  The copolymerization of melamine with 2,4,6-triaminopyrimidine (TAP) in an
electrochemical induced polymerization process leads to the formation of
molecular doped poly (triazine imide) (PTI). The polymerization is based on the
electrolysis of water and evolving radicals during this process. The
incorporation of TAP is shown by techniques such as elemental analysis, FTIR
and NMR spectroscopy and powder x-ray diffraction (XRD), and it is shown that
the carbon content can be tuned by the variation of the molar ratio of the two
precursors. This incorporation of TAP directly influences the electronic
structure of PTI and as a result a red-shift can be observed in UV-Vis
spectroscopy. The smaller bandgap and the increased absorption in the visible
range lead to improved photocatalytic properties. In dye degradation
experiments it was possible to observe an increase of the rate of the
degradation of methylene blue (MB) by a factor of 4 in comparison to undoped
PTI or 7 if compared to melon.
