Statistical applications for photocatalytic dye degradation and sorption models study assess by Co3O4 nanoadsorbent

Abstract

In the present manuscript, Co3O4NPs were synthesized via liquid based chemical process and the obtained NPs were well characterized through various techniques such as SEM, TEM, XRD, FTIR and TGA. The synthesized NPs were employed for chemisorption studies and photocatalytic dye degradation under the UV–visible light irradiation. The Co3O4NPs nanoadsorbent displayed good feasibility, greater adsorption capacity (43.327 mg g−1), more sensitive and highly convenient for the degradation of Safranine dye (SA, efficiency 81.40%). The statistical optimization and validations methods were opted to analyze the kinetic pseudo second order (R2 = 0.999) and equilibrium Langmuir isotherm model (R2 = 0.999). The thermodynamic parameters were also countable heat change, which encourages the adsorption maximum, increases rapidly at temperature 308 K. Overall in sorption process, the Co3O4NPs exhibit good affinity with reliable quantity for the degradation of SA dye and it reveals that reaction was spontaneous and endothermic in nature. The BET surface analysis supports the sorption process, which states that smaller particle size facilitates, grater surface area (Langmuir ~72.7 m2/g) of the product. The analysis provides stability and reusability of photocatalytic nanoadsorbent after four successive cycle experiments in degradation process.