Biosorption of Cu2+ onto Biyological Waste Nitrification Organisms

Öz

The biosorption of Cu²⁺ ions from aqueous solutions onto the dry waste nitrification organisms (DWNO) which were enriched in the laboratory was investigated in batch experimental system with respect to the temperature, initial Cu²⁺ concentrations, pH, and biosorbent doses. Considering the R² value, q_exp and q_cal, the adsorption equilibrium was well described by the Langmuir isotherm model which is suggesting that the Cu²⁺ ions were adsorbed onto the DWNO in a monolayer. The value of q_e increased with increasing the temperature while also increases the release of organic matter and NH₄-N from the DWNO. The highest sorption of Cu²⁺ onto DWNO was determined at the initial pH value and temperature of 5.0 and 55°C, respectively. The results confirming that the biosorption reaction of Cu²⁺ on the DWNO was thought to be endothermic. A comparison of the kinetic models such as pseudo first and second-order kinetics, intraparticle diffusion, and Elovich on the sorption rate demonstrated that the system was best described by the pseudo second-order kinetic model. The value of ΔG° was decreasing with increasing temperature. It indicates that the adsorption process leads to an increase in Gibbs energy. The negative ΔG° value means the Cu²⁺sorption onto the DWNO is feasible.

Anahtar Kelimeler

• Biosorption,Copper,Nitrification Organisms,Biowaste Sludge

Biyolojik Atık Nitrifikasyon Organizmasına Cu+2 Biyosorpsiyonu

Öz

Laboratuvarda geliştirilen kuru atık biyolojik nitrifikasyon organizmasına (KANO), Cu⁺² iyonlarının biyosorpsiyonu, sıcaklık, başlangıç Cu⁺² derişimi, pH ve biyosorbent dozuna göre kesikli ünitelerde araştırılmıştır. Deneysel çalışmalar ile elde edilen R², q_den ve q_hes değerleri göz önüne alındığında, adsorpsiyon eşitliği, Cu⁺² iyonlarının KANO’ya biyosorpsiyonu, tek kademe olarak belirtilen en iyi, Langmuir izotermi tarafından tanımlanmaktadır. Deneysel çalışmalarda belirlenen q_e değeri, çözelti sıcaklığı arttıkça yükselirken, KANO yapısından sıcaklık ve pH’a bağlı olarak çözeltiye salınan organik madde ve NH₄-N artmaktadır. KANO’ya en yüksek Cu⁺² biyosorpsiyonu, başlangıç pH ve sıcaklığı olan 5,0 ve 55 °C’de olduğu belirlenmiştir. Deneysel sonuçlar, KANO’ya, Cu⁺² biyosorpsiyonunun endotermik bir reaksiyon olduğunu göstermektedir. Sorpsiyon hızı için kinetik modeller, yalancı I. derece ve yalancı II. derece, partikül içi difüzyon, Elovich karşılaştırıldığında, adsorpsiyonun en iyi yalancı II. derece kinetik model tarafından tanımlandığını göstermektedir. ΔG° değeri sıcaklık arttıkça azalmaktadır. Bu durum adsorpsiyon sürecinin Gibbs enerjisinin artmasını sağlamaktadır. Negatif ΔG° değeri, KANO üzerine Cu⁺² biyosorpsiyonunun uygulanabilir olduğu anlamına gelmektedir. 

Anahtar Kelimeler

• Biyosorpsiyon,Bakır,Nitrifikasyon Organizması,Biyoatık Çamur

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