Preparation an‎d characterization of magnetic nanocomposite of quantum dots on hydrogel substrate an‎d its use in lithium ion adsorption

9/3/2026 12:00:00 AM

In this study, a modified hydrogel was designed an‎d synthesized using polyvinyl alcohol (PVA), sodium alginate, magnetic graphene oxide functionalized with thermolytic anhydride (MGO-APTES-TA), thiourea-functionalized graphene oxide quantum dots (GO-QDs), calcium chloride, an‎d boric acid. This adsorbent was developed with the aim of removing lithium ion (Li⁺) from aqueous solutions, an‎d the effect of variables such as pH, temperature, adsorbent amount, an‎d contact time on its adsorption performance was investigated. The results showed that the ultimate adsorption capacity under optimal conditions (pH = 6, temperature 25 °C, initial concentration 35 mg/L, an‎d adsorbent amount 25 mg) was 30 mg/g. Kinetic analysis of the data showed that the adsorption process was consistent with pseudo-first order, an‎d thermodynamic analysis confirmed the endothermic an‎d spontaneous nature of the process. Based on these findings, the adsorption of lithium ions in this system has a combined nature of physical an‎d chemical adsorption. The present modified hydrogel with favorable performance in lithium ion removal has potential for application in water purification systems.

جذب سطحي , هيدروژل , گرافن اكسيد , نقاط كوانتومي , يون ليتيوم

adsorbtion , hydrogel , geraphen oxide , quantom dots , lithium ion

Amir ali Hadiyanjazi

dr. mohammad ghorban dekamin