Treatment of discarded oil in supercritical carbon dioxide for preparation of carbon microspheres |
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Authors: | Binxing Yu Xiangkai Kong Lingzhi Wei Qianwang Chen |
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Institution: | (1) Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026, China;(2) Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China; |
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Abstract: | Carbon microspheres with diameter of 1–10 μm were prepared by treatment of waste oil in a supercritical carbon dioxide (scCO2) system. The structure and morphology of the products were characterized by X-ray diffraction, field-emission scanning electron
microscopy, and Raman spectrometry. It is shown that the products consist of graphite microspheres with relatively low graphitization.
The yield of solid products increased from 26.8 wt% to 42.2 wt% as the reaction temperature was raised from 530°C to 600°C.
Spheres with multilayer structure could be obtained by means of subsequent vacuum annealing of the carbon microspheres at
1500°C. The formation mechanisms of carbon microspheres in the scCO2 system and the influence of vacuum annealing on the structure are discussed in detail. |
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