Abstract
Transparent nanoplates of Diaqua oxalato strontium(II) [Sr(C2O4)(H2O)(2)], SrOx-NPs, were prepared and employed as adsorbents in an aqueous solution of azodye Eriochrome Black T (EBT). X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and Fourier-transform infrared spectra were used to investigate the structure and morphology of SrOx-NPs. To identify the optimal conditions for EBT adsorption by SrOx-NPs, studies were carried out at initial dye concentrations, adsorbent doses, contact reaction time, pH, and temperature. The investigations revealed that the best conditions for EBT adsorption on the SrOx-NPs surface were natural pH (pH = 6), dose concentration of 0.5 g L-1, initial dye concentration of 40 mg L-1, and temperature 25 degrees C. The equilibrium uptake increased as the amount of SrOx-NPs increased. Fitting the findings of the adsorption studies to Langmuir and Freundlich isotherms were used to examine them. The best fit is provided by the Freundlich model, which has an adsorption capacity of 63 mg g(-1) and a correlation value of R-2 = 0.9837%. The kinetic mechanism of adsorption was investigated using pseudo-first-order and pseudo-second-order kinetic models. The experimental data matches well with a pseudo-second-order kinetic model, with a correlation value of 0.96. The adsorption process's thermodynamic parameters were also determined.