NİKEL (II) İYONLARININ ATIK ÇAY’A BİYOSORPSİYONU: DENGE, KİNETİK VE TERMODİNAMİK ÇALIŞMALARI

Abstract

Bu çalışmada atık çay (AÇ) kullanılarak Ni(II) iyonunun biyosorpsiyonu araştırılmıştır. Ni(II) giderme veriminin (E) ve biyosorpsiyon kapasitesinin (qe) belirlenebilmesi amacıyla temas süresi, sıcaklık, pH, başlangıç Ni(II) derişimi ve AÇ dozu gibi çeşitli deney koşulları altında kesikli deneyler yapılmıştır. Biyosorpsiyonun ilk dakikalarda çok hızlı gerçekleştiği ve ilk 30 dk.’da dengeye ulaşıldığı tespit edilmiştir. Ayrıca pH’ın yükselmesi ile biyosorpsiyon veriminin arttığı ve pH 5–7 arasında en yüksek değerlerde olduğu ve çözelti sıcaklığının artmasıyla qe’nin de yükseldiği belirlenmiştir. Deneysel veriler kullanılarak hesaplanan R2, qden ve qhes değerlerine göre adsorpsiyon eşitliğin en iyi, Langmuir ve Temkin izoterm modelleri ile tanımlanmaktadır. Deney verileri Ni(II) iyonlarının AÇ’ye biyosorpsiyonunun ekzotermik bir reaksiyon olduğunu göstermektedir. Kinetik modeller kıyaslandığında, biyosorpsiyonun en iyi yalancı II. derece kinetik model tarafından tanımlandığı belirlenmiştir. Termodinamik parametreler adsorpsiyon işleminin AÇ tarafından Ni(II) iyonlarının uzaklaştırılmasında kullanılabileceğini göstermektedir. Ayrıca farklı çözücüler ile yapılan desorpsiyon çalışmasında AÇ’nin sorbent olarak yeniden kullanabilirliği belirlenmiştir.

Keywords

• Biyosorpsiyon
• Nikel
• Atık Çay
• Denge
• Kinetik

BIOSORPTION OF NICKEL (II) IONS ONTO TEA WASTE: EQUILIBRIUM, KINETIC AND THERMODYNAMIC STUDIES

Abstract

In this study, the biosorption of Ni (II) ions onto the tea waste (TW) was investigated. The batch experiments were carried out to determine the removal efficiency (E) and biosorption capacity (qe) of Ni (II) under various experimental conditions such as contact time, temperature, pH, initial Ni (II) concentration and TW dose. It was determined that the biosorption was very fast in the first minutes and the equilibrium was reached in the first 30 minutes. The biosorption efficiency increased with the increase of pH and the highest sorption of Ni(II) onto the TW was observed at the initial pH values between 5–7. The qe value increased with the increase of solution temperature. According to the R2 value, qexp and qcal, the adsorption equilibrium was well described by the Langmuir and Freundlich isotherm models. Experimental data show that the biosorption of Ni(II) ions onto the TW is an exothermic reaction. By the comparison of kinetic models, results demonstrated that the system was best described by the pseudo second–order kinetic model. Thermodynamic parameters show that the adsorption process can be used to remove Ni (II) ions by the TW. It was also revealed in the desorption studies conducted with different solvents that the TW could be reuse after desorption.

Keywords

• Biosorption
• Nickel
• Tea Waste
• Equilibrium
• Kinetic

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