Peppermint-Mediated Green Synthesis of Nano ZrO2 and Its Adsorptive Removal of Cobalt from Water

Zirconium oxide nanoparticles (ZrO2NPs) were green synthesized for the first time using an aqueous peppermint extract as a precipitating and capping agent. Addition of to Zr4+ solution was followed by calcination resulting precipitate at 570 700 °C form ZrO2NPs570 ZrO2NPs700, respectively. These oxides characterized X-ray diffraction, transmission electron microscopy, BET surface area analysis, used adsorbents cobalt ions (Co2+) in water. The effects pH, initial Co2+ concentration, ZrO2NPs mass, contact on adsorption efficiency studied. Characterization results showed formation cubic ZrO2 with average crystallite sizes (XRD data) 6.27 7.26 nm TEM images two exhibited nearly spherical measurements indicated mesoporous having areas 94.8 62.4 m2/g, study confirmed that can be efficiently from uptake treated is favored pH values higher than its point zero charge (6.0). In addition, follows pseudo-second order kinetics (R2 = 1.0) explained Langmuir isotherm 0.973).