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    Adsorptive removal of methylene blue by fruit shell: Isotherm studies
    (Taylor & Francis Inc, 2018) Ozdemir, Cigdem Sarici
    In this study, methylene blue adsorption was investigated using different agricultural waste shells (chestnut shell, hazelnut shell, walnut shell). XRD (X-Ray Diffraction), SEM (Scanning Electron Microscopy), FTIR (Fourier Transform Infrared Spectroscopy) analyzes were performed for the characterization of shells. The effects of mixing time, initial methylene blue concentration, temperature and adsorbent amounts were determined for methylene blue adsorption. Equilibrium isotherms for adsorption of methylene blue by chestnut, hazelnut and walnut shell were experimentally measured. The obtained data were analyzed using linear and nonlinear correlations for different temperatures using the Langmuir, Freundlich, Dubinin-Radushkevich, Frumkin, Temkin, Elovich, Hill, isotherms. The best results on methylene blue adsorption on these adsorbents were obtained in chestnut shell.
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    Applications of dye adsorption in fixed bed column and modeling studies
    (Desalination Publ, 2021) Onay, Muhammed; Ozdemir, Cigdem Sarici
    In this study, adsorption studies of an aqueous solution of malachite green dye were made in a fixed bed using a thermal power plant. The effects of concentration, flow rate, adsorbent amount, and pH on adsorption applications were investigated. Thomas, Adams-Bohart and Yoon-Nelson models were used to evaluate the results obtained. In addition, the correlation between the model and the experimental data was compared using seven non-linear functions, while the adsorption dynamics of the fixed bed column were modeled. Scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy were used for the characterization of adsorbents. The results were compared with the results of previous studies and suggestions for adsorption applications were made accordingly. Yoon-Nelson models showed a good agreement with the experimental data. After the calculations, the maximum adsorption capacity of the fly ash dye was determined as 41.453 mg g(-1).
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    Equilibrium, kinetic, diffusion and thermodynamic applications for dye adsorption with pine cone
    (Taylor & Francis Inc, 2019) Ozdemir, Cigdem Sarici
    In the present study, the adsorption of methylene blue onto pine cone was investigated. Adsorbent was characterized by XRD and SEM. The adsorption data follow the Langmuir isotherm model. Maximum adsorption capacity was calculated 125 mg.g(?1) . It was determined that the pseudo-second-order model was the best choice among all the available kinetic models to describe the adsorption behaviour. E-a was found to be 19.57?kJ mol(?1.) This confirms the fact that the adsorption was a physical process. The negative free energy values indicate the feasibility of the adsorption process and its spontaneous nature.