Abstract
The use of versatile sorbents has been investigated for wastewater treatment. An investigation into the use of activated alumina-supported iron
oxide (denoted as FeAA), which is a by-product of the wastewater treatment plant. In our previous study, the FeAA has successfully been as
heterogeneous photoassisted Fenton catalyst for degradation azo dye at neutral pH 7.0. In this work, the test and use of FeAA as adsorbent for
the removal of lead (Pb2+) from water are carried out. The highest Pb2+ adsorption capacity was determined as 0.14 mmol g−1 for 0.8 mmol dm−3
initial Pb2+ concentration at pH 5.0 and 318 K. Adsorption data were well described by the Langmuir model and the thermodynamic constants of
the adsorption process: G◦, H◦ and S◦ were evaluated as −19.4 kJ mol−1 (at 318 K), 25.73 kJ mol−1 and 0.113 J mmol−1 K−1, respectively.
The pseudo-first-order and pseudo-second-order kinetic models were applied to test the experimental data. The pseudo-second-order kinetic model
provided the best correlation of the experimental data compared to the pseudo-first-order model.
© 2006 Elsevier B.V. All rights reserved.
Keywords: Adsorption; Lead; Thermodynamic; Kinetic; Iron oxide
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