Simultaneous adsorption of Cd2+ , Ni2+ and Pb2+ on peat
DOI:
https://doi.org/10.15626/Eco-Tech.2003.030Keywords:
Heavy metals; adsorption, desorption, magnesium, calcium, inductively coupled plasma; peat, multi-elemental adsorptionAbstract
The aim of the present work was to investigate iflocally available untreated peat could be
used as filter material for the removal of heavy metals from leachate. The aqueous
solutions containing Cd2
+, Ni2+ and Pb2+ ions in single-metal and multi-metal solutions
were used to study the adsorption of metals on peat. The peat was obtained from
Southern Estonia. The decomposition rate of the peat was H6-H7 on the von Post scale.
In order to assess the adsorption mechanism, the amounts of Ca2+ and Mg2+ ions desorbed
from untreated peat were measured and compared to the adsorption efficiency of Cd2+
,
Ni2+ and Pb2+ ions from solution on the peat. The desorption of other cations, such as
Al3+
, K+
, Na+
, Fe3+
, Zn2+ etc. were negligible during all experiments. Adsorption batch
isotherm studies were carried out by using IO experimental series with the initial
concentration of 10 - 300 mg/I. The samples were analyzed by using the axial ICP-AES.
Results of the single- as well as multi-metal adsorptions show that peat can be effectively
used. Adsorption of metals on molar basis was found in the indicated order: Pb2+ > Cd2+
> Ni2+
. The removal of single metal ions from ternary-metal solution was less than its
removal from single-metal solution. However, the total adsorption capacity of metals
from multi-metal solution to peat increased. The Langmuir isotherm equation constants
were calculated and isotherms were drawn by using the program of calculating hyperbole
functions. Correlations for Ni2+ and Cd2+ with the Langmuir isotherm equation was found
to be good, whereas for Pb2+ the plot (amount absorbed vs. the equilibrium aqueous
concentration) was linear.
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References
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