Synthesis and application of perovskite nanoparticles for the adsorption of ketoprofen and fenoprofen in wastewater for sustainable water management

Perovskite chemicals such as CeCoO3 and SrCoO3-δ nanocomposites were used for the adsorption of ketoprofen and fenoprofen from aqueous solution. The adsorption capacity was determined by the effect of pH, contact time, dye concentration and adsorbent dose. The adsorption capacity was detected in CeCoO3 for ketoprofen (41.666 mg g-1) and fenoprofen (15.313 mg g-1) and in SrCoO3-δ for ketoprofen (28.409 mg g-1) and fenoprofen (93.457 mg g-1). The adsorption kinetics were measured using the pseudo-first order, pseudo-second order, Elovich and intraparticle diffusion models. The pseudo-second order model best described the data and gave an R2 value of 0.999.The isothermal adsorption models studied for the adsorption of drugs on SrCoO3-δ and CeCoO3 perovskite nanocomposites are Langmuir, Freundlich, Temkin, Dubinin-Radushkevich (D-R), Sips and Redlich-Peterson (R-P) isothermal models. Among the different adsorption isotherms tested, the D-R isotherm gave the best fit to the equilibrium data for the adsorption of ketoprofen and the Freundlich isotherm gave the best result for the adsorption of fenoprofen. Effective desorption of ketoprofen and fenoprofen from the loaded adsorbents was achieved by using acetone or ethanol with desorption efficiency in the range of 89-93%.