Synthesis and characterisation of Li-modified g-C3N4

Photocatalytic performance of alkali metal doped graphitic carbon nitrides and Pd-alkali metal doped graphitic carbon nitride composites

“…However, the introduction of Li (line d in Figure 1) dopant decreased the absorbance and shifted the band edge to the UV range. The latter finding is in good agreement with the recent results in work by Jasni et al [57].…”

“…The splitting of the band around 1620 cm -1 and the significant shift in the wavenumbers of C-N and C=N related stretching bands were observed. In agreement with Jasni et al [57], we suggested that the structure of g-C3N4 may be altered. Indeed, the bands at 1223 and 1195 cm -1 might belong to out-of-plane bending of the heptazine ring, which suggests that the planarity of the g-C3N4 sheets might have been altered.…”

“…As seen in Table 1, Li doping increased the band gap, which confirms the results reported by Jasni et al [57], while Na and K doping decreased that compared to the undoped g-C3N4 in line with literature data [24,33,36] Based on the results of XRD, HR-TEM, FT-IR, TGA, PL measurements, Jasni and et al [57] concluded that Li atoms substitute the H atoms of the amino They assumed that the presence of Li + ions might lead to the formation of g-C3N4 with a small polymerization degree and more defect sites. They concluded from the data of UV-Vis analysis that Li + doping reduced the visible light sensitivity of the Li/g-C3N4 nanocomposites compared to g-C3N4 due to the distortion of the g-C3N4 planar structure.…”

“…Jasni et al characterized Li-modified g-C3N4 and revealed the substitution of H atoms of the amino groups by Li atoms [57]. They presumed that the presence of Li + ions enhanced the defect sites which in turn implies the distortion of the g-C3N4 planar structure.…”