Removal of hexavalent chromium from aqueous solutions using Ni–SiO$$_{2}$$ nanomaterials

Autor: Abdullah M. Asiri, Ekram Y. Danish, Esraa M. Bakhsh, Hadi M. Marwani, Sher Bahadar Khan, Kholoud F. Almoslehi
Rok vydání: 2019
Předmět:
Zdroj: Bulletin of Materials Science. 42
ISSN: 0973-7669
0250-4707
Popis: This study describes an effective method developed for the removal of hexavalent chromium, Cr(VI), from an aqueous environment. In this study, the Ni– $$\hbox {SiO}_{{2}}$$ nanomaterial was synthesized by the sol–gel method and then characterized by field emission scanning electron microscopy, X-ray diffraction and energy dispersive X-ray spectroscopy. The prepared nanomaterial was then employed as an adsorbent with significant properties of high surface area and uptake capacity. Adsorption conditions of Cr(VI) onto the Ni– $$\hbox {SiO}_{{2}}$$ nanomaterial were optimized by altering different parameters (pH, initial Cr(VI) concentration and different periods of time). An amount of 100.75 mg $$\hbox {g}^{-1}$$ was estimated as the maximum uptake capacity of the Ni– $$\hbox {SiO}_{{2}}$$ nanomaterial at pH 4.0. The experimental data of Cr(VI) adsorption onto the Ni– $$\hbox {SiO}_{{2}}$$ nanomaterial were fitted well to the Langmuir isotherm and pseudo second-order kinetic models. Moreover, the adsorption of Cr(VI) onto the Ni– $$\hbox {SiO}_{{2}}$$ nanomaterial was not influenced even in the presence of different coexisting ions. Finally, the recommended methodology was applied on several environmental water samples.
Databáze: OpenAIRE
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