Characteristics of sorption of uncomplexed and complexed Pb(II) from aqueous solutions onto peat
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Laura Bulgariu
,
Dumitru Bulgariu
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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© 2012 Institute of Chemistry, Slovak Academy of Sciences
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Artikel in diesem Heft
- Characteristics of sorption of uncomplexed and complexed Pb(II) from aqueous solutions onto peat
- Utilisation of industrial waste for ferrite pigments production
- Determination of anti-oxidant capacity and content of phenols, phenolic acids, and flavonols in Indian and European gooseberry
- Photodynamic efficiency of porphyrins encapsulated in polysilsesquioxanes
- Hydrothermal synthesis of momordica-like CuO nanostructures using egg white and their characterisation
- Synthesis, anti-oxidant activity, and cytotoxicity of salicyloyl derivatives of estra-1,3,5(10)-triene and androst-5-ene
- Formation of dioxospiroindene[1,3]thiazine and thioxoindeno[2,1-d]imidazolone derivatives from alkenylidene-hydrazinecarbothioamides
- N-alkylation of ethylenediamine with alcohols catalyzed by CuO-NiO/γ-Al2O3
- Selective synthesis of E-isomers of aldoximes via a domino aza-Michael/retro-Michael reaction
- Selective anomeric deacetylation using zinc acetate as catalyst
- Solubility of methane in octane + ethanol at temperatures from 303.15 K to 333.15 K and pressures up to 12.01 MPa
