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Nano-selenium functionalized zinc oxide nanorods: A superadsorbent for mercury (II) removal from waters
[Display omitted] •NanoSe@ZnO-NR were synthesized by reducing selenite with glutathione on the initially prepared ZnO-NR.•NanoSe@ZnO-NR showed a superior adsorption capacity, excellent distribution coefficient and fast kinetics.•The adsorption is pH independent and NanoSe@ZnO-NR showed high selectiv...
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Published in: | Journal of hazardous materials 2020-06, Vol.392, p.122495, Article 122495 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | [Display omitted]
•NanoSe@ZnO-NR were synthesized by reducing selenite with glutathione on the initially prepared ZnO-NR.•NanoSe@ZnO-NR showed a superior adsorption capacity, excellent distribution coefficient and fast kinetics.•The adsorption is pH independent and NanoSe@ZnO-NR showed high selectivity towards Hg.•The adsorption mechanism is due to strong interaction between Se and Hg(II) to form Se-Hg complex.•NanoSe@ZnO-NR can also adsorb other toxic metals such as Cd(II) and Pb(II).
In this study, nano selenium functionalized zinc oxide nanorods, NanoSe@ZnO-NR, was prepared, characterized and investigated for Hg(II) removal from waters of different types. The study results revealed that the material showed a superior adsorption capacity (qm, 1110 mg g–1) and excellent distribution coefficient (Kd, 9.11 × 108 mL g–1) which is two or more orders above most of the adsorbents reported in the literature. It should be also known that, 30 mg of the adsorbent can quickly reduce 10 mg L–1 Hg(II) to undetectable level from 10 mL of sample solution. The adsorption data were well explained with the pseudo-second order kinetic model and Langmuir adsorption isotherm model. Besides, the capturing capability of the material is independent on the pH change (2–12), selective against interfering cations, and exhibited fast kinetics (equilibrium time, ∼1 min). The NanoSe@ZnO-NR performance was also tested on real samples from different origin, surface waters (tap, lake and river) and wastewaters (effluent and influent), and complete removal and ≥99.2% removal efficiency was observed at 0.01 and 10 mg L–1 spiking levels, respectively. Therefore, NanoSe@ZnO-NR can be considered as a potential adsorbent in advancing the wastewater treatment technology. |
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ISSN: | 0304-3894 1873-3336 |
DOI: | 10.1016/j.jhazmat.2020.122495 |