Adsorption of Cd, Cu, Ni, Pb, and Zn on Sphagnum peat from solutions with low concentrations
Artikel i vetenskaplig tidskrift, 2007

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.

Freundlich isotherm

Sphagnum peat

Heavy metals

Adsorption

Författare

Yuliya Kalmykova

Chalmers, Bygg- och miljöteknik, Vatten Miljö Teknik

FRIST kompetenscentrum

Ann-Margret Hvitt Strömvall

Chalmers, Bygg- och miljöteknik, Vatten Miljö Teknik

FRIST kompetenscentrum

Britt-Marie Steenari

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Journal of Hazardous Materials

0304-3894 (ISSN)

152 885-891

Ämneskategorier

Kemi

DOI

10.1016/j.jhazmat.2007.07.062