Previous investigations from Ang and chan obtained the g-C3N4 obtained by heating thiourea at 400 °C using TiO2 or SiO2 as the substrate and reported the moderate catalytic performance which was due to the partial generation of electronic band and lesser degree of polymerisation . To overcome this issue, Zhang et al. explored the synthesis of g-C3N4 via direct heating of thiourea at variety of temperatures without involvement of inorganic substrates . The preparation of g-C3N4 via pyrolysis of thiourea and urea is schematically presented in Fig. .