Adsorptive features of polyacrylamide-apatite composite for Pb super(2) super(+), UO sub(2) super(2) super(+) and Th super(4) super(+)

Micro-composite of polyacrylamide (PAA) and apatite (Apt) was prepared by direct polymerization of acrylamide in a suspension of Apt and characterized by means of FT-IR, XRD, SEM and BET analysis. The adsorptive features of PAA-Apt and Apt were then investigated for Pb super(2) super(+), UO sub(2) s...

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Bibliographic Details
Published in:Journal of hazardous materials 2009-04, Vol.163 (1), p.98-108
Main Authors: Ulusoy, U, Akkaya, R
Format: Article
Language:English
Online Access:Get full text
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Summary:Micro-composite of polyacrylamide (PAA) and apatite (Apt) was prepared by direct polymerization of acrylamide in a suspension of Apt and characterized by means of FT-IR, XRD, SEM and BET analysis. The adsorptive features of PAA-Apt and Apt were then investigated for Pb super(2) super(+), UO sub(2) super(2) super(+) and Th super(4) super(+) in view of dependency on ion concentration, temperature, kinetics, ion selectivity and reusability. Experimentally obtained isotherms were evaluated with reference to Langmuir, Freundlich and Dubinin-Radushkevich (DR) models. Apt in PAA-Apt had higher adsorption capacity (0.81, 1.27 and 0.69molkg super(-) super(1)) than bare Apt (0.28, 0.41 and 1.33molkg super(-) super(1)) for Pb super(2) super(+) and Th super(4) super(+), but not for UO sub(2) super(2) super(+). The affinity to PAA-Apt increased for Pb super(2) super(+) and UO sub(2) super(2) super(+) but not changed for Th super(4) super(+). The values of enthalpy and entropy changed were positive for all ions for both Apt and PAA-Apt. Free enthalpy change was G
ISSN:0304-3894
DOI:10.1016/j.jhazmat.2008.06.064