Sentetik atıksulardan atık çay sorbentine Cu+2 biyosorpsiyonu: kinetikler, eşitlikler ve termodinamik

Öz

𝐶𝑢+2’nin atık çaya (AÇ) biyosorpsiyonu kesikli deneyler ile araştırılmıştır. AÇ’nin giderme verimi ve biyosorpsiyon kapasitesi (𝑞𝑒), pH, temas süresi, başlangıç 𝐶𝑢+2derişimi, sıcaklık ve AÇ dozuna göre araştırılmıştır. AÇ’ın 𝑞𝑒 değeri, çözelti sıcaklığı arttıkça yükselmiştir. Deneysel çalışmalar ile elde edilen 𝑅2, 𝑞𝑑𝑒𝑛 ve 𝑞ℎ𝑒𝑠 değerlerine göre adsorpsiyon eşitliği en iyi, Langmuir izoterm modeli ile tanımlanmaktadır. AÇ’ye en yüksek 𝐶𝑢+2 biyosorpsiyonu, başlangıç pH ve sıcaklığı olan 6.0 ve 55 °C’de olduğu belirlenmiştir. Deneysel sonuçlar, AÇ’ye, 𝐶𝑢+2 biyosorpsiyonunun endotermik bir reaksiyon olduğunu göstermektedir. Kinetik modeller karşılaştırıldığında biyosorpsiyon en iyi yalancı II. derece kinetik model tarafından tanımlanmaktadır. Negatif ΔG˚ değeri AÇ’ye 𝐶𝑢+2 biyosorpsiyonunun uygulanabilir olduğunu göstermektedir.

Anahtar Kelimeler

• Atık çay
• Biyosorpsiyon
• Bakır
• Biyoatık

Biosorption of Cu2+ from synthetic wastewater by tea waste sorbent: kinetics, equilibrium and thermodynamics

Abstract

The biosorption of 𝐶𝑢2+ onto the tea wastes (TW) was investigated by performing the batch experiments. The removal efficiency and biosorption capacity (𝑞𝑒) of TW was investigated as a function of pH, contact time, initial 𝐶𝑢2+ concentration, temperature, and TW dose. The 𝑞𝑒 value of TW increased with the increase of solution temperatures. According to the 𝑅2 value, 𝑞𝑒𝑥𝑝 and 𝑞𝑐𝑎𝑙, the adsorption equilibrium was well described by the Langmuir isotherm model. The highest sorption of 𝐶𝑢2+ onto TW was observed at the initial pH value and temperature of 6.0 and 55 °C, respectively. Experimental results confirming that the biosorption reaction of 𝐶𝑢2+on the TW was thought to be endothermic. By the comparison of kinetic models, results demonstrated that the system was best described by the pseudo second-order kinetic model. The negative ΔG˚ value indicated that the 𝐶𝑢2+sorption onto the TW is feasible.

Keywords

• Biosorption
• Biowaste
• Copper
• Waste tea

Kaynakça

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