Evaluation of Adsorptive Efficiency of Calcium Oxide Nanoparticles for the Elimination of Cationic Dyes: Combustion Synthesis, Adsorption Study and Numerical Modeling

The adsorption characteristics of Basic Red 46 (BR46) were evaluated onto calcium oxide nanoparticles synthesized in two different procedure by combustion method. The operational parameters was checked out to achieve the optimum condition. The X-ray diffraction spectrum, FTIR and scanning electron micrograph of samples was obtained. Adsorption isotherms were determined by BET, Redlich–Peterson, Langmuir, Tempkin, Freundlich, and Dubinin–Radushkevich isotherms, and the results represented Langmuir and Tempkin isotherms as the best fitted one for the adsorption of dye on C1 and C2 (CaO samples), respectively. The adsorption kinetics was studied, and the rate parameters were evaluated at various dye concentrations (10-40 mg L-1) and pH values (3-9). The results conform to the pseudo-second-order kinetics for both samples. Thermodynamic analysis indicates the physical adsorption and endothermic reaction for the adsorption process. Moreover, to model the adsorption process, a computational fluid dynamic model has been performed applying the Matlab CFD code to predict the elimination of BR46 from the aqueous solution by C1 and C2 samples.