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Fabrication of dandelion clock-inspired preparation of core-shell TiO2@MoS2 composites for unprecedented high visible light-driven photocatalytic performance

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Abstract

Phase junction construction and surface modification are two practical engineering strategies toward efficient photocatalysis. In the present work, core-shell TiO2@MoS2 heterojunction composites were directly constructed via one-step hydrothermal method. The prepared catalysts are characterized by X-ray diffraction, Raman spectroscopy, Scanning electron microscopy, Transmission electron microscopy, and N2 adsorption–desorption studies to know the structural, morphological, and textural properties. The optical absorption and prevention of electron–hole recombination process was studied by UV–Vis diffuse reflectance spectra (DRS) and photoluminescence analysis. The photocatalytic degradation experiment was carried out using methyl orange (MO) and 4-nitrophenol (4-NP) for all the catalysts under visible light irradiation. The results reveal that MoS2@TiO2 heterojunction catalyst shows excellent photocatalytic activity toward 4-NP such as high removal efficiency (96%), high apparent constant (0.0242 min−1), and long-term stability. The enhancement in the photodegradation is due to dandelion clock heterostructures of MoS2@TiO2 possess high specific surface area (103.5 m2/g), specific pores (11.8 nm). The photoelectrochemical results suggest that MoS2@TiO2 catalyst exhibits the high photoresponse than compared with pure MoS2 and TiO2 catalysts, respectively.

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Authors and Affiliations

  1. PG and Research Department of Physics, Government Arts College (Autonomous) (Affiliated to Bharathidasan University), Karur, 639005, Tamilnadu, India

    G. Mahalakshmi, M. Rajeswari & P. Ponnarasi

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  1. G. Mahalakshmi
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Mahalakshmi, G., Rajeswari, M. & Ponnarasi, P. Fabrication of dandelion clock-inspired preparation of core-shell TiO2@MoS2 composites for unprecedented high visible light-driven photocatalytic performance. J Mater Sci: Mater Electron 31, 22252–22264 (2020). https://doi.org/10.1007/s10854-020-04726-4

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