%0 Journal Article %T Influence of pH and Ionic Strength on Cadmium Sorption by Some Biosorbents %J Iranian Journal of Soil and Water Research %I University of Tehran %Z 2008-479X %A Sepehr, Ebrahim %A Tosan, Amir %D 2015 %\ 03/21/2015 %V 46 %N 1 %P 133-140 %! Influence of pH and Ionic Strength on Cadmium Sorption by Some Biosorbents %K Cadmium %K Ionic strength %K pH %K biosorbents %K Adsorption isotherm %R 10.22059/ijswr.2015.54302 %X To study the effect of pH and ionic strength on the sorption behavior of cadmium bybiosorbents, 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) intwo pH (4, 8) levels and two ionic strengths (0.1 and 0.03 M). Sorption data were fittedto Langmuir, Temkin and Freundlich Equations. Results showed that both pH and ionicstrength (IS) had significantly affected Cd sorption. Langmuir maximum mono layeradsorption (qmax) and binding energy value (KL) increased with increasing pH by twobiosorbents. Sorption coefficients of Freundlich (KF, n) and Temkin (KT , A) indicatedsimilar trends as well. But by increase in IS (from 0.03 to 0.1 M) all the sorptionparameters decreased significantly. As for the case of sunflower stalks; with increase inionic strength, qmax on the average, decreased from 8505 to 8150 mg/kg and KL from 0.14to 0.08 L/mg; and as for apple pruning residues, qmax decreased from 7550 to 7300 mg/kgand KL from 0.09 to 0.06 L/mg, respectively. %U https://ijswr.ut.ac.ir/article_54302_03b02aa131b7abee00a191ec03e555ed.pdf