Phase- and size-controllable synthesis with efficient photocatalytic activity of ZnS nanoparticles |
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Authors: | Feng Huo Yushu Wang Chao You Wenqing Deng Feng Yang Yuan Pu |
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Affiliation: | 1.School of Chemistry and Chemical Engineering, Analytical Testing Center,Neijiang Normal University,Neijiang,People’s Republic of China;2.School of Chemistry and Materials Science,Sichuan Normal University,Chengdu,People’s Republic of China;3.School of Materials Science and Engineering,Georgia Institute of Technology,Atlanta,USA;4.Superconductivity and New Energy R&D Center, Key Laboratory of Advanced Technology of Materials (Ministry of Education of China),Southwest Jiaotong University,Chengdu,People’s Republic of China;5.State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing,People’s Republic of China |
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Abstract: | 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)2·6H2O and Na2S2O3·5H2O at different temperatures. When the system was heated at 65 °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 °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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