Graphitic carbon nitride (g-C3N4) was prepared by heating melamine and then its specific surface area was enlarged by hydrothermal treatment in aqueous sodium hydroxide solution. The g-C3N4 samples were blended with tungsten(VI) oxide (WO3) using a planetary mill in order to improve photocatalytic activity. The composite photocatalyst with optimized amounts of these contents showed higher photocatalytic activity for decomposition of acetaldehyde under visible-light irradiation than did original samples. From the results, we concluded that the composite photocatalyst utilizes both high oxidation ability of WO3 and high reduction ability of g-C3N4 by Z-scheme charge transfer.
Uniform-sized and monodiperse cerium dioxide porous hollow spheres (CeO2-PH) based on the Ostwald ripening process were fabricated by a simple solvothermal method in the absence of any templates.
Hydrogen
production by water splitting and the removal of aqueous
dyes by using a catalyst and solar energy are an ideal future energy
source and useful for environmental protection. Graphitic carbon nitride
can be used as the photocatalyst with visible light irradiation. However,
it typically suffers from the high recombination of carriers and low
electrical conductivity. Here, we have developed a facile mix-thermal
strategy to prepare carbon black-modified graphitic carbon nitrides,
which possess high electrical conductivity, a wide adsorption range
of visible light, and a low recombination rate of carriers. With the
help of carbon black, highly crystallized graphitic carbon nitrides
with built-in triazine and heptazine heterojunctions are obtained.
Improved photocatalytic activities have been achieved in carbon black-modified
graphitic carbon nitride. The dye removal rate can be three times
faster than that of pristine graphitic carbon nitride and the photocatalytic
H
2
generation is 234 μmol h
–1
g
–1
under visible light irradiation.
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