Document Type : Original Article


1 University of Prishtina, 10000 Prishtinë, Republic of Kosovo

2 Academy of Arts and Sciences of Kosova, 10000 Prishtina, Republic of Kosova



Wheat bran without any chemical treatment was used as biosorbent for sorption of cadmium ions from aqueous solution. The structure of biosorbent was characterized by ATR-IR spectra and pH of the point zero charge (pHPZC). The effect of initial metal concentration, biosorbent dose, contact time, temperature, initial solution, pH, on biosorption of Cd(II) ion from aqueous solution into wheat bran were determined. The best results were achieved at contact time 30 min at pH 5.5 and temperature 25oC. We used Freundlich and Langmuir isotherms to characterize the adsorption equilibrium. The biosorption of cadmium ions fits well with the Langmuir and Freundlich isotherms, according to experimental data (R2 0.996 and R2 0.995, respectively). The maximum biosorption capacity of cadmium ions with the Langmuir model for wheat bran is qmax= 6.25 mg/g, at optimal conditions. Thermodynamic parameters (ΔHo, ΔSo and ΔGo) showed that the exothermic, spontaneous and favourable biosorption process. These results predict that wheat bran can be used for uptake of cadmium ions from aqueous solution.


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