1. Adsorption-coupled Fenton type reduction of bromate in water by high-yield polymer-derived ceramic-supported nano-zerovalent iron.
- Author
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Idrees M, Batool S, Rasheed H, Herath I, Bundschuh J, Niazi NK, Ahmad M, Xu J, and Chen D
- Subjects
- Adsorption, Water Purification methods, Hydrogen Peroxide chemistry, Polymers chemistry, Oxidation-Reduction, Metal Nanoparticles chemistry, Iron chemistry, Water Pollutants, Chemical chemistry, Ceramics chemistry, Bromates chemistry
- Abstract
Nano-zerovalent iron (nZVI) is a promising material for the removal of both organic and inorganic pollutants from contaminated water. This study investigates the potential of a novel composite of nZVI on a polymer-derived supporting ceramic (nZVI-PDC) synthesized via the liquid-phase reduction method for the simultaneous adsorption and Fenton-type reduction of bromate anion (BrO
3 - ) in water. The nZVI nanoparticles were effectively anchored onto the PDC by impregnating high-yield carbon in a ferrous sulfate solution. The PDC facilitated the uniform dispersion of nZVI nanoparticles due to its multiple active sites distributed within mesocarbon cavities. The developed nZVI-PDC composite exhibited a high specific surface area of 837 m2 g-1 and an ordered mesoporous structure with a pore volume of 0.37 cm3 g-1 . As an adsorbent, the nZVI-PDC composite exhibited a maximum adsorption capacity (qe ) of 842 mg g-1 and a partition coefficient (KH ) of 10.2 mg g-1 μM-1 , as calculated by the pseudo-second-order model. As a catalyst, the composite demonstrated a reaction kinetic rate of 43.5 μmol g-1 h-1 within 6 h at pH 4, using a dosage of 60 mg L-1 nZVI-PDC and a concentration of 0.8 mmol L-1 H2 O2 . Comparatively, PDC exhibited a qe of 408 mg g-1 , KH of 1.67 mg g-1 μM-1 , and a reaction rate of 20.8 μmol g-1 h-1 , while nZVI showed a qe of 456 mg g-1 , KH of 2.30 mg g-1 μM-1 , and a reaction rate of 27.2 μmol g-1 h-1 . The modelling indicated that the nZVI-PDC composite followed pseudo-second-order kinetics. The remarkable removal efficiency of the nZVI-PDC composite was attributed to the synergistic effects between PDC and nZVI, where PDC facilitated charge transfer, promoting Fe2+ generation and the Fe3+ /Fe2+ cycle. Overall, this work introduces a promising adsorption technology for the efficient removal of BrO3 - from contaminated aqueous solutions, highlighting the significant potential of the nZVI-PDC composite in water purification applications., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Inc. All rights reserved.)- Published
- 2024
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