期刊
JOURNAL OF MATERIALS SCIENCE
卷 52, 期 10, 页码 5626-5633出版社
SPRINGER
DOI: 10.1007/s10853-017-0797-z
关键词
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资金
- Major Project of Education Department in Sichan Province [15ZA0286]
- Startup Fund for Distinguished Scholars of Neijiang Normal University [14B03]
- Key Lab of Process Analysis and Control of Sichuan Universities (Major Project) [2015002]
- Major Project of Science & Technology Department in Sichan Province [2016JY0168]
- New Teachers' Fund for Doctor Stations, Ministry of Education [20120184120024]
- National Magnetic Confinement Fusion Science Programme [2011GB112001]
We report a simple solution-based method to synthesize phase- and size-controllable ZnS nanoparticles at low temperature. Cubic ZnS (c-ZnS) and hexagonal ZnS nanoparticles (h-ZnS) were obtained by heating an aqueous solution of Zn(NO3)(2)center dot 6H(2)O and Na2S2O3 center dot 5H(2)O at different temperatures. When the system was heated at 65 A degrees C for 24 h, hexagonal crystal structure of ZnS nanoparticles, with size of 50-350 nm, was obtained, as confirmed by X-ray diffraction and selected-area electron diffraction. When the reaction temperature was 100 A degrees C under hydrothermal condition, c-ZnS nanoparticles were obtained and exhibited monodisperse nanoparticles with average size of 4 nm. Proper rate of S releasing tuned by the variation of pH value is believed to be critical to stabilize the hexagonal ZnS nanoparticles. Compared with large size of h-ZnS nanoparticles, c-ZnS nanoparticles show higher photocatalytic activity in degrading methyl orange (MO). The degradation efficiency of c-ZnS nanoparticles reaches 97% under UV irradiation for 120 min. The good ultraviolet absorbing ability, charge separation property, and large surface area of c-ZnS nanoparticles are believed to have a positive impact on improving the degradation rate and degradation efficiency of MO.
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