Synthesis, characterization, and application of Fe-CNTs nanocomposite for BrO3− remediation from water samples

• Fe/MWCNTs based nanocomposite was synthesized.
• BrO3− remediation from synthetic and commercial water samples was studied.
• Fe nanoparticles were actively involved in BrO3− adsorption.
• 65–85% BrO3− adsorption at various concentrations was accomplished in 5 min.
• BrO3− was not detected in treated bottled water samples.

Iron hydr(oxide) based multi-walled nanotubes (Fe-CNTs) nanocomposite was synthesized, and its adsorptive potential for BrO3− removal from synthetic and commercially available bottled water samples was tested. Residual BrO3− concentration was determined using ultra-performance liquid chromatography-tandem mass. Spectroscopic and morphological studies revealed that anchored Fe ions on the nanocomposites surface/in the walls were responsible for BrO3− adsorption without causing structural defects to CNTs. Rapid adsorption kinetics was observed, accomplishing 65–85% adsorption at varied concentrations in 5 minutes. Elution study showed optimum BrO3− recovery with 0.1 M HCl. Bottled water samples treatment with Fe-CNTs nanocomposite showed residual BrO3− concentration below instrumental detection limit.

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