Morphology selective construction of β-cyclodextrin functionalized Fe₃O₄-Bi₂WO₆ nanocomposite with superior adsorptivity and visible-light-driven catalytic activity

Abstract

Controlled growth of Bi₂WO₆ nanorods with exposed [0 0 1] facets and the fabrication of an Fe₃O₄-Bi₂WO₆ magnetic composite by a microwave-assisted polyol process, were achieved in this study. The adsorptivity and photocatalytic performance of the composite toward sunset yellow dye degradation were greatly enhanced by the β-cyclodextrin cavities on its surface, firmly anchored through a cetyltrimethylammonium bromide linkage. A series of examinations and characterizations were carried out to determine the influence of various factors on the morphological modulation-photocatalytic behavior of the pure Bi₂WO₆ prior to final functionalization. Changing the pH of the precursor solution impacted the formation of 0D, 2D, and 3D structures; however, the presence of hexamethylenetetramine surfactant induced the development of 1D nanorod structure. A reasonable crystal growth mechanism was proposed to elucidate the formation process. Conversely, the mechanism of the activity enhancement of β-cyclodextrin functionalized Fe₃O₄-Bi₂WO₆, compared to that of the non-functionalized samples, could be realized with the assistance of chemical trapping experiments on sunset yellow, and was confirmed on the colorless antibiotic (sulfamethoxazole). The high performance and durability of this composite can be attributed to the facet-dependent activity, large adsorption capacity due to inclusion interactions, enhanced visible light absorption, and efficient charge separation.

Graphical abstract

Keywords

β-cyclodextrin / Bi₂WO₆ / shape controlled / nanorod / sunset yellow

References

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Acknowledgment

The authors wish to thank Tehran University of Medical Sciences, International campus, National Institute for Medical Research Development, Grant No. 963445, and Nanotechnology Research Centre for the financial and instrumental support of this research.

Electronic Supplementary Material

Supplementary material is available in the online version of this article at https://doi.org/10.1007/s11705-019-1808-1 and is accessible for authorized users.

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