Nanostructured TiO2 sensitized with MoS2 nanoflowers for enhanced photodegradation efficiency toward methyl orange

Kite, Sagar V. and Kadam, Abhijit Nanaso and Sathe, Dattatraya J. and Patil, Satish and Mali, Sawanta S. and Hong, Chang Kook and Lee, Sang-Wha and Garadkar, Kalyanrao M. (2021) Nanostructured TiO2 sensitized with MoS2 nanoflowers for enhanced photodegradation efficiency toward methyl orange. ACS Omega, 6 (26). pp. 17071-17085. ISSN 2470-1343 (https://doi.org/10.1021/acsomega.1c02194)

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Abstract

Nanostructured titanium dioxide (TiO2) has a potential platform for the removal of organic contaminants, but it has some limitations. To overcome these limitations, we devised a promising strategy in the present work, the heterostructures of TiO2 sensitized by molybdenum disulfide (MoS2) nanoflowers synthesized by the mechanochemical route and utilized as an efficient photocatalyst for methyl orange (MO) degradation. The surface of TiO2 sensitized by MoS2 was comprehensively characterized by X-ray diffraction (XRD), Raman spectroscopy, Fourier transform-infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), energy dispersive spectroscopy (EDS), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), photoluminescence spectroscopy (PL), Brunauer-Emmett-Teller (BET) surface area, and thermogravimetric analysis (TGA). From XRD results, the optimized MoS2-TiO2 (5.0 wt %) nanocomposite showcases the lowest crystallite size of 14.79 nm than pristine TiO2 (20 nm). The FT-IR and XPS analyses of the MoS2-TiO2 nanocomposite exhibit the strong interaction between MoS2 and TiO2. The photocatalytic results show that sensitization of TiO2 by MoS2 drastically enhanced the photocatalytic activity of pristine TiO2. According to the obtained results, the optimal amount of MoS2 loading was assumed to be 5.0 wt %, which exhibited a 21% increment of MO photodegradation efficiency compared to pristine TiO2 under UV-vis light. The outline of the overall study describes the superior photocatalytic performance of 5.0 wt % MoS2-TiO2 nanocomposite which is ascribed to the delayed recombination by efficient charge transfer, high surface area, and elevated surface oxygen vacancies. The context of the obtained results designates that the sensitization of TiO2 with MoS2 is a very efficient nanomaterial for photocatalytic applications.

ORCID iDs

Kite, Sagar V., Kadam, Abhijit Nanaso, Sathe, Dattatraya J., Patil, Satish, Mali, Sawanta S. ORCID logoORCID: https://orcid.org/0000-0002-4973-4203, Hong, Chang Kook, Lee, Sang-Wha and Garadkar, Kalyanrao M.;
  • Item type:Article
    ID code:90020
    Dates:
    Date
    Event
    6 July 2021
    Published
    23 June 2021
    Published Online
    15 June 2021
    Accepted
    Subjects:Science > Chemistry
    Department:Faculty of Science > Pure and Applied Chemistry
    Depositing user: Pure Administrator
    Date deposited:24 Jul 2024 13:03
    Last modified:17 Nov 2024 03:56
    URI:https://strathprints.strath.ac.uk/id/eprint/90020
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