In this paper, three carbon sources, i.e., solid graphite, gaseous CH4 and liquid ethanol, and one solid silicon source were employed to synthesize SiC/C nanocomposite powders by arc-discharge plasma. The processing conditions such as the component ratios of raw materials, atmospheric gases, etc. we...
In this paper, three carbon sources, i.e., solid graphite, gaseous CH4 and liquid ethanol, and one solid silicon source were employed to synthesize SiC/C nanocomposite powders by arc-discharge plasma. The processing conditions such as the component ratios of raw materials, atmospheric gases, etc. were adjusted for controllable synthesis of the nanopowders. It is indicated that both of solid graphite and silicon can be co-evaporated and reacted to form nanophases of cubic ${\beta}$-SiC with ~50 nm in mean size and a little free graphite; the carbon atoms decomposed from gaseous $CH_4$ favor to combine with the evaporated silicon atoms to form the dominant SiC nanophase; liquid carbon source of ethanol can also be used to harvest the main ${\beta}$-SiC and minor 6H-SiC phases in the assembly of nanoparticles. The as-prepared SiC/C nanocomposite powders were further purified by a heat-treatment in air and their photocatalytic performances were then greatly improved.
In this paper, three carbon sources, i.e., solid graphite, gaseous CH4 and liquid ethanol, and one solid silicon source were employed to synthesize SiC/C nanocomposite powders by arc-discharge plasma. The processing conditions such as the component ratios of raw materials, atmospheric gases, etc. were adjusted for controllable synthesis of the nanopowders. It is indicated that both of solid graphite and silicon can be co-evaporated and reacted to form nanophases of cubic ${\beta}$-SiC with ~50 nm in mean size and a little free graphite; the carbon atoms decomposed from gaseous $CH_4$ favor to combine with the evaporated silicon atoms to form the dominant SiC nanophase; liquid carbon source of ethanol can also be used to harvest the main ${\beta}$-SiC and minor 6H-SiC phases in the assembly of nanoparticles. The as-prepared SiC/C nanocomposite powders were further purified by a heat-treatment in air and their photocatalytic performances were then greatly improved.
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제안 방법
Thus the photocatalytic performances of SiC/C nanocomposites can be controlled and improved. Four kinds of SiC/C nanocomposite nanopowders, i.e., asprepared samples S2, G1, SG1 and L1, and their heat-treated ones were chosen to measure the photodegradation abilities on MB. As shown in Fig.
, 2009). The structures, compositions and morphologies of these nanocomposites were analyzed by means of X-ray diffraction (XRD) and scanning electron microscope (SEM). The photocatalytic degradation of methylene blue (MB) by such SiC/C nancomposite powders were also examined.
성능/효과
They used the bulk SiC as raw material to produce SiC nanoparticles under the ambient atmosphere of hydrogen and inert gases with different ratios. It was found that the photocatalytic performance of SiC nanoparticles is comparably excellent as Pt/TiO2 in the produced capacity of hydrogen, in which the productions were exposed to the ultraviolet irradiation in wavelength range of 210 to 460 nm.
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