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 s...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(H_(2)O_(2)).The results indicate that the yolk-shelled microspheres display excellent photocatalytic activity and recycling stability.The photocatalytic degradation rate of yolk-shelled MoS_(2)microspheres is 97.6%after only 30 min,which is much higher than those of MoS_(2)particles synthesized without P123,MoS_(2)solid microspheres and commercial MoS_(2)(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 MoS_(2)particles(k_(2)=7.51×10^(-2)),MoS_(2)solid microspheres(k_(3)=1.28×10^(-3))and commercial MoS_(2)(k_(4)=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 MoS_(2)particles,MoS_(2)solid microspheres and commercial MoS_(2)to provide a more efficient way of enhancing light-harvesting efficiency.展开更多
基金Natural Science Foundation of Anhui Province(1708085ME96)National Natural Science Foundation of China(51571166 and 61505167)+2 种基金Key Natural Science Research Project for Colleges and Universities of Anhui Province(KJ2016A638 and KJ2018B06)Basic Research Fund for Free Exploration(JCYJ20170815161437298 and 20170806223012689)foundation of the Anhui Provincial Education Department for Outstanding Young Talents in University(gxyq2017155)。
文摘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(H_(2)O_(2)).The results indicate that the yolk-shelled microspheres display excellent photocatalytic activity and recycling stability.The photocatalytic degradation rate of yolk-shelled MoS_(2)microspheres is 97.6%after only 30 min,which is much higher than those of MoS_(2)particles synthesized without P123,MoS_(2)solid microspheres and commercial MoS_(2)(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 MoS_(2)particles(k_(2)=7.51×10^(-2)),MoS_(2)solid microspheres(k_(3)=1.28×10^(-3))and commercial MoS_(2)(k_(4)=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 MoS_(2)particles,MoS_(2)solid microspheres and commercial MoS_(2)to provide a more efficient way of enhancing light-harvesting efficiency.
