Ulgar GÜVENÇ, Sibel ÜREN, Yekta GÖKSUNGUR

Biosorption of copper lons by caustic treated waste Baker's yeast biomass

Kostikle Muamele Edilmiş Atık Ekmek Mayası Hücrelerine Bakır İyonlarının Biyosorpsiyonu Özet: Bu çalışmada atık ekmek mayası (Saccharomyces cerevisiae) hücreleri $Cu^{+2}$ geri kazanımı için biyosorbant olarak kullanılmıştır. Maya hücreleri NaOH, etil alkol ve ısı ile muamele edilerek biyosorpsiyon kapasiteleri artırılmaya çalışılmış ve bu yöntemler arasında en yüksek bakır kazanımı (21.1 mg $g^{-1}$) ile kostikle muamele edilmiş ekmek mayası hücrelerinden elde edilmiştir. Kostikle muamele edilmiş maya hücreleri ile başlangıç $Cu^{+2}$ konsantrasyonu ve pH'nın biyosorpsiyon üzerine etkisi incelenmiştir. En yüksek $Cu^{+2}$ kazanımı (120.7 mg $g^{-1}$) pH 4.0'da, 198.2 mg $l^{-1}$ başlangıç bakır iyonu konsantrasyonunda elde edilmiştir. Langmuir modeli ve Freundlich denkliği deneysel verilere uygulanmış ve Langmuir modelinin deneysel verilerle daha iyi korelasyon içerisinde olduğu belirlenmiştir. Langmuir sabitleri olan $q_{max}$ (mg $g^{-1}$) ve b (1 $mg^{-1}$) sırasıyla 181.8 ve 0.0312 olarak belirlenmiştir. Kostikle muamele edilmiş maya hücreleri kalsiyum a[jinat jelinde tutuklanmış ve dolgulu yatak kolonda yapılan denemelerde gerçek biyosorpsiyon kapasitesinin aljinat jelinden kaynaklandığı, immobilize maya hücrelerinin ise jelin biyosorpsiyon kapasitesini sadece bir miktar artırdığı belirlenmiştir.

Kostikle muamele edilmiş atık ekmek mayası hücrelerine bakır iyonlarının biyosorpsiyonu

Waste baker's yeast (Saccharomyces cerevisiae) was used as a biosorbent for $Cu^{+2}$biosorption. The yeast cells were treated with caustic soda, ethanol and heat to increase their biosorption capacity. Among the treatment methods used, the highest copper uptake (21.1 mg $g^{-1}$) was obtained with the caustic treatment of baker's yeast. The effect of initial copper concentration and pH on biosorption for caustic treated yeast was studied. The highest $Cu^{+2}$ uptake ( 120.7 mg $g^{-1}$ ) was obtained at pH 4.0, for 198.2 mg $I^{-1}$ initial copper ion concentration. The Langmuir model and Freundlich equation were applied to the experimental data and the Langmuir model was found to be in better correlation with the experimental data. The Langmuir constants were qmax (mg $g^{-1}$) = 181.8 and b (1 $mg^{-1}$) = 0.0312. In packed bed column studies with calcium alginate immobilized caustic treated yeast, it was found that the real biosorption capacity came from the alginate gel and immobilizing caustic treated yeast particles in the gel only slightly increased the biosorption capacity of the gel.

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