Nitrate removal from aqueous solutions with sodium alginate/quaternary branched polyethylenimine/carboxylated multi-wall carbon nanotube
Research Square (Research Square)(2023)
Abstract
Abstract One concern in recent years is increasing the amount of nitrate in drinking water. This study investigated nitrate adsorption using sodium alginate/quaternary branched polyethylenimine /carboxylated multi-wall carbon nanotube nanocomposite beads. The structure of nanocomposite beads was characterized with Field emission scanning electron microscopy images (FE-SEM), Energy dispersive X-ray mapping (EDX), X-ray diffraction spectroscopy (XRD), Fourier transform-infrared spectroscopy (FT-IR), and Thermogravimetric analysis (TGA). Several experiments were performed to optimize adsorption conditions, adsorption isotherms, kinetics, and reusability of the synthesized nanocomposite beads. Temkin and Freundlich isotherms, and the pseudo-first-order kinetic model, provided the best fit for the experimental adsorption data. Under optimal conditions, the nitrate removal efficiency was 72%. The results demonstrated that the introduced nanocomposite beads are pH-stable, have low-cost preparation, are recyclable at least for twelve adsorption-desorption cycles, and are safe.
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Key words
nitrate removal,branched polyethylenimine/carboxylated,sodium alginate/quaternary,aqueous solutions,carbon,multi-wall
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