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  • [ X ]
    Öğe
    Adsorption behavior of methylene blue onto four different coffee residues
    (2023) Tekne, Ecem; Ozüdogru, Yelız
    In this study, four coffee residues were investigated for the adsorption of methylene blue from aqueous solution. The four coffee residues were Jacobs Monarch Coffee, Tchibo Professional Special Filter Coffee, Turkish Coffee (Mehmet Efendi), and Anisah Guatemala Coffee. These coffees were washed with distilled water, and dried up to 60 °C. Adsorption mechanisms, such as pH, contact time, concentration of methylene blue, and temperature, were investigated. The characterization of the samples (before and after adsorption with methylene blue) was performed using FTIR and SEM analyses. Langmuir and Freundlich isotherms were used to determine the adsorption mechanisms. The FTIR findings indicated that methylene blue bonded with the hydrogen bonds. The results showed that the maximum adsorption capacity was 67,14 mg/g at 298 K for Turkish coffee. It can be understood that, coffee residue (especially Turkish coffee) was a cost-effective and eco-friendly material for removing methylene blue from aqueous solution.
  • [ X ]
    Öğe
    Adsorption of Methylene Blue from Aqueous Solution Using Spent Coffee/Chitosan Composite
    (Pleiades Publishing Inc, 2023) Ozudogru, Yeliz; Tekne, Ecem
    This study aimed to investigate the adsorption of Methylene Blue from aqueous solution using different concentrations of spent coffee/chitosan composite. Adsorption parameters such as pH, contact time, initial Methylene Blue concentration, and temperature were investigated. Characterization of the adsorbent was performed with Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDX). The FTIR findings showed that the hydrogen bond is a predominant contributor to the adsorption of MB by absorbed. The equilibrium data were analyzed with Langmuir and Freundlich isotherms, and kinetic models were also applied. The maximum adsorption capacity was noted to increase with an increase in temperature, from 298 to 308 K, but then decreased from 308 to 318 K. The highest maximum adsorption capacities among all coffee/chitosan beds were 75.76 mg g(-1) at 298 K, 108.7 mg g(-1) at 308 K, and 33.67 mg g(-1) at 318 K. These results show that a waste coffee/chitosan composite is a cost-effective, eco-friendly material for removing methylene blue from aqueous solution.
  • Küçük Resim
    Öğe
    Kahve ile sulu çözeltide bulunan metilen mavisi boyar maddesinin adsorpsiyonu
    (Çanakkale Onsekiz Mart Üniversitesi, 2023) Tekne, Ecem; Özüdoğru, Yeliz
    Bu çalışmada sulu çözeltide bulunan metilen mavisi boyar maddesinin giderimi için dört farklı çeşitteki atık kahve telveleri kullanılmıştır. Metilen mavisi boyar maddesinin giderimin de atık su arıtımın da yüksek verim sağlayan bir yöntem olarak adsorpsiyon tercih edilmiştir. Çalışma da en yüksek verimin elde edildiği ortamın belirlenebilmesi için pH, süre, konsantrasyon ve sıcaklık gibi farklı adsorpsiyon etkileri denenmiştir. Elde edilen sonuçlar incelenerek en iyi izoterm modelinin belirlenmesin de Langmuir ve Freundlich izoterm modelleri kullanılmıştır. FTIR ve SEM analizleri ile adsorpsiyon olayının yüzeyde meydana getirdiği değişimler incelenmiştir. Elde ettiğimiz sonuçlara göre, metilen mavisinin en yüksek adsorplama kapasitesinin dört farklı kahve grubu içinde Türk kahvesine ait olduğu görülmüştür. Türk kahvesi telvelerinin pH 7 değerinde 318 K'de 100 dakikada Langmuir izoterm modeline göre 67,14 mg/g maksimum adsorplama kapasitesine sahip olduğu belirlenmiştir. Sonuç olarak, dört farklı kahve grubu içerisinde, özellikle Türk kahvesi telvelerinin, sucul ortamda bulunan metilen mavisi boyar maddesinin gideriminde oldukça yüksek adsorplama kapasitesine sahip olduğu tespit edilmiştir.