Abstract
In excess, cobalt and lead ions adversely affect both the environment and ecosystems, having negative impact on agricultural plants and feed cultures as well as fish, animal, and human health. In this study, a three-component sorbent based on carbon dots (CDs), hydroxypropyl methyl cellulose (HPMC), and silica (SiO2) was developed for the removal of cobalt(II) and lead(II) ions from aqueous media. CDs synthesized directly on the HPMC surface were condensed with SiO2 via the hydrolysis of tetraethyl siloxane. As a result, a recyclable porous CD/HPMC/SiO2 nanosorbent with high sorption capacity was synthesized. The CD/HPMC/SiO2 nanosorbent has an adsorption capacity of 258 ± 4 mg/g and 168 ± 6 mg/g for lead(II) and cobalt(II), respectively. The material also displayed adequate cyclability as Co2+ and Pb2+ ions were easily removed from the sorbent surface.
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