Akademik Veri Yönetim Sistemi
Journal of Molecular Liquids, cilt.433, 2025 (SCI-Expanded)
The present study deals with the usability of quince leaves for the removal of safranin dye. Optimisation was done on the variables that affect the biosorption efficiency, including pH, contact time, and amount of biosorbent. Temkin, Freundlich, Dubnin-Radushkevich (D-R), Langmuir, and Scatchard isotherm models, both linear and nonlinear, were used to assess the equilibrium biosorption evidence. The order of fit of the models for correlation coefficients was Langmuir > Freundlich > Temkin > D-R > Scatchard, and they were all very close to 1. The highest correlation coefficient (R2) = 0.9878) was obtained from the Langmuir isotherm, which showed that biosorption was more compatible with Langmuir than other models. 666.67 mg g−1 was the maximum adsorption capacity determined using the Langmuir isotherm, and the RL values showing the affinity between adsorbate and adsorbent were found in the range of 0.032–0.769. The chemical nature of the biosorption process is demonstrated by the sorption energy of 15.81 kJ mol−1 determined by the D-R isotherm model. Entropy (ΔS° = 41.29J mol−1 K−1), enthalpy (ΔH° = 7.30kJ mol−1), and Gibbs free energy (ΔG° = −4.014kJ mol−1), the thermodynamic parameters related to the biosorption process, demonstrated that the adsorption of safranin dye onto quince leaves was spontaneous, endothermic, and feasible. The present study used pseudo-first order (PFO), pseudo-second order (PSO), Elovich, and intraparticle diffusion (IPD) models to assess the biosorption process's kinetics. The findings revealed a strong agreement between the experimental data and both the PSO model (with the highest R2 value of 0.9893) and the Langmuir isotherm, indicating that the adsorption mechanism follows chemisorption. The reusability of the adsorbent was investigated and 92 % desorption was achieved from the dye-loaded adsorbent with 0.2 M ethyl alcohol. Calculations using Density Functional Theory (DFT) were also conducted to substantiate the biosorbent's high affinity for safranin dye.