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Facile Synthesis of Monodispersed Yolk-Shelled Molybdenum Disulfide Microspheres with Enhanced Photocatalytic Properties

Abstract

Controllable preparation and development of a practical photocatalytic material with yolk-shelled structure remain a great challenge. Herein, the monodispersed yolk-shelled molybdenum disulfide microspheres have been synthesized via a facile and economical hydrothermal method with the assistance of surfactant (polyethylene-polypropylene glycol (P123)). Ostwald ripening is the main formation mechanism for the yolk-shelled structure. The photocatalytic activity of the sample is evaluated by monitoring the photodegradation of rhodamine B (RhB) under white light illumination (500 W xenon lamp) with the assistance of hydrogen peroxide (H2O2). Results indicated that the yolk-shelled microspheres display excellent photocatalytic activity and recycling stability. The photocatalytic degradation rate of yolk-shelled MoS2 microspheres achieved 97.6% at only 30 min, which is much higher than those of MoS2 particles synthesized without P123, MoS2 solid microspheres, and commercial MoS2 (see Experimental Section) (54.7 % , 4.6 % and 9.6 % at 30 min, respectively). The reaction rate constant (k) of the yolk-shelled microspheres for the photodegradation of RhB is 1.19×10-1 min-1, which is 1.58, 92.97 and 107.21 times faster than that of MoS2 particles (k2 = 7.51×10-2), MoS2 solid microspheres (k3 = 1.28×10-3) and commercial MoS2 (k4 = 1.11×10-3). Such a highly desired yolk-shelled structure enables higher multiple light reflections and scattering between the outer spherical shell and the interior core compared with MoS2 particles, MoS2 solid microspheres and commercial MoS2, to provide a more efficient way in enhancing light-harvesting efficiency.

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Publication details

The article was received on 20 Aug 2018, accepted on 26 Sep 2018 and first published on 27 Sep 2018


Article type: Research Article
DOI: 10.1039/C8QI00878G
Citation: Inorg. Chem. Front., 2018, Accepted Manuscript
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    Facile Synthesis of Monodispersed Yolk-Shelled Molybdenum Disulfide Microspheres with Enhanced Photocatalytic Properties

    Y. Zhang, Y. Zhao, J. Li, L. Li, Y. Liu, D. Ma, D. li and X. Li, Inorg. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QI00878G

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