Enhancing visible-light-driven NO oxidation through molecular‐level insights of dye-loaded sea sands

Yu-Han LI, Bang-Fu CHEN, Sónia A. C. CARABINEIRO, You-Yu DUAN, Ping TAN, Wing Kei HO, Fan DONG

Research output: Contribution to journalArticlespeer-review

Abstract

Natural minerals, abundant and easily obtained through simple physical processing, offer a cost-effective and environmentally friendly solution for dyeing wastewater disposal and air pollution treatment. This study investigates the photocatalytic removal of NO using natural different types of dyes, loaded on natural sand, under visible light illumination. By examining various coating concentrations of dyes and sand weights, we discovered that sand loaded with Rhodamine B (RhB) exhibits high activity for the photo-oxidation of NO. A combination results of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric (TG) analyses confirm the presence of SiO₂, CaCO₃, Al₂O₃ and iron oxides as the main components of the sand. Furthermore, studying RhB-loaded individual components reveals that CaCO₃ plays a crucial role in enhancing the NO removal rate. Experimental results and theoretical calculations demonstrate the establishment of a directional charge transfer channel from CaCO₃ to RhB, facilitating the adsorption and activation of molecular NO and O₂. This work not only promotes the utilization of natural mineral resources but also enriches the fields of environmental photochemistry and semiconductor photocatalysis. Copyright © 2023 Youke Publishing Co.,Ltd.
Original languageEnglish
Pages (from-to)543-554
JournalRare Metals
Volume43
Early online dateNov 2023
DOIs
Publication statusPublished - Feb 2024

Citation

Li, Y.-H., Chen, B.-F., Carabineiro, S. A. C., Duan, Y.-Y., Tan, P., Ho, W.-K., & Dong, F. (2024). Enhancing visible-light-driven NO oxidation through molecular‐level insights of dye-loaded sea sands. Rare Metals, 43, 543-554. https://doi.org/10.1007/s12598-023-02475-x

Keywords

  • Sand
  • Dyes
  • Rhodamine B
  • Photo-oxidation of NO
  • Visible light illumination

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