Abstract

Ruthenium possesses outstanding properties and is widely utilized in many fields. However, its natural scarcity makes the recovery of ruthenium from waste liquids particularly important. A dendrimer-grafted chitosan adsorbent is synthesized through Michael addition and amidation reactions on chitosan, which is then used to adsorb Ru(III) from aqueous solutions. Compared with unmodified chitosan, this adsorbent has abundant binding sites and can rapidly and efficiently adsorb Ru(III) through electrostatic attraction and complexation. Characterization techniques, including FT-IR, XPS, and SEM, confirmed successful modification. Adsorption experiments show that this adsorbent exhibits an adsorption efficiency of up to 97.79% for Ru(III) and saturated adsorption capacity of 162 mg/g. The results of competitive adsorption experiments demonstrate that the adsorbent has good selectivity for Ru(III), retaining 71.22% of adsorption efficiency after five cycles. This work offers a new possibility for the environmentally friendly and efficient recovery of Ru(III) from wastewater.

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