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    Öğe
    Adsorption of nickel(II) ions from aqueous solutions using Malatya clay: Equilibrium, kinetic, and thermodynamic studies
    (Wiley, 2023) Onursal, Nilgun; Altunkaynak, Yalcin; Baran, Ayse; Dal, Mehmet Can
    This paper evaluates Malatya clay (MC) for the removal of Ni(II) ions from aqueous solutions. For adsorption efficiency, the impacts of several factors, such as pH, starting metal ion concentration, and contact duration, were examined. The optimal initial Ni(II) ion concentration was determined to be 5 mg/L, the adsorption contact duration was 360 min, and the solution's pH was 6.27. Using scanning electron microscopy, energy dispersive spectroscopy, and Fourier transform infrared spectroscopy, the surface characteristics of Malatya clay were examined. The isotherm data fit the Langmuir isotherm model, indicating chemical adsorption and likely irreversibility of the process, according to the results. At 298, 308, and 318 K, the adsorption capacities of Ni(II) were determined to be 10.267, 11.834, and 12.285 mg/g, respectively. Adsorption kinetic data revealed that the adsorption of Ni(II) metal ions followed the pseudo-second-order kinetic model. According to thermodynamic studies, Ni(II) ion adsorption on the MC is spontaneous and endothermic. MC has proven to be an effective and alternative material for the removal of Ni(II) ions from aqueous media due to its excellent removal ability, availability, and low cost, as well as its features such as being able to be used without any chemical treatment and being environmentally friendly.
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    Öğe
    Diyarbakır Karacadağ Kırmızı Tepe Skoryası ile Cu(II) Adsorpsiyon Kinetiğinin İncelenmesi
    (2021) Dal, Mehmet Can; Onursal, Nilgün; Arıca, Enes; Yavuz, Ömer
    Bu çalışmada Diyarbakır bölgesinin Karacadağ Kırmızı Tepe volkan konisinden alınan bazaltik pomza (BR1) adsorplayıcı olarak kullanılmıştır. BR1’in mikroskobik ve makroskopik özellikleri belirlendi. BR1, XRD, XRF, BET, FTIR, BET ve SEM gibi yöntemlerle karakterize edildi. Adsorpsiyona etki eden parametrelerden olan farklı süre ve sıcaklıklarda çalışıldı. Adsorpsiyon miktarları 298, 313 ve 328 K için sırasıyla 1.97, 2.15 ve 2.58 mg g-1 olarak bulundu. Deneyden elde edilen veriler; Lagergren yalancı birinci dereceden kinetik modeli (pseudo firs tmodel), Ho-McKay yalancı ikinci dereceden modeli (pseudo second model), parçacık içi difüzyon modeli (Weber- Morris model), ve Elovich kinetik modeli olmak üzere 4 kinetik modele uygulandı. Cu(II) nin adsorpsiyon kinetik mekanizmasının, en çok Ho McKay modeli olarak bilinen ikinci dereceden hız denklemine uyduğu görülmekle beraber, Elovich hız denklemine de uyduğu değerlendirildi.
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    Öğe
    Investigation of isotherm and thermodynamic parameters of adsorption of copper (II) ions in aqueous solution with natural mixed type Siirt clay (NMTSC-2) and new (second) linear equation derived from Harkins-Jura isotherm
    (Springer Int Publ Ag, 2024) Onursal, Nilguen; Dal, Mehmet Can
    In this study, it was aimed to remove Cu (II) ions from the aqueous solution by Natural Mixed Type Siirt Clay (NMTSC-2) from the aqueous solution. NMTSC-2 (clay containing chlorite, montmorillonite, vermiculite, muscovite, kaolinite and illite) was characterized by analysis methods of X-ray fluorescence spectroscopy (XRF), Fourier transform infrared, (FT-IR) spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscope (FESEM-EDS), Brunauer-Emmett-Teller (BET) and thermogravimetric analysis (TGA). The data obtained as a result of the experimental studies were applied to the Freundlich, Langmuir, Temkin, Elovich and Dubinin-Radushkevich (D-R), Harkins-Jura adsorption isotherms. In the study, a new linear equation was derived from the Harkins-Jura model. The new form was applied to the NMTSC-2 adsorption experiment of Cu (II), the obtained constants and the plots were given in the study. In order to compare the models, the results were subjected to regression analysis. The new linear equation was found to be the most suitable model for the experimental data. The Langmuir model was the second most compatible with the experimental data. In adsorption experiments were performed at 298, 308 and 318 K temperatures, Cu (II) ion qm values were found as 21.146, 25.380 and 29.850 mg g-1, respectively. Thermodynamic data for 298,308 and 318 K temperatures were found as Delta G = - 24.394, - 33.724 and - 43.054 kJ mol-1 Delta H = 53.039 kJ mol-1, Delta S = 0.181 kJ mol-1 K-1.