yyufbed Yüzüncü Yıl Üniversitesi Fen Bilimleri Enstitüsü Dergisi 1300-5413 2667-467X Van Yüzüncü Yıl Üniversitesi 10.53433/yyufbed.1812282 Wastewater Treatment Processes Separation Processes Water Treatment Processes Atıksu Arıtma Süreçleri Ayırma İşlemleri Su Arıtma Süreçleri Kızılcık ile Metilen Mavisi Giderimi için Adsorpsiyon Proses ve Mekanizmasının Değerlendirilmesi: İzoterm, Kinetik ve Termodinamik Çalışmaları Assessment of Adsorption Process and Mechanism for Methylene Blue Removal on Cranberry: Isotherm, Kinetic and Thermodynamic Studies https://orcid.org/0000-0001-9331-775X Kul Ali Rıza VAN YÜZÜNCÜ YIL ÜNİVERSİTESİ https://orcid.org/0000-0001-9884-0961 Aldemir Adnan Van Yüzüncü Yıl Üniversitesi 04 29 2026 31 1 18 10 28 2025 01 19 2026 Copyright © 1995, Yüzüncü Yıl Üniversitesi Fen Bilimleri Enstitüsü Dergisi 1995 Yüzüncü Yıl Üniversitesi Fen Bilimleri Enstitüsü Dergisi

Bu çalışmada Metilen Mavisinin (MB) sulu çözeltilerden giderimi için kızılcık ile hazırlanan adsorbent (CBA) kullanıldı. Başlangıç MB derişimi (15–75 mg L⁻¹), sıcaklık (298 K–318 K), ve temas süresi (10–180 dk) çalışma parametrelerinin etkileri araştırıldı. 35 mg L⁻¹ başlangıç MB derişimi için giderim değerleri 298 K, 308 K ve 318 K’ de sırasıyla %79,3, %82,9 ve %85,8 olarak belirlendi. 318 K’de en yüksek adsorpsiyon kapasitesi (qₘ) 91,743 mg g⁻¹ olarak elde edildi. Deneysel veriler izoterm model, kinetik çalışmalar ve termodinamik analizler ile değerlendirildi. Temkin modeli, dört izoterm model (Langmuir, Freundlich, Dubinin–Radushkevich ve Temkin) arasından deneysel verilere en uygun model olarak belirlendi. Adsorpsiyon kinetiği üç model ile değerlendirildi ve adsorpsiyon prosesi en yüksek korelasyon katsayısı (R²) değerlerine sahip yalancı ikinci derece (PSO) kinetik model ile açıklandı. 318 K’de 65 mg L⁻¹ başlangıç MB derişimi için yapılan termodinamik hesaplamalarda negatif Gibbs serbest enerji değeri (-2942.16 J mol⁻¹), pozitif enthalpi değeri (16618,02 J mol⁻¹) ve pozitif entropi değeri (61,51 J mol⁻¹K⁻¹) elde edildi. Bu sonuçlara göre adsorpsiyon prosesinin spontane ve endotermik yapıda olduğu belirlendi ve adsorpsiyon olayının aktivasyon enerjisi 14,44 kJ mol⁻¹ olarak hesaplandı. Bu bulgular atıksulardan boya kirliliklerinin etkili giderimi için klasik adsorbentlere alternatif olarak düşük maliyetli kızılcık ile hazırlanan adsorbentin kullanılabileceğini göstermiştir.

In the present study, cranberry based adsorbent (CBA) was used for the removal of Methylene Blue (MB) from aqueous solutions. The influences of operational parameters, including initial MB concentration (15–75 mg L⁻¹), temperature (298 K–318 K) and contact time (10–180 min), were systematically examined. The removal efficiencies at the 35 mg L⁻¹ initial MB concentration were determined to be 79.3%, 82.9% and 85.8% at the 298 K, 308 K and 318 K, respectively. The maximum adsorption capacity (qₘ) was achieved at 91.743 mg g⁻¹ at 318 K. Experimental data were evaluated using adsorption isotherm models, kinetic studies and thermodynamic analyses. Temkin model was provided the best fit to the experimental data among the applied four isotherm models (Langmuir, Freundlich, Dubinin–Radushkevich and Temkin). Adsorption kinetics were evaluated with three models and adsorption process was followed the pseudo second order (PSO) kinetic model most accurately, which has the highest R² values. Thermodynamic analysis for adsorption of 65 mg L⁻¹ initial MB concentration at 318 K was revealed negative values for Gibbs free energy (-2942.16 J mol⁻¹), along with positive enthalpy values (16618.02 J mol⁻¹) and entropy (61.51 J mol⁻¹K⁻¹). These results were showed that adsorption process was spontaneous and endothermic in nature and the activation energy was calculated to be 14.44 kJ mol⁻¹. These results suggested that prepared cranberry adsorbents was represented a promising low-cost alternative to conventional adsorbents for effective removal of dye pollutants from wastewater.

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