Journal
MOLECULES
Volume 27, Issue 16, Pages -Publisher
MDPI
DOI: 10.3390/molecules27165168
Keywords
heavy metals; adsorption; silica functionalization
Funding
- Deanship of Scientific Research at King Saud University [RGP-070]
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In this study, a highly efficient and selective silica-based adsorbent was developed for the removal of Cu(II) ions from aqueous solutions. The adsorbent showed excellent selectivity and high adsorption capacity, outperforming other similar adsorbents currently published. The adsorption mechanism, thermodynamics, reusability, and the effects of various experimental conditions were investigated. Theoretical studies were also conducted to understand the adsorption mechanism and the nature of the bonds formed.
In this study, we will present an efficient and selective adsorbent for the removal of Cu(II) ions from aqueous solutions. The silica-based adsorbent is functionalized by 2-phenylimidazo[1,2-a] pyridine-3-carbaldehyde (SiN-imd-py) and the characterization was carried out by applying various techniques including FT-IR, SEM, TGA and elemental analysis. The SiN-imd-py adsorbent shows a good selectivity and high adsorption capacity towards Cu(II) and reached 100 mg/g at pH = 6 and T = 25 degrees C. This adsorption capacity is important compared to other similar adsorbents which are currently published. The adsorption mechanism, thermodynamics, reusability and the effect of different experimental conditions, such as contact time, pH and temperature, on the adsorption process, were also investigated. In addition, a theoretical study was carried out to understand the adsorption mechanism and the active sites of the adsorbent, as well as the stability of the complex formed and the nature of the bonds.
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