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

Yıl 2020, , 419 - 430, 25.10.2019

Müjgan Okur , Dilşad Dolunay Eslek Koyuncu

https://doi.org/10.17341/gazimmfd.474350

Cited By: 4

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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