Influence of pH and Ionic Strength on Cadmium Sorption by Some Biosorbents

Document Type : Research Paper


1 Assistant Professor, Faculty of Agriculture, University of Urmia

2 Former Graduate Student, Faculty of Agriculture, University of Urmia


To study the effect of pH and ionic strength on the sorption behavior of cadmium by
biosorbents, a batch experiment was conducted with various initial concentrations of Cd2+
(0 – 200 mg.L-1) with two biosorbents (sunflower stalks and apple pruning residues) in
two pH (4, 8) levels and two ionic strengths (0.1 and 0.03 M). Sorption data were fitted
to Langmuir, Temkin and Freundlich Equations. Results showed that both pH and ionic
strength (IS) had significantly affected Cd sorption. Langmuir maximum mono layer
adsorption (qmax) and binding energy value (KL) increased with increasing pH by two
biosorbents. Sorption coefficients of Freundlich (KF, n) and Temkin (KT , A) indicated
similar trends as well. But by increase in IS (from 0.03 to 0.1 M) all the sorption
parameters decreased significantly. As for the case of sunflower stalks; with increase in
ionic strength, qmax on the average, decreased from 8505 to 8150 mg/kg and KL from 0.14
to 0.08 L/mg; and as for apple pruning residues, qmax decreased from 7550 to 7300 mg/kg
and KL from 0.09 to 0.06 L/mg, respectively.


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