Ayhan Abdullah CEYHAN, Orhan BAYTAR, Ömer ŞAHİN

İğde Çekirdeğinden Elde Edilen Aktif Karbon Kullanılarak Sulu Çözeltilerden Pb(II) Adsorpsiyonun İncelenmesi: İzoterm ve Kinetik

Bu çalışmada, önceki çalışmamızda ZnCI2 aktifleştiricisi kullanılarak kimyasal aktivasyon yöntemi ile iğdeçekirdeğinden elde edilen 1836 m2/g BET yüzey alanına sahip aktif karbon kullanılarak sulu çözeltilerden Pb(II)adsorpsiyonu incelenmiştir. Bu amaçla, çözelti pH’ı, aktif karbon miktarı, çözelti başlangıç derişimi ve işlemsıcaklığı parametrelerinin Pb(II) adsorpsiyonuna etkileri ayrı ayrı incelenmiştir. Artan sıcaklık ve aktif karbonmiktarı ile Pb(II) giderim yüzdesinin arttığı belirlenmiştir. Adsorpsiyon denge verilerinin Langmuir izotermineuyduğu tespit edilmiş olup, maksimum adsorpsiyon kapasitesi (qmaks) çözelti başlangıç pH değeri pH=4’de 86,207mg.g-1 olarak bulunmuştur. Sulu çözeltiden Pb(II) adsorpsiyon kinetiğinin Elovich kinetik model ile uyumluolduğu tespit edilmiştir. Partikül içi difüzyon modeli sonuçlarına göre adsorpsiyon işleminin birden fazlabasamakta gerçekleştiği ve difüzyonu kontrol eden basamağın en küçük difüzyon katsayısına (1,455) sahip olan3. basamak olduğu belirlenmiştir

Investigation of Pb (II) Adsorption From Aqueous Solutions Using Activated Carbon Obtained From Elaeagnus Seed: Isotherm and Kinetic

In our previous study, activated carbon with a BET surface area of 1836 m2 / g was obtained by the chemical activation method from elaeagnus seed. ZnCl2was used as a activator in the synthesis of actived carbon. In this study, Pb (II) adsorption from aqueous solutions was investigated using this activated carbon. For this purpose, the effects of some parameters such as solution pH, amount of activated carbon, solution initial concentration and treatment temperature Pb (II) adsorption were separately investigated. It was determined that the percentage of Pb (II) removal increases with increasing temperature and amount of activated carbon. It was found that adsorption equilibrium data are consistent with Langmuir isotherm. Thus, the maximum adsorption capacity (qmax) was found as 86.207 mg.g-1 at pH = 4. The adsorption kinetics of the aqueous solution Pb (II) were found to be consistent with the Elovich kinetic model. According to the results of the particle diffusion model, it was determined that the adsorption process is performed in more than one step and the third step has the smallest diffusion coefficient (1,455) of the diffusion controlling step.

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