Atık yumurta kabuklarından sentezlenen hidroksiapatitin Remazol N.Blue RGB boyarmaddesinin adsorpsiyonunda değerlendirilmesi

Öz

Bu çalışmada Remazol N.Blue RGB (RB203) boyar maddesinin sulardan giderimi için hidroksiapatit malzemesi hazırlanmıştır. Hidroksiapatit malzemesinin sentezinde kalsiyum kaynağı olarak atık yumurta kabukları değerlendirilmiştir. Hidroksiapatit sentezi çöktürme metoduyla üç farklı pH’ta (pH 9, 10 ve 11) gerçekleştirilmiştir. Kalsinasyon öncesi ve sonrası yumurta kabuklarına XRF, XRD ve SEM analizleri yapılmıştır. Sentezlenen hidroksiapatit TGA-DTA, XRD ve FTIR analizleriyle karakterize edilmiştir. Karakterizasyon çalışmaları sonucunda, pH 10 ortamında hidroksiapatit (Ca₁₀(PO₄)₆(OH)₂) yapısının daha iyi elde edildiği belirlenmiş ve adsorpsiyon çalışmaları bu pH’ta hazırlanan malzeme ile gerçekleştirilmiştir. Hidroksiapatit ile RB203 adsorpsiyonuna pH (2-12), sorbent miktarı (2-10 g/L) ve boyar madde derişiminin (25-200 mg/L) etkisi incelenmiştir. Adsorpsiyon mekanizmasını belirleyebilmek için Langmuir, Freundlich, Temkin ve Henry izoterm eşitliklerinden yararlanılmıştır. Adsorpsiyon izoterm modelleri korelasyon katsayıları (R²) açısından karşılaştırıldığında, Langmuir, Freundlich ve Temkin izoterm modellerinin deney verileriyle uyum içinde olduğu görülmüştür. Langmuir izoterm modelinden elde edilen maksimum adsorpsiyon kapasitesi 27,93 mg/g olarak elde edilmiştir. Adsorpsiyon kinetiğini incelemek için Yalancı birinci ve ikinci derece kinetik eşitlikler kullanılmıştır. Adsorpsiyon kinetiği sonuçları RB203’ün hidroksiapatit ile adsorpsiyonunun Yalancı ikinci derece kinetik eşitlik ile daha iyi ifade edildiğini göstermektedir. Bu çalışma, atık kalsine yumurta kabuklarından sentezlenen hidroksiapatitin boyarmadde adsorpsiyonu için umut veren bir sorbent olabileceğini göstermiştir.

Anahtar Kelimeler

• Hidroksiapatit,yumurta kabuğu,adsorpsiyon,izoterm,kinetik

Kaynakça

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