Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 208, Issue -, Pages 15-21Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mseb.2016.02.004
Keywords
ZnS; Homogeneous precipitation; pH; Photoactivity
Funding
- National Natural Science Foundation of China [51541204]
- Natural Science Foundation of Education Department of Shaanxi Provincial Goverment [15JK1106]
- Scientific and Technological Projects of Science and Technology Bureau of Xianyang City [2013JK02-11]
- Doctoral Starting up Foundation of Shaanxi University of Science Technology [BJ12-12]
- National College Students Innovation and Entrepreneurship Training Program [201510708154]
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Size-controlled ZnS nanostructures have been synthesized successfully with different reaction pH via a facile homogeneous precipitation method. These samples were characterized by X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), N-2-sorption BET surface area, Raman spectra and UV-vis spectroscopy for their structures, morphologies, specific surface area and band gaps values (E-g). Results show that the size of the prepared nanospheres can be controllably tuned by adjusting pH value. Moreover, the size-related mechanism of different samples was also discussed. The degradation of methyl orange (MO) under UV light irradiation was carried out to study the effects of the size on the photo catalytic activity of the prepared samples. It was found that the sample obtained at pH = 7 exhibited the higher photocatalytic activity, which degradation efficiency reaches 99.5% under UV irradiation for 30 min. The big specific surface area of ZnS nanostructures are believed to greatly affect the final degradation efficiency of MO in our research. Moreover, the mechanism of enhanced photocatalytic activity was also investigated and the center dot O2- plays a dominant role during degradation process. (C) 2016 Elsevier B.V. All rights reserved.
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