Thermodynamic and Kinetic Study of Mercury (II) Cation Adsorption from Aqueous Environments Using Oshnavieh Peat Soil
Description
This dataset presents the comprehensive experimental and analytical results of a study investigating the thermodynamic and kinetic aspects of Hg(II) ion adsorption from aqueous solutions onto Oshnavieh peat soil as a natural adsorbent. The research systematically examines the influence of key parameters, including temperature, contact time, adsorbent dosage, initial solution pH, and initial mercury concentration, on adsorption efficiency. The adsorption experiments were conducted using the dispersive solid-phase extraction (DSPE) technique, assisted by an organic solvent to enhance the extraction process. Mercury ion concentrations before and after adsorption were quantitatively determined using a UV-Vis spectrophotometer. To evaluate the adsorption mechanism, kinetic models (pseudo-first-order, pseudo-second-order, and intraparticle diffusion models) and isotherm models (Langmuir, Freundlich, and Dubinin–Radushkevich) were applied to the experimental data. Additionally, the thermodynamic parameters—including Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°)—were calculated to determine the spontaneity and feasibility of the adsorption process. This dataset includes: 1- Raw experimental data for adsorption efficiency under varying conditions. 2-Calibration curves and absorbance data from spectrophotometric analysis. 3-Isotherm and kinetic model fitting results along with statistical evaluation. 4-Thermodynamic calculations and corresponding plots. The provided data can serve as a valuable resource for researchers studying heavy metal removal, adsorption mechanisms, and environmental remediation strategies. Keywords: Mercury adsorption, Peat soil, Kinetics, Thermodynamics, Solid-phase extraction, Heavy metal removal