Doğal pomza minerali ile Co(II) adsorpsiyon koşullarının optimizasyonu için cevap yüzey yönteminin uygulanması

Öz

Kobalt (Co) atık sularda bulunan en önemli ağır metallerden biridir. Kimyasal bazlı endüstrilerdeki atık sularda bulunan Co gibi bazı metaller yaşam biçimine toksik veya zararlı etkiye sahip olabilir. Bu nedenle çevresel tehlikeye neden olan atık sularda toksik metallerin giderilmesi önem arz etmektedir. Bu çalışmada; doğal pomza minerali ile sulu çözeltilerden Co(II) iyonunun adsorpsiyonla giderimi kesikli sistemde incelenmiştir. Merkezi kompozit tasarım (MKT) içeren cevap yüzey yöntemi (CYY)  pH, başlangıç Co(II) konsantrasyonu (Co) ve sıcaklık (T, °C) gibi adsorpsiyonu etkileyen önemli ortam koşullarını optimize etmek ve modellemek için bir cevap yüzeyi geliştirmek amacıyla başarılı bir şekilde uygulanmıştır. MKT’de deneysel sonuçların uyduğu quadratik modelden elde edilen model eşitliği ile optimum koşullar belirlenmiştir. Bu optimum koşullar pH 7.79, Co 69.84 mg/L ve sıcaklık 20 °C olarak bulunmuştur. Bu optimum koşullarda adsorpsiyon kapasitesi 2.816 mg/g ve adsorpsiyon yüzdesi ise %40.32 olarak hesaplanmıştır. Daha sonra program tarafından elde edilen bu bilgiler deneylerle doğrulanmıştır.

Anahtar Kelimeler

• Adsorpsiyon,Cevap yüzey yöntemi (CYY),Kobalt,Merkezi kompozit tasarım (MKT),Pomza

Application of response surface methodology for optimization of Co(II) adsorption conditions with natural pumice mineral

Abstract

Cobalt (Co) is one of the most important heavy metals found in the wastewaters. Some metals such as Co in wastewater from chemical-based industries can have toxic or harmful effects on life forms. Hence, removal of toxic metals in wastewater causing environmental hazards has a great importance. In this work, removal of Co(II) ions with adsorption from aqueous solutions by natural pumice has been investigated in a batch system. Response Surface Methodology (RSM) including the central composite design (CCD) was successfully applied to develop a response surface and optimize the medium conditions affecting significantly the adsorption such as pH, initial Co(II) concentration (Co) and temperature (T, °C). In CCD, optimum conditions were determined by the model equation obtained from the quadratic model fitting the experimental results. These optimum conditions were found to be 7.79, 69.84 mg/L and 20 °C for pH, Co and temperature, respectively. At these optimum conditions, the adsorption capacity and adsorption yield were calculated as 2.816 mg/g and 40.32%, respectively. Then, the data obtained by the program were confirmed by experiments.

Keywords

• Adsorption,Response surface methodology (RSM),Cobalt,Central composite design (CCD),Pumice

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