Investigation of Dye Removal With Adsorbent Obtained by Applying Physicochemical Processes to Lignite Coals in Egirdir Region

Yıl 2019, , 218 - 237, 01.04.2019

Saadet Acar , Mehmet Kılıç

https://doi.org/10.19113/sdufenbed.485102

Öz

In this
study, the ability of methylene blue dyestuff to be removed from aqueous
solutions by easy-to-find, low-cost and effective materials was investigated.
For this purpose, lignite coals in Eğirdir region were used as adsorbent.
Experimental work was carried out with raw charcoal, treated charcoal with ZnCl₂
and charcoal prepared with ZnCl₂+sonic wave treatment. Adsorption in
work; the effects of mixing speed, pH values, contact time, adsorbent doses and
doses with temperature were investigated. The equilibrium data are adapted to
Langmuir and Freundlich isotherms. Accordingly, it has been determined that
isotherm data are more suitable for the Langmuir model. Adsorption kinetics
were found to be consistent with the pseudo-II reaction kinetics model. By evaluating
various thermodynamic parameters such as standard enthalpy, entropy and Gibbs
free energy change, it has been found that adsorption is feasible, spontaneous
and endothermic. It has been observed that ZnCl₂ and sonic wave are
effective in adsorbent preparation processes. The prepared adsorbents were characterized by SEM images, FTIR
spectroscopy and BET surface area analysis. The results of the study showed
that the adsorbent prepared are suitable adsorbents for the removal of
methylene blue dye material. The results obtained were compared with the
results of previous studies and contributions were made for adsorption studies.    

Anahtar Kelimeler

Adsorption, Adsorbent, Kinetics, İsotherm, Thermodynamics

Eğirdir Yöresinde Bulunan Linyit Kömürlerine Fizikokimyasal İşlemler Uygulanarak Elde Edilen Adsorbent ile Boyar Madde Gideriminin Araştırılması

Öz

Bu
çalışmada metilen mavisi boyar maddesinin sulu çözeltilerden kolay bulunabilir,
az maliyetli ve etkili malzemeler kullanılarak uzaklaştırılabilirliği
araştırılmıştır. Bu amaçla adsorbent olarak, Eğirdir yöresinde bulunan linyit
kömürleri kullanılmıştır. Deneysel çalışmalar ham kömür, ZnCl₂ ile muamele
edilen kömür ve ZnCl₂+sonik dalga ile muamele sonucu hazırlanan
kömürlerle gerçekleştirilmiştir. Çalışmada adsorpsiyona; karıştırma hızının, pH
değerlerinin, temas süresinin, adsorban dozlarının ve dozların sıcaklık ile
değişiminin etkileri araştırılmıştır. Denge verileri Langmuir ve Freundlich
izotermlerine uyarlanmıştır. Buna göre izoterm verilerinin Langmuir modeline
daha fazla uygun olduğu belirlenmiştir. Adsorpsiyon kinetiğinin ise Pseudo II.
derece reaksiyon kinetik modeline uygunluk gösterdiği saptanmıştır. Standart
entalpi, entropi ve Gibbs serbest enerjisi değişimi gibi çeşitli termodinamik
parametreler değerlendirilerek, adsorpsiyonunun uygulanabilir, kendiliğinden
olan ve endotermik olduğu tespit edilmiştir. Adsorbent hazırlama işlemlerinde
ZnCl₂ ve sonik dalganın etkili olduğu gözlemlenmiştir. Hazırlanan
adsorbentler SEM görüntüleri, FTIR spektroskopisi ve BET yüzey alanı analizleri
ile karakterize edilmiştir. Araştırmanın sonuçları hazırlanan adsorbent ile
metilen mavisi boyar maddesinin giderimi için uygun bir adsorban olduğunu
göstermiştir. Elde edilen sonuçlar daha önce yapılan benzer çalışmaların
sonuçları ile karşılaştırılarak, adsorpsiyon araştırmalarına yönelik katkılarda
bulunulmuştur.    

Anahtar Kelimeler

Adsorbent, Adsorpsiyon, Kinetik, İzoterm, Termodinamik

Kaynakça

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