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

Abstract

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.    

Keywords

• Adsorption,Adsorbent,Kinetics,İsotherm,Thermodynamics

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

Abstract

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.    

Keywords

• Adsorbent,Adsorpsiyon,Kinetik,İzoterm,Termodinamik

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