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Adsorption of Cd, Cu, Ni, Pb, and Zn on Sphagnum peat from solutions with low concentrations

Yuliya Kalmykova (Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik ; FRIST kompetenscentrum ) ; Ann-Margret Strömvall (Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik ; FRIST kompetenscentrum ) ; Britt-Marie Steenari (Institutionen för kemi- och bioteknik, Oorganisk miljökemi)
Journal of Hazardous Materials 152, p. 885-891. (2007)
[Artikel, refereegranskad vetenskaplig]

This work investigates adsorption of metal ions on Sphagnum peat from solutions with environmentally relevant concentrations of metals. The peat moss is intended as an alternative, low-cost filter material for contaminated waters. Adsorption of Cd, Cu, Ni, Pb and Zn was studied in batch tests, and adsorption isotherms were determined. The kinetics of adsorption was analyzed using a second-order model and rate constants were calculated. An empirical model for predicting adsorption of metal ions at a given time was derived from these constants. Metal ions were removed in the descending order Pb > Cu > Ni > Cd > Zn. Relationship between the affinities of the metals to the peat active sites with chemical properties for the metals were indicated by the results. In addition, equilibration studies were performed at constant pH and ionic strength. The experimental data fitted the Freundlich equation. Both the uptake of metals and the Freundlich constants increased in line with increasing pH. The Freundlich exponent declined with higher initial concentrations, suggesting adsorption to sites with lower activity.

Nyckelord: Adsorption, Heavy metals, Sphagnum peat, Freundlich isotherm


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Denna post skapades 2008-03-20. Senast ändrad 2015-06-12.
CPL Pubid: 69441

 

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Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik
FRIST kompetenscentrum
Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)

Ämnesområden

Kemi

Chalmers infrastruktur

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