Yazar "Dal, Mehmet Can" seçeneğine göre listele

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  • Küçük Resim
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    Adsorption of nickel(II) ions from aqueous solutions using Malatya clay: Equilibrium, kinetic, and thermodynamic studies
    (John Wiley and Sons Inc., 2023) Onursal, Nilgün; Altunkaynak, Yalçın; Baran, Ayşe; 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.
  • Küçük Resim
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    CU(II), Nİ (II) ve CO(II)'nin Karacadağ skoryası ile adsorpsiyonunun izoterm, kinetik ve termodinamik analizi
    (Dicle Üniversitesi, Fen Bilimleri Enstitüsü, 2021) Dal, Mehmet Can; Yavuz, Ömer
    Bu çalışmada Cu(II), Ni(II), ve Co(II) iyonlarını sulu çözeltiden gidermek için adsorplayıcı olarak, ucuz maliyetli Karacadağ Skoryası (BR1) kullanıldı. BR1; XRD, XRF, FT-IR, BET ve SEM gibi yöntemlerle karekterize edildi. BR1'in irili ufaklı gözenek hacimlerinin, toplam hacmin yarısını bulduğu görüldü. Elde edilen denge verileri Langmuir, Freundlich,Temkin ve Dubinin Radushkevich (D-R) adsorpsiyon modellerine, kinetik veriler ise; yalancı-birinci dereceli model, yalancı-ikinci dereceli model (Ho ve McKay modeli), Weber-Morris ve Elovich modellerine uygulandı. Regresyon analizleri sonucu; denge çalışmaları için Langmuir Modeli, kinetik çalışmaları için ise yalancı-ikinci dereceli model, en uygun modeller olarak bulundu. Cu(II) iyonu 298,313 ve 328 K sıcaklıklarında yapılan adsorpsiyon deneylerinde qm değeri sırasıyla 1,83, 2,23 ve 3,09 mgg-1, 298 313 v3 323 K sıcaklıklarında elde edilen qm değerleri Ni(II) için; 0,73, 1,31 ve 1,80 mgg-1, Co(II) için 0,56, 0,93 ve 1,36 mgg-1 olarak bulundu. Termodinamik çalışmalarda Cu(II) iyonu için 298,313 ve 328 K sıcaklıklarında ?G değerleri sırasıyla -13,37 -17,12 ve -20,86 kJmol-1; 298,313 ve 323 K sıcaklıklarında ?G değerleri Ni(II) iyonları için sırasıyla -11,55 -15,07 ve -17,41, Co(II) iyonları için sırasıyla -10,36 -14,72 ve -17,63 kJmol-1 olarak bulundu. Cu(II), Ni(II) ve Co(II) için ?H değerleri sırasıyla 61,04 58,3 ve 76,36 kJmol-1 olarak bulundu. ?S değerleri de yine sırasıyla 0,2497 0,2344 ve 0,2910 kJmol-1K-1 olarak bulundu. Termodinamik çalışmalarda ?H değerlerinin pozitif değerli oluşu; adsorpsiyon olayının endotermik olduğunu ve ?G değerlerinin negatif oluşu ise olayın kendiliğinden cereyan ettiğini gösterdi.
  • Küçük Resim
    Öğe
    Geven (astragalus) balının kimyasal bileşiminin araştırılması
    (2016) Dal, Mehmet Can; Yılmaz, Hayrullah
    Bu çalışmada Diyarbakır yöresinden alınan Geven {Astragalus) balının kimyasal bileşimi incelenmiştir. Bal örneğinde invert şeker, sakkaroz, su, kül, asidite, prolin, hidroksimetilfurfural (HMF) ve diastaz aktivite tayinleri Association of Official Analytical Chemists (AOAC) ve Türk Standartları Enstitüsü (TSE)'nin kabul ettiği stan dart yöntemlerle yapıldı. Sonuçlar TSE standartlarına uyumluluk gösterdi. Bulunan değerler: HMF 17,9 mg kg"1; diastaz sayısı 26,1 ; su % 17,4 ; invert şeker % 73,9 ; sakkaroz % 1,5 ; kül % 0,25 ; prolin 86,0 mg/100g ; pH 4,3 ; serbest asit 26,0 meq kg'1 ve lakton 5,0 meq kg"1. Ayrıca, balın amilaz enzimi kısmen saflaştırılarak; enzimin nişasta, glikojen ve heparin bileşikleri üzerindeki etkisi incelendi. Kullanılan bu bileşiklerden nişastanın en uygun substrat olduğu belirlendi. Amilazın enziminin optimum pH ı; nişasta, glikojen ve heparin için sırasıyla 5,5, 5,0 ve 7,0 olarak bulundu.
  • Küçük Resim
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    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 Science and Business Media Deutschland GmbH, 2023) Onursal, Nilgün; 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 q m 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 ΔG = − 24.394, − 33.724 and − 43.054 kJ mol−1 ΔH = 53.039 kJ mol−1, ΔS = 0.181 kJ mol−1 K−1.
  • [ X ]
    Öğe
    Modeling of the Linear Equations of Langmuir Isotherm in the Adsorption of Cd (II) Ion with Siirt Kurtalan Koçpinar Clay
    (2024) Dal, Mehmet Can
    Langmuir isotherm model has been widely used by researchers in adsorption isotherm studies for more than a century. During the process, 6 linear equations have been derived from the Langmuir model, which is a non-linear model. This study focuses on these 6 equations which are rarely given together. In this study, the performance of clay mineral in the removal of a heavy metal known for its harmful effect, such as cadmium, from solution was measured. The data obtained as a result of adsorption of cadmium (II) ion with clay from Siirt Koçpınar region at a temperature of 298 K were applied to 6 linear equations derived from Langmuir isotherm model. As a result, it was determined that the degree of suitability of the models for adsorption was type 3= type 6 < type 1= type 4 < type 2 = type 5 and the most suitable R2 values belonged to type 2 and type 5 with values of 0.992. The largest qm value was found to belong to type 4 with a value of 86,608 gmg-1.