The adsorption of copper ions onto beech sawdust | Adsorpcija jona bakra korišćenjem trine bukve
2011
Božić, D., Institut za rudarstvo i metalurgiju, Bor (Serbia) | Gorgievski, M., Institut za rudarstvo i metalurgiju, Bor (Serbia) | Stanković, V., Tehnički fakultet, Bor (Serbia) | Trujić, V., Tehnički fakultet, Bor (Serbia)
The paper presents the results of adsorption of copper ions from a synthetic solution onto sawdust as an adsorbent. Physical and chemical characterization of sawdust was performed and the content of alkali and alkaline earth metals in aqueous phase, before and after rinsing of sawdust with water, and after adsorption of sawdust with copper, was determined. Total oxygen demand (TOD) was determined volumetrically by means of KMnO4 solution and consumption of oxygen was 0.8 mg/L. Besides the TOD, the total cation exchange capacities of alkali and alkaline earth metals that are exchanged in the reaction with NH4Cl were also determined. The determined total cation exchange capacity (CEC) of the sawdust was 1.45 mmol Mez+/g sawdust. (Mez+ here denotes alkali and alkaline earth metal ions). The change of the initial pH value and the adsorption capacity with time was also determined. The maximum adsorption capacity evaluated from these results was 4.5 mg/g. The adsorption kinetics was relatively fast, reaching the equilibrium for less than 20 min. From the adsorption isotherms it was found that the adsorption equilibrium follows Langmuir adsorption model. The adsorption of copper ions on the sawdust occurs via an ion exchange mechanism. The results show that beech sawdust can be used as a cheap, natural adsorbent for the adsorption of copper ions from industrial effluents.
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