X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal gravimetry (TG), dynamic light scattering (DLS) and transmission electron microscopy (TEM). Morphologic studies revealed that the size of the nanocomposite was below ۱۰۰ nm. The resulting mixed metal oxide nanocomposite was employed as an efficient adsorbent for the removal of Direct Red ۲۳ (DR۲۳) as a model pollutant from textile wastewater. The dye removal study showed >۹۸% efficiency for the removal of dye which revealed the superiority of material for decontamination of waste water, while the maximum adsorption capacity determined from isotherm data was ۵۸۸.۲۴ mg of dye per g of the adsorbent. In addition, the reusability was also performed up to three cycles with ۸۹, ۸۵ and ۸۸% efficiency for DR۲۳. Also, thermodynamics, isotherm and kinetic studies were investigated. Overall, we offer a facile method for synthesizing CeO۲/NiO/NiAl۲O۴ nanocomposite, efficiently decontaminating DR۲۳ from water with good recyclability.

Keywords:

CeO۲/NiO/NiAl۲O۴ nanocomposite , Dye removal , Isotherm studies , Water safety