Removal of Cd2+ metal ions from aqueous solutions by Na-alginate-containing composite biosorbent

This research is related to the effect of alginate-containing composite biosorbent on the sorption capacity of heavy metal $Cd^{2+}$ions. The study aims to determine the character and optimization of the sorption of Na-alginate-containing composite biosorbent on the sorption of heavy metal $Cd^{2+}$ metal ions in an aqueous solution. Optimum conditions of parameters such as biosorbent amount, pH value effect, concentration effect, contact time, and temperature that affect the sorption of $Cd^{2+}$ions were determined. Langmuir, Freundlich, D-R isotherms were applied to the obtained data, and it was noted that the sorption Cd2+ ions are better explained with Freundlich and D-R models. The thermodynamic parameters $(∆G^o , ∆H^o , ∆S3o ) for Cd^{2+}$ sorption onto composite biosorbent were also determined given from the temperature dependence. The results suggested that composite biosorbent is suitable as a sorbent material for recovery and sorption of metal ions from aqueous solutions.

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