Highly efficient removal of Sb(V) from water by franklinite-containing nano-FeZn composites

The existence of toxic and carcinogenic pentavalent antimony in water is a great safety problem. In order to remove antimony(V) from water, the purpose of this study was to prepare a novel graphene nano iron zinc (rGO/NZV-FeZn) photocatalyst via hydrothermal method followed by ultrasonication. Herein, weakly magnetic nano-Fe–Zn materials (NZV-FeZn, GACSP/NZV-FeZn, and rGO/NZV-FeZn) capable of rapid and efficient Sb(V) adsorption from water were prepared and characterised. In particular, rGO/NZV-FeZn was shown to comprise franklinite, Fe0, and graphite. Adsorption data were fitted by a quasi-second-order kinetic equation and Langmuir model, revealing that among these materials, NZV-FeZn exhibited the best Sb removal performance (543.9 mgSb gNZV-FeZn−1R2 = 0.951).

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Fig: (a) Yields of NZV-FeZn (1#), rGO/NZV-FeZn (2#), and GACsp/NZV-FeZn (3#) per unit mass. (b) Effects of auxiliaries on the efficiency of Sb(V) removal by rGO/NZV-FeZn. (c) Effect of pH on the efficiency of Sb(V) removal by rGO/NZV-FeZn. (d) Effects of illumination and oxygen on the efficiency of Sb(V) removal by rGO/NZV-FeZn.

In a practical decontamination test, Sb removal efficiency of 99.38% was obtained for a reaction column filled with 3.5 g of rGO/NZV-FeZn. Column regenerability was tested at an initial concentration of 0.8111 mgSb L−1, and the treated water obtained after five consecutive runs complied with the GB5749-2006 requirement for Sb. rGO/NZV-FeZn was suggested to remove Sb(V) through adsorption-photocatalytic reduction and flocculation sedimentation mechanisms and, in view of its high cost performance, stability, and upscalable synthesis, was concluded to hold great promise for source water and wastewater treatment.

Wu, H., Wu, Q., Zhang, J. et al. Highly efficient removal of Sb(V) from water by franklinite-containing nano-FeZn composites. Sci Rep 11,17113 (2021). https://doi.org/10.1038/s41598-021-95520-7

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