Adsorption of lead on to poly(Acrylamide-maleic acid)-Based hydrogel composites

Bu çalışmada, poliakrilamid-maleik asit hidrojel (PAA-MA) ve kompozitlerine (PAA-MA-B ve PAA-MA-Z) kurşun adsorpsiyonu araştırıldı. Adsorpsiyon 25 oC’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 (G) 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. The reusability tests for Pb2+ for five uses proved that the composites were reusable after complete recovery of the loaded. Kompozitlerin yeniden kullanılabilirlikleri ile ilgili sonuçlar tekrar kullanılabilir olduğunu göstermiştir.

Poli(Akrilamid-maleik asit) temelli hidrojel kompozitlere kurşun adsorpsiyonu

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 hydrogel 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 ion 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 reusability tests for Pb2+ for five uses proved that the composites were reusable after complete recovery of the loaded.

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