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Facile synthesis of monodispersed yolk-shelled molybdenum disulfide microspheres with enhanced photocatalytic properties

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Abstract

The controllable preparation and development of a practical photocatalytic material with yolk-shelled structure remains a great challenge. Herein, monodispersed yolk-shelled molybdenum disulfide microspheres have been synthesized via a facile and economical hydrothermal method with the assistance of a 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). The results indicate that the yolk-shelled microspheres display excellent photocatalytic activity and recycling stability. The photocatalytic degradation rate of yolk-shelled MoS2 microspheres is 97.6% after only 30 min, which is much higher than those of MoS2 particles synthesized without P123, MoS2 solid microspheres and commercial MoS2 (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 those of MoS2 particles (k2 = 7.51 × 10−2), MoS2 solid microspheres (k3 = 1.28 × 10−3) and commercial MoS2 (k4 = 1.11 × 10−3), respectively. 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 of enhancing light-harvesting efficiency.

Graphical abstract: Facile synthesis of monodispersed yolk-shelled molybdenum disulfide microspheres with enhanced photocatalytic properties

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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, Advance Article
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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, Advance Article , DOI: 10.1039/C8QI00878G

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