Deniz UZUNOĞLU, Ayla ÖZER, Zeynep ÖZDEMİR

BASIC RED 46 BOYAR MADDESİNİN MONTMORİLLONİTLİ KİREÇ TAŞINA ADSORBSİYONU

Bu çalışmanın amacı, doğada bol bulunabilen kil minerallerinden montmorillonitli kireç taşı (MKT)’nın adsorbent olarak kullanımı ile tekstil endüstrisinde kullanılan ve atık sular ile alıcı sulara verilen Basic Red 46 boyar maddesi (BR 46)’nin giderimini araştırmaktır. BR 46’nin MKT’na adsorbsiyonunda optimum ortam koşulları başlangıç pH’sı 8.0, sıcaklık 25 oC ve adsorbent derişimi 1.0 g/L olarak belirlenmiş; çalışılan başlangıç BR 46 derişimi aralığında, adsorplanan miktarların derişim ile doğrusal olarak arttığı (qd=0.8*Co; R2=0.9965) gözlenmiştir. Deneysel denge verilerine Langmuir, Freundlich, Temkin ve Dubinin-Radushkevich izoterm modelleri uygulanmış; denge verilerinin Langmuir izoterm modeline daha iyi uyduğu sonucuna varılmıştır. MKT’nın BR 46’ni maksimum tek tabaka adsorplama kapasitesi 169.5 mg/g olarak belirlenmiştir. Deneysel kinetik veriler yalancı ikinci mertebe kinetik modeline uyum göstermiş; çalışılan adsorpsiyon prosesinde tanecik içi ve dışı difüzyonun etkili olduğu sonucuna varılmıştır. Entalpi, entropi ve Gibbs serbest enerji değişimi gibi termodinamik parametrelere göre çalışılan adsorpsiyon prosesinin ekzotermik ve istemli olduğu belirlenmiştir. MKT’nın adsorpsiyon öncesi ve sonrası FTIR, SEM ve EDX analizleri ile karakterizasyon çalışmaları gerçekleştirilmiştir.

Anahtar Kelimeler:

Adsorpsiyon, Basic Red 46, Montmorillonitli kireç taşı

THE ADSORPTION OF BASIC RED 46 ON THE NATURAL MINERAL LIMESTONE WITH MONTMORILLONITE

The purpose of this study is to investigate the applicability of the natural mineral limestone with montmorillonite as an adsorbent, and the removal of Basic Red 46 (BR 46) which is used textile industry and given to receiving waters with wastewaters. The optimum environmental conditions in the adsorption of BR 46 on MKT were determined as initial pH 8.0, temperature 25 oC and adsorbent concentration 1.0 g/L; it was observed that the adsorbed amounts increased linearly with concentration (qd=0.8*Co; R2=0.9965) in the studied initial concentration range. Langmuir, Freundlich, Temkin, Dubinin-Radushkevich isotherm models were applied to equilibrium data and it was concluded that the equilibrium data fitted better to Langmuir isotherm model. The maximum BR 46 adsorption capacity of MKT was determined as 169.5 mg/g. Experimental kinetic data fitted to the pseudo second order reaction kinetic, it was concluded that the intraparticle and external diffusion was effective in the studied adsorption process.

Keywords:

Adsorption, Basic Red 46, Limestone with montmorillonite,

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