Volume 39 - Issue 3 - 257 - 264

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

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 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. 

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