Mutlu CANPOLAT, Yalçın ALTUNKAYNAK, Ömer YAVUZ

Bakır(II) İyonlarının Sulu Çözeltilerden Atık Portakal Kabuğu İle Uzaklaştırılması: Denge, Kinetik Ve Termodinamik Çalışmalar

Bu çalışmada, sulu çözeltilerden Cu2+ iyonlarını uzaklaştırmak amacıyla atık portakal kabuğu (APK) değerlendirildi. Portakal kabuğunun karakterizasyonu, yüzey morfolojisi için taramalı elektron mikroskobu-enerji dağılım spektroskopisi (SEM-EDS) ve yüzey fonksiyonel grupları için Fourier dönüşümü kızılötesi spektroskopisi (FT-IR) ile incelendi. Farklı sıcaklıklarda bulunan kinetik değerler yalancı birinci derece, yalancı ikinci derece, Elovich ve parçacık içi difüzyon modeli denklemlerine uygulanmıştır. Adsorpsiyon sürecini daha iyi anlamak için Langmuir, Freundlich, Temkin ve Dubinin-Radushkevich (D-R) adsorpsiyon izotermlerinin uygulanabilirliği değerlendirildi. Bakırın uzaklaştırılması yalancı ikinci dereceden kinetik model ile Langmuir izoterm modelini takip etti. Cu2+ için uzaklaştırma kapasitesi 298, 308 ve 318 K'de sırasıyla 7.74, 7.98 ve 8.84 mg/g olarak elde edilmiştir. Cu2+ iyonlarının Gibbs serbest enerjisi (ΔGo), adsorpsiyon ısısı (ΔHo) ve entropisi (ΔSo) için termodinamik veriler sırasıyla -16.76 kj/mol, 29.43 kj/mol ve 154.79 j/mol olarak bulundu.

Studies on the Equilibrium, Kinetic, and Thermodynamic Properties of Waste Orange Peel in the Removal of Copper (II) Ions from Aqueous Solutions

Waste orange peel (APK) was tested for its ability to remove Cu 2+ ions from aqueous solutions in this study. The orange peel was characterized using scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) for surface morphology and Fourier transform infrared spectroscopy (FT-IR) for surface functional groups. At various temperatures, the kinetic data was applied to the pseudo first order, pseudo second order, Weber-Morris diffusion model, and Elovich kinetic equations. The applicability of Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich (D-R) adsorption isotherms was investigated to better understand the adsorption process. Following the elimination of copper, pseudo second order kinetics and the Langmuir model of isotherms were used. At 298, 308, and 318 K, the adsorption capacities for Cu (II) were 7.74, 7.98, and 8.84 mg/g, respectively. The Gibbs free energy (ΔGo), heat of adsorption (ΔHo), and entropy (ΔSo) of Cu(II) ions were identified using thermodynamic data. It was discovered that the values were -16.76 kJ/mol, 29.43 kJ/mol, and 154.79 j/mol, respectively.

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