In-situ preparation of ultrafine silicon carbide (SiC) powders had been successfully achieved in the Potassium Chloride (KCl) and Sodium Chloride (NaCl) molten salt system. The results showed that the optimized preparation conditions for SiC in the air were: a reaction temperature of 1400℃, a carbon-silicon ratio of 1:7, and a molten salt ratio of 1:4. The optimal temperature for synthesizing SiC in a vacuum was 1300℃. Notably, SiC synthesized at 1300℃ in a vacuum had a smaller particle size and a more uniform distribution compared to SiC prepared in air. This study successfully prepared ultrafine SiC powders using the molten salt method and underscored the significance of vacuum conditions in optimizing SiC performance and particle size distribution.
Graphite-like carbon nitride (g-C3N4) is an attractive photocatalyst, but its weak photo-generated carrier transport ability severely limits its application in photocatalysis. However, g-C3N4-based heterostructure photocatalysts have been widely investigated for their significantly enhanced photo generated electron-hole separation efficiency. In this paper, g-C3N4 was firstly prepared by thermal polycondensation with urea as raw material, and then the Bi2WO6/g-C3N4 heterostructure photocatalyst was prepared by hydrothermal method. The photocatalytic degradation of methyl orange by Bi2WO6 andg-C3N4 before and after composite under simulated solar radiation was studied. The results showed that the composite modification of g-C3N4 by Bi2WO6 was achieved by the hydrothermal method, and the photocatalytic performance of the heterogeneous structure photocatalyst was significantly improved compared with that of the non-composite monomer photocatalyst. The photocatalytic performance of the produced heterostructure photocatalyst is the greatest among them when the mass ratio of Bi2WO6 to g-C3N4 is 10:1, and the degree of methyl orange degradation reaches 90.37%after 4hof radiation.
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