Abstract

Co-precipitation approach was exploited to fabricate cerium oxide nanostructures (CeO2-NPs) and characterized according to its morphological properties through different analytical tools including X-ray diffraction (XRD), scanning electron microscope (SEM), and Fourier-transform infrared spectroscopy (FTIR). The physiochemical specifications such as zeta potential as well as pHPZC were also determined and found to be 20 mV and 5.7, respectively. The synthesized CeO2-NPs were then used to remove the sulfonated azo reactive red 198 textile dye (RR198) from water. The adsorption studies were conducted to assess the consequences of pH, CeO2-NPs dosage, interaction period, and the primary RR198 dose on removal of dye onto CeO2-NPs. Kinetic studies revealed that adsorption of dye through CeO2-NPs followed pseudo-second-order. A full factorial 4-factors at 3-levels (34) central composite experimental design (CCD) was employed to ascertain the optimal RR198 removal prerequisites, which were found to be 30 mg/L of RR198 concentration, 3 pH, 0.1 g/L of CeO2-NPs and contact period of 30 min. Following the optimized conditions, the utmost adsorptive deposition of RR198 was 66.12 mg/g. The foremost adapted isotherm for the experimental data (r2 = 0.9985, χ2 = 0.37) was SIPS among the five evaluated non-linear isotherms (Freundlich, Langmuir, Temkin, DR and SIPS). The results indicate that CeO2-NPs can be practiced for the successful elimination of azo dyes from wastewater. © 2020 Elsevier B.V.