8. XRD patterns at different temperature
• The products
maintained as
crystalline melamine
phase when the heating
temperature is lower
than 300C.
• when the temperature
rises to 350–400C, it is
transformed into
crystalline or
amorphous graphite
like carbon nitride
compounds
• the temperature is
higher than 500C, the
products completely
forms into amorphous
g-C3N4.
9. UV/visible spectra of g-C3N4
The UV-visible
diffuse reflectance
spectra showed that
the absorption edges
of samples is close to
468 nm.
10. SEM analysis
The morphology of melamine
processed at 300C is
granular with a particle size of
50–80 nm.
The processed temperature is
higher than 400C, the
morphology of products have
transformed into layer.
Flake size : 0.5–0.8 mm
SEM images at (b) 400CSEM images at (a) 300C
11. SEM images at (d) 600C .SEM images at (c) 500C
The processed temperature
rises to 500C . the size is
also increased to 0.5–1.0
mm
The processed temperature
rises to 600C size is also
increased to 0.5–1.5 mm
12. HR-TEM, images of g-C3N4 at
600C for 2 h.
TEM analysis
Layer like structure
No crystal fring is observed so
amorphous in structure
TEM, images of g-C3N4 at 600C for 2 h.
