Characteristics of sorption of uncomplexed and complexed Pb(II) from aqueous solutions onto peat |
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Authors: | Email author" target="_blank">Laura?BulgariuEmail author Dumitru?Bulgariu Matei?Macoveanu |
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Institution: | 1.Department of Environmental Engineering and Management, Faculty of Chemical Engineering and Environmental Protection,Technical University Gheorghe Asachi of Iasi,Iasi,Romania;2.Department of Geology and Geochemistry, Faculty of Geography and Geology,“Al. I. Cuza” University of Iasi,Iasi,Romania;3.Collective of Geography,Romanian Academy, Filial of Iasi,Iasi,Romania |
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Abstract: | Batch experiments aimed at the sorption of Pb(II) onto peat were performed from an aqueous solution in both the absence and
presence of common complexing agents (acetate or citrate). The influence of the initial pH of the solution, metal ion concentration
and contact time on the sorption efficiency of Pb(II) was examined at ambient temperature (18 ± 0.5) °C for each experiment.
The results showed that the presence of acetate improved the efficiency of the sorption process, while the presence of citrate
in the aqueous solution decreased the efficiency of the Pb(II) sorption onto peat. The equilibrium data fitted well with the
Langmuir isotherm model and confirmed the monolayer sorption of uncomplexed and complexed Pb(II) species onto peat. The values
of maximum sorption capacities (q
max) were 135.13 mg g−1 for Pb(II) complexed with acetate, q > 79.36 mg g−1 for uncomplexed Pb, q > 38.46 mg g−1 for Pb(II) complexed with citrate. The kinetics of Pb(II) sorption onto peat, in both the absence and presence of complexing
agents, indicated a pseudosecond order mechanism. Analysis of IR spectra showed that carboxylic and hydroxyl groups had an
important role in the binding process of Pb(II) species onto peat. |
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Keywords: | |
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