Adsorption of Lead on to Poly acrylamide- maleic acid -Based Hydrogel Composites

Yıl 2011, Cilt: 39 Sayı: 3, 257 - 264, 01.08.2011

Recep Akkaya Ulvi Ulusoy

Öz

In this study, adsorptive features of the hydrogel PAA-MA and composites PAA-MA-B and PAA-MA-Z were investigated for lead Pb2+ . Adsorption of lead on hydrogels and composites is studied by batch adsorption tecnique at 25ºC. In the experiments of the adsorption, the classical Lagmuir, Freundlich and Dubinin-Radushkevich DR models sorption models were fitted to the results. Isotherms were L and H type of Giles classification and evaluated with reference to Langmuir, Freundlich and Dubinin-Radushkevich DR models. PAA-MA-B had higher adsorption capacity than PAA-MA-Z for lead ion. To increase the adsorption capacity of Pb2+ ion preparing the PAA- MA hydrogel. It has also been observed with increasing B and Z content Pb2+ ion adsorption. The values of enthalpy and entropy changed were positive for lead ions for PAA-MA, PAA-MA-B and PAA-MA-Z. The negative free enthalpy change value indicated that the adsorption process is spontaneous in the sequence of PAA-MA > PAA-MA-B > PAA- MA-Z. Free energy values derived from DR model implied that the sorption process is the ion exchange. The reus- ability tests for Pb2+ for five uses proved that the composites were reusable after complete recovery of the loaded.

Anahtar Kelimeler

Polyacrylamide-maleic acid PAA-MA, polyacrylamide-maleic acid-bentonite PAA-MA-B, polyacrylamide-maleic acid-zeolite PAA-MA-Z, lead, Adsorption, Hydrogel, composites

Poli Akrilamid-Maleik Asit Temelli Hidrojel Kompozitlere Kurşun Adsorpsiyonu

Öz

B u çalışmada, poliakrilamid-maleik asit hidrojel PAA-MA ve kompozitlerine PAA-MA-B ve PAA-MA-Z kurşun adsorpsiyonu araştırıldı. Adsorpsiyon 25oC’lik kesikli sistemde çalışıldı. Deneysel izotermlerin Langmuir, Freundlich ve Dubinin-Radushkevich modellerine uyumundan türetilen parametreler bu ilgiyi kanıtlamıştır. Adsorpsiyonun derişimle değişiminin incelenmesi sonucu elde edilen izotermlerin tümünün Giles sınıflandırmasındaki L veya H tipte olduğu görülmüştür. PAA-MA-B kompoziti PAA-MA-Z kompozitinden daha iyi adsorpsiyon kapasitesine sahip olduğu görülmüştür. Adsorpsiyon kapasitesi hidrojeldeki B ve Z bileşenlerinin artması ile artış göstermektedir.Adsorpsiyon entalpi ve entropi değişim değerleri, adsorpsiyonun, araştırması yapılan tüm adsorbanlar için pozitif değerlidir. Serbest entalpi ΔG değerleri ise adsorpsiyon sürecinin beklenildiği gibi kendiliğinden yürüdüğünü göstermiştir PAA-MA > PAA-MA-B > PAA-MA-Z . DR modelinden türetilen serbest enerji açısından da tüm adsorbanlar için kimyasal olduğunu kanıtlamıştır. Kompozitlerin yeniden kullanılabilirlikleri ile ilgili sonuçlar tekrar kullanılabilir olduğunu göstermiştir

Anahtar Kelimeler

Poliakrilamid-maleikasit PAA-MA, poliakrilamid-maleikasit-bentonite PAA-MA-B, poliakrilamid-maleikasitzeolite PAA-MA-Z, kurşun, adsorpsiyon, hidrojel, kompozit

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